User manual - DV Industrial Computer
Contents
1. symbol slash First value is input voltage nominal value is 13 5V second value is 5Vsb third 12V fourth 5V and fifth 3 3V Values have sent in millivolts You can control voltages on the fly by sending this comand periodically w get current value of counter of WatchDog timer Press two keys w and Enter As a response the DP024 sends current value of counter of WatchDog timer in ticks each tick is 0 3s long W set current value of counter of WatchDog timer Press two keys W and then type the value of ticks from 0 to 255 each tick is 0 3s long and finish with Enter As a response the DP024 sends symbol slash and just entered value which allows to check accuracy of setting INPC DP024 Automotive PSU 17 x Connected Fan Examination Procedure Activation When the fan examination procedure starts the DP024 varies PWM value from 100 to 40 with 5 step and varies testing voltage from max to min values every 3sec The procedure starts with 100 value of PWM Later the rest of 12 values of PWM from 95 to 40 are proceeded Outcome of procedure is the update of fan threshold revolution matrix for really connected fans The values of threshold RPM are calculated according to special algorithm that is beyond the scope of this manual and will not be discussed here Procedure lasts for about 1 minute At that time the controller traces over the fan voltage and fan behaviour The controller determines the numb2. E PSU Enter details for the phone number that you want to dial Country region United States 1 Area code fi Phone number Cornectusing OATES Cancel INPC DP024 Automotive PSU 11 And set up COM3 properties COM3 Properties Port Settings Bits per second Data bits fe yl Parity None y Stop bits h y Flow control Hardware y Restore Defaults Cancel Apply Click on File button in main menu of Hyper Terminal program and click on item Properties in pop up menu In dialog window PSU Properties select bookmark Settings and select the following properties PSU Properties ConnectTo Settings Function arrow and ctrl keys act as Terminal keys Windows keys Backspace key sends ChkH Del Cti H Space Ctrl H Emulation v Terminal Setup Telnet terminal ID TELETYPE 33 Backscroll buffer lines 500 Play sound when connecting or disconnecting Input Translation ASCII Setup Cancel INPC DP024 Automotive PSU 12 When Hyper Terminal configuration has been finished everything is ready to dialog with the DP024 Commands that are entered on terminal keyboard are sent to the DP024 via serial port while input data flow is displayed on terminal window In the clear terminal window enter the first command h help press keys h and then Enter As a response the controller sends firmware release number and list o
3. 0 4m temperature sensor thermistor Place remote thermistor at CPU heatsink of your computer Connect the ATX Power Connector JP8 to the motherboard and any peripherals to JP9 connector INPC DP024 Automotive PSU 4 170 2 64 e e a o o o o A IPN aa n T 5 o NE COC ro a J ol o oof oo SO vel PRAO OOO OOP N 210 mir ES 200 min mm RTL RTE JP1S HEATER THERMISTOR 10k S TCH CONTROL Pin Jescription Pin Description 1 T_SIGN 1 HEATER_ON 12 cnp Z cnp JP2 RESET SWITCH JPE RS232 JP8 ATX OUT JP8 OUT din Description Pin Description Zin Pin Description 1 RESET SW 1 DCD nj 2 GND 2 SIN lt RD gt 2 12 P 3 SOUTCR 3 131 GN l 4 DTR 4 la ps gt SG 15 GN S DSR 6 TS GN 7 RTS 4 T T GN S cts El TEN 9 NC J E 19 Reol ES 10 201 5 Red ROO CHESS OO O08 UP7 EXTERNAL LED Pin Description 1 LED CATHODE lt gt LED ANODE OWER SWITC in Description i PWR SW GND H INPC DP024 Au
4. computer to detect the newly installd ACPI component INPC DP024 Automotive PSU 18 Then you have to configure Shutdown or Standby mode of operation for OS Windows as shown below Click Start then lt Settings gt and lt Control Panel gt then double click lt Display gt icon as result access lt Display Properties gt window Click lt Screen Saver gt tab and click lt Power gt button to access lt Power Option Properties gt window Click lt Hibernate gt tab check box x lt Enable Hibernate support gt click lt Apply gt Click lt Advanced gt tab and click down arrow to open choices lt Under Power buttons gt of lt When I press the power button on my computer gt select one of three choices Standby Hibernate or Power off options Come back to lt Power Option Properties gt window and select lt Portable Laptop gt under lt Power schemes gt and click lt Apply gt Then shutdown the computer click Start and lt Shut Down gt under lt ShutDown gt window Support and warranty Standard Hardware Warranty 1 Year Installation support 30 days via email INPC DP024 Automotive PSU 19
