DS2788K Evaluation Kit
Contents
1. 1 71675 Active Emtpy Current mA Control Register sense Resistor mOhms ead Factory VIE Write amp Copy Rott ppm c EM cave set Load Setup Load Default set Up The Application Units Sub Tab allows the user to read and write the Parameter EEPROM memory block To change any of this information simply click on the desired text field and enter the new value Clicking on the Load Default Set Up button will enter example data into the information fields of the Application Units Sub Tab Once all data is in the desired format click on the Write amp Copy button to copy it to the EEPROM of the DS2788 This information can also be stored to a file and recalled later using the Load Save Set Up buttons or the Load Save Parameters Set Up Menu Items These functions do not directly write or read the DS2788 It is still necessary for the user to store or recall this information to or from the device by issuing a Write amp Copy or Recall amp Read buttons 9 of 13 DS2788K Device Units Tab DS2 788K Registers 1 Wire Speed Preferences Help Parameters Hex Value Device Units Hex Value Device Units BOR Control Seg_4 slope 305 AE Seg 3 slope 2h 122 ppm Blh Acc B Pers 00h 0 000000 mv 72h AE Seq Slope 11h 1038 ppm berb3h Capacity 24 40000 Mh AE Seg 1 Slope 27h 2380 ppm b4h Charge Voltage 4 13824 V2. 4h SE Seg 4 slope Oh 61 Charge Current anh 1 BO mv rbh SE Seg 3 slope 2h 1 22 pom 76h SE Seg_2 Slope 5 305 ppm 66h AE Volt 300808V altage 4Dh 3 00608 V 77h Segl Slope 15h 1282 ppm b h AE Current 2 Ah 8 4 mV RSGAIN 0416h 1 02637 bah Active Empty 40 0 0048828 PAR Role 00h 0 bah RSNSFP azh 20 0000 mOhms TBh Curr Offset Bras ECh 0 031250 mv EA BEh Full 40 F Dh 24 28125 mhrs _ T23 6Ch Full Seg_4 Slope Dh 793 ppm 1 20C Dh Tiz OC Frh 15076 ppm Full Seg 2 Slope 33h 3113 Full Seg_1 Slope 3601 ppm 33473 Recall amp Read bOh Full seg_3 Slope The Device Units Sub Tab is read only It displays the actual hexadecimal values read from the DS2788 and displays the units that are stored in the device 10 of 13 DS2788K MEMORY TAB D52788K Registers 1 Wire Speed Preferences Help YU EEPROM Block 1 b h 7Fh Descripton Address Descripton Address Control b h AE 40 bah Acc Bias RSNSF bah Aging Cap 6 beh Full 40 MSB Aging Cap LSB b3h Full 40 LSB bBh Charge voltage b4h Full Seg 4 Slope bCh Charge Current Full seq_3 Slope HOR AE Voltage Full seq_ Slope AE Current brh Full Seg_1 Slope Read write Recall Copy Fermanently Lack EEPROM Black 1 The Memory Tab
3. Accumulated Charge Log to File Filename c DS2788K_datalog tet Voltage Current amp veCurrent Temp ALR Full 3 704 0 000 0 000 054 375 1135 0710 155352 22971 B3 3 783 0 000 0 000 dero gh43 b 1135 0710 155352 2 297 B3 sampling Interval Secoriec Clear Graphs The Log Data tab allows the user to see the 05278875 real time measurements graphed over time There are separate sub tabs for voltage current temperature and accumulated charge Each graph displays the last 500 data points collected by the DS2788K software The sampling interval can be adjusted from as fast as possible to 15 minutes and can be adjusted from the Sampling Interval Menu at the bottom of the window The Clear Graphs button will clear all data from all four graphs but does not reset the log to file function When the Fastest sampling interval is selected the graphs will not be updated only the data logging 15 enabled The Log to File Sub Tab contains control information for storing all data to an ASCII file The default filename is c DS2788K_datalog txt but can be modified the filename text field The Log Data button toggles data logging off and on Data will be stored at the same interval selected for updating the graphs in the tab delimited format of Iime tab Voltage tab Current tab AveCurrent tab Temperature tab ACR tab Full tab AE lt tab gt SE lt tab gt RAAC lt tab gt RARC lt tab gt RSAC lt tab gt RSRC lt tab gt Status l
4. MAXIM DS2788K Evaluation Kit Standalone Fuel Gauge IC with LED Display Drivers FEATURES Demonstrates the capabilities of the 052788 Standalone Fuel Gauge IC with LED Display Drivers including Estimation of available capacity for Li cells Voltage measurement Voltage divider circuit Current measurement Current accumulation Temperature measurement Information storage Identification LED Display Interfaces to the USB Port of a PC running Windows XP or older INDEX Evaluation Kit Contents Equipment Needed Introduction Setup and Installation Board Connections Software Installation Selecting the COM Port Program Menus Menu Windows Status Register Program Tabs Parameters Tab Memory Tab Log Data Tab Real Time Tab INTRODUCTION ORDING INFORMATION PART TYPE DS2788EVKIT Denotes lead Pb free and RoHS compliant EVALUATION KIT CONTENTS 1 pc Evaluation Board 1 DS91230 USB Adapter 1 pc RJ 11 Cable EQUIPMENT NEEDED 1 A PC running Windows XP or older and an available USB port 2 Cables with mini grabber style clips or the ability to solder directly to connection pads 3 A Lithium Ion battery and a power supply and or load circuit 052788 Evaluation Kit Kit makes performance evaluation software development and prototyping with the 052788 Standalone Fuel Gauge IC with LED Display Drivers easy The evaluation board interface
