PAC1721 datasheet(39/92 Pages) MICROCHIP

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DS-20007088A-page 39

PAC1721

CONTROL (ADDRESS 01H)

R/W-0

R/W-1

R/W-0

R/W-1

R/W-0

R/W-1

SAMPLE_MODE[3:0]

GPIO_ALERT1[1:0]

SLOW_ALERT0[1:0]

bit 15

bit 8

R/W-0

R/W-1

R/W-0

AVERAGE[2:0]

ACC_CONFIG[1:0]

AUTO_REFRESH [1:0]

bit 7

bit 0

Legend:

R = Read bit

W = Writable bit

U = Unimplemented bit, read as 0

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

X = Bit is unknown

bit 15:12

SAMPLE_MODE[3:0]: Selects one of the sample modes listed below. These modes are exclusive –

only one mode can be set at any given time.

One of the sample rate options is Sleep state for when no sampling occurs.

When switching sample modes during a conversion cycle, the ADC continues the current sample mode

until the conversion completes and then switches to the new sample mode. Registers CONTROL and

CONTROL_ACT update.

Switching from a Continuous sample mode to a Single-shot mode triggers an extra conversion cycle.

When using a GPIO Triggered sample mode, first configure the desired pin (A0 or A1) as an input by

setting the SLOW_ALERT0[1:0] or GPIO_ALERT1[1:0] bits to 01b.

0000b = 8,192 sps (see Section 4.8.1)

0001b = 4,096 sps

0010b = 1,024 sps (default)

0011b = 256 sps

0100b = 64 sps

0101b = 8 sps (Slow mode) (see Section 4.2.8)

0110b = Single-shot mode (see Section 4.9.1)

0111b = Single-shot Average mode

1000b = Single-shot Awake mode

1001b = Single-shot Awake Average mode

1010b = VBUS Only at 16,384 sps (see Section 4.2.9)

1011b = VSENSE Only at 16,384 sps (see Section 4.2.9)

1100b = GPIO (A0) Triggered Single-shot Awake mode, Edge (see Section 4.9.1.4)

1101b = GPIO (A1) Triggered Single-shot Awake mode, Edge (see Section 4.9.1.4)

1110b = Sleep state (see Section 4.2.6)

1111b = Sleep state (see Section 4.2.6)

bit 11:10

GPIO_ALERT1[1:0]: Selects the signals for the A1 pin, GPIO1/ALERT function.

If pin A1 is configured as GPIO pin, the R/W data for the pin is stored in register SMBUS_SETTINGS.

While the A1 pin is multifunction, Microchip recommends using A1 as GPIO/ALERT pin.

00b = ALERT. Functions as ALERT1 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 sample rate of 8 sps (Slow mode). Configuring the pin as SLOW pin takes priority

over other settings, including GPIO Triggered mode.

PAC1721 Datasheet(PDF) 39 Page - Microchip Technology

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