5. either 0 or 1 If the value is 1 then the DP024 is configured for restart in case of recovery after a special kind of errors revised The first of revised errors is overheating the error that appears when even one of two thermistor will reach 65 C but disappears when both thermistors will be below 55 C The second error is input voltage is lower than Low Voltage Threshold the error that appears when input battery voltage will drop lower than Low Voltage Threshold but disappears when input voltage will rise above Low Voltage Threshold value more than value of Voltage Threshold Hysteresis The CONFIGURATION value has been saved in EEPROM IE set new value of CONFIGURATION Press two keys E and then type value of either O or 1 at finish with Enter You can check accuracy of setting by f command get CONFIGURATION If you set CONFIGURATION to O then the DP024 will not restart after recovery and will stay in one of the following states Sleep Over Temperature PSU Overload or Fault till the input voltage 1s off even over temperature or low input voltage error has been recovered gl get Trip Threshold Low Voltage Press four keys g l and Enter As a response the DP024 sends value of Low Voltage Threshold in millivolts The DP024 switches into Sleep PSU Overload or Fault state if input voltage does not exceed Low Voltage Threshold The Low Voltage Threshold value is being stored in EEPROM Gl se
6. of rotation speed revolutions per minute RPM that have been measured for both fans and are separated by symbol slash First value is for the first fan and second for the second fan You can control RPMs for both fans on the fly by sending this command periodically M get firmware release number Press three keys n and Enter As a response the DP024 sends firmware release number p T get table Value of PWM for indicated temperature PWM value for indicated temperature interval T allowed value from 18 C to 60 C should be read from EEPROM and sent to the computer The DP024 makes quantization of parameter T if needed The value of T should be quantized to the nearest smallest integer value down to 3 C For example p 20 command returns matrix value of PWM for temperature interval 18 C 20 is quantized to 18 P T P set new table Value of PWM for indicated temperature New table value of PWM P allowed value is either 0 or value from 40 to 100 for indicated temperature interval T allowed value from 18 to 60 C should be saved EEPROM matrix The DP024 makes quantization of parameters if needed The value of P should be quantized to the nearest smallest integer value down to 5 The value of T should be quantized to the nearest smallest integer value down to 3 C For example P 38 63 command assigns new PWM value 60 63 is quantized to 60 for temperature interval 36 C 38 is quantized to 36 r P get ta
7. 200 correspondingly Even if one of fans has rotation speed lower than pre charted threshold value the DP024 detects it as a fault and defines PWM 100 Thus early diagnostics of fan failure is assured at the time when rotation and cooling ability still is not and air performance are redundant the early diagnostics allows to increase reliability of cooling system essentially while fan speed down at low temperature increases fan life and decreases acoustic noise of the most unreliable and noisy element of modern electronics fan Both tables of matrixes are placed in nonvolatile memory and there are some ways for their corrections if needed The controller matrix can be tuned up to determine individual handling characteristic both for PWM temperature characteristic and for attached fan behaviour in real use environment INPC DP024 Automotive PSU 10 Using the serial line of the DP022 in MS Windows MS Windows XP for example Assume that computer has available COM3 port that should be set as 9600 8 bit no parity 1 stop bit operation As a dialog application let us use Hyper Terminal that is included in MS Windows To get it ready open the folder Communications and run Hyper Terminal click on Start button and then Programs Accessories Communications The dialog window appears on the screen Let us name our connection as PSU arbitrary name Enter a name and choose an icon for the connection Name
