LTC具温度电压和电流测量功能的多节电池电量测量芯片

1、LTC2943-具温度、电压和电流测量功能的多节电池电量测量芯片特点可测量累积的电池充电和放电电量至20V工作范围可适合多种电池应用14位ADC负责测量电池电压、电流和温度1%电压、电流和充电准确度=t50mV检测电压范围高压侧检测适合任何电池化学组成和容量的通用测量I2C/SMBus接口可配置警报输出/充电完成输入静态电流小于120卩A小外形8引脚3mmx3mmDFN圭寸装典型应用3.3VCHARGERDD卩P2kLTC2943SENSE+ALCCSDASENSE-SCLGNDTMULTICElI三LI-ION1ALOADTotalChargeErrorvsDifferentialSense

2、VoltageOJ110100sense(mV)294aTAOIt描述LTC?2943?可测量便携式产品应用中的电池充电状态、电池电压、电池电流及其自身温度。其具有宽输入电压范围，因而可与高达？20V?的多节电池配合使用。一个精准的库仑计量器负责对流经位于电池正端子和负载或充电器之间的一个检测电阻器电流进行积分运算。电池电压、电流和温度利用一个内部?14位无延迟增量累加？(NoLatency男)ADC?来测量。测量结果被存储于可通过内置?I2C/SMBus?接口进行存取的内部寄存器中。LTC2943?具有针对所有？4?种测量物理量的可编程高门限和低门限。如果超过了某个编程门限，则该器件将采用？

3、SMBus?警报协议或通过在内部状态寄存器中设定一个标记来传送警报信号。LTC2943?仅需采用单个低阻值检测电阻器以设定测量电流范围。应用电动工具电动自行车便携式医疗设备视频摄像机程序：#inelude<>#inelude<>#include""#include""#include""#include""#include""#include<>00;CheckI2CAddress."Sharedbetweenloop()andrestore_ale

4、rt_settings().nPleaseensureI2ClinesofLinduinoareconnectedtotheLTCdevice");(ack_error);(F("*");print_prompt();*n");(F("*Setthebaudrateto115200andselectthenewlineterminator.*n");(F("*n");n");int8_tmenu_1_automatic_mode(int8_tmAh_or_Coulombs,int8_tcelcius_or

5、_kelvin,uint16_tprescalar_mode,uint16_tprescalarValue,uint16_talcc_mode)0=acknowledge,1=8_tLTC2943_mode;int8_tack=0;LTC2943_mode=LTC2943_AUTOMATIC_MODE|prescalar_mode|alcc_mode;();ack|=LTC2943_write(LTC2943_I2C_ADDRESS,LTC2943_CONTROL_REG,LTC2943_mode);("Coulombs:");(charg

6、e,4);(F("Cn");elsecharge=LTC2943_code_to_mAh(charge_code,resistor,prescalarValue);("mAh:");(charge,4);(F("mAhn");current=LTC2943_code_to_current(current_code,resistor);IfanAlerthasbeenset,printoutappropriatemessageintheSerialPrompt.(F("m-MainMenunn");();delay(

7、AUTOMATIC_MODE_DISPLAY_DELAY);read_int();0=acknowledge,1=noacknowledgeint8_tLTC2943_mode;int8_tack=0;LTC2943_mode=LTC2943_SCAN_MODE|prescalar_mode|alcc_mode;();ack|=LTC2943_write(LTC2943_I2C_ADDRESS,LTC2943_CONTROL_REG,LTC2943_mode);("Coulombs:");(charge,4);(F("Cn");elsecharge=LT

8、C2943_code_to_mAh(charge_code,resistor,prescalarValue);("mAh:");(charge,4);(F("mAhn");current=LTC2943_code_to_current(current_code,resistor);(F("Temperature");(temperature,4);(F("Kn");elsetemperature=LTC2943_code_to_celcius_temperature(temperature_code);(F(&qu

9、ot;Temperature");(temperature,4);(F("Cn");checkAlerts(status_code);IfanAlerthasbeenset,printoutappropriatemessageintheSerialPrompt(F("m-MainMenunn");();delay(SCAN_MODE_DISPLAY_DELAY);while()=false|(ack);read_int();0=acknowledge,1=noacknowledgeint8_tLTC2943_mode;int8_tack=0;L

