LTC具溫度電壓和電流測量功能的多節(jié)電池電量測量芯片

1、LTC2943 -具溫度、電壓和電流測量功能的多節(jié)電池電量測量芯片特點可測量累積的電池充電和放電電量3.6V至20V工作范圍可適合多種電池應(yīng)用14位ADC負責測量電池電壓、電流和溫度1%電壓、電流和充電準確度±50mV檢測電壓范圍高壓側(cè)檢測適合任何電池化學組成和容量的通用測量I2C / SMBus 接口 可配置警報輸出/充電完成輸入靜態(tài)電流小于 120卩A小外形8引腳3mm x 3mm DFN圭寸裝典型應(yīng)用描述LTC ?2943?可測量便攜式產(chǎn)品應(yīng)用中的電池充電狀態(tài)、電池電壓、電池電流及其自身溫度。其具有寬輸入電壓范圍，因而可與高達？20V?的多節(jié)電池配合使用。一個精準的庫侖計量器負

2、責對流經(jīng)位于電池正端子和負載或充電器之間的一個檢測電阻器電流進行積分運算。電池電壓、電流和溫度利用一個內(nèi)部?14位無延遲增量累加?(No Latency 男)ADC?來測量。測量結(jié)果被存儲于可通過內(nèi)置?I2C / SMBus?接口進行存取的內(nèi)部寄存器中。LTC2943?具有針對所有？4?種測量物理量的可編程高門限和低門限。如果超過了某個編程門限，則該器件 將采用？SMBus?警報協(xié)議或通過在內(nèi)部狀態(tài)寄存器中設(shè)定一個標記來傳送警報信號。LTC2943?僅需采用單個低阻值檢測電阻器以設(shè)定測量電流范圍。應(yīng)用電動工具電動自行車便攜式醫(yī)療設(shè)備視頻攝像機程序：#include <Arduino.h&

3、gt;#include <stdint.h>#include "Linduino.h"#include "LT_I2C.h"#include "UserInterface.h"#include "QuikEval_EEPROM.h"#include "LTC2943.h"#include <Wire.h>/ Function Declarationvoid print_title();/ Print the title blockvoid print_prompt();/

4、 Print the Promptvoid store_alert_settings();/ Store the alert settings to theEEPROMint8_t restore_alert_settings(); / Read the alert settings fromEEPROM#define AUTOMATIC_MODE_DISPLAY_DELAY 1000/!< Thedelay between readings in automatic mode#define SCAN_MODE_DISPLAY_DELAY 10000 /!< The delay b

5、etween readings in scan modeconst float resistor = .100;/!<resistor value on demo board/ Error stringconst char ack_error = "Error: No Acknowledge. Check I2C Address."/!< Error message/ Global variablesstatic int8_t demo_board_connected;/!< Set to 1 if the boardis connectedstatic

6、uint8_t alert_code = 0;/!< Value stored or readfrom ALERT register. Shared between loop() and restore_alert_settings()/! Initialize Linduinovoid setup()char demo_name = "DC1812" /! Demo Board Name stored in QuikEval EEPROMquikeval_I2C_init();/! Configure the EEPROM I2C portfor 100kHzqui

7、keval_I2C_connect();/! Connects to main I2C portSerial.begin(115200);/! Initialize the serial port tothe PCprint_title();demo_board_connected = discover_demo_board(demo_name);if (demo_board_connected)print_prompt();elsedemo_board_connected = true;Serial.println("Did not read ID String, attempti

8、ng to proceed anyway.nPlease ensure I2C lines of Linduino are connected to the LTC device");/! Repeats Linduino loopvoid loop()/! I2C acknowledge/! The user inputint8_t ack = 0; indicatorstatic uint8_t user_command; commandstatic uint8_t mAh_or_Coulombs = 0;static uint8_t celcius_or_kelvin = 0;

9、static uint16_t prescalar_mode = LTC2943_PRESCALAR_M_4096;static uint16_t prescalarValue = 4096;static uint16_t alcc_mode = LTC2943_ALERT_MODE;if (demo_board_connected) demo board is not connectedif (Serial.available() serial is not availableuser_command = read_int(); commandif (user_command != '

10、;m')Serial.println(user_command);Serial.println();ack = 0;switch (user_command) appropriate submenu/! Do nothing if the/! Do nothing if/! Read user input/! Prints thecase 1:ack |= menu_1_automatic_mode(mAh_or_Coulombs, celcius_or_kelvin, prescalar_mode, prescalarValue, alcc_mode); /! Automatic M

