Category: Hardware
Product Number: LTC2497
hi team
We are using the LTC2497 in single-ended mode, with IN- grounded and a reference voltage (Vref) of 2.5V. Channel 11 is connected to an input voltage of 0.85V. The I2C data read from the LTC2497 is 0xAD47C0, which translates to output_reg[21:6] = 0x00B51F = 46367.
Based on the calculation:
1 * (46367 / 65535) * 0.500 * 2.500 = 0.884V
However, the input voltage remains constant at 0.85V. While other channels are being used to calculate current from other devices, we are using this channel specifically to cross-check the calculations. Despite this, we observe a discrepancy in the calculated result.
Could you confirm if there is an issue with the data decoding or calculations?
The Channel 11 is hard wired on the board to a 0.85V supply. i will cross check the voltage with scope again. The red box is the reference voltage and purple is the channel 11, we cannot check the other channel as they are used as current monitor from other IC.