TYPE: B6TS-08LF TOUCH-SENSING IC USER MANUAL
Contents
1. SETUP pin MEAS pin Operation mode HIGH HIGH Normal measurement mode HIGH LOW Standby without executing measurements LOW HIGH Teaching mode LOW LOW Setup mode Setup mode Standby status SETUP pin HIGH MEAS pin LOW a SETUP pin LOW Pr SETUP pin HIGH MEAS pin LOW SETUP pin HIGH MEAS pin HIGH MEAS pin HIGH Normal measurement mode Serial communication output 3 wire SPI On Off output SETUP pin HIGH MEAS pin HIGH Figure 4 State transition diagram 10 3713050 2A Ver 080123 4 Measurement The chip measures the discharge of the charge stored in the charge capacitor When a finger is placed close to the touch electrode the electrostatic capacitance of the electrode increases and the discharge time for the charge becomes shorter The chip has a built in counter to measure the discharge period Whether the sensor has been touched or not is judged according to whether the length of the discharge period exceeds a specified value or not Hereafter the length of the discharge period is referred to as the measured value The measured value when the sensor is not touched is called the reference value The change of the measured value which allows a judgment that the sensor is touched is called judging change and the change of the measured value when returning from on status is called hysteresis These 3 parameters define the switching characteristics of each touch chann2. Temperature humidity 65 150 C 80 or less RH Term of validity One year When the sensor is used after a long period of storage make sure that no damage dirt or rust is present on the pack B After opening the moisture proof pack aluminum laminate pack Until the package is mounted the following conditions are recommended for storage of the package In accordance with MSL3 JEDEC STD 020 Temperature humidity 30 C 60 RH Term of validity 168 hours C Temporary storage after opening the moisture proof pack After opening the moisture proof pack it is recommended to store any parts remaining in the same package after mounting due to your manufacturing quantity reason in a desiccator device to keep temperature constant and humidity as low as 20 or less RH or return them into the moisture proof pack then seal the pack immediately after using them Do not use or store the touch sensor where it will be subject to corrosive gases such as hydrosulfuric gas or salt air or exposed to oil or direct sunlight 4 Do not use or store the touch sensor where it will be subject to corrosive gases such as hydrosulfuric gas or salt air or exposed to oil or direct sunlight 5 Where either of the following conditions 1 or 2 is applicable baking the sensor package in the following manner is recommended in order to remove moisture The tray used in the moisture proof pack can be stored in a high temperature chamber because it is
3. 0 C REFx only o OE all Pole BPOL Low Activ x Low Activ x Low Activ x Low Activ y Reference value REFx s00f af af 300 Drift correction interval DOD Judging change THR zaf 30 5 45 32 Times Hysteresis HYSx Max successive ON count MSA On judging ratio RTHRx roe 0 Times Hysteresis ratio RHYSx On Off threshold Teaching measurement count TCAL EEE 512 Times channel een Patrol low Rov low Rtv low Aa low Aa 9 Times Reference value REFx 300 300 300 300 ON gt OFF Judging chanel THR Sof za f p 3 Times Hysteresis HYSx 5 5 5 5 On judging ratio RTH Gl af af 9g pa ica Hysteresis ratio RHYSx Tf T zzz o il On Off threshold 270 270 Figure 8 Default parameters in the EEPROM 23 3713050 2A Ver 080123 7 Teaching 7 1 Outline of teaching Such parameters as the quantity of judging change can be set automatically through actual touches on the electrode This operation is called Teaching When teaching the reference value REFx quantity of judging change THRx and hysteresis HYSx are updated appropriately and stored in the EEPROM built into the chip Before performing a teaching operation some preparation is required The processing flow is as follows 7 2 During teaching serial communication is not available However checking the CHG pin allows status to be checked Once teaching mode is e
4. 0x52 RTHR3 Ch3 On judgment ratio R W O Used in teaching 0x53 RHYS3 Ch3 hysteresis ratio R W O Used in teaching 0x54 REF4 Ch4 reference value R W O 0x55 THR4 Ch4 judging change R W O 0x56 HYS4 Ch4 hysteresis R W O 0x57 RTHR4 Ch4 On judgment ratio R W Used in teaching 0x58 RHYS4 Ch4 hysteresis ratio R W O Used in teaching 0x59 REF5 Ch5 reference value R W O Ox5A THR5 Ch5 judging change R W O 0x5B I HYS5 Ch5 hysteresis R W O 0x5C I RTHR5 Ch5 On judgment ratio R W O Used in teaching 0x5D RHYS5 Ch5 hysteresis ratio R W Used in teaching 0ox5E REF6 Ch6 reference value R W O Ox5F THR6 Ch6 judging change R W O 0x60 HYS6 Ch6 hysteresis R W O 0x61 RTHR6 Ch6 On judgment ratio R W O Used in teaching 0x62 RHYS6 Ch6 hysteresis ratio R W Used in teaching 0x63 REF7 Ch7 reference value R W O 0x64 THR7 Ch7 judging change R W O 0x65 HYS7 Ch7 hysteresis R W O 0x66 RTHR7 Ch7 On judgment ratio R W O Used in teaching 0x67 RHYS7 Ch7 hysteresis ratio R W Used in teaching 0x68 f System reservation 0x7F 16 3713050 2A Ver 080123 6 2 Description of commands 6 2 1 ID Chip ID read only Used as ID of the chip The data is fixed to 0x0281 Command code 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Aaa 6 2 2 BDATA Detection result of touch no touch for each channel read only Measurement result for each channel is indicated by 1 0 1 Off no touch 0 On touch Command code 15 14 13 12 11 10
5. 3 9kQ Rr0 7 10k0 Vdd 5VTopr 20 C 600 800 z 700 i 500 E E qa q 500 R27 el u Be 5m RB 5 30 ine Re nee 300 RE 200 Siar 200 100 100 0 0 o 2 4 6 8 0 2 4 6 8 SxopF OcpF measurement time temperature characteristic CHO Cc 0 1uF CrO 15pF Cr1 15pF Cr2 15pF Cr3 22pF Cr4 18pF Cr5 22pF Cc 0 14F CrO 5pF Cr1 15pF Cr2 15pF Cr3 22pF Cr4 18pF Cr5 22pF Cr6 22pF Cr722pF RrO 7 10k0 Vdd 5V Topr 20 C Cr6 22pF Cr722pF Rc0 33 RrQ 7 10KQ Vdd 5V 350 300 3 E 3 3 3 Rc 2 7kQ 3 en ROO z a Rc 5 6kQ Si RE 50 30 10 10 30 50 70 90 temperature Q anea yaua nsn Supply voltage characteristic CHO 0 Cc O 1uF CrO 15pF Cr1 15pF Cr2 15pF Cr3 22pF Cr4 18pF Cr5 22pF Cr6 22pF Cr722pF RcO 33 XQ Rr0 7 10kQ Topr 20 C 100 2 3 4 5 6 Supply Voltage V 3713050 2A Ver 080123 9 Appearance and dimensions 1 Li I BE BER EEE ER BE a 5 en EX E gt 7 4 co O E H Nass m Le ja DO ee ES 2 f LO te lt y 249 5 3 eS t age JOE J J ee MOO THA 1 MIN m y Hero AABT o 2 ta Recommended pad dimensions Figure 12 Appearance and dimensions