11、odebreak;case 2:ack |= menu_2_scan_mode(mAh_or_Coulombs, celcius_or_kelvin, prescalar_mode, prescalarValue, alcc_mode); /! Scan Modebreak;case 3:ack |= menu_3_manual_mode(mAh_or_Coulombs, celcius_or_kelvin, prescalar_mode, prescalarValue, alcc_mode); /! Manual Modebreak;case 4:ack |= menu_4_sleep_mo

12、de(mAh_or_Coulombs, prescalar_mode, prescalarValue, alcc_mode); /! Sleep Modebreak;case 5:ack |= menu_5_shutdown_mode();/! Shutdown Modebreak;case 6:ack |= menu_6_settings(&mAh_or_Coulombs, &celcius_or_kelvin, &prescalar_mode, &prescalarValue, &alcc_mode); /! Settings Modebreak;i

13、f (ack != 0)/! If ack is not recieved print an error.Serial.println(ack_error);Serial.print(F(" *");print_prompt();/ Function Definitions/! Print the title blockvoid print_title()Serial.println(F("n *");Serial.print(F("* DC1812A Demonstration Program*n");Serial.print(F(

14、"*n");Serial.print(F("* This program communicates with the LTC2943Multicell Coulomb *n");Serial.print(F("* Counter found on the DC1812A demo board. *n");Serial.print(F("* Set the baud rate to 115200 and select the newline terminator.*n");Serial.print(F("*

15、n");Serial.print(F(" * n");/! Print the Promptvoid print_prompt()Serial.print(F("n1-Automatic Moden");Serial.print(F("3-Manual Moden");Serial.print(F("4-Sleep Moden");Serial.print(F("5-Shutdown Moden");Serial.print(F("6-Settingsn");Ser

16、ial.print(F("Enter a command: ");/! Automatic M8_t menu_1_automatic_mode(int8_t mAh_or_Coulombs, int8_t celcius_or_kelvin ,uint16_t prescalar_mode, uint16_t prescalarValue, uint16_t alcc_mode)/! return Returns the state of the acknowledge bit after the I2C address write. 0=acknowled

17、ge, 1=no 8_t LTC2943_mode;int8_t ack = 0;LTC2943_mode = LTC2943_AUTOMATIC_MODE|prescalar_mode|alcc_mode ; /! Set the control register of the LTC2943 to automatic mode as well as set prescalar and AL#/CC# pin values.Serial.println();ack |= LTC2943_write(LTC2943_I2C_ADDRESS, LTC2943_CON

18、TROL_REG, LTC2943_mode); /! Writes the set mode to the LTC2943 control registerdoSerial.print(F("*nn");uint8_t status_code, hightemp_code, lowtemp_code;uint16_t charge_code, current_code, voltage_code, temperature_code;ack |= LTC2943_read_16_bits(LTC2943_I2C_ADDRESS, LTC2943_ACCUM_CHARGE_M

19、SB_REG, &charge_code); /! Read MSB and LSB Accumulated Charge Registers for 16 bit charge codeack |= LTC2943_read_16_bits(LTC2943_I2C_ADDRESS, LTC2943_VOLTAGE_MSB_REG, &voltage_code);/! Read MSB and LSBVoltage Registers for 16 bit voltage codeack |= LTC2943_read_16_bits(LTC2943_I2C_ADDRESS,

20、LTC2943_CURRENT_MSB_REG, &current_code); /! Read MSB and LSB Current Registers for 16 bit current codeack |= LTC2943_read_16_bits(LTC2943_I2C_ADDRESS, LTC2943_TEMPERATURE_MSB_REG, &temperature_code); /! Read MSB and LSB Temperature Registers for 16 bit temperature codeack |= LTC2943_read(LTC

21、2943_I2C_ADDRESS, LTC2943_STATUS_REG, &status_code);/! Read Status Register for 8bit status codefloat charge, current, voltage, temperature;if(mAh_or_Coulombs)charge = LTC2943_code_to_coulombs(charge_code, resistor, prescalarValue); /! Convert charge code to Coulombs if Coulomb units are desired

