[参考译文] BQ25703A：所有 ADC 读数均为零

https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1518431/bq25703a-all-adc-readouts-are-reading-zero

工具/软件：

大家好、能否帮助我使用这款 BQ25703A 充电器芯片？

我正在尝试让它正常工作、但无法读取任何电压或电流值。  

这是我的 Arduino 源代码、我正在使用此库读取/写入寄存器： https://github.com/Lawmate/BQ25703A/tree/master

#include <Arduino.h>
#include <Wire.h>



#include "i2c_scanner.h"    
#include "usb_pd.h"
#include "io_expander.h"

// Define I2C pins 
const int I2C_SDA_PIN = 1; 
const int I2C_SCL_PIN = 0;


#include <Lorro_BQ25703A.h>
#define BQ25703ADevaddr    0x6B

//Initialise the device and library
Lorro_BQ25703A BQ25703A;
const byte Lorro_BQ25703A::BQ25703Aaddr = BQ25703ADevaddr;

//Instantiate with reference to global set
extern Lorro_BQ25703A::Regt BQ25703Areg;

void setup() {
  Serial.begin(115200);
  while (!Serial); // Wait for serial port to connect (optional)
  Serial.println(F("\nSystem Booting Up..."));

  // Initialize I2C bus - This is critical and should be done once.
  // The BQ25703A init function will use these pins if specified,
  // or assume Wire is already configured if pins are passed as -1 (default in charger.h)
  // For clarity, bq25703a_init can take these pins.
  Wire.begin(I2C_SDA_PIN, I2C_SCL_PIN); 
  Serial.print(F("I2C Initialized with SDA: ")); Serial.print(I2C_SDA_PIN);
  Serial.print(F(", SCL: ")); Serial.println(I2C_SCL_PIN);
  
  Serial.println(F("Scanning I2C bus..."));
  scan(); // Call your I2C scanner function
  delay(100);


  setup_usb();
  //setup_io_expander();

  //Set the watchdog timer to not have a timeout
  BQ25703Areg.chargeOption0.set_WDTMR_ADJ( 0 );
  BQ25703A.writeRegEx( BQ25703Areg.chargeOption0 );
  delay( 15 );

  //Set the ADC on IBAT and PSYS to record values
  //When changing bitfield values, call the writeRegEx function
  //This is so you can change all the bits you want before sending out the byte.
  BQ25703Areg.chargeOption1.set_EN_IBAT( 1 );
  BQ25703Areg.chargeOption1.set_EN_PSYS( 1 );
  BQ25703A.writeRegEx( BQ25703Areg.chargeOption1 );
  delay( 15 );

  //Set ADC to make continuous readings. (uses more power)
  BQ25703Areg.aDCOption.set_ADC_CONV( 0 );
  BQ25703Areg.aDCOption.set_ADC_START( 1 );
  //Set individual ADC registers to read. All have default off.
  BQ25703Areg.aDCOption.set_EN_ADC_VBUS( 1 );
  BQ25703Areg.aDCOption.set_EN_ADC_PSYS( 1 );
  BQ25703Areg.aDCOption.set_EN_ADC_IDCHG( 1 );
  BQ25703Areg.aDCOption.set_EN_ADC_ICHG( 1 );
  BQ25703Areg.aDCOption.set_EN_ADC_VSYS( 1 );
  BQ25703Areg.aDCOption.set_EN_ADC_VBAT( 1 );
  //Once bits have been twiddled, send bytes to device
  BQ25703A.writeRegEx( BQ25703Areg.aDCOption );
  delay( 15 );

  
}

unsigned long lastChargerStatusTime = 0;


void loop() {


  //handle_io_expander();
  BQ25703Areg.aDCOption.set_ADC_START( 1 );
  BQ25703A.writeRegEx( BQ25703Areg.aDCOption );
  delay( 15 );

   Serial.print( "Voltage of VBUS: " );
    Serial.print( BQ25703Areg.aDCVBUSPSYS.get_VBUS() );
    Serial.println( "mV" );
    delay( 15 );

    Serial.print( "System power usage: " );
    Serial.print( BQ25703Areg.aDCVBUSPSYS.get_sysPower() );
    Serial.println( "W" );
    delay( 15 );

    Serial.print( "Voltage of VBAT: " );
    Serial.print( BQ25703Areg.aDCVSYSVBAT.get_VBAT() );
    Serial.println( "mV" );
    delay( 15 );

    Serial.print( "Voltage of VSYS: " );
    Serial.print( BQ25703Areg.aDCVSYSVBAT.get_VSYS() );
    Serial.println( "mV" );
    delay( 15 );

    Serial.print( "Charging current: " );
    Serial.print( BQ25703Areg.aDCIBAT.get_ICHG() );
    Serial.println( "mA" );
    delay( 15 );

    Serial.print( "Voltage of VSYS: " );
    Serial.print( BQ25703Areg.aDCIBAT.get_IDCHG() );
    Serial.println( "mA" );
    delay( 15 );

  Serial.println("----------------");
  Serial.println();
  Serial.println();

    delay(10); // Small delay between reads to ensure bus stability, adjust if needed


     
  delay(5000);
}

此代码基本上是库中的 readVoltages 示例

以下是串行控制台的输出：

System Booting Up...
I2C Initialized with SDA: 1, SCL: 0
Scanning I2C bus...
Scanning...
I2C device found at address 0x27  !  -> PCF IO Expander
I2C device found at address 0x28  !  -> USB_PD
I2C device found at address 0x40  !  -> INA3221 ADC
I2C device found at address 0x6B  !  -> Charger
I2C device found at address 0x75  !  -> Buck converter
done


Initializing STUSB4500...
Connected to STUSB4500!
STUSB4500: Set to request 9V if possible

Voltage of VBUS: 3200mV
System power usage: 0.00W
Voltage of VBAT: 2880mV
Voltage of VSYS: 2880mV
Charging current: 0mA
Voltage of VSYS: 0mA
----------------