PAC1941T-1ESLASH4MX. datasheet(55/96 Pages) MICROCHIP

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 2021 Microchip Technology Inc.

DS20006543A-page 55

PAC194X

CTRL_ACT (21H) REGISTER

R-0

R-1

SAMPLE_MODE[3:0]

GPIO_ALERT2[1:0]

SLOW_ALERT1[1:0]

bit 15

bit 8

R-0

U-0

CHANNEL_N_OFF[3:0]

—

bit 7

bit 0

Legend:

R = Readable 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

This register contains an image of Register 7-2 and reflects the current active value of these settings, whereas the

values in register 01h may be programmed but not activated by one of the REFRESH commands. This register

allows software to determine the actual active settings. This register is valid when the results registers are valid, 1 ms

after a REFRESH/_V/_G command, in most cases. However, if you program a conversion rate change followed by

REFRESH, the new conversion rate will not become effective until the current conversion cycle is complete. This can

cause a delay in some cases before the conversion cycle (and the CTRL_ACT register) is updated. This delay can be

variable, depending on where you are in the conversion cycle when the REFRESH command is sent.

bit 15-12

SAMPLE_MODE[3:0]: These bits select one of the sampling modes listed below. These modes are

exclusive – that is, only one mode can be set at any given time. One of the sampling modes is Sleep,

when no sampling occurs.

0b0000 = 1024 SPS adaptive accumulation (default), see Section 5.13.1, "Adaptive Accumulator"

0b0001 = 256 SPS adaptive accumulation

0b0010 = 64 SPS adaptive accumulation

0b0011 = 8 SPS adaptive accumulation

0b0100 = 1024 SPS, see Section 5.15, "Conversion Cycle Controls"

0b0101 = 256 SPS

0b0110 = 64 SPS

0b0111 = 8 SPS

0b1000 = Single-Shot mode, see Section 5.15.4, "Single-Shot Mode"

0b1001 = Single-Shot 8X

0b1010 = Fast mode, see Section 5.15.3, "Fast Mode"

0b1011 = Burst mode, see Section 5.15.2, "Burst Mode"

0b1100 = Reserved

0b1101 = Reserved

0b1110 = Reserved

0b1111 = Sleep, see Section 5.5, "Sleep State"

bit 11-10

GPIO_ALERT2[1:0]: Select the signals for the GPIO/ALERT2 pin. If the pin is configured as a GPIO

pin, the R/W data for the pin are stored in Register 7-10.

00 = ALERT functions as an ALERT pin

01 = GPIO digital input. Read the digital value input to this pin from Register 7-10. Default for this pin.

10 = GPIO digital output. Write the digital value to be output from this pin to Register 7-10.

11 = The pin functions as the SLOW pin, taking the pin high overrides the programmed sample rate

and yields a sampling rate of 8 SPS.

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