Datasheet

bq76PL536A-Q1

SLUSAM3 –MAY 2011

www.ti.com

FUNCTION_CONFIG REGISTER (0x40)

7 6 5 4 3 2 1 0

0 0 GPAI_REF GPAI_SRC CN[1] CN[0] – 0

The FUNCTION_CONFIG sets the default configuration for special features of the device.

[5] (GPAI_REF): This bit sets the reference for the GPAI ADC measurement.

0 = Internal ADC bandgap reference

1 = V

REG50

(ratiometric)

[4] (GPAI_SRC): This bit controls multiplexing of the GPAI register and determines whether the ADC mux

is connected to the external GPAI inputs, or internally to the BAT1 pin. The register

results are automatically scaled to match the input.

0 = External GPAI inputs are converted to result in GPAI register 0x01–02.

1 = BAT pin to VSS voltage is measured and reported in the GPAI register.

[3..2] (CN[1..0]): These two bits configure the number of series cells used. If fewer than 6 cells are

configured, the corresponding OV/UV faults are ignored. For example, if the CN[x] bits

are set to 10b (2), then the OV/UV comparators are ignored for cells 5 and 6.

CN[1] CN[0] SERIES CELLS

0 0 6 (DEFAULT)

0 1 5

1 0 4

1 1 3

IO_CONFIG REGISTER (0x41)

7 6 5 4 3 2 1 0

CRCNOFLT – – – – – – CRC_DIS

The IO_CONFIG sets the default configuration for miscellaneous I/O features of the device.

[7] (CRCNOFLT): This bit enables and disables detected CRC errors asserting the FAULT pin.

0 = CRC errors cause the FAULT[CRC] bit to be set and the FAULT pin to assert. The

FAULT[CRC] bit must be reset as described in the text.

1 = CRC errors cause the FAULT[CRC] bit to be set and the FAULT pin is not

asserted. The FAULT[CRC] bit must be reset as described in the text.

[0] (CRC_DIS): This bit enables and disables the automatic generation of the CRC for the SPI

communication packet. The packet size is determined by the host as part of the read

request protocol. The CRC is checked at the deassertion of the CS pin. TI recommends

that this bit be changed using the broadcast address (0x3f) so that all devices in a battery

stack use the same protocol.

0 = A CRC is expected, and generated as the last byte of the packet.

1 = A CRC is not used in communications.

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