JAJSP58 September 2022 TPS544C26
ADVANCE INFORMATION
| CMD Address | A4h |
| Write Transaction: | Write Byte |
| Read Transaction: | Read Byte |
| Format: | Unsigned Binary (1 byte) |
| NVM Back-up: | EEPROM |
| Updates: | On-the-fly |
The IMON_CAL command contains 2 fields (Gain and Offset) for READ_IOUT (IMON) calibration.
Return to Supported I2C and Default Values.
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| R/W | R/W | R/W | R/W | R/W | R/W | R/W | R/W |
| IMON_GAIN_CAL | IMON_OFS_CAL | ||||||
| LEGEND: R/W = Read/Write; R = Read only |
| Bit | Field | Access | Reset | Description |
|---|---|---|---|---|
| 7:4 | IMON_GAIN_CAL | R/W | NVM | These bits contains the
READ_IOUT (IMON) gain calibration. This field gives flexibility to
change the gain of nominal reporting by −3.5% to +4%. 0000b: IMON Gain Adjustment = −3.5% 0001b: IMON Gain Adjustment = −3.0% 0010b: IMON Gain Adjustment = −2.5% 0011b: IMON Gain Adjustment = −2.0% 0100b: IMON Gain Adjustment = −1.5% 0101b: IMON Gain Adjustment = −1.0% 0110b: IMON Gain Adjustment = −0.5% 0111b: IMON Gain Adjustment = −0% 1000b: IMON Gain Adjustment = +0.5% 1001b: IMON Gain Adjustment = +1.0% 1010b: IMON Gain Adjustment = +1.5% 1011b: IMON Gain Adjustment = +2.0% 1100b: IMON Gain Adjustment = +2.5% 1101b: IMON Gain Adjustment = +3.0% 1110b: IMON Gain Adjustment = +3.5% 1111b: IMON Gain Adjustment = +4.0% |
| 3:0 | IMON_OFS_CAL | R/W | NVM | These bits contains the
READ_IOUT (IMON) offset calibration. This field gives flexibility to
change the nominal reporting by −2.0 A to 1.75 A. However, special
attention is needed when setting the offset adjustment to a negative
value. The calculation from the combination of ADC conversion and
calibration register input is not clamped at zero. When the
calculated value of (ADC conversion result + calibration offset
value) goes negative, the final reporting value rolls over to a
large positive value (decreased from the maximum limit). For
example, for a case of real IOUT = 0.5 A, IMON offset
adjutment = −1.0 A, ICC_MAX = 30 A, the final reporting value is not
clamped at 0 A, instread, the reporting value shows +29.5 A. TI
suggests using the calibration offset in a way that the calculated
value from (ADC conversion result + calibration offset value) never
goes negative, especially at minimum load case. 0000b - 0111b: Negative offset adjustment but NOT recommended to use if the minimum load (IOUT) is 0 A. Contact TI for details in case of negative offset adjustment needed. 1000b: IMON Offset Adjustment = 0 A 1001b: IMON Offset Adjustment = +0.25 A 1010b: IMON Offset Adjustment = +0.50 A 1011b: IMON Offset Adjustment = +0.75 A 1100b: IMON Offset Adjustment = +1.00 A 1101b: IMON Offset Adjustment = +1.25 A 1110b: IMON Offset Adjustment = +1.50 A 1111b: IMON Offset Adjustment = +1.75 A |