8. INPC DP024 90W Smart PSU for Mini ITX Motherboards to be used in an Automotive 19 35Volt Input Environment ALL INFORMATION IN THIS USER MANUAL IS PRELIMINARY AND SUBJECT TO CHANGE R 0 02 December 2008 DV Industrial Computer Ltd Wide input range 19 35V Suitable for automotive applications Suitable for battery powered applications Complete with start up shut down control user adjusted saved in EEPROM Compatible with most Mini ITX boards equipped with a 20pin ATX connector Possibility to control by two standard 12V cooling fans 3 pin Realizes a thermostat by driving heater at temperature lower than 0 C Silent operation fanless Temperature control Low heat dissipation efficiency over 85 Chassis mountable measurements 34x 170x24 Connection via COM port with computer Notice This device should be attached and tuned by specialized personnel only after familiarizing with current manual Please take a moment and read this manual before you install the DP024 in your vehicle Often rushing into installing the unit can result in serious damage to your DP024 converter computer and probably your car electrical system The DP024 converter has several wires that need to be installed in various places When installing always double check the polarity of your wires with a voltmeter and by sight INPC DP024 Automotive PSU 1 Introduction This manual is intended for firmware release 0 02 The firmware release nu
9. V 3 5A 4 0A 5 12V 0 1A 0 15A 10 Total current on 5Vsb and 5V rails Connection NOTICE Do not connect a Car Battery Charger directly to the DP024 The DP024 has several wires that need to be installed in various places When installing always double check the polarity of your wires with a voltmeter NEVER use the cigarette plug as a power source often the contacts are not capable of delivering high current to your PC AT FIRST Connect a 2 pin jumper cable between JP2 and the motherboards Reset header This will allow the DP024 to reset the motherboard by simulating a reset button press POLARITY MATTERS HERE Connect a 2 pin jumper cable between JP3 and the motherboards Power On header This will allow the DP024 to turn on and off the motherboard by simulating a power button press POLARITY MATTERS HERE JP6 is a 10 pin polarized connector that is used for connection via serial line RS 232 to the COM port of the computer The DP024 uses the RTS CTS hardware handshaking of serial line flow control However the DP024 ignores signal on RTS line assuming that control computer is always ready to receive data Therefore really only four wire link is required SG Signal Ground SIN RD Serial Input Read of data SOUT TR Serial Output Transmit of data CTS Clear To Send Connect a 10 pin flat ribbon cable to COM port connector of your control computer RT1 2 pin connector is used to connect remote
10. ate LED Blinks as 0 03sec On 1sec Off The DP024 is waiting for ignition signal The user steps into the automobile and turns on the key IGNITION goes HI 24Volts and as a result the DP024 wakes up from Sleep Mode The DP024 waits for 4 seconds then turns on the 5Vsb rail After another second the DP024 sends an ON signal to the motherboard via the 2 wires connected to the JP3 and to the motherboard s Power On header The motherboard will turn ON and your system should start booting Ignition is ON during driving Your computer will remain ON playing MP3s doing GPS Navigation etc The automobile goes to the gas station and the driver turns off the key and IGNITION goes LOW The DP024 now starts the Countdown Timer T1 The driver gets back in the car starts the car and the computer keeps playing the MP3s without a hiccup The user then drives home and turns off the car for the night IGNITION goes low and the Countdown Timer Tl starts The DP024 waits for STANDBYDELAY then Countdown Timer T1 expires The DP024 then sends a pulse again over JP3 pins to shutdown the computer The shutdown pulse was successful and the computer turned off Standby state The Countdown Timer T2 starts The DP024 waits for SLEEPDELA Y then Countdown Timer T2 expires The DP024 then goes to Sleep state and preserves battery power While in Deep Sleep or Sleep state the DP024 constantly monitors your car battery voltage levels prevent