22、.Serial.print("Coulombs: ");Serial.print(charge, 4);Serial.print(F(" Cn");elsecharge = LTC2943_code_to_mAh(charge_code, resistor, prescalarValue); /! Convert charge code to mAh if mAh units are desired.Serial.print(charge, 4);Serial.print(F(" mAhn");current = LTC2943_co

23、de_to_current(current_code, resistor);/! Convert current code to Amperesvoltage = LTC2943_code_to_voltage(voltage_code);/! Convert voltage code to VoltsSerial.print(F("Current ");Serial.print(current, 4);Serial.print(F(" An");Serial.print(F("Voltage ");Serial.print(volt

24、age, 4);Serial.print(F(" Vn");if(celcius_or_kelvin)temperature =LTC2943_code_to_kelvin_temperature(temperature_code); /! Convert temperature code to kelvinSerial.print(F("Temperature ");Serial.print(temperature, 4);Serial.print(F(" Kn");elsetemperature =LTC2943_code_to_

25、celcius_temperature(temperature_code); /! Convert temperature code to celciusSerial.print(F("Temperature ");Serial.print(temperature, 4);Serial.print(F(" Cn");checkAlerts(status_code);/! Check status code for Alerts. If an Alert has been set, print out appropriate message in the

26、Serial Prompt.Serial.print(F("m-Main Menunn");Serial.flush();delay(AUTOMATIC_MODE_DISPLAY_DELAY);/! Delay for 1s before next pollingwhile (Serial.available() = false | (ack);/! if Serial is not available and an NACK has not been recieved, keep polling the registers.read_int(); / clears the

27、 Serial.availablereturn(ack);/! Scan Modeint8_t menu_2_scan_mode(int8_t mAh_or_Coulombs , int8_t celcius_or_kelvin ,uint16_t prescalar_mode,uint16_t prescalarValue, uint16_t alcc_mode)/! return Returns the state of the acknowledge bit after the I2C address write. 0=acknowledge, 1=no acknowledgeint8_

28、t LTC2943_mode;int8_t ack = 0;LTC2943_mode = LTC2943_SCAN_MODE|prescalar_mode|alcc_mode ; /! Set the control mode of the LTC2943 to scan mode as well as set prescalar and AL#/CC# pin values.ack |= LTC2943_write(LTC2943_I2C_ADDRESS, LTC2943_CONTROL_REG, LTC2943_mode); /! Writes the set mode to the LT

29、C2943 control registerdoSerial.print(F("*nn");uint8_t status_code;uint16_t charge_code, current_code, voltage_code, temperature_code;/! Read MSB andack |= LTC2943_read_16_bits(LTC2943_I2C_ADDRESS, LTC2943_ACCUM_CHARGE_MSB_REG, &charge_code); LSB Accumulated Charge Registers for 16 bit

30、charge codeack |= LTC2943_read_16_bits(LTC2943_I2C_ADDRESS, LTC2943_VOLTAGE_MSB_REG, &voltage_code);/! Read MSB andLSB Voltage Registers for 16 bit voltage codeack |= LTC2943_read_16_bits(LTC2943_I2C_ADDRESS, LTC2943_CURRENT_MSB_REG, &current_code);/! Read MSB andLSB Current Registers for 16

31、 bit current codeack |= LTC2943_read_16_bits(LTC2943_I2C_ADDRESS, LTC2943_TEMPERATURE_MSB_REG, &temperature_code); /! Read MSB and LSB Temperature Registers for 16 bit temperature codeack |= LTC2943_read(LTC2943_I2C_ADDRESS, LTC2943_STATUS_REG, &status_code);/! Read Status Registers for8 bit

32、 status codefloat charge, current, voltage, temperature;if(mAh_or_Coulombs)charge = LTC2943_code_to_coulombs(charge_code, resistor, prescalarValue); /! Convert charge code to Coulombs if Coulomb units are desired.Serial.print("Coulombs: ");Serial.print(F(" Cn");elsecharge = LTC29

33、43_code_to_mAh(charge_code, resistor, prescalarValue); /! Convert charge code to mAh if mAh units are desired.Serial.print("mAh: ");Serial.print(charge, 4);Serial.print(F(" mAhn");current = LTC2943_code_to_current(current_code, resistor); /! Convert current code to Amperesvoltage

