ADF4377 Temperature Sensor REG004C

Hi,

Does there exist a method to convert the value from a temperature sensor's register into an actual temperature reading? Thank you!

In our system, ADC results are expressed in LSB/℃. You can directly access the temperature value from the CHIP_TEMP bitfield, where CHIP_TEMP[8] indicates the sign (0 = positive, 1 = negative), and CHIP_TEMP[7:0] represents the magnitude.

The temperature accuracy is around ±10℃.

Here’s an example based on an evaluation board demonstrating two modes of temperature measurement:

1. Ambient Temperature Mode:
   After powering the chip, it begins in a powered-down state. Follow the register update procedure in Table 23 of the datasheet to measure ambient temperature.

   • At 20℃ ambient temperature, the ADC typically reads ~22℃, with CHIP_TEMP = 0x016.
   • At 30℃ ambient temperature, the ADC reads ~32℃, with CHIP_TEMP = 0x020.

2. Normal Operation Mode:
   Once in normal operation:

   • At 20℃ ambient, the ADC should read ~58℃, with CHIP_TEMP = 0x03A.
   • At 30℃ ambient, the ADC should read ~70℃, with CHIP_TEMP = 0x046.

In our system, ADC results are expressed in LSB/℃. You can directly access the temperature value from the CHIP_TEMP bitfield, where CHIP_TEMP[8] indicates the sign (0 = positive, 1 = negative), and CHIP_TEMP[7:0] represents the magnitude.

The temperature accuracy is around ±10℃.

Here’s an example based on an evaluation board demonstrating two modes of temperature measurement:

1. Ambient Temperature Mode:
   After powering the chip, it begins in a powered-down state. Follow the register update procedure in Table 23 of the datasheet to measure ambient temperature.

   • At 20℃ ambient temperature, the ADC typically reads ~22℃, with CHIP_TEMP = 0x016.
   • At 30℃ ambient temperature, the ADC reads ~32℃, with CHIP_TEMP = 0x020.

2. Normal Operation Mode:
   Once in normal operation:

   • At 20℃ ambient, the ADC should read ~58℃, with CHIP_TEMP = 0x03A.
   • At 30℃ ambient, the ADC should read ~70℃, with CHIP_TEMP = 0x046.