11. ble Value of threshold RPM for indicated PWM Matrix values of threshold rotation speed RPM revolutions per minute for both fans and for indicated value of pulse width modulation PWM P allowed value of PWM from 40 to 100 should be read from EEPROM and sent to the computer The DP024 makes quantization of parameter P if needed The value of P should be quantized to the nearest smallest integer value down to 5 For example r 99 command returns matrix values of threshold RPM for PWM 95 99 is quantized to 95 The values of RPM are separeted by symbol slash RF PE R set new table Value of threshold RPM for indicated Fan and PWM New table value of threshold rotation speed R revolutions per minute RPM 0 25000 of fan F allowed value either 1 or 2 for indicated value of pulse width modulation allowed value of PWM from 40 to 100 should be saved in EEPROM matrix The DP024 makes quantization of parameters if needed The value of R should be quantized to the nearest smallest integer value down to 100rpm The value of P should be quantized to the nearest smallest integer value down to 5 For example R2 42 1055 command fixes new threshold value 1000rpm 1055 is quantized to 1000 for fan 2 for PWM 40 42 is quantized to 40 INPC DP024 Automotive PSU 16 s get current state Press three keys s and Enter As a response the DP024 sends numeric value that corresponds to current state The correspondence table looks as f
12. capacity will be sufficient in most cases To aid in bench testing it is enough do not connect IGNITION anywhere The DP024 will operate as dumb PSU with button POWER control Ri resistor 10k simulate load in the ignition line of vehicle Because of this resistor the voltage value will less than 0 5V if the Ignition Key is released POWER Key optional POWER IGNITION J Fuse PSU DP024 JR INPC DP024 Automotive PSU 6 In order to connect to 24V vehicle circuit the first you should connect the GND line of the JP1 connector directly to the automotive batteries terminal with heavy gauge wire GND may also be connected with vehicle chassis if desired Then connect the IGNITION pin 2 of JP12 to the switched 24 Volt supply wire ignition circuit or fuse box This will bypass the Startup Shutdown sequence and battery protection At the end connect POWER line of JP1 connector directly to the automotive batteries terminal with heavy gauge wire Apply 24 Volts to IGNITION by turning on the ignition or by flipping a switch and you re ready to go Do not connect IGNITION anywhere if you use the DP024 as a non vehicle PSU In this case the DP024 will operate as dumb PSU Operation VEHICLE MODE If ignition is OFF and the IGNITION signal is LOW about 0 Volts then nothing happens and the DP024 stays in Sleep st
13. circuit between pins 1 and 2 of JP2 connector The WatchDog timer is off after starting of the DP024 To switch it on the command WW should be sent and timeout number of ticks one tick is 0 3 seconds should be set by indicating required W which is a value between O and 255 The driver program needs to set the timeout periodically to avoid the WatchDog hits and following reset contacts closing Detailed information about WatchDog is given in the further sections Fan Control Notice The DP024 PSU drives attached fans from its own 12V output rail Therefore the attached fans can be run only when the DP024 turns on the 12V rail PowerOn state The principle of controller operation is frequent measuring 3 times per second and analysing of airflow temperature and rotation speed of attached fans as well as generating of the voltage applied to the fan according to preliminary charted matrix A typical 12VDC fan has an effective operating voltage range of about 7 to 12V The lowest voltage at which the fan will operate is about 5 to 7V but this may be the lowest voltage at which the fan will run once already spinning The DP024 varies this voltage by step down converter with pulse width modulation PWM to realize linear control Up to 4 fans with nominal voltage 12VDC and with three wires third wire is the fan s tachometer signal could be attached to the controller The DP024 can detect the quantity of attached fans by means of own
14. er of connected fans and their nominal revolution values for all values of PWM and for all corresponding fans voltages Configuring your operating system to be able for safe shutdown standby with control from the DP024 MS Windows XP for example NOTE In order to realize such control ACPI Advanced Configuration and Power Interface should be used that is not a plug and play function If ACPI is not enabled at the time your Mini ITX motherboard is configured you should enable it before your operating system configuring as shown below Go into BIOS SETUP UTILITY usually you have to power up the computer and press the DEL key on keyboard Go to the Power tab then into APM Advanced Power Management option and select Enabled Also select Enabled for HDD Go back into Power tab and select S3 State for ACPI Suspend State If an application you have used or motherboard does not support standby mode then select S1 state Save all changes you have made and exit from BIOS setup utility If ACPI is not enabled at the time OS Windows is installed you should install as shown below Click Start then lt Settings gt and lt Control Panel gt then double click lt Add Remove Hardware gt icon as result let Windows automatically detect ACPI if it is enabled at the time your Mini ITX motherboard BIOS is configured Then install the proper drivers you may need the original Windows CD Reboot the
