BQ76PL455APFCT datasheet(70/125 Pages) TI1

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bq76PL455A

SLUSCL0A – SEPTEMBER 2016 – REVISED OCTOBER 2016

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BIT

NAME

DESCRIPTION

[6]

CMD_HTSEL

Analog die temperature. Usually used as part of self-testing.

[5]

CMD_V18SEL

VDD18 internal digital supply. Usually used as part of self-testing.

[4]

RSVD

Reserved — Always write a 0.

[3]

RSVD

Reserved — Always write a 0.

[2]

CMD_REFSEL

4.5-V analog die reference (window comparator ref) is included when a COMMAND is executed. This bit

selects both the 4.5-V reference and the ground output from the reference MUX. Sampling and reporting

will be 4.5 V and then ground. This command is generally used for self-testing purposes.

[1]

CMD_MODULESEL

Sum-of-cells (VMODULE) monitor is included when a COMMAND is executed. Two conversions are

performed to get this value, but only the average of the two is stored and reported.

TSTCONFIG[MODULE_MON_EN] is used to enable the MODULE measurement. When

TSTCONFIG[MODULE_MON_EN] = 0, but CMD_MODULESEL = 1, then ground will be measured. This

selection is generally used for self-testing purposes.

[0]

CMD_VMMONSEL

VM (negative supply charge pump) voltage monitor. TST_CONFIG[VM_MON_EN] is used to enable the

measurement. This selection is generally used for self-testing purposes.

7.6.3.4 OVERSMPL 0x07 (7) Command Oversampling

BIT

NAME

DESCRIPTION

[7]

CMD_OVS_CYCLE

This bit only applies to voltage and AUX averaging (oversampling).

= 0

Average channels by sampling multiple times on the same channel

before changing channel. The initial sample period for the first sample

on each channel is made per the respective ADC_PERIOD_VOL and

ADC_PERIOD_AUXx time period settings, and then each subsequent

average occurs at the respective CMD_OVS_HPER and

CMD_OVS_GPER period settings.

= 1

Average channels by cycling through all channels one sample per

channel before resampling. All voltage averages are completed before

any AUX sampling begins and then all AUX are completed before

anything else. The settling time before voltage sampling is set by

ADC_PERIOD_VOL and the settling time before AUX sampling is set

by ADC_PERIOD_AUXx.

[6:5]

CMD_OVS_HPER

= 3

CMD_OVS_HPER sets the averaging period for the:

•

Internal temperature measurement of the analog die

•

4.5-V voltage reference of the analog die

•

VM monitor

•

Sum-of-cells (VMODULE) monitor

When CMD_OVS_CYCLE = 0, this value also sets the period for the averaging on all

the cell voltage channels.

These bits must be set to 3 (0b11), which selects 12.6 µs as the average period. Other

settings are Reserved and should not be used.

[4:3]

CMD_OVS_GPER

CMD_OVS_GPER sets the averaging period for:

•

Internal temperature measurement of the digital die. Note that

although CMD_OVS_GPER bits set the timing for the internal

temperature measurement of the digital die, averaging is not used

for this measurement.

•

VDD18

When CMD_OVS_CYCLE = 0, this value also sets the period for the averaging on all

the auxiliary channels.

= 0

= 1

= 2

= 3

4.13 µs

5.96 µs

8.02 µs

12.6 µs: This setting is recommended for best accuracy in most

designs. See the Application and Implementation section for detailed

information on using other settings.

BQ76PL455APFCT Datasheet(PDF) 70 Page - Texas Instruments

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