JAJSDU6A August 2017 – February 2019 TPS65919-Q1
PRODUCTION DATA.
The GPADC channels are calibrated in the production line using a 2-point calibration method. The channels are measured with two known values (X1 and X2) and the difference (D1 and D2) to the ideal values (Y1 and Y2) are stored in the OTP memory. Figure 5-16 shows the principle of the calibration.
Some of the GPADC channels can use the same calibration data. Use Equation 4 and Equation 5 to calculate the corrected result.
If the measured code is a, the corrected code a' is calculated using Equation 6.
Table 5-10 lists the parameters, X1 and X2, and the register for D1 and D2 required in the calculation for all the channels.
CHANNEL | X1 | X2 | D1 | D2 | COMMENTS |
---|---|---|---|---|---|
0, 1 | 2064 (0.63 V) | 3112 (0.95 V) | GPADC_TRIM1 | GPADC_TRIM2 | |
3 | 2064 (2.52 V) | 3112 (3.8 V) | GPADC_TRIM3 | GPADC_TRIM4 | When HIGH_VCC_SENSE = 0 |
3 | 2064 (2.52 V) | 3112 (3.8 V) | GPADC_TRIM5 | GPADC_TRIM6 | When HIGH_VCC_SENSE = 1 |