15. f commands that are supported PSU HyperTerminal Davin Mpaska Ena Besos Nepeaaya Cnpaska DOS 533 De STANDBY OK gt h DPO24 PSU Y0 02 a All display h this Help x fan eXamination b get standBy delay B100 set standBy delay 100s 07255 cb get standBy Counter cs get Sleep timer Counter value fe get slEEp delay E100 set slEEp delay 100s 255 f get conFiguration F set conFiguration O or 1 autostart gl get Low voltaGe threshold G122000 set threshold 22000mY 18000729000 gh get low voltaGe Histeresis Gh2000 set Hysteresis 2000mY O0 S00 m get RPH n get Number of firmware versi p 21 get PWM for 21 C P 18 40 set PWM 40 for 18 C PHM O or 407100 r 45 get RPM for 45 PWM R2 50 908 set RPM 900 for 50 PWM Fan2 1 or 2 s get current Status t get Temperature C Zu get startUp delay U5 set startUp delay 50s 255 y get Volatage mV w get Watchdog value W100 set Watchdog value 100tics 07255 gt Bpema noaknroyenna 0 22 15 9600 8 N 1 If you see this list all settings have been made correct and you can continue with study of commands The commands have friendly interface to interact with terminal program NOTICE The commands that start with symbol slash are focused to be used with dedicated programs of course you can use them with terminal program Some of commands answer with asked value but some of commands do not All answers that have started with symbol are
16. ing deep discharge situations by automatically shutting down until battery levels reach safe levels again DUMB MODE The DP024 behaves as a regular ATX PSU with button Power On Off Of course the DP024 monitors battery voltage to protect against deep discharge and monitors temperature and outputs You can monitor these parameters via serial line in DUMB MODE as well as in VEHICLE MODE Also the WatchDog timer can be used So it seems that the DP024 is not a regular ATX PSU INPC DP024 Automotive PSU 7 DP024 amp LED Status Codes PSU State LED Status Deep Sleep Blink every 2s 0 03s ON 2s OFF 3 Sleep Blink every 2s 0 03s ON 2s OFF StandBy Blink every 1s 0 03s ON 1s OFF PowerOn Blink every 1s 1s ON 0 03s OFF S Sleep Over Temperature Blink every 4s 0 03s ON 4s OFF Sleep PSU Overload or Fault Blink every 4s 0 03s ON 4s OFF Deep Sleep Double Blink every 2s 2x0 03s ON 2s OFF 2 Sleep Double Blink every 2s 2x0 03s ON 2s OFF StandBy Double Blink every 1s 2x0 03s ON 1s OFF PowerOn ON A Sleep Over Temperature Double Blink every 4s 2x0 03s ON 4s OFF Sleep PSU Overload or Fault Double Blink every 4s 2x0 03s ON 4s OFF Serial Line RS232 Notice The DP024 PSU operates completely independent of computer s software and serial line connection The DP024 that is connected to control computer by
17. mber is written on the label stick on the MCU inside the device and also this number can be obtained by a proper command sent through the serial line All registered trademarks are the property of their respective owners Overview The DP024 is a fully compliant ATX power supply designed to power a low power system from a single 24V power source The DP024 power supply has an MCU that controls and monitors various functions of the power supply operation Also it realizes voltages monitoring temperature monitoring and communication via COM port with computer As well the MCU realizes a WatchDog timer to supervise the computer A LED indicator in the power supply continually Battery reports the power system status and health It 19 35 RS232 COM is also used for troubleshooting Tanz Notwithstanding the fact that the DP024 can GND a operate without active cooling it realizes a PowerOn 0 hardware firmware device for a temperature Baten based automatic fanspeed control of two fans y y Reducing of the fan speed as the temperature drops minimizes the system acoustic noise o DP024 T t prolongs fans service life period diminishes yo power consuption The use of two fans that has power logic MCU been controlled by DP024 allows to build a SUI Ss LED A ES 5 Vsb 5V system with redundant cooling facilities and 43 3V 12 12V allows to design fault tolerant system with with hea
