BQ76PL455APFCT datasheet(103/125 Pages) TI1

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VIN1

* VOUT1

OEC

VIN1

* VOUT1 *

- ç ÷

GEC

1 *

1 *2

103

bq76PL455A

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SLUSCL0A – SEPTEMBER 2016 – REVISED OCTOBER 2016

Product Folder Links: bq76PL455A

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Application Information (continued)

(14)

NOTE

The final GEC should be an 8-bit 2's-complement value in the range –128 to +127

after discarding the upper 8 bits of the 16-bit value. Values exceeding this are suspect

and probably indicate an error. If using such a value, saturate (–128 or +127) the

resulting 8-bit value and correct the sign as necessary.

This gain adjustment is input dependent—A correction of 9 mV at full-scale input,

results in a correction of 4.5 mV at half-scale input.

5. Write the 8-bit value to the VSGAIN register.

6. Perform the steps in Offset Error Correction.

8.1.3.2.2

Offset Error Correction

Offset Error Correction: –9.77 mV to 9.69 mV in 255 steps (8 bits) in register VSOFFSET

Procedure: (Use m, VIN1, and VOUT1 from the Gain Error Correction procedure.)

1. Find the offset error correction (OEC).

(15)

NOTE

The final OEC should be an 8-bit 2's-complement value in the range –128 to +127 after

discarding the upper 8-bits of the 16-bit value. Values exceeding this are suspect and

probably indicate an error. If such a value must be used, the resulting 8-bit value should

be saturated (–128 or +127) and sign corrected as necessary.

2. Write the 8-bit value to the VSOFFSET register.

3. Save the new values to EEPROM by setting DEV_CTRL[WRITE_EEPROM], after setting the appropriate

values for MAGIC1 and MAGIC2. The EEPROM checksum will also require re-calculation and saving due to

this (or any) change.

8.1.3.3 AUX Channel Post-Assembly Calibration Adjustment

Using post-assembly calibration adjustment can also improve the AUX channel accuracy further after exposure

to soldering and/or bake cycles in the manufacturing process. The process is similar to the steps for the

VSENSE channel correction, with three differences:

•

AUX channels only have offset correction, there is no gain correction.

•

Each AUX channel has an individual offset correction register, rather than a single global correction.

•

The correction range has an extension from –39.06 mV to 38.99 mV in 1023 steps (10 bits).

Perform the correction procedures at room temperature (RT) using a stable, high-accuracy DC source and / or

voltmeter. The registers contain 10-bit, signed, 2's-complement values. A zero value in any register indicates no

correction. Each correction measures two voltage points. The procedure can use the expected minimum and

maximum values for the cell. However, the lowest VINMIN value should be greater than or equal to 2.0 V and the

highest VINMAX should be less than or equal to 4.5 V.

BQ76PL455APFCT Datasheet(PDF) 103 Page - Texas Instruments

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