34、 = LTC2943_code_to_voltage(voltage_code);/! Convert voltage code to VoltsSerial.print(F("Current ");Serial.print(current, 4);Serial.print(F(" An");Serial.print(F("Voltage ");Serial.print(voltage, 4);Serial.print(F(" Vn");if(celcius_or_kelvin)temperature = LTC2

35、943_code_to_kelvin_temperature(temperature_code); /! Convert temperature code to Kelvin if Kelvin units are desired.Serial.print(F("Temperature ");Serial.print(temperature, 4);Serial.print(F(" Kn");elsetemperature = LTC2943_code_to_celcius_temperature(temperature_code);/! Convert

36、 temperature code to Celcius if Celcius units are desired. Serial.print(F("Temperature ");Serial.print(temperature, 4); Serial.print(F(" Cn"); checkAlerts(status_code);/! Check status code for Alerts. If an Alert has been set, print out appropriate message in the Serial PromptSer

37、ial.print(F("m-Main Menunn");Serial.flush(); delay(SCAN_MODE_DISPLAY_DELAY);while (Serial.available() = false | (ack); read_int(); / clears the Serial.available return(ack);/! Manual Mode int8_t menu_3_manual_mode(int8_t mAh_or_Coulombs ,int8_t celcius_or_kelvin ,uint16_t prescalar_mode, u

38、int16_t prescalarValue, uint16_t alcc_mode) /! return Returns the state of the acknowledge bit after the I2C address write. 0=acknowledge, 1=no acknowledgeint8_t LTC2943_mode;int8_t ack = 0;LTC2943_mode = LTC2943_MANUAL_MODE|prescalar_mode|alcc_mode ;/! Set the control mode of the LTC2943 to manual

39、mode as well as set prescalar and AL#/CC# pin values.Serial.println();ack |= LTC2943_write(LTC2943_I2C_ADDRESS, LTC2943_CONTROL_REG, LTC2943_mode); /! Writes the set mode to the LTC2943 control registerint staleData = 0;/! Stale Data Check variable. When set to 1 it indicates that stale data is bein

40、g read from the voltage, current and temperature registers.doSerial.print(F("*nn");uint8_t status_code;uint16_t charge_code, current_code, voltage_code, temperature_code;ack |= LTC2943_read_16_bits(LTC2943_I2C_ADDRESS, LTC2943_ACCUM_CHARGE_MSB_REG, &charge_code);/! Read MSB andLSB Accu

41、mulated Charge Registers for 16 bit charge codeack |= LTC2943_read_16_bits(LTC2943_I2C_ADDRESS, LTC2943_VOLTAGE_MSB_REG, &voltage_code);/! Read MSB andLSB Voltage Registers for 16 bit voltage codeack |= LTC2943_read_16_bits(LTC2943_I2C_ADDRESS, LTC2943_CURRENT_MSB_REG, &current_code); /! Rea

42、d MSB and LSB Current Registers for 16 bit current codeack |= LTC2943_read_16_bits(LTC2943_I2C_ADDRESS, LTC2943_TEMPERATURE_MSB_REG, &temperature_code); /! Read MSB and LSB Temperature Registers for 16 bit temperature codeack |= LTC2943_read(LTC2943_I2C_ADDRESS, LTC2943_STATUS_REG, &status_c

43、ode); /! Read Status Registers for8 bit status codefloat charge, current, voltage, temperature;if(mAh_or_Coulombs)charge = LTC2943_code_to_coulombs(charge_code, resistor, prescalarValue);/! Convert charge codeto Coulombs if Coulomb units are desired.Serial.print("Coulombs: ");Serial.print(

44、charge, 4);Serial.print(F(" Cn");elsecharge = LTC2943_code_to_mAh(charge_code, resistor, prescalarValue); /! Convert charge code to mAh if mAh units are desired.Serial.print("mAh: ");Serial.print(charge, 4);Serial.print(F(" mAhn");current = LTC2943_code_to_current(curre

45、nt_code, resistor);/! Convert current code to Amperesvoltage = LTC2943_code_to_voltage(voltage_code);/! Convert voltage code to VoltsSerial.print(F("Current ");Serial.print(current, 4);Serial.print(F(" A");if(staleData) Serial.print(F(" * Stale Data *n");/! If Stale dat

46、a is inside the register after initial snapshot, Print Stale Data message.else Serial.println("");Serial.print(F("Voltage ");Serial.print(voltage, 4);Serial.print(F(" V");if(staleData) Serial.print(F(" * Stale Data *n");/! If Stale data is inside the register

