PAC1933T-ISLASHJQ. datasheet(46/62 Pages) MICROCHIP

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PAC1932/3/4

DS20005850C-page 46

 2017-2018 Microchip Technology Inc.

CTRL_ACT REGISTER (ADDRESS 21H)

R-0R-0

Sample_Rate<1:0>

SLEEP

SING

ALERT_PIN

ALERT_CC

OVF ALERT

OVF

bit 7

bit 0

Legend:

R = Readable bit

W = Writeable 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 the Control register, 01h. The bits in this register reflect the current active value of

these settings, whereas the values in register 01h may have been programmed but not activated by one of the

REFRESH commands. This register allows the software to determine the actual active setting.

This register is valid when the Results registers are valid, 1 ms after a REFRESH/_V/_G command (in most cases).

However, if the users program a conversion rate change followed by REFRESH, the new conversion rate will not

become effective until the current conversion cycle is complete. For example, if the old sample rate was 8 Hz, it will

take up to 125 mS before the conversion cycle (and the CTRL_ACT register) are updated. This delay can be variable,

depending on where we are in the conversion cycle when the REFRESH command is sent.

bit 7-6

Sample_Rate<1:0>

: shows the value that is currently active since the most recent REFRESH function

was received for programmed sample rate in Normal mode (that is, if SLOW pin is not asserted)

00b

= 1024 samples/s

01b

= 256 samples/s

10b

= 64 samples/s

11b

= 8 samples/s

bit 5

SLEEP

: shows the value that is currently active since the most recent REFRESH function was received

for the SLEEP bit.

= ACTIVE mode

= SLEEP mode, no data conversion

bit 4

SING

: shows the value that is currently active since the most recent REFRESH function was received

for the single shot select bit, SING.

= Sequential scan mode

= Single-shot mode

bit 3

ALERT_PIN

: shows the value that is currently active since the most recent REFRESH function was

received for the ALERT_PIN bit.

= Disable the ALERT pin function

= Enable the ALERT pin function

bit 2

ALERT_CC

: shows the value that is currently active since the most recent REFRESH function was

received for the ALERT_CC bit.

= No ALERT on Conversion Cycle Complete

= ALERT function asserted for 5 μS on each completion of the conversion cycle

bit 1

OVF ALERT

: shows the value that is currently active since the most recent REFRESH function was

received for the OVF ALERT bit.

= No ALERT if accumulator or accumulator counter overflow has occurred

= ALERT pin triggered if accumulator or accumulator counter has overflowed

bit 0

OVF

: shows the value that is currently active since the most recent REFRESH function was received

for the OVF bit.

= No accumulator or accumulator counter overflow has occurred

= Accumulator or accumulator counter has overflowed

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