PAC1932SLASH3SLASH4 datasheet(36/62 Pages) MICROCHIP

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PAC1932/3/4

DS20005850C-page 36

 2017-2018 Microchip Technology Inc.

bit 4

SING

: setting this bit to 1 puts the device in Single-shot mode. After writing this bit and sending a

REFRESH command, the device resets the accumulators and performs one conversion cycle for any

and all active channels, then returns to sleep mode. Another REFRESH command, without changing

this bit, will perform another single-shot command. When the bit is cleared, sending a REFRESH

command resets the accumulators and causes the device to start converting in the sequential scan

mode for active channels. A REFRESH_V command may be used instead of REFRESH to move in and

out of Single Shot mode without resetting the accumulators and accumulator count.

= Sequential scan mode

= Single-shot mode

bit 3

ALERT_PIN

: setting this bit to 1 causes the SLOW pin to function as an ALERT pin (active low output

pin). If this bit is set to 1, the ALERT pin can be triggered by conversion complete if bit 2 is set.

If this bit is set to 1, and the Overflow ALERT enable bit is set to 1, the ALERT pin will be triggered by

accumulator or accumulator count overflow (see bit 1 and bit 0 descriptions directly below).

Note that bit 3 only determines the functionality of this pin, SLOW or ALERT, it does not influence the

ALERT functionality. If there is a pull-up resistor connected to the pin for ALERT functionality, the device

will initially power-up in SLOW mode. Once bit 3 is set to enable ALERT functionality, the conversion

rate will change to either the default or programmed value.

= Disable the ALERT pin function

= Enable the ALERT pin function

bit 2

ALERT_CC

: setting this bit to 1 causes the ALERT pin to be asserted for 5 μS at the end of each

conversion cycle.

= No ALERT on Conversion Cycle Complete

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

Note:

If this bit and the OVF ALERT bit are set, OVF ALERT dominates. EOC alerts will not be

seen on the ALERT pin if OVF ALERT = 1.

bit 1

OVF ALERT

: Overflow ALERT enable. If this bit is set and any of the accumulators or the accumulator

counter overflow, the ALERT function will be triggered. This will be reflected in bit 0 of this register, and

if bit 3 is set to 1, the ALERT pin will be triggered (sent low).

The ALERT function is cleared by REFRESH or REFRESH_G.

= no ALERT if accumulator or accumulator counter overflow has occurred.

= ALERT pin triggered if accumulator or accumulator counter has overflowed

If this bit and the ALERT_CC bit are set, OVF ALERT dominates. EOC alerts will not be seen on the

ALERT pin if OVF ALERT =1.

bit 0

OVF

: Overflow indication status bit, this bit will be set to 1 if any of the accumulators or the accumulator

counter overflows.This bit is by cleared REFRESH or REFRESH_G. These commands also clear the

ALERT function.

= no accumulator or accumulator counter overflow has occurred.

= accumulator or accumulator counter has overflowed

CTRL REGISTER (ADDRESS 01H) (CONTINUED)

PAC1932/3/4 数据表(PDF) 36 Page - Microchip Technology

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