6. 30 100 msec for one teaching measurement depending on external circuit constants and if this parameter is set to 10 the touches must be executed within 10 30 seconds Unless each electrode is touched three times within the number of teaching measurements after starting teaching the teaching is regarded as faulty and none of the parameters are updated However when this parameter is set to 0 only the reference value REFx is updated In this case no touching is required and the teaching is not regarded as faulty even if no touches are executed 7 2 2 _ On judgment ratio refer to 6 2 15 THRx On judgment ratio for each channel This parameter contains the quantity of variation of the measured value that will allow judgment of a touch approximate value To distinguish between variation of the measured value caused by a noise or the like and variation caused by touching during teaching this parameter must be set to an approximate value If variation of half of this set value occurs during teaching the electrode is judged touched Therefore an approximate value for variation likely to have been caused by touch may be entered 7 2 3 Hysteresis ratio Refer to 6 2 16 HYSx Hysteresis ratio for each channel This parameter sets the hysteresis value in teaching approximate value 7 2 4 On judgment ratio Refer to 6 2 17 RTHRx On judgment ratio for each channel and Hysteresis ratio Refer to 6 2 17 RHYSx Hysteresis rati
7. 4 Checking the result of teaching When teaching finishes correctly bit14 TER bit of the data which can be read with the MODE command changes to 1 If teaching is not completed normally because the specified number of touches are not executed within the teaching measurement time or for some other reason the TER bit changes to 0 and the quantity of judging change THRx and hysteresis HYSx are not updated In this event only the reference value REFx is updated To reset the TER bit set it to 1 using the MODE command or perform teaching again and finish the teaching operation normally 26 3713050 2A Ver 080123 8 Electrical characteristics 8 1 Absolute maximum ratings Desig Item Condition Rated value Unit nation Vaad Supply voltage 0 3 6 5 V Vi Input voltage 0 3 Vag 0 3 V Vo Output voltage 0 3 Vag 0 3 V Pa Power dissipation Topr 25 C 500 mW Ambient operating BAe 3 Topr temperature eve Be C Tstg Storage temperature 65 150 C 82 Recommended operating conditions Note 1 Unless otherwise specified Vag 3 0 5 5V Topr 20 85 C Desig u Rated value nation Item Condition Minimum Standard Maximum Unit Vad Supply voltage 3 0 5 5 V Vin High input voltage 0 8V aa Vad V Vit Low input voltage 0 0 2Vad V loH High output current 40 mA loL Low output current 40 mA 8 3 Electrical character
8. O m compensationiis 0x26 System reservation 0x35 0x36 MSA Max successive On count R W O 0x37 DCI Drift compensation interval R W O 0x38 BPOL On Off output polarity select R W O 0x39 CHEN Channel measurement enable R W O 0x3A TCAL Teaching count number R W O 0x3B TOG Toggle action R W O 0x3C ACD Judging count R W O 0x3D SLP Sleep time R W O Ox3E MODE Operation mode R W O 0x3F ROMSTR EEPROM write R W O _ Writing into ROM with dummy write 0x40 REFO Cho reference value R W O 0x41 THRO ChO judging change R W O 0x42 HYSO ChO hysteresis R W O 0x43 RTHRO Ch0 On judgment ratio R W O Used in teaching 0x44 RHYSO Ch0 hysteresis ratio R W O Used in teaching 0x45 REF1 Ch1 reference value R W O 0x46 THR1 Ch1 judging change R W O 0x47 HYS1 Ch1 hysteresis R W O 0x48 RTHR1 Ch1 On judgment ratio R W Used in teaching 0x49 RHYS1 Chi1 hysteresis ratio R W O Used in teaching 0x4A REF2 Ch2 reference value R W O 0x4B THR2 Ch2 judging change R W O 0x4C HYS2 Ch2 hysteresis R W O 0x4D RTHR2 Ch2 On judgment ratio R W O Used in teaching 15 3713050 2A Ver 080123 Access limit NS 2 ation Description 8 Note 58 0 ZE 0x4E RHYS2 Ch2 hysteresis ratio R W O Used in teaching Ox4F REF3 Ch3 reference value R W O 0x50 THR3 Ch3 judging change R W O 0x51 HYS3 Ch3 hysteresis R W O
9. clock is set to high during idling The data is latched at the rising edge of the clock D The data SD is in MSB first format This chip sends receives data using 4 bytes consisting of acommand byte dummy bytes and 2 data bytes Command 1 byte MSB 1 bit is used for the read write flag Dummy data 1 byte 0x00 or 0x80 is set when accessing to commands 0x00 0x7F or 0x80 OxFF respectively Data 2 bytes Read Data direction B6T Host SCK EIER eee ig el MSB 6 4 3 2 1LSB MSB 14 13 12 1110 9 8 7 6 5 4 3 2 1 LSB 3D g Command 7bit Dummy data 8 bits N Data upper 8 bits Data lower 8 bits neta BSTS gt Host Figure 6 In case of Read command Write Data direction Host gt B6T A MSB 6 4 3 2 1LSB ET ICC 3D ei Command 7bit Dummy data 8 bits Data upper 8 bits Data lower 8 bits Host B6T5 Figure 7 In case of Write command If data communication is performed during normal measurement mode the measurement operation stops while the data is communicated Measurement will restart after communication completes when measurement has been interrupted values from the last measurement are read If SCS is disabled while data is being transmitted or received data transmitted or received by B6T up to that moment is lost O of the SD pin toggles according to the data direction Be sure to change the host pin I O according to the SD pin direction 12 3713050 2A Ver 080123 5 2 Com
