PAC1941T-1ESLASH4MX. datasheet(31/96 Pages) MICROCHIP

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DS20006543A-page 31

PAC194X

5.15.4

SINGLE-SHOT MODE

The Control register also allows the device to operate

in Single-Shot mode. In this mode, all active channels

will sample and convert, followed by results being cal-

culated. The accumulator and accumulator count

operate the same as for Continuous Conversion

mode, accumulating each single-shot power calcula-

tion and incrementing the accumulator count. The con-

version cycle will start when the REFRESH command

(or REFRESH_V/REFRESH_G) is sent.

After the single-shot measurements and calculations

are complete, the device goes into Sleep mode. A

REFRESH, REFRESH_G or REFRESH_V command

may be sent to read the data. The user needs to wait

about 2 ms after the REFRESH command before com-

manding another single-shot conversion, by means of

sending one of the REFRESH commands. This is

because a 1 ms delay is required between REFRESH

commands and coming out of Sleep requires 1 ms

(band gap start-up delay). In general, single-shot com-

mands are not this close together in time; instead, one

of the lower sampling rates is used.

There is an option to use a single REFRESH

command to collect eight samples and average them

in Single-Shot 8X mode. This reduces noise and offset

in the result (see Register 7-2). In this mode, all eight

samples are added to the accumulator and the accu-

mulator count is incremented by eight each time a

REFRESH is sent to trigger an additional Single-Shot

8X acquisition and conversion.

In Single-Shot 8X mode, the 8X averaged result is

read from the 8X averaged registers (Register 7-7 and

(Register 7-5 and Register 7-6) hold the last of the 8

samples.

5.16

ALERT Functionality

The ALERT functionality has multiple purposes: to

notify the system that a conversion cycle for all active

channels is complete, to notify the system that the

accumulator or accumulator count has overflowed or

that an electrical parameter is outside the programmed

limit.

Alerts will cause the ALERT pin to be asserted low and

latched low. The only exception to this is for the

ALERT after COMPLETE CONVERSION, this will

cause a 5 µs pulse of the ALERT pin. Alerts are set at

the end of the round robin cycle.

5.16.1

ALERT AFTER COMPLETE

CONVERSION

and

have

bits

ALERT_CC1 and ALERT_CC2 that can be used to

enable the ALERT_CC function. If this bit is set, the

assigned ALERT pin goes low for 5 µs after each

round robin conversion cycle is complete. This

function may be used when you want to read data

continuously as soon as each round robin conversion

cycle is complete.

This Conversion Complete ALERT does not set a bit in

5.16.2

ALERT PIN ASSIGNMENTS

The ALERT function may be assigned to either the

SLOW/ALERT1 pin or the GPIO/ALERT2 pin. Use

the ALERT functions to these pins.

To configure the SLOW/ALERT pin to function as

ALERT, use Register 7-2. Note that the SLOW func