ADS8699: ADS8699

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Alice：

您好， 已经收到了您的案例，调查需要些时间，感谢您的耐心等待。

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? ?：

Thank you for your reply. I'm currently unsure how to parse the response data when sending configuration commands. However, I can see that the register status is already configured in the second frame when I use the READ-HWORD command. I'd like to confirm that, when reading data periodically in automatic mode, the host can obtain data by sending 0x00. Here is the function, and I appreciate your help:
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uint32_t Read_ADS8699(void) {uint32_t command = 0xC8000000;// Command to read the data register (address 0x00)uint16_t tx_buffer[2] = {0x0000};// Transmission buffer initialized with 0x0000uint16_t rx_buffer[2];// Reception buffer// Pull CS pin low to start communicationHAL_GPIO_WritePin(SPI_CS_GPIO_Port, SPI_CS_Pin, GPIO_PIN_RESET);HAL_SPI_TransmitReceive(&hspi1, (uint8_t*)tx_buffer, (uint8_t*)rx_buffer, 2, HAL_MAX_DELAY);// Transmit the read command and receive the first 16-bit data// Combine the 18-bit datauint32_t data = ((uint32_t)(rx_buffer[0] & 0x00FF) << 16) | rx_buffer[1];// Shift the upper 8 bits left by 16 positions and combine with the lower 16 bits//data = data >> 6;// Uncomment this line if you need to right-shift the data by 6 bits (not necessary in this case)// Pull CS pin high to end communicationHAL_GPIO_WritePin(SPI_CS_GPIO_Port, SPI_CS_Pin, GPIO_PIN_SET);return data;
}

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? ?：

I have configured the ADS8699 to set the voltage range to ±5.12V through the following register settings:
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void SDI_REG_WRITE(void) // Set range
{uint8_t command = 0xD0;uint8_t addr = 0x08;uint8_t H = 0x00;uint8_t L = 0x00;HAL_GPIO_WritePin(SPI_CS_GPIO_Port, SPI_CS_Pin, GPIO_PIN_RESET);HAL_SPI_Transmit(&hspi1, &command, 1, HAL_MAX_DELAY);// Send write commandHAL_SPI_Transmit(&hspi1, &addr, 1, HAL_MAX_DELAY);// Send register addressHAL_SPI_Transmit(&hspi1, &H, 1, HAL_MAX_DELAY);// Send high byteHAL_SPI_Transmit(&hspi1, &L, 1, HAL_MAX_DELAY);// Send low byteHAL_GPIO_WritePin(SPI_CS_GPIO_Port, SPI_CS_Pin, GPIO_PIN_SET);}void RANG_REG_WRITE(void) // Set range
{uint8_t command = 0xD0;uint8_t addr = 0x14;uint8_t H = 0x00;uint8_t L = 0x03;HAL_GPIO_WritePin(SPI_CS_GPIO_Port, SPI_CS_Pin, GPIO_PIN_RESET);HAL_SPI_Transmit(&hspi1, &command, 1,_MAX HAL_DELAY);// Send write commandHAL_SPI_Transmit(&hspi1, &addr, 1, HAL_MAX_DELAY);// Send register addressHAL_SPI_Transmit(&hspi1, &H, 1, HAL_MAX_DELAY);// Send high byteHAL_SPI_Transmit(&hspi1, &L, 1, HAL_MAX_DELAY);// Send low byteHAL_GPIO_WritePin(SPI_CS_GPIO_Port, SPI_CS_Pin, GPIO_PIN_SET);}void RST_REG_WRITE(void) // Reset register
{uint8_t command = 0xD0;uint8_t addr = 0x04;uint8_t H = 0x69;uint8_t L = 0x00;HAL_GPIO_WritePin(SPI_CS_GPIO_Port, SPI_CS_Pin, GPIO_PIN_RESET);HAL_SPI_Transmit(&hspi1, &command, 1, HAL_MAX_DELAY);// Send write commandHAL_SPI_Transmit(&hspi1, &addr, 1, HAL_MAX_DELAY);// Send register addressHAL_SPI_Transmit(&hspi1, &H, 1, HAL_MAX_DELAY);// Send high byteHAL_SPI_Transmit(&hspi1, &L, 1, HAL_MAX_DELAY);// Send low byteHAL_GPIO_WritePin(SPI_CS_GPIO_Port, SPI_CS_Pin, GPIO_PIN_SET);}void RST1_REG_WRITE(void) // Reset register
{uint8_t command = 0xD0;uint8_t addr = 0x04;uint8_t H = 0x00;uint8_t L = 0x00;HAL_GPIO_WritePin(SPI_CS_GPIO_Port, SPI_CS_Pin, GPIO_PIN_RESET);HAL_SPI_Transmit(&hspi1, &command, 1, HAL_MAX_DELAY);// Send write commandHAL_SPI_Transmit(&hspi1, &addr, 1, HAL_MAX_DELAY);// Send register addressHAL_SPI_Transmit(&hspi1, &H, 1, HAL_MAX_DELAY);// Send high byteHAL_SPI_Transmit(&hspi1, &L, 1, HAL_MAX_DELAY);// Send low byteHAL_GPIO_WritePin(SPI_CS_GPIO_Port, SPI_CS_Pin, GPIO_PIN_SET);}void DATA_REG_WRITE(void) // Data output format register
{uint8_t command = 0xD0;uint8_t addr = 0x10;uint8_t H = 0x00;uint8_t L = 0x00;HAL_GPIO_WritePin(SPI_CS_GPIO_Port, SPI_CS_Pin, GPIO_PIN_RESET);HAL_SPI_Transmit(&hspi1, &command, 1, HAL_MAX_DELAY);// Send write commandHAL_SPI_Transmit(&hspi1, &addr, 1, HAL_MAX_DELAY);// Send register addressHAL_SPI_Transmit(&hspi1, &H, 1, HAL_MAX_DELAY);// Send high byteHAL_SPI_Transmit(&hspi1, &L, 1, HAL_MAX_DELAY);// Send low byteHAL_GPIO_WritePin(SPI_CS_GPIO_Port, SPI_CS_Pin, GPIO_PIN_SET);}