10. this bit is always 1 TER Teaching error flag Set reset according to result of teaching Is set to 1 when teaching finishes normally If a teaching error occurs this bit is set to 0 This flag is not cleared automatically To clear this flag write 1 to this bit DC Drift compensation Enable disable the drift compensation function 1 Drift compensation is enabled 0 Drift compensation is disabled DCF Drift compensation type Sets the target for drift compensation 0 Only the reference value is corrected The On judgment variation quantity and hysteresis are not corrected 1 All values are compensated default CHG CHG pin function The signal is specified from the CHG pin in normal measurement mode serial communication mode With this pin set to 1 when on off changes in any channel when any channel is touched comes into on state or changes from touch to no touch goes to off state the signal is high When this pin is set to 0 the signal is high every time a measurement finishes 6 2 16 ROMSTR EEPROM write only write is enabled in setup mode When this command is issued by setting the data to 0x5354 all the parameter data are written to the build in EEPROM If the data is different than 0x5354 this command is ignored Until this command is issued the written datais stored in RAM During write to the EEPROM the CHG pin remains low Command code 15 14 13 12 11 10 9 8 7 6 3 4 3 2 1 0 20 3
11. uS b ca Sn communication clock high pulse 0 4 0 6 us eee St communication clock low pulse 0 4 0 6 uS tsuscs SCS setup time to CLK 320 ns thiscs SCS hold time to CLK 320 ns ta so Serial communication output delay time 280 nS tsucs Serial communication input setup time 120 ns thes Serial communication input hold time 120 nS Serial communication byte to byte eo interval 199 uS Serial communication command twcD reception interval 400 us tw CHG CHG pulse width reference Note 2 20 5 mS tsusetup Mode shift delay time Note 3 100 us tmreser Reset pulse width 500 uS tnwon Power on time Note 4 250 ms Note 1 Unless otherwise specified Vaa 5 0V Topr 25 C Note 2 This is the time period when the condition that CHG pulse width is at its minimum in the serial communication mode of normal measurement mode is set CHG pin function is set to output at the end of every measurement CHG bit 0 with MODE command and the sleep time is set to zero SLP command value 0 Note 3 The delay time for the mode shift between normal measurement mode and setup mode Note 4 Reference data When power on Reset function is used 29 8 5 Measurement characteristics typical example 3713050 2A Ver 080123 measurement value CHO Cc 0 14F CrO 15pF Cr1 15pF Cr2 15pF Cr3 22pF Cr 18pF Cr5 22pF Cr6 22pF Cr722pF RrQ 7 10KQ Vdd 5V Topr 20 C measurement value CHO Cc 0 1u F RcOQ 3
12. 0x18 Command code 0x1B Command code 0x1E Command code 0x21 Command code 0x24 6 2 6 CHYSx Current hysteresis for each channel read only Current hysteresis for each channel is indicated by an unsigned 16 bit integer Channel 0 CHYSO Channel 1 CHYS1 Channel 2 CHYS2 Channel 3 CHYS3 Channel 4 CHYS4 Channel 5 CHYS5 Channel 6 CHYS6 Channel 7 CHYS7 Command code 0x10 Command code 0x13 Command code 0x16 Command code 0x19 Command code 0x1C Command code 0x1F Command code 0x22 Command code 0x25 So a Ga a 6 2 7 MSA Max successive On count read write enabled only in setup mode Drift compensation will be effective when On status is successive at MSAx 64 times measurement because of reading that condition as Off status In fact On status will change to Off status after On status is successive at MSAX 64 times Only the lower order 8 bits are valid If the other bits are written to they are ignored Command code 15 14 13 12 11 10 0x36 6 2 8 DCI Drift compensation interval read write enabled only in setup mode Drift compensation is effective every 2 DCI measurement Only the lower order 3 bits are valid If the other bits are written to they are ignored Command code 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 18 3713050 2A Ver 080123 6 2 9 BPOL On Off output pole read write enabled only in setup mode Set the output polarity logic of On Off output signal 1 High Active OUTx terminal is HIGH when t
13. 3713050 2A Ver 080123 OMRON TYPE B6TS 08LF TOUCH SENSING IC USER MANUAL OMRON KURAYOSHI Co Ltd 3713050 2A Ver 080123 Introduction Thank you very much for purchasing the touch sensor The touch sensor is a product that has been developed based on our advanced technology and rich experience This user manual describes the information necessary for use of the sensor such as its functions capabilities and proper usage When using the touch sensor please keep the following in mind O Only specialists with knowledge of electricity must handle the touch sensor Please read and understand the contents of this manual thoroughly to use the touch sensor appropriately O Keep this manual handy to refer to it again later on specific problems Points to note when using the touch sensor O Although OMRON makes constant efforts to improve the quality and reliability of its semiconductor products products such as this touch sensor may malfunction or break Before using the touch sensor please contact OMRON s business development personnel if necessary to confirm product specifications while also paying attention to using the sensor with a sufficient margin allowed for its ratings and capabilities and taking safety measures such as installing safety circuits to minimize hazards in the unlikely event that a failure of the sensor might occur O Basically this product is not designed and manufactured for use
14. 713050 2A Ver 080123 6 2 17 REFx Reference value for each channel read write enabled only in setup mode The reference value for each channel can be set with an unsigned 16 bit integer Can only be changed in setup mode or rewrite automatically by teaching It is not changed by drift compensation Command code SD aa Channel 0 REFO Command code 0x40 Channel 1 REF1 Command code 0x45 Channel 2 REF2 Command code 0x4A Channel 3 REF3 Command code 0x4F Channel 4 REF4 Command code 0x54 Channel 5 REF5 Command code 0x59 Channel 6 REF6 Command code Ox5E Channel 7 REF7 Command code 0x63 6 2 18 THRx Defines the threshold to judge a touch event read write enabled only in setup mode signal change or Threshold to judge a touch event for each channel can be set with an unsigned 16 bit integer Can only be changed in setup mode or rewrite automatically by the teaching function It is not changed by drift compensation Command code SN a a PEPPER Channel 0 THRO Command code 0x41 Channel 1 THR1 Command code 0x46 Channel 2 THR2 Command code 0x4B Channel 3 THR3 Command code 0x50 Channel 4 THR4 Command code 0x55 Channel 5 THR5 Command code 0x5A Channel 6 THR6 Command code 0x5F Channel 7 THR7 Command code 0x64 6 2 19 HYSx Hysteresis for each channel read write enabled only in setup mode Hysteresis for each channel can be set with an unsigned 16 bit integer Can only be changed in setup mode or rewrite automati