5. e The user can bring up the Set Current Offset Bias Register window by left clicking the Current Offset Bias button This window allows the user to enter values for the Current Offset Bias Register in mA Left clicking on the Write button will write the Current Offset Bias Register and copy the value to EEPROM The value entered here will be added to the Current Register during each current conversion 7 of 13 052788 Fuel Gauge Data Tab DS2788K 4 Registers 1 Wire Speed Preferences Help Real Time Levels Flags Full 1135 07 mAhr O Full Charge Active Empty Active Empty 15 64 mAhr Stand by Empty Stand by Empty 2 30 mAhr Learn Capacities Under Voltage reu bre cama Power On Reset y 18 838 4 mAhr O Power n Eese 7 7 78 RSAC 851 2 mAhr RSRE P5 Scaler Update 100 0000 75 5 LED Display The Fuel Gauge Data Sub Tab displays the latest fuel gauge calculations Full Active Empty and Standby Empty levels are calculated from the data input on the Parameters Tab The Remaining Active Absolute Capacity RAAC and the Remaining Stand by Absolute Capacity RSAC are displayed in terms of mAhrs The Remaining Active Relative Capacity RARC Remaining Stand by Relative Capacity RSRC are displayed in terms of percent of capacity remaining The Analog Meter on the left displays the Remaining Active Absolute Capacity The flags found in the Status Registe
6. eter EEPROM block 1 WIRE SPEED MENU D52788K Registers 1 Wire Speed Preferences Help Regular Speed Overdrive Speed The 1 Wire Speed Menu allows the user to select the appropriate 1 Wire timing The 1 Wire speed of the device is selected by sending the Set Overdrive or Clear Overdrive commands In order to change the speed of the device simply left click on Regular Speed or Overdrive Speed from the 1 Wire Speed Menu Selecting either option will send the Clear Overdrive or Set Overdrive command The software will send the command in the current Wire speed and then begin communicating in the new 1 Wire speed If the software and the DS2788 get out of sync simply left click on the Detect Device Speed to match the software s 1 Wire speed to the DS2788 s 1 Wire speed 4 of 13 DS2788K PREFERENCES MENU DS2788K Registers 1 Wire Speed Preferences Help Edit Preferences The Preferences Menu allows the user to change COM port settings at any time Edit Preferences opens the Select Preferences window See Selecting the communication port above HELP MENU DS2788K Registers 1 Wire Speed Preferences Help About Selecting the About topic from the Help Menu will open a window containing information about the current revision of this program and Dallas Semiconductor PROGRAM TABS All functions of the program are divided under four tabs in the main program window Left click on the approp
7. gives the user access to all 32 bytes of SRAM and all 48 bytes of EEPROM inside the DS2788 They are separated into four sub tabs for convenience Any value can be modified by clicking in that address text box and typing a new value in hexadecimal format The Write button will copy the entire block of data to the corresponding location inside the DS2788 Scratchpad RAM on the EEPROM blocks The Read button will update the entire block s text boxes with data from the DS2788 Scratchpad RAM on the EEPROM blocks Sub tabs displaying any EEPROM data will also have Copy and Recall buttons to allow the user to transfer the data between Scratchpad and EEPROM memory internal to the 052788 The Permanently Lock Block 0 1 buttons will permanently store the data currently located in that block s EEPROM Warning this data can never be changed once locked Verify your data first by issuing a Recall and a Read The Net Address Sub Tab allows the user to perform a Search Net Address to find all of the 1 Wire devices on the Wire bus All devices found on the bus will be listed in the Net Addresses field To communicate to any device on the bus click on its address inside the Net Addresses field to select it The program will now use this Net Address for all operations until a different Net Address is chosen 11 of 13 DS2788K LOG DATA TAB DS2788K Registers 1 Wire Speed Preferences Help Real Time Parameters Voltage Current Temperature