However, when I read the converted value from the ADS8699 using the following function, the result is always around 6.2V, while the actual input voltage is -4.8V:
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uint32_t Read_ADS8699(void) {uint32_t command = 0xC8000000;// Command to read data register (address 0x00)uint8_t tx_buffer[4];uint8_t rx_buffer[4];tx_buffer[0] = 0x00;tx_buffer[1] = 0x00;tx_buffer[2] = 0x00;tx_buffer[3] = 0x00;// CS low, start communicationHAL_GPIO_WritePin(SPI_CS_GPIO_Port, SPI_CS_Pin, GPIO_PIN_RESET);HAL_SPI_TransmitReceive(&hspi1, (uint8_t*)tx_buffer, (uint8_t*)rx_buffer, 4, HAL_MAX_DELAY);// Transmit and receive datauint32_t data = rx_buffer[0] << 24;data |= rx_buffer[1] << 16;data |= rx_buffer[2] << 8;data |= rx_buffer[3];data = (data & 0xfffc0000) >> 14;// Extract the 18-bit data// CS high, end communicationHAL_GPIO_WritePin(SPI_CS_GPIO_Port, SPI_CS_Pin, GPIO_PIN_SET);return data;
}

I'm not sure why the reading is incorrect. Can you help me identify the issue?

,

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Who is the customer and what is the application/end equipment?  Can you please provide screen shots fro an o'scop or logic analyzer?

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,

? ?：

Using the STM32L431 chip, the ADS8699 is configured with a voltage range of ±5.12V. The following two screenshots from the logic analyzer show +5V and -5V inputs, respectively. However, the converted results seem to be incorrect.

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Can you please supply the o'scope or logic analyzer plot that was asked for?