18. ollowing Value Status Explanation 0 PowerOn Switched on all rails have been activated 2 StandBy Switched off only 5Vsb rail has been activated 6 Sleep Switched off any rail has not been activated 7 Deep Sleep Switched off any rail has not been activated 8 Sleep Over Temperature Switched off any rail has not been activated 9 Sleep PSU Overload or Fault Switched off any rail has not been activated t get current value of temperature Press three keys t and Enter As a response the DP024 sends two values of temperature that aree separeted by symbol slash First value is measured by remote thermistor second is measured by internal DP024 thermistor You can control temperature on the fly by sending this comand periodically lu get STARTUPDELAY Press three keys u and Enter As a response the DP024 sends current value of STARTUPDELAY value of delay for startup timer in seconds that the DP024 make as pause after input voltage 12V has been applied The STARTUPDELAY value is being stored in EEPROM U set new value of STARTUPDELAY Press two keys E and then type value of seconds from 0 to 255 at finish with Enter You can check accuracy of setting by u command get STARTUPDELA Y lv get current values of input and output voltages Press three keys v and Enter As a response the DP022 sends five values of voltages that are separated by
19. oltage is being applied One should to fully appreciate the fact that the DP024 can define its further mode of operation SOLELY AT THE MOMENT when the supply voltage is being applied and can be switched from the mode to mode by taking off and second applying the supply voltage with prior the IGNITION signal change Later while it is working the DP024 analyses the ignition line of vehicle and controls switching on off logic and powering of the motherboard only if is switched to the VEHICLE MODE If the DP024 has been switched to the DUMB MODE when the supply voltage is being applied then the ignition line has the same action as the POWER button because this line is paralleled for analyse to the POWER button If the Ignition Key is opened then it is the same that the POWER button is pressed but if the Ignition Key is closed then it is the same that the POWER button is released The DP024 can be tested in the lab before being installed into the vehicle The picture shown below explains how to do it and is in use for testing and reseach of the DP024 Certain details need to be noted for proper bench testing When connecting bench power use between 24 to 32 Volts DC to POWER and GND BATTERY terminals for best results The best way to do successful bench testing is to use an adequately sized 24V battery Bringing in the battery from the car or using an extra one that has at least a 10 AmpHour
20. own Therefore second command that can be sent with delay of some time will result in another value with difference that corresponds to delay from first command point les get counter value of T2 timer Press four keys c s and Enter As a response the DP024 sends current value of T2 timer counter in seconds At the moment when the DP024 switches into StandBy state T2 timer starts decrementing counter value count down Therefore second command that can be sent with delay of some time will result in another value with difference that corresponds to delay from first command point le get SLEEPDELAY Press three keys e and Enter As a response the DP024 sends current value of SLEEPDELAY initial value for T2 timer in seconds This value should be loaded into counter of T2 timer when the DP024 switches into StandBy state After that T2 timer starts time countdown The DP024 switches to Sleep state when T2 timer expires The SLEEPDELAY value is being stored in EEPROM E set new value of SLEEPDELAY Press two keys E and then type value of seconds from 0 to 255 at finish with Enter You can check accuracy of setting by e command get SLEEPDELAY If you set SLEEPDELAY to 0 then the DP024 will switch to StandBy state at no time INPC DP024 Automotive PSU 14 f get CONFIGURATION Press three keys f and Enter As a response the DP024 sends current value of CONFIGURATION
