BQ76PL536APAPR datasheet(21/74 Pages) TI1

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DRDY_N

I-to-V Conversion

CONVERT_END

CONVERT_START

DRDY_S

DRDY_H

V-to-I Conversion

DEVICE_STATUS[DRDY]

SET

CLR

bq76PL536A

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SLUSAD3B – JUNE 2011 – REVISED JANUARY 2016

Feature Description (continued)

7.3.1.7.2

Data Ready

The bq76PL536A signals that data is ready when the last conversion data has been stored to the associated

data result register by asserting the DRDY_S pin (DRDY_H if HOST = 0) if the DRDY_N pin is also asserted

(Figure 15). DRDY_S (DRDY_H) signals are cleared on the next conversion start.

Figure 15. Data-Ready Logic

7.3.1.7.3

ADC Channel Selection

The ADC_CONTROL register can be configured as follows:

Table 1. ADC_CONTROL Register Configuration

MEASUREMENT

ADC_CONTROL

VCELL1

CELL_SEL = 0x00

VCELL1, VCELL2

CELL_SEL = 0x01

VCELL1, VCELL2, VCELL3

CELL_SEL = 0x02

VCELL1, VCELL2, VCELL3, VCELL4

CELL_SEL = 0x03

VCELL1, VCELL2, VCELL3, VCELL4, VCELL5

CELL_SEL = 0x04

VCELL1, VCELL2, VCELL3, VCELL4, VCELL5, VCELL6

CELL_SEL = 0x05

External thermistor input 1

TS1 = 1

External thermistor input 2

TS2 = 1

General-purpose analog input

GPAI = 1

7.3.1.7.4

Conversion Time Control

The ADC conversion time is fixed at approximately 6 µs per converted channel, plus 6 µs overhead at the start of

the conversion. Total conversion time (µs) is approximately 6 × num_channels + 6.

7.3.1.7.5

Automatic Versus Manual Control

The ADC_CONTROL[ADC_ON] bit controls powering up the ADC section and the main bandgap reference. If

the bit is set to 1, the internal circuits are powered on, and current consumption by the part increases.

Conversions begin immediately on command. The host CPU should wait >500 µs before initiating the first

conversion after setting this bit.

If the ADC_ON bit is false, an additional 500 µs is required to stabilize the reference before conversions begin.

If the sampling interval (time between conversions) used is less than approximately 10 ms, manual mode should

be selected to avoid shifting the voltage reference, leading to inaccuracy in the measurements.

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