47、after initial snapshot, Print Stale Data message.else Serial.println("");if(celcius_or_kelvin)temperature = LTC2943_code_to_kelvin_temperature(temperature_code); /! Convert temperature code to Kelvin if Kelvin units are desired.Serial.print(F("Temperature ");Serial.print(temperat

48、ure, 4);Serial.print(F(" K");elsetemperature = LTC2943_code_to_celcius_temperature(temperature_code); /! Convert temperature code to Celcius if Celcius units are desired.Serial.print(F("Temperature ");Serial.print(temperature, 4);Serial.print(F(" C");if(staleData) Seria

49、l.print(F(" * Stale Data *n");else Serial.println(""); checkAlerts(status_code);/! Check status code for Alerts. If an Alert has been set, print out appropriate message in the Serial PromptSerial.print(F("m-Main Menunn");staleData = 1;Serial.flush(); delay(AUTOMATIC_MOD

50、E_DISPLAY_DELAY);while (Serial.available() = false | (ack);read_int(); / clears the Serial.available return(ack);/! Sleep Modeint8_t menu_4_sleep_mode(int8_t mAh_or_Coulombs ,uint16_t prescalar_mode, uint16_t prescalarValue, uint16_t alcc_mode)/! return Returns the state of the acknowledge bit after

51、 the I2C address write. 0=acknowledge, 1=no acknowledgeint8_t LTC2943_mode;int8_t ack = 0;LTC2943_mode = LTC2943_SLEEP_MODE|prescalar_mode|alcc_mode ;/! Set the control mode of the LTC2943 to sleep mode as well as set prescalar and AL#/CC# pin values.Serial.println();ack |= LTC2943_write(LTC2943_I2C

52、_ADDRESS, LTC2943_CONTROL_REG, LTC2943_mode);/! Writes the set mode to the LTC2943control registerdoSerial.print(F("*nn");delay(100);uint8_t status_code;uint16_t charge_code;ack |= LTC2943_read_16_bits(LTC2943_I2C_ADDRESS, LTC2943_ACCUM_CHARGE_MSB_REG, &charge_code); /! Read MSB and LS

53、B Accumulated Charge Registers for 16 bit charge codeack |= LTC2943_read(LTC2943_I2C_ADDRESS, LTC2943_STATUS_REG, &status_code);/! Read Status Registers for 8bit status codefloat charge;if(mAh_or_Coulombs)charge = LTC2943_code_to_coulombs(charge_code, resistor, prescalarValue);/! Convert charge

54、code toCoulombs if Coulomb units are desired.Serial.print("Coulombs: ");Serial.print(charge, 4);Serial.print(F(" Cn");elsecharge = LTC2943_code_to_mAh(charge_code, resistor, prescalarValue);/! Convert charge codeto mAh if mAh units are desired.Serial.print("mAh: ");Seri

55、al.print(charge, 4);Serial.print(F(" mAhn");Serial.print(F("Current ");Serial.print(F(" ADC Sleep.n");Serial.print(F("Voltage ");Serial.print(F(" ADC Sleep.n");Serial.print(F("Temperature ");Serial.print(F(" ADC Sleep.n");Serial.p

56、rint(F("m-Main Menunn"); checkAlerts(status_code);Serial.flush(); delay(AUTOMATIC_MODE_DISPLAY_DELAY);while (Serial.available() = false | (ack);read_int(); / clears the Serial.available return(ack);/! Shutdown Modeint8_t menu_5_shutdown_mode()/! return Returns the state of the acknowledge

57、bit after the I2C address write. 0=acknowledge, 1=no acknowledgeint8_t ack = 0;ack |= LTC2943_write(LTC2943_I2C_ADDRESS, LTC2943_CONTROL_REG, LTC2943_SHUTDOWN_MODE); /! Sets the LTC2943 into shutdown modeSerial.print("LTC2943 Has Been ShutDownn"); return(ack);/! Settings Menu int8_t menu_6

58、_settings(uint8_t *mAh_or_Coulombs, uint8_t*celcius_or_kelvin, uint16_t *prescalar_mode, uint16_t *prescalarValue, uint16_t *alcc_mode)/! return Returns the state of the acknowledge bit after the I2C address write. 0=acknowledge, 1=no acknowledgeint8_t ack = 0;int8_t user_command;doSerial.print(F("*