8. own in the temperature section Go to the sense resistor value on the Parameters Tab to change this value The present state of the PIO pin 15 shown in text The Set Clear PIO bit will set or clear the PIO bit in the Special Feature Register to toggle the state of the pin Set Accumulated Current Register Set Accumulated Current Register E New ACR Value 1750 00 mhrs Read Write Done The user can bring up the Set Accumulated Current Register window by left clicking the Set ACR button This window allows the user to enter a value for the Accumulated Current Register in mAH 6 of 13 DS2788K Set Accumulation Bias Register Set Accumulation Bias Register 4 Help New Accumulation Bias value 0 0000 Iu Current Reading 0 0000 The user can bring up the Set Accumulation Bias Register window by left clicking the Acc Bias button This window allows the user to enter values for the Accumulation Bias Register in mA Left clicking on the Write button will write the Accumulation Bias Register and copy the value to EEPROM value entered here will be added to the Accumulated Current Register during each current conversion The bias value will not affect the Current Register reading but will be reflected in the Accumulated Current Register Set Current Offset Bias Register Set Current Offset Bias Register 4 Help New Current Offset Bias value 0 0000 I Current Reading 0 0000 ma Read Write Don
9. pplication notes on the DS2788 and DS2788 EV Kit can be found on our website at www maxim ic com SELECTING THE COMMUNICATION PORT If the DS91230 is connected when the DS2788K software is launched the program will start up automatically If it is not connected the Select Preferences window will open In this window select either serial port or USB communication and the port number then hit OK The DS2788K software saves this port selection and automatically uses the selection each time the program starts To change the port later click the Preferences option on the menu bar select Edit Preferences and then select the appropriate port To attempt to automatically locate the DS91230 or DS9123 click the Poll Ports button Warning automatically polling for the DS9123 can disrupt other devices connected to your computer s COM ports m Select Preferences Fort Number 1 Port Type USE OK PROGRAM MENUS Several pull down menu options have been provided to simplify use of the DS2788K software for the user Their functions are individually detailed below FILE MENU D52788K File Registers 1 Wire Speed Preferences Help Save Parameter Set up Load Parameter Set up The File Menu allows the user to store and recall information to and from a file directly into the text boxes on the Parameters Tab These functions do not directly write or read the DS2788 It is still necessary for the user to store or recall this informa
10. r are displayed on the right side of the window When the Under Voltage Flag or the Power on Reset Flag is set a button will appear that will allow the user to clear those bits Scalar Register Set Age Scalar Mew Scalar value 36 875000 user can bring up the Set Age Scalar window by left clicking the Update button in the Scalar area This window allows the user to read and write the Scalar value in terms of percent of the nominal capacity 8 of 13 052788 PARAMETERS TAB The Parameters Tab gives the user access to the entire Parameter EEPROM memory block block 1 addresses 60h 7Fh in terms of Application Units and Device Units The Application Units Tab displays the parameters in units like mA mAhrs and volts The Device Units Tabs performs the calculations needed to get the application units into the units that stored the device like uV uVhrs and ppm as well as show the hexadecimal values that get written to the device Application Units Tab D52788K Registers 1 Wire Speed Preferences Help Parameters Application Units Device Units Read Only Temperature C 10 FOC Full 1016 1060 1098 1190 1214 Active Empty mAhrs 28 16 15 Stand by Empty mAhrs 7 3 2 0 Charge voltage s Rated Cell Capacity imAhrs 1 29000 Terminating t m erminating Current m Accumulation Bias m 000 t Offset Bi E Active Empty Voltage v
11. riate tab to move to the desired function page Located on the Real Time tab is all of the information measured and calculated by the DS2788 That data is divided between the Parametric Data Tab and Fuel Gauging Tab The Parameters Tab gives the user access to the entire Parameter EEPROM memory block in terms of Application Units and Device Units The Memory tab displays the contents of every register and memory location inside the DS2788 and allows the user to alter the data The Data Log tab allows the user to store all real time information to a file and view the data in a graphical form REAL TIME TAB The Real Time data is divided into three tabs Parametric Data and Fuel Gauge Data The Parametric Data Tab contains all of the real time measurements taken by the DS2788 The Fuel Gauge Data contains all of the Fuel Gauge values calculated by the DS2788 5 of 13 DS2788K Parametric Data Tab DS2788K Selk File Registers 1 Wire Speed Preferences Help Heal Time Parametric Data Fuel Gauge Data Voltage Current Charge Ae Remaining y 3 7841 Volts 0 0000 mA 854 3750 mAhr 8750 C Average Current 0 0000 mA Set ACR Acc Bias RAsense 20 00 mOhrms 5 LED Display The Parametric Data Sub Tab displays the latest real time measurements of cell voltage temperature current and accumulated charge with both analog meter readouts and digital values The sense resistor value used to calculate the current reading is sh