10、TC2943_mode=LTC2943_MANUAL_MODE|prescalar_mode|alcc_mode;();ack|=LTC2943_write(LTC2943_I2C_ADDRESS,LTC2943_CONTROL_REG,LTC2943_mode);Whensetto1itindicatesthatstaledataisbeingreadfromthevoltage,currentandtemperatureregisters.do(F(F(H*nn");uint8_tstatus_code;uint16_tcharge_code,current_code,volta

11、ge_code,temperature_code;("Coulombs:");ack|=LTC2943_read_16_bits(LTC2943_I2C_ADDRESS,LTC2943_ACCUM_CHARGE_MSB_REG,&charge_code);(charge,4);(F("Cn");elsecharge=LTC2943_code_to_mAh(charge_code,resistor,prescalarValue);("mAh:");(charge,4);(F("mAhn");current=L

12、TC2943_code_to_current(current_code,resistor);else("");(F("Voltage");(voltage,4);(F("V");if(staleData)(F("*StaleData*n");else("");if(celcius_or_kelvin)temperature=LTC2943_code_to_kelvin_temperature(temperature_code);(F("Temperature");(tempe

13、rature,4);(F("K");elsetemperature=LTC2943_code_to_celcius_temperature(temperature_code);(F("Temperature");(temperature,4);(F("C");if(staleData)(F("*StaleData*n");else("");checkAlerts(status_code);IfanAlerthasbeenset,printoutappropriatemessageintheSer

14、ialPrompt(F("m-MainMenunn");staleData=1;();delay(AUTOMATIC_MODE_DISPLAY_DELAY);while()=false|(ack);read_int();0=acknowledge,1=noacknowledgeint8_tLTC2943_mode;int8_tack=0;LTC2943_mode=LTC2943_SLEEP_MODE|prescalar_mode|alcc_mode;();ack|=LTC2943_write(LTC2943_I2C_ADDRESS,LTC2943_CONTROL_REG,L

15、TC2943_mode);("Coulombs:");(charge,4);(F("Cn");elsecharge=LTC2943_code_to_mAh(charge_code,resistor,prescalarValue);("mAh:");(charge,4);(F("mAhn");(F("Current");(F("ADCSleep.n");(F("Voltage");(F("ADCSleep.n");(F("Tem

16、perature");(F("ADCSleep.n");(F("m-MainMenunn");checkAlerts(status_code);();delay(AUTOMATIC_MODE_DISPLAY_DELAY);while()=false|(ack);read_int();0=acknowledge,1=noacknowledgeint8_tack=0;ack|=LTC2943_write(LTC2943_I2C_ADDRESS,LTC2943_CONTROL_REG,LTC2943_SHUTDOWN_MODE);0=acknowle

17、dge,1=noacknowledgeint8_tack=0;int8_tuser_command;do(F(F(H*nn");(F("1-SetAlertThresholdsn");(F("2-SetPrescalarValuen");(F("3-SetAL#/CC#PinStaten");(F("4-SetUnitsn");(F("m-MainMenunn");(F("Enteracommand:");user_command=read_int();if(use

18、r_command='m')("m");else(user_command);();switch(user_command)case1:ack|=menu_6_settings_menu_1_set_alert_thresholds();0=acknowledge,1=noacknowledgeint8_tack=0;int8_tuser_command;do(F(F(H*nn");(F("1-SetChargeThresholdsn");(F("2-SetVoltageThresholdsn");(F(&q

19、uot;3-SetCurrentThresholdsn");(F("4-SetTemperatureThresholdsn");(F("m-MainMenunn");(F("Enteracommand:");user_command=read_int();if(user_command='m')("m");else(user_command);();switch(user_command)case1:ack|=menu_6_alert_menu_1_set_charge_threshold

20、s();TheACRchargelsbsizechangeswithrespecttotheprescalarandsenseresistorvalue.Duetothisvariability,forthepurposeofthisdemoentervaluesinhexadecimal.break;case2:ack|=menu_6_alert_menu_2_set_voltage_thresholds();EnterValuesinVoltsbreak;case3:ack|=menu_6_alert_menu_3_set_current_thresholds();EnterValuesi

21、nAmperes.break;case4:ack|=menu_6_alert_menu_4_set_temperature_thresholds();EnterValuesinCelcius.break;default:if(user_command!='m')("IncorrectOption");break;while(!(user_command='m')|(ack);return(ack);0=acknowledge,1=noacknowledgeint8_tack=0;(F("EnterRAWMaxChargeThresh