21. re the DP024 can act as thermostat EEEEEEEEHH INPC DP024 Automotive PSU 2 when the input voltage is gt predefined value Of course there is a traditional PC PSU mode setting with no ignition control shutdown logic bypassed and it can be used in non vehicle computer applications Input Characteristics Minimum Input Operating voltage 9V 8 5V for less than 0 01sec Maximum Input Operating voltage 25V 30V for less than 0 01sec Maximum Input Current Sleep Mode 20mA Maximum Input Current Deep Sleep Mode 5mA Range of Adjustable Lower Voltage Threshold 9 15V Output Power Characteristics Output Connector ATX Power 20 pin Molex P N 39 01 2200 Maximum Power at 27V Input engine is running Output Rail Current Max Current Peak Regulation lt 5 seconds 5Vsb 6A 8A 3 5V 6A 8A 3 3 3V 6A 8A 3 12V 4A 5A 3 12V 0 1A 0 15A 10 Total current on 5Vsb and 5V rails Maximum Power at 25V Input engine is off Output Rail Current Max Current Peak Regulation lt 5 seconds 5Vsb 6A 7A 4 5V 6A 7A 4 3 3V 6A 7A 4 12V 4A 4 5A 4 12V 0 1A 0 15A 10 Total current on 5Vsb and 5V rails INPC DP024 Automotive PSU 3 Maximum Power at 20V Input engine cranks or deep discharge Output Rail Current Max Current Peak Regulation lt 5 seconds 5Vsb 5A 6A 5 5V 5A 6A 5 3 3V 5A 6A 5 12
22. serial line operates as a terminal device with fixed connection 9600 8 bit no parity 1 stop bit Usually computer acts as initiator of data communication the host The computer can send commands and data to the DP024 The DP024 responds by data block to the most commands sent from computer The DP024 realizes a likeness of ANSI VT100 terminal by means of subset of commands with extensions for WatchDog timer temperature and voltage measurement channel and so on Input from serial line is latched by incoming buffer of 23 byte size String with 24 bytes and more will be wrapped The DP024 starts parsing after receiving of CR 0x0d or LF Ox0a symbol or after overflowing of input buffer 23 bytes Note that parameters such as timeout for the WatchDog timer are in ASCII digits so 12 is represented by the characters 1 and 2 not by a single byte with the value of 12 Also characters are case sensitive so W and w are two different commands INPC DP024 Automotive PSU 8 WatchDog timer The WatchDog timer is designed to overpass a computer hanging up Usually computer almost never hangs up However if it hangs up and gets stuck usually there is nobody at the site to press the reset or nobody knows where the stuck computer is because there were no problem with it for a long time The WatchDog timer is used just for such situations It automatically restarts the computer that is hung up To restart computer the WatchDog timer closes
23. special procedure that will be described further The range of measured temperature from 18 to 60 C is quantized by 3 C intervals Each interval is associated with PWM value of step down converter The value of PWM that is associated with temperature interval could be changed and regulation curve could be mould individually The content of such matrix with pre charted by producer default values is given below T C lt 18 lt 21 lt 24 lt 27 lt 30 lt 33 lt 36 lt 39 lt 42 lt 45 lt 48 lt 51 lt 54 lt 57 lt 60 PWM 45 45 45 45 50 55 60 65 70 75 80 85 90 95 100 INPC DP024 Automotive PSU 9 The figure below that explains fan control shows how the measured value of temperature 36 C addresses the row of matrix with PWM 60 2200 1300 2000 TEMPERATURE TO PWM MATRIX TRANSDUCER PWM TO THRESHOLE RPM MATRIX RPM PWM POWER 12V PWM VOLTAGI REGULATOR VAR 5 12V Fan1 lost but fault has been detected and signalized If quantity of fans PWM value determines fan voltage and finally the rotation speed Measured values are compared with tabulated points individually for each fan Normally functioning fan should not have the rotation speeds lower than threshold matrix values In presented example the measured value of temperature 36 C and PWM value 60 determine the threshold rotation values for 1 and 2 fan as 1400 and 2
24. t new value of Trip Threshold Low Voltage Press keys G1 and then type value of millivolts from 18000 to 29000 and finish with Enter You can check accuracy of setting by gl command get Lower Voltage Threshold gh get Trip Threshold Low Voltage Hysteresis Press four keys g h and Enter As a response the DP024 sends value of Voltage Threshold Hysteresis in millivolts In case if the DP024 has been switched to Sleep PSU Overload or Fault state and this error was caused by dropping of input voltage below Low Voltage Threshold value and if the input voltage stays less than sum of Low Voltage Threshold and Voltage Threshold Hysteresis the DP024 will stay in Sleep PSU Overload or Fault state If input voltage rises over sum of Trip Threshold Low Voltage and Trip Threshold Low Voltage Hysteresis the DP024 will switch into StandBy state The Trip Threshold Low Voltage Hysteresis value is being stored in EEPROM Gh set new value of Trip Threshold Low Voltage Hysteresis Press keys G h and then type value of millivolts from 500 to 5000 and finish with Enter You can check accuracy of setting by gh command get Trip Threshold Low Voltage Hysteresis h get list of commands Press two keys h and Enter As a response the DP024 sends firmware release number and list of commands INPC DP024 Automotive PSU 15 m get current Value of Rotation Speed for both Fans Press three keys m and Enter As a response the DP024 sends two values
