BQ7693003DBT datasheet(47/63 Pages) TI1

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bq76920, bq76930, bq76940

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SLUSBK2F – OCTOBER 2013 – REVISED NOVEMBER 2015

•

Configure the Current-based protection settings through PROTECT1 and PROTECT2:

–

Ideal SCD Threshold = 25 A × 5 m

Ω = 125 mV.

•

However, the closest options are 111 mV (0x03) and 133 mV (0x04) providing 22.2 A and 26.6

A, respectively. Both options have the RSNS bit = 1.

•

0x03 (22.2 A) will be used in this example.

–

The SCD delay threshold setting for a 100 µs delay is 0x01.

–

Therefore, PROTECT1 should be programmed with 0x8C.

–

Ideal OCD Threshold = 15 A × 5 m

Ω = 75 mV.

•

However, the closest options are 72 mV (0x0A) and 78 mV (0x0B), providing 14.4 A and 15.6 A,

respectively. Both options have the RSNS bit = 1.

•

0x0A (14,4A) will be used in this example.

–

The OCD delay threshold setting for a 320-ms delay is 0x05.

–

Therefore, PROTECT2 should be programmed with 0x5B.

NOTE

Care should be taken when determining the setting of OV_TRIP and UV_TRIP as these are

ADC value outputs and correlation to cell voltage also requires consideration of the ADC

GAIN and ADC OFFSET registers. More specific details can be found in Section 7.3.1.2.

•

Configure the Voltage-based protection settings through OV_TRIP, UV_TRIP and PROTECT3:

–

The selected OV Threshold is 4.30 V.

•

Therefore, OV_TRIP should be programmed with 0xC9.

–

The selected UV Threshold is 2.5 V.

•

Therefore, UV_TRIP should be programmed with 0x1A.

–

The selected OV Delay is 2 s and the selected UV Delay is 4 s.

•

Therefore, PROTECT3 should be programmed with 0x50.

Application and Implementation

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