15. 9 8 7 6 0x01 5 4 3 2 PEER 6 2 3 DCHx Measured value for each channel read only Measured value for each channel is indicated by an unsigned 16 bit integer Command code 15 14 13 12 11 10 9 8 7 6 S 4 3 2 1 0 AAA all al ad Channel 0 DCHO Command code 0x02 Channel 1 DCH1 Command code 0x03 Channel 2 DCH2 Command code 0x04 Channel 3 DCH3 Command code 0x05 Channel 4 DCH4 Command code 0x06 Channel 5 DCH5 Command code 0x07 Channel 6 DCH6 Command code 0x08 Channel 7 DCH7 Command code 0x09 6 2 4 CREFx Current reference value for each channel read only Current reference value for each channel is indicated by an unsigned 16 bit integer Command code 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 a li Channel 0 CREFO Command code Ox0E Channel 1 CREF1 Command code 0x11 Channel 2 CREF2 Command code 0x14 Channel 3 CREF3 Command code 0x17 Channel 4 CREF4 Command code 0x1A Channel 5 CREF5 Command code 0x1D Channel 6 CREF6 Command code 0x20 Channel 7 CREF7 Command code 0x23 3713050 2A Ver 080123 6 2 5 CTHRx Current judging change for each channel read only Current judging change for each channel is indicated by an unsigned 16 bit integer Command code SEE EP PP PEE EP PEPE Channel 0 CTHRO Channel 1 CTHR1 Channel 2 CTHR2 Channel 3 CTHR3 Channel 4 CTHR4 Channel 5 CTHR5 Channel 6 CTHR6 Channel 7 CTHR7 Command code 0x0F Command code 0x12 Command code 0x15 Command code
16. CHIA B6TS 08LF OUT4 2 2 COMO1 OUT5 30 T CHOA OUT6 31 0 SETUP OUT7 gt CHG 1 2 3 4 5 6 Y 8 S S R M V T V T Cc D E E S E D E K S A S S D S E S T T T 1 2 Figure 2 Pin assignment Note Pins TEST1 6 pin and TEST2 8 pin are used for testing during manufacture of the IC During normal operation of the IC connect them to Vdd through a pull up resistor 2 2 Pin functions Table 1 Pin functions Pin No Designation eh Function 11 CHOA 13 CH1A 14 CH2A 16 CH3A 1 0 Connect these pins to the touch electrode through the measurement pins 17 CH4A channels 8 to 0 19 CH5A 21 CH6A 23 CH7A e a Common use measurement pins channels 8 0 I O Common use measurement pins for two channels each gt ne Connect these pins to charge capacitors through resistors 3713050 2A Ver 080123 Input i Pin No Designation Output Function Vad Power Supply Input 3 0 5 5V 5 20 Vss Ground An output pin which indicates the operation status Normal measurement mode Outputs measurement results Serial communication mode Measurement termination output Two output modes are available 9 CHG O 1 High signal output every time a measurement finishes 2 High signal output when the condition changes in any one of the channels touch no touch no touch gt touch Setup mode When setup mode is entered CHG pin g
17. M write command 0x3F must be received When an EEPROM write command is received the content of the register is stored in EEPROM 6 1 List of commands Table 3 List of command Access limit ER oO 8 Command Desig ae _ code nation Deseription l Note E Q 2 e 2E 0x00 ID Chip ID R 0x0281 for this chip 0x01 BDATA Detected result of each channel R O O 1 channel 1 bit 0x02 DCHO ChO measured value R O O 0x03 DCH1 Ch1 measured value R O O 0x04 DCH2 Ch2 measured value R O O 0x05 DCH3 Ch3 measured value R O O 0x06 DCH4 Ch4 measured value R O O 0x07 DCH5 Ch5 measured value R O O 13 3713050 2A Ver 080123 Access limit ree 3 NS 2 ation Description 2 E E Note E o Se So NES IS oO 2E 0x08 DCH6 Ch6 measured value R O O 0x09 DCH7 Ch7 measured value R O O 0x0A System reservation 0x0D Result of drift compensation is Ox0E CREFO Current ChO reference value R O OD reflected OxOF CTHRO Current ChO judging change R O O cid dritt compensations 0x10 CHYSO Current ChO hysteresis value R O O Brae drift compensation is Result of drift compensation is 0x11 CREF1 Current Ch1 reference value R O O reflected 0x12 CTHR1 Current Ch1 judging change Bulls no een eons 0x13 CHYS1 Current Ch1 hysteresis value R O O de drift compensat
18. Warranty Details 1 Warranty period The warranty period for an OMRON product is one year from purchase or delivery to a customer specified place 2 Scope of warranty If any OMRON product fails under OMRON liability within the above warranty period OMRON shall supply a replacement or repair the product free of charge at the place of purchase However if the reason for the product failure falls into any of the following categories the warranty will not apply a The product has been used or handled under conditions or in an environment not listed in the product s specifications catalog or operation manual hereinafter referred to as the catalog and the like b The failure has been caused by a non OMRON product c The product has been modified or repaired by somebody or corporation other than OMRON d The product has been used for other than its intended use e The failure could not have been predicted based on the level of science or technology at the time of shipment f The failure has been caused by a natural or other disaster an accident or the like that is not OMRON s liability This warranty applies only to the OMRON product itself and any damage induced by a failed OMRON product is excluded from this warranty 3 Scope of service The price of an OMRON product does not include service expenses such as the cost of sending out technicians If you wish to request non inclusive services please consult OMRON sales per
19. c and Cc to each touch electrode as shown in the diagram below Refer to the design tool B6TWorkbench Circuit Constants for recommended values Reference values Rr 10kQ Rc 3 9kO Cc 0 1uF Cr 15pF CrO Cr1 18pF Cr2 Cr4 22pF Cr3 Cr5 7 VDD VDD VDD VDD VDDVDD VDD VDD VDD Ch0 Chi Ch2 IH amp Ch3 Ch4 IH Ch5 Ch6 Ch7 Figure 3 Example of circuit Note 2 Connect a bypass capacitor of about 0 1 uF between Vdd and Vss using wires as short as possible Note 3 Connect a bypass capacitor of about 0 01 uF between SETUP pin and Vss 3713050 2A Ver 080123 Operation mode This chip has three operating modes Each mode is selected by the MEAS pin and SETUP pin 1 Normal measurement mode Normal operation mode to detect touch no touch Serial communication and On Off output mode can be selected 1 1 On off output mode OUTO OUT7 pins are used Touch no touch detection results are output from the respective channels with low high signal 1 2 Serial communication output Measured results are transmitted in serial with a 3 wire SPI function using SCK SD and SCS signals 2 Setup mode Chip operation is set to serial communication Table 2 Operation mode