12. s to a PC through DS91230 USB Adapter and RJ 11 cable connection related data sheets along with the evaluation software can be found on our website at www maxim ic com Page 1 of 13 091027 DS2788K The DS2788K evaluation software gives the user complete control of all functions of the DS2788 Separate control tabs allow the user access to all EEPROM and RAM memory locations all control registers and real time updates of all monitored parameters The software also incorporates a data logging feature to monitor a cell over time The evaluation board circuit 15 designed to provide the DS2788 with accurate parameter measurements The initial evaluation board PD033007 is configured with a 2 cell voltage divider with the circuitry to turn the voltage divider on and off using the pin of the DS2788 Kit demonstration boards will vary as they are improved upon over time For information on the demonstration board circuits refer to the individual board datasheets located on our website at www maxim ic com SETUP AND INSTALLATION BOARD CONNECTIONS Connections to the TSSOP demonstration board are best made either by soldering directly to the pads or by using cables with mini grabber clips Communication to the TSSOP board can be accomplished either through the RJ 11 jack by connecting the provided standard six conductor RJ 11 cord or by wiring directly to the DQ and P pads To utilize the demonstration software the and PAC lines mu
13. st be connected to the DS91230 communication brick using either of the two methods described RJ 11 Figure 1 Communication Connections Figures 2a and 2b show the recommended circuits to simulate charging and discharging The Lithium Ion cell is connected between the and B pads The battery charger power supply or circuit load 15 connected between the P and P pads The evaluation software can be run in either configuration as long as a cell 15 connected between the B and B terminals providing a minimum of 2 5 volts to power the DS2788 Power Supply Battery Charger LOAD NOILV YIV A3 88 2 5 o N lt Co m Om gt lt XJ or gt 2 Figure 2a Charging Circuit Fig 2b Discharging Circuit SOFTWARE INSTALLATION To install the DS2788K software exit all programs currently running and download the DS2788K software from our website at www maxim ic com Unzip the compressed file and double click the SETUP EXE icon to begin the installation process Follow the prompts to complete the installation The 2 of 13 052788 DS2788K software can be uninstalled the Add Remove Programs tool in the Control Panel After the installation is complete open the DS2788K folder and run DS2788K EXE or select DS2788K from the program menu A splash screen containing information about the evaluation kit appears as the program 1s being loaded All relevant data sheets and a
14. t tab gt Scalar for easy import into a spreadsheet The most recent 50 samples are displayed in the window for observation Warning The Log Data function overwrites previous file information Data previously stored in the file will be lost 12 of 13 DS2788K EV KIT BOARD SCHEMATIC Meu LET chee 1 path igt carers 13 of 13
15. tion to or from the device by clicking on the Write amp Copy or Recall amp Read buttons on the Parameters Tab 3 of 13 DS2788K REGISTERS MENU DS2788K File Registers 1 Wire Speed Preferences Help Status Register Special Feature Register EEPROM Register Control Register The Registers Menu gives immediate access to all four status and function registers of the DS2788 Selecting any of the registers will open an individual control window giving the user a description of each register bit and the ability to read or write it See the status register window example STATUS REGISTER Status Register Bit CHGTF The Charge Termination Flag is Clear Bit b AEF The Active Empty Flag 15 Clear Bit 5 SER The Stand by Empty Flag is Clear Bit 4 LEARTF Learn Flag is Clear Bit 2 LF The Under Voltage Flag is Clear Bit 1 FORF The Power On Reset Flag is Clear The present state of all register bits are displayed immediately upon opening the register window R W locations contain a selection field or command button to allow the user to determine their state Pressing the WRITE button will write the new value to the register and read the corresponding register inside the DS2788 to verify the correct value was written The Control Register and Protection Threshold Register are stored in EEPROM so when the WRITE command is issued the value is written and copied to EEPROM without changing the values of the remainder of the Param
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