25. tailed with symbol carriage return line feed and prompt symbol gt a display all Press two keys a and Enter As a response the DP024 sends current value of temperature output voltages input voltage value of Trip Threshold Low Voltage contents and initial values of Timers T1 and T2 current state of operating fan revolution values and so on for the moment when the command has been sent INPC DP024 Automotive PSU 13 b get STANDBYDELAY Press three keys b and Enter As a response the DP024 sends current value of STANDBYDELAY initial value for T1 timer in seconds This value should be loaded into counter of T1 timer when IGNITION goes low After that T1 timer starts time countdown The DP024 switches to StandBy state when T1 timer expires The STANDBYDELAY value has been saved in EEPROM B set new value of STANDBYDELAY Press keys B and then type value of seconds from 0 to 255 and finish with Enter You can check accuracy of setting by b command get STANDBYDELAY If you set STANDBYDELAY to 0 then the DP024 will switch to StandBy state immediately after circuit IGNITION has gone low cb get counter value of T1 timer Press four keys c b and Enter As a response the DP024 sends current value of T1 timer counter in seconds At the moment when IGNITION goes low while the DP024 is being in PowerOn state T1 timer starts decrementing counter value count d
26. ting There are four main working states of the DP024 Deep Sleep Sleep Standby Power On The DP024 has user selectable MCU driven timing settings Motherboard allowing you to choose various ignition shutdown vehicle computer timing schemes settings These settings are user adjusted and saved in EEPROM These settings allow to overcome the main problems of vehicle computer power supplying One of most difficult tasks of operating a computer in a vehicle is power consumption while the computer is OFF Even if your computer is totally OFF Standby state a computer will still consume a few hundred milliwatts needed to monitor computer ON OFF status All power supplies provide 5Vsb SV standby so that the motherboard can issue at least a PSON signal When the computer is in the suspend sleep mode it will consume even more power because the RAM needs to be powered at all times The power consumption in the suspend mode is few Watts No matter how big your car battery is it will eventually drain your vehicle battery in a matter of days The DP024 is addressing these issues by cutting off the SVSB rail after a pre defined amount of time timing settings The DP024 monitors battery voltage to protect against deep discharge When battery level drops below predefined value for more than predefined time the DP024 will shut down and re activate only ON OFF RESET 20pin ATX connector witch switch long life performance For operating at low temperatu
27. tomotive PSU e D4 lt JPL INPUT POWER Pin Description 1 POWER CG 2 IGNITION GND BATTERY C JPle O POWER BUTTON Pin Description R BIN Op oO AT THE END Connect the ground IGNITION and 24 Volt supply JP1 One should to fully appreciate the function of the IGNITION signal pin 2 At the moment immediately after 24V supply voltage was applied a battery was connected the DP024 analyses the value of this signal If the IGNITION signal is lower than 0 5V then the DP024 will switch to the VEHICLE MODE Else if the IGNITION signal is higher than 3V at the moment when the supply voltage was applied the DP024 will switch to the DUMB MODE You should eliminate the situation when this voltage is between 0 5 3V as not defined because the DP024 will define mode not stable The DP024 has build in pull up of the IGNITION signal therefore in order to switch to the DUMB MODE you may leave the IGNITION signal free and do not connect it at the moment when the supply voltage is being applied And vice versa in order to switch to the VEHICLE MODE you must keep the IGNITION signal closed to the ground or GND pin 3 of JP1 or provide the IGNITION signal voltage level less than 0 5V by corresponding current load at the moment when the supply v
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