20. cally by the teaching function It is not changed by drift compensation Command code SD a a HYSO HYS1 HYS2 HYS3 HYS4 HYS5 HYS6 HYS7 Channel 0 Channel 1 Channel 2 Channel 3 Channel 4 Channel 5 Channel 6 Channel 7 Command code 0x42 Command code 0x47 Command code 0x4C Command code 0x51 Command code 0x56 Command code 0x5B Command code 0x60 Command code 0x65 gt Ree Na 3713050 2A Ver 080123 6 2 20 RTHRx On judgment ratio for each channel read write enabled only in setup mode Used in teaching Sets the ratio of the quantity of judging change THRx to the measured value observed in teaching with an unsigned 4 bit integer Refer to 7 Teaching for details Only the lower order 4 bits are valid If the other bits are written to they are ignored If the measured value changes by AA due to a touch during teaching the quantity of judging change that is newly set in teaching THRx is calculated as Quantity of judging change THRx AA x on judgment ratio RTHRx 81 1 16 For example if RTHRx 10 the quantity of judging change THRx is THRx AA x 10 1 16 AA x 0 69 about 70 of AA Command code 15 Ss lB Be a a a Channel 0 RTHRO Command code 0x43 Channel 1 RTHR1 Command code 0x48 Channel 2 RTHR2 Command code 0x4D Channel 3 RTHR3 Command code 0x52 Channel 4 RTHR4 Command code 0x57 Channel 5 RTHR5 Command code 0x5C Channel 6 RTHR6 Command code 0x61 Channe
21. el and can be set for each channel independently The relationships between the measured value and the above values are as follows Measured value lt Reference value judging change Touch Measured value gt Reference value Judging change Hysteresis Touch to no touch Measured value 5 Touch on electrode Reference mm value Judging change 4 Hysteresis Time Judged as touched Figure 5 State of touch Even in the no touched state the measured value changes according to variation in the environment output drift The chip is provided with an automatic drift compensation function which can cancel mild changes of the measured value due to variation in the environment The drift compensation function can be enabled or disabled in setup mode 11 3713050 2A Ver 080123 5 Serial communication It is possible to read out measured values and set the operation mode by sending receiving data to from this chip through serial communication Serial communication is performed with the three wire SPI using SCS chip select SCK transfer clock and SD data transmission and reception host gt B6TS B6TS gt host SPI communication The SPI communication method works as follows Refer to 8 Electrical specifications for specific communication timing etc I Operation in SPI slave mode Supply SCS chip select and SCK transfer clock from an external source O SCK transfer
22. erwise the safety of the product may be impaired accumulated electrostatic charges may damage the product or the electrode may corrode Adopt a structure that covers the surface of the touch electrode with nonconductive material and does not allow anybody to touch the metal part of the electrode directly The recommended thickness for the nonconductive material is Resin material dielectric constant of 2 to 3 no more than 2mm Glass material dielectric constant of about 5 no more than 4mm 2 3713050 2A Ver 080123 6 Configurable data When setting data with commands consider the environment and conditions for using the touch sensor e g location and circuit configuration to determine proper values which may not cause functional or safety problems 3713050 2A Ver 080123 Proper usage 1 Method of transportation and storage 1 Do not drop or apply any shock to the touch sensor because it is a precision device If the sensor is thrown or dropped it may break 2 When carrying or storing the touch sensor keep its packaging properly oriented If the packaging is placed upside down or tilted the sensor may be subjected to some undue force and may break 3 Store the touch sensor under the following conditions to prevent the package from absorbing moisture Otherwise the sensor may break when the package is mounted lt Storage conditions gt A Before opening the moisture proof pack aluminum laminate pack
23. heat resistant However place the tray on a flat base such as a level block and then cool it down on the base to prevent deformation after baking 1 The above storage conditions A C are exceeded 2 The color of the 30 RH detection part of the indicator changes to lavender or pink lt Baking method gt Temperature 125 C Time 6 hours Number of times Up to three Cumulative time limit 72 hours 2 Measures against electrostatic charges during handling Keep the relevant electric equipment work bench and worker at the same potential Lay a conductive mat with a surface resistance of 10 kQ 10 MQ on the work bench and ground the mat The user must make sure that there is no electric leakage from the electric equipment to ground The electric leakage must be limited by the use of a resistor of about 1 MQ for safety All safety regulations must be observed Any electric leakage from the electric equipment is undesirable from the viewpoint of worker safety Check to be sure that there is no electric leakage from the tester curve tracer oscilloscope or the like and then ground the equipment Any electric leakage can break the CMOS IC The same precautions apply to soldering irons 3713050 2A Ver 080123 3 Recommended soldering Conditions Recommended soldering conditions Pb free Temperature conditions for mounting the IC chip When mounting the IC chip at a high temperature by using reflow soldering the melting temperat
