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ADS1220: I need help about data rate time for Turbo Mode. Time period is smaller than conversion time in Datasheet.

Fatih Cavdarci
Prodigy 10 points
Part Number: ADS1220

Tool/software:

Hi,

I need help about data rate time for Turbo Mode, Data Rate (011: 350 SPS), Continuous Mode. I will share the code below. (ADS1220_default_regs:0x01, 0x74, 0xC0, 0x00)

I connected potentiometer to the input of adc and I can configure and read the ADC normally.

Data conversion period normally required about 2.9 millisecond for 350SPS but I measure the time between start of conversion to end is 2ms.

Also I measured accurate the time for 1000 conversion is 2000ms. (One coversion time is 2ms again.) Is it normal?

ADS1220_regs regs = ADS1220_default_regs;

ini = ADS1220_init(&hspi1, &regs);

HAL_Delay(100); // Best to let settle

ADS1220_set_pga_gain(&hspi1, ADS1220_PGA_GAIN_1, &regs);

ADS1220_disable_PGA(&hspi1, &regs);

ADS1220_set_conv_mode_single_shot(&hspi1, &regs);

ch1 = ADS1220_read_singleshot_channel(&hspi1, ADS1220_MUX_AIN0_AIN1, &regs, DRDY_ADC2_GPIO_Port, DRDY_ADC2_Pin, 100);

uint16_t tmr_init = 0;

uint16_t tmr_finish = 0;

tmr_init = HAL_GetTick();

ch1 = ADS1220_read_singleshot_channel(&hspi1, ADS1220_MUX_AIN0_AIN1, &regs, DRDY_ADC2_GPIO_Port, DRDY_ADC2_Pin, 100);

tmr_finish = HAL_GetTick();

tmr_finish = tmr_finish - tmr_init;