22、old:");uint16_tmax_charge_threshold;max_charge_threshold=read_int();0=acknowledge,1=noacknowledgeint8_tack=0;(F("EnterMaxVoltageThreshold:");floatmax_voltage_threshold;max_voltage_threshold=read_float();ack|=LTC2943_write_16_bits(LTC2943_I2C_ADDRESS,LTC2943_VOLTAGE_THRESH_HIGH_MSB_REG

23、,max_voltage_threshold_code);ack|=LTC2943_write_16_bits(LTC2943_I2C_ADDRESS,LTC2943_VOLTAGE_THRESH_LOW_MSB_REG,min_voltage_threshold_code);0=acknowledge,1=noacknowledgeint8_tack=0;(F("EnterMaxCurrentThreshold:");floatmax_current_threshold;max_current_threshold=read_float();ack|=LTC2943_wri

24、te_16_bits(LTC2943_I2C_ADDRESS,LTC2943_CURRENT_THRESH_HIGH_MSB_REG,max_current_threshold_code);ack|=LTC2943_write_16_bits(LTC2943_I2C_ADDRESS,LTC2943_CURRENT_THRESH_LOW_MSB_REG,min_current_threshold_code);0=acknowledge,1=noacknowledgeint8_tack=0;(F("EnterMaxTemperatureThresholdinCelcius:")

25、;floatmax_temperature_threshold;max_temperature_threshold=read_float();ack|=LTC2943_write_16_bits(LTC2943_I2C_ADDRESS,LTC2943_TEMPERATURE_THRESH_HIGH_REG,max_temperature_threshold_code);ack|=LTC2943_write_16_bits(LTC2943_I2C_ADDRESS,LTC2943_TEMPERATURE_THRESH_LOW_REG,min_temperature_threshold_code);

26、0=acknowledge,1=noacknowledgeint8_tack=0;int8_tuser_command;do(F(F(H*nn");(F("1-SetPrescalarM=1n");(F("2-SetPrescalarM=4n");(F("3-SetPrescalarM=16n");(F("4-SetPrescalarM=64n");(F("5-SetPrescalarM=256n");(F("6-SetPrescalarM=1024n");(F(&

27、quot;7-SetPrescalarM=4096n");(F("m-MainMenunn");(F("Enteracommand:");user_command=read_int();if(user_command='m')("m");else(user_command);();switch(user_command)case1:*prescalar_mode=LTC2943_PRESCALAR_M_1;0=acknowledge,1=noacknowledgeint8_tack=0;int8_tuser_

28、command;do(F(H*nn");(F("1-EnableAlertModen");(F("2-EnableChargeCompleteModen");(F("3-DisableAL#/CC#Pinn");(F("m-MainMenunn");(F("Enteracommand:");user_command=read_int();if(user_command='m')("m");else(user_command);();switch(us

29、er_command)case1:(F("nAL#/CC#*alcc_mode=LTC2943_ALERT_MODE;PinDisabledn");break;default:if(user_command!='m')("IncorrectOption");break;while(!(user_command='m')|(ack);return(ack);0=acknowledge,1=noacknowledgeint8_tack=0;int8_tuser_command;do(F(F(H*nn");(F(&qu

30、ot;1-SetChargeUnitstomAhn");(F("1-SetChargeUnitstomAhn");(F("2-SetChargeUnitstoCoulombsn");(F("3-SetTemperatureUnitstoCelciusn");(F("4-SetTemperatureUnitstoKelvinn");(F("m-MainMenunn");(F("Enteracommand:");user_command=read_int();if(us

31、er_command='m')("m");else(user_command);();switch(user_command)case1:*mAh_or_Coulombs=0;(F("nChargeUnitsSettomAhn");break;case2:*mAh_or_Coulombs=1;(F("nChargeUnitsSettoCoulombsn");break;case3:*celcius_or_kelvin=0;(F("nTemperatureUnitsSettoCelciusn");break;case4:*celcius_or_kelvin=1;(F("nTemperatureUnitsSettoKelvinn");break;default:if(user_command!='m')("IncorrectOption");break;while(!(user_command='m')|(ack);return(ack);booli