24. in any voltage or current that exceeds the absolute maximum ratings 2 Use the device within the recommended specifications to enhance the quality of the device 3 Do not apply any forward bias to any of the pins Otherwise excessive forward current may cause thermal breakdown of the IC 4 Do not connect any output pin directly to power If any output pin is directly connected to low impedance power the internal wiring may melt down or break thermally due to excessive current 5 3713050 2A Ver 080123 CONTENT T 2 Overview Pin connections Operation mode Measurement Serial communication Commands Teaching Electrical characteristics Appearance and dimensions Overview 3713050 2A Ver 080123 This chip is a sensor IC to detect micro capacitances and can be used in touch sensors Internally the chip employs the CMOS process and is contained in a 32 pin TQFP plastic package The IC has 8 independent measurement pins of which each can measure capacitance independently On Off or serial communication output can be selected as the output mode The IC is provided with an EEPROM that can store operation mode Pin connections 2 1 Pin arrangement diagram S Cc E V C C C C H O H S H O H S 7 M 6 S 5 M 4 A 6 A A 4 A 7 5 le lla OUTO 3 16 CH3A OUTI 26 5 COM23 OUT1 27 CH2A OUT3 2 3
25. in equipment or systems operated under potentially hazardous conditions If you intend to use the touch sensor with any of the following systems facilities or equipment be sure to consult OMRON sales personnel or an agent or dealership first A Atomic power control equipment incineration facilities railroads aircraft vehicle equipment medical appliances amusement machines safety devices and facilities that must comply with the regulations of administrative agencies and their respective industries B Systems machines and devices that are potentially hazardous to humans and property C Other usages that require a high degree of safety The technical information contained in this manual is prepared only to describe typical performances and application examples of the product Application of the products based on the information does not infer the grant of any OMRON or third party intellectual property right or license 1 Preventing malfunction caused by contact with an electric conductor other than a human finger with the touch electrode Because this product measures the electrostatic capacitance of the detector electrode the product may operate if something other than a human finger is brought into contact with the electrode Therefore a fail safe design is required for use of the product so that it does not cause any functional or safety problem even on such occasions Substances etc that may cause a malfunction if they are pre
26. ion is 0x14 CREF2 Current Ch2 reference value R O O Be Ari compensalonts 0x15 CTHR2 Current Ch2 judging change R O O ud driftcompensationiis 0x16 I CHYS2 Current Ch2 hysteresis value R O O A drit compensation is 0x17 CREF3 Current Ch3 reference value R O O no E dnft compenisation is 0x18 CTHR3 Current Ch3 judging change R O O ne menso 0x19 CHYS3 Current Ch3 hysteresis value R O O a aS drift compensation is Ox1A CREF4 Current Ch4 reference value R O O Be Ari compensatonis 0x1B CTHR4 Current Ch4 judging change R O O a dritt c omp nsationiis 0x1C CHYS4 Current Ch4 hysteresis value R O O ae aS drift compensation is 0x1D CREF5 Current Ch5 reference value R O O la Ari compenisaon is 0x1E CTHR5 Current Ch5 judging change R O O Secar dritt c omp nsationiis 0x1F CHYS5 Current Ch5 hysteresis value R O O a aS drift compensation is 0x20 CREF6 Current Ch6 reference value R O O ne Ari compensqU nis 0x21 CTHR6 Current Ch6 judging change R O O era drift c mp nsation is 14 3713050 2A Ver 080123 Access limit NS 2 BR Description 8 Note 58 0 ZE 0x22 CHYS6 Current Ch6 hysteresis value R O O en compensations 0x23 CREF7 Current Ch7 reference value R O O Ecce compensations 0x24 CTHR7 Current Ch7 judging change R O O en compensations 0x25 CHYS7_ Current Ch7 hysteresis value R O
27. istics Desig mw Note 1 j nation Item Condition Minimum Standard Maximum Unit Von High Output voltage lon 5MA Vaa 0 2 Vaa V Vo Low Output voltage lo 5mA 2 0 V IH High Input current V 5V Vdd 5V 5 uA liL Low Input current Vi 0V_ Vdd 5V 5 uA S pplycurr ni Normal measurement mode 6 5 mA ee pp y Sleep mode 1 2 mA Number of times of 5 7 EEPROM write Topr 0 60 C 10 000 Times _ Br Vaa 5V Torr 25 C EEPROM write time Note 2 400 mS EEPROM data retention a period Topr 55 C 20 Years Note 1 Unless otherwise specified Vag 3 0 5 5V Topr 20 85 C Note 2 The period following receipt of the EEPROM write command in setup mode until the data write finishes 27 8 4 3713050 2A Ver 080123 Necessary timing conditions SCS tsutscs teisck trisck trsck thiscs twiSCKH SCK SD input ta scs SD output __tsuscs ses teisck tien twiso bien twicD a 10 11 12 13 141516 17 18 19 20 21 222324 25 26 27 28 29 30 31 32 SCK Command Dummy data Data w22290292229292922272703279222292939222 tsu SETUP SETUP CHG Figure 11 Timing conditions diagram 28 3713050 2A Ver 080123 Table 4 Necessary timing conditions Designa Rated value tion Item Condition Minimum Standard Maximum unit tescK Serial communication clock cycle time 15
28. l 7 RTHR7 Command code 0x66 6 2 21 RHYSx Hysteresis ratio for each channel read write enabled only in setup mode Used in teaching Sets the ratio of hysteresis HYSx to the measured value observed in teaching with an unsigned 4 bit integer Refer to 7 Teaching for details Only the lower order 4 bits are valid If the other bits are written to they are ignored If the measured value changes by AA due to a touch during teaching the new hysteresis that is set in teaching HYSx is calculated as Hysteresis HYSx AA x Hysteresis ratio RHYSx 16 For example if RHYSx 2 hysteresis HYSx is HYSx AA x 2 16 AA x 0 13 about 13 of AA Command code 15 ag EN SEG EI OC ed Ka Channel 0 RHYSO Channel 1 RHYS1 Channel 2 RHYS2 Channel 3 RHYS3 Channel 4 RHYS4 Command code 0x43 Command code 0x49 Command code 0x4E Command code 0x53 Command code 0x58 Command code 0x5D Command code 0x62 Command code 0x67 Channel 5 RHYS5 Channel 6 RHYS6 Channel 7 RHYS7 o o a A N Refer to 6 1 List of commands for the command code corresponding to each channel 22 3713050 2A Ver 080123 6 3 Default parameters in the EEPROM shown in the Workbench monitor Ae Setup parameters ee EN White to file ss General settings MODE Read from B6TS Write to BETS Output mode CON Serial On of CHG active GHG C Every Measurement On Off Drift compensation DC DGF
