#CC2640r2f 锂电池供电电量检测

yekun kun

Other Parts Discussed in Thread: CC2640R2F

你好，我使用锂电池经过稳压供电，想用cc2640r2f 的adc测电量，目前锂电池的电压3.89v ，使用两个1m的电阻分压，但是，分压完完毕后，万用表测量为1.89v，cc2640r2f Io28测到电压1.7v左右；我应该怎么提高精度？

3 年多前

0 Kevin Qiu1 3 年多前

TI__Guru* 82220 points

正常来说不会差这么多，用示波器再测下看看，你的参考电压设置的是多少，提高精度可以多次采样取平均值

0 yekun kun 3 年多前回复 Kevin Qiu1

Expert 1260 points

你好这是代码：

/* Analog Capable DIOs */
#define CC2640R2_LAUNCHXL_DIO23_ANALOG PIN_UNASSIGNED//IOID_23
#define CC2640R2_LAUNCHXL_DIO24_ANALOG PIN_UNASSIGNED//IOID_24
#define CC2640R2_LAUNCHXL_DIO25_ANALOG PIN_UNASSIGNED//IOID_25
#define CC2640R2_LAUNCHXL_DIO26_ANALOG PIN_UNASSIGNED//IOID_26
#define CC2640R2_LAUNCHXL_DIO27_ANALOG PIN_UNASSIGNED//IOID_27
#define CC2640R2_LAUNCHXL_DIO28_ANALOG IOID_28
#define CC2640R2_LAUNCHXL_DIO29_ANALOG PIN_UNASSIGNED//IOID_29
#define CC2640R2_LAUNCHXL_DIO30_ANALOG PIN_UNASSIGNED//IOID_30

{
.adcDIO = CC2640R2_LAUNCHXL_DIO28_ANALOG,
.adcCompBInput = ADC_COMPB_IN_AUXIO2,
.refSource = ADCCC26XX_FIXED_REFERENCE,
.samplingDuration = ADCCC26XX_SAMPLING_DURATION_2P7_US,
.inputScalingEnabled = true,
.triggerSource = ADCCC26XX_TRIGGER_MANUAL,
.returnAdjustedVal = false
},

// Define name for ADC channel index
#define THERMOCOUPLE_OUT 5
uint32_t resultUv;
void adc_convert(void)
{
static uint16_t result;

// initialize optional ADC parameters
ADC_Params params;
ADC_Params_init(&params);
params.isProtected = true;

// Open ADC channels for usage
ADC_Handle adcHandle = ADC_open(THERMOCOUPLE_OUT, &params);

// Sample the analog output from the Thermocouple
ADC_convert(adcHandle, &result);

Battery_level=(int8_t)(((2*4.3/4096*result)-3.3)/1.2)*100;
ADC_close(adcHandle);
}

你好示波器怎么量，直接量电压吗