PAC1721 datasheet(40/92 Pages) MICROCHIP

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PAC1721

DS-20007088A-page 40

 2026 Microchip Technology Inc. and its subsidiaries

bit 9:8

SLOW_ALERT0[1:0]: Selects the signals for the A0 pin, SLOW/ALERT function.

If pin A0 is configured as GPIO pin, the R/W data for the pin is stored in register SMBUS_SETTINGS.

While the A0 pin is multifunction, Microchip recommends using A0 as SLOW/ALERT pin.

00b = ALERT. Functions as ALERT0 pin.

01b = GPIO digital input. Read data from register SMBUS_SETTINGS as input to this pin. (default)

10b = GPIO digital output. Write data from this pin as output to register SMBUS_SETTINGS.

11b = SLOW. Functions as SLOW pin. Pulling the pin high overrides the programmed sample rate and

results in a sampling rate of 8 sps (Slow mode). Configuring the pin as SLOW pin takes priority

over other settings, including GPIO Triggered mode.

bit 7:5

AVERAGE[2:0]: Selects how many samples are included in rolling average.

000b = 4

001b = 8 (default)

010b = 16

011b = 32

100b = Reserved. Do not select this option.

101b = 64

110b = Reserved. Do not select this option.

111b = 128

bit 4

AA: Configures Adaptive Accumulation, which emulates a sample mode of 8,192 sps for all samples

rates when using the Slow function. The Adaptive Accumulation function works in conjunction with the

SAMPLE_MODE[3:0] bits.

For more details, see Section 4.8.1 and Section 4.8.2.

0b = Disables adaptive accumulation. The results in the accumulation register do not change when the

SLOW pin is pulled high (default).

1b = Enables adaptive accumulation. The results in the accumulation register change when the SLOW

pin is pulled high to match results obtained at 8,192 sps.

bit 3:2

ACC_CONFIG[1:0]: Configures accumulator to sum VPOWER calculations or VSENSE or VBUS samples.

00b = Accumulator sums VPOWER calculations (default)

01b = Accumulator sums VSENSE measurements

10b = Accumulator sums VBUS measurements

11b = Reserved. Do not select this option.

bit 1:0

AUTO_REFRESH[1:0]: Configures Auto-refresh. A Refresh (any) command occurs after a conversion

cycle completes. In Single-shot Average sample mode, a Refresh (any) command occurs only after the

configured number of samples are averaged (8 samples by default). This is controlled by the

AVERAGE[2:0] bits in this register.

While Auto-refresh is enabled, manual Refresh (any) commands are ignored. Disabling the feature

allows PAC1721 to execute manual Refresh (any) commands.

When Auto-refresh is enabled, functional changes are not applied. Before modifying register values,

ensure Auto-refresh is disabled. Auto-refresh can be re-enabled afterwards.

00b = Disables Auto-refresh. Requires manual Refresh (any) commands (default).

01b = Enables Auto-refresh. Resets accumulator and accumulator count.

PAC1721 executes a Limited Refresh to move VBUS, VSENSE, VPOWER, accumulator data and

accumulator count to the I2C domain.

10b = Enables Auto-refresh. Does not reset accumulator and accumulator count.

PAC1721 executes a Limited Refresh_V to move VBUS, VSENSE, VPOWER, accumulator data and

accumulator count to the I2C domain.

11b = Reserved. Do not select this option.

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