29. mand access O Access to commands 0x00 Ox7F e For read operation Command Code dummy data 0x00 e For write operation Command Code 0x80 dummy data 0x00 data upper 8 bits data lower 8 bits For write accesses transmit each command ORed with 0x80 6 Commands The commands and data used in serial communication are listed below The data comprises read only data read and read write data read write If a write command is applied to read only data the operation will be invalid Some data is not accessible in some operation modes If inaccessible data is read out the read data is indefinite If inaccessible data is written the data is ignored Command code Main function Read write Access limit Designation pesmi Normal measurement Setup mode mode in serial communication mode 0x00 ID Ox25 CHYS7 Measured data Read only Accessible Accessible 0x39 CHEN 0x67 RHYS7 Parameter setting Read write Inaccessible When writable data are written in this chip the built in register corresponding to each command is rewritten Then if the normal measurement mode is entered the chip can be operated with the written parameters mode etc In this case because only the built in register is rewritten the value in each register returns to its original value value stored in EEPROM when power is turned off and on again To store the built in register value in EEPROM an EEPRO
30. ntered any input other than RESET is invalid until the measurement finishes and the chip comes out of teaching mode Be aware that serial communication cannot be performed concurrently Parameter setting preparation 1 Juding change THRx input around twice value of actual variation difference between non touch and touch 2 Hysteresis HYSx 3 Teaching measurement count TCAL 4 On judgment ratio RTHRx 5 Hysteresis ratio RHYSx Initate teaching aii MEAS pin HIGH SETUP pin LOW State of CHG pin indicating teaching status LOW HIGH CHG pin to HIGH y Measurement 8 times gt REFx compensation CHG pinto LOW Touch measurement Max TCAL x 32 times CHG pinto HIGH Calculate REFx and HYSx and store in EEPROM 1 Epa a 1 Teaching ends During this period touch each electrode at least 3 times gt Figure 9 teaching flow 24 3713050 2A Ver 080123 7 2 Preparation for teaching To perform teaching this chip must be brought into setup mode and some parameters must be set The parameters commands associated with teaching are as follows 7 2 1 Teaching measurement count Refer to 6 2 8 TCAL Teaching measurement count During teaching measurement is executed x number of times where x is the value of this parameter x 32 Hereafter this is referred to as the teaching measurement count It takes
31. o for each channel These parameters set the ratios of the quantity of judging change THRx and hysteresis HYSx to the variation of the measured value caused by touch During teaching each electrode must be touched three times or more Then the minimum value of the quantity of variation caused by touch is calculated for each electrode of the chip Minimum value of quantity of variation The new quantity of judging change and the new hysteresis are calculated using the minimum value of quantity of variation AA as Quantity of judging change THRx AAx On judgment ratio RTHRx 1 16 Hysteresis HYSx AAx Hysteresis ratio RHYSx 16 Measured value Touch on electrode THRx AA X On judgment ratio RTHRx 1 16 HYSx AA X Hysteresis ratio RHYSx 16 m Time Figure 10 teaching parameter setting 25 3713050 2A Ver 080123 7 3 Performing teaching There are two ways to enter teaching mode 1 SETUP pin low and MEAS pin high 2 Write 0 into bit15 TS using the MODE command in setup mode When entering teaching mode by method 1 set the SETUP pin to high or the MEAS pin to low before teaching finishes If SETUP pin high and the MEAS pin low teaching will commence again When entering teaching mode the CHG pin changes to high indicating entry to teaching mode Just after teaching has started the chip calibrates the reference value REFx the measured value with no touch The measu
32. oes high However when EEPROM write command is received and data is being written in EEPROM CHG pin remains low 2 SD I O Serial communication data I O 1 SCK Serial communication clock input 24 SCS Serial communication mode chip select input Setup mode Low input to this pin moves the chip into setup mode 10 SETUP Connect to Vdd through a pull up resistor In addition insert 0 01uF ceramic capacitor between this terminal and VSS Initiation of measurement Capacitance measurement is initiated by inputting high 4 MEAS to this pin While low is input to this pin the chip is held in standby status 6 TEST1 Connect to Vdd through a pull up resistor 8 TEST2 Connect to Vdd through a pull up resistor 3 Reset signal input RESET Inputting low to this pin resets the chip 25 OUTO O Output pin for ChO can be set to active Low or active High 26 OUT1 O Output pin for Ch1 can be set to active Low or active High 27 OUT2 O Output pin for Ch2 can be set to active Low or active High 28 OUT3 O Output pin for Ch3 can be set to active Low or active High 29 OUT4 O Output pin for Ch4 can be set to active Low or active High 30 OUT5 O Output pin for Ch5 can be set to active Low or active High 31 OUT6 O Output pin for Ch6 can be set to active Low or active High 32 OUT7 O Output pin for Ch7 can be set to active Low or active High 3713050 2A Ver 080123 2 3 Example of circuit Note 1 Connect Rr Cr R
33. ouched 0 Low Active OUTx terminal is LOW when touched Only the lower order 8 bits are valid If the other bits are written to they are ignored Command code 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 crearan 6 2 10 CHEN Measurement enable for each channel read write enabled only in setup mode Enable Disbale measurement per channel 1 measurement executed 0 not executed Only the lower order 4 bits are valid If the other bits are written to they are ignored Command code 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 AAA AAA 6 2 11 TCAL Teaching measurement count read write enabled only in setup mode Defines the termination of the teaching algorithm if not 3 touch events per channel were found with this time Only the lower order 8 bits are valid If the other bits are written to they are ignored 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 ERDE 6 2 12 TOG Toggle action read write enabled only in setup mode Selects momentary or latching output mode This output takes effect on the signals output from OUTO 7 and BDATA command data 1 Toggle mode off momentary action turned on only during a touch event 0 Toggle mode on alternate action turned on with the first touch event and off with the next touch event Command code 0x3A Only the lower order 8 bits are valid If the other bits are written to they are ignored 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 partera 6 2 13 ACD Judging count read write enabled only in se
34. rement is performed eight times for each electrode and the average of the eight measured values is taken as REFx After the calibration finishes the CHG pin output changes to low Do not touch the touch electrode until the CHG pin changes to low After REFx has been calibrated the chip starts the teaching measurement count TCAL x32 times During this period touch each electrode three times or more The order for touching each of the electrodes is not defined After the specified number of teaching measurements have finished the CHG pin changes to high However if the number of touches the number of times the chip recognizes a touch reaches 32 the chip finishes measuring and changes the CHG pin to high even if the teaching measurement count has not been reached When touching the electrodes do not touch two or more electrodes at the same time lf you do teaching cannot be performed correctly If more than one electrode is touched simultaneously in error touch each of the electrodes touched simultaneously again Touch all of the electrodes three times or more within the teaching measurement time After the touch measurements have finished the chip updates the quantity of judging change THRx and hysteresis HYSx according to the calculation formula described in 7 2 4 On judgment ratio and hysteresis ratio updates the values stored in the built in ROM After the values are updated the CHG pin changes to low and teaching finishes 7
35. sent near to or on the detector are O Water metal animals other conductive materials 2 Preventing operational error Because this product detects human touch it may operate if the detector electrode is touched only lightly or if somebody remains nearby When incorporating this product into a device check the detection range thoroughly and employ measures to prevent the device from malfunctioning caused by operational error Especially if the device is used where children may come into contact with it provide some safety measure such as a child safety lock 3 Preventing the entry of water or corrosive gases If water or a corrosive gas enters the operating part of the sensor electrode in the event of a short circuit or corrosion of the electrode the sensor may malfunction or its detection sensitivity may be lowered If the product is supposed to be used in an environment where this may occur employ some structure to prevent the entry of water or gas and check to be sure in actual operation that the device is protected securely against such an event 4 Preventing malfunction caused by noise The product may malfunction if subjected to excessive noise Check to be sure that no safety problems are caused by excessive noise 5 Preventing direct touching of the electrode Do not employ any structure that exposes the surface of the touch electrode to the air and allows somebody to touch the metal part of the touch electrode directly Oth
36. sonnel 4 Scope of application The above apply only to business and usage in Japan Please consult OMRON sales personnel about business and usage in other countries 31
37. tup mode After ACD value 1 consecutive measurements atouch event or no touch event is judged and the output state is changed This takes effect on the output signals from OUTO 7 and BDATA command data For example with ACD 2 after three consecutive measurements are judged as a touch event or no touch event the output state changes Command code 0x3B D7 DO ACDon Default 001 0b Sets the cumulative judgment count for touch Off to On transition D15 D8 ACDoff Default 0010b Sets the cumulative judgment count for touch On to Off transition Command code 1 3 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 ARRE 19 3713050 2A Ver 080123 6 2 14 SLP Sleep time read write enabled only in setup mode Defines the duty cycle between one measurement and the next measurement operate time and sleep time Sleep mode is activated for SLP value x 10mS Typ When SLP is set to 0 measurements are made consecutively without sleep time Only the lower order 8 bits are valid If the other bits are written to they are ignored Command code 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Aa 6 2 15 MODE Operation mode read write enabled only in setup mode Select active mode Only the bits described are valid If the other bits are written to they are ignored Command code 5 14 3 2 1 10 9 8 7 6 5 4 3 2 1 0 pe a A a lla TS Teaching start 0 Teaching mode is entered when 0 is written in this bit 1 During read out
38. ure of the solder depends on the mounting board and paste adhesive materials of the mounting board and the paste adhesive Referring to the mounting temperature profile shown in the following figure choose the optimum soldering temperature within the profile 1 Reflow method infrared light reflow and air reflow 260 C max a 255 C or higher for 20 sec max 200 C a 217 C or higher for 60 150 sec u 65 C sec max Package surface temperature C 60 180 sec Time sec Figure 1 Reflow Method Temperature Profile 2 Wave soldering method called known as flow soldering or dip soldering Wave soldering method using Pb free solder is not recommended 3 Soldering iron manual soldering Solder using a soldering iron for semiconductor devices under the following conditions Iron tip temperature 350 5 C Soldering time No longer than 5 sec pin 4 Recommended wash conditions The wash conditions compliant to MIL STD 883C are recommended When using rosin flux wash check the following items 1 Amount of contamination containing residual ions or no ions 2 Administrative directions and regulations 3 Melting resistance of parts 5 Handling after mounting parts on PCB When dividing a PCB on which ICs are mounted do not apply any excessive force to the ICs Otherwise the internal IC chips may be broken 6 Applied voltages and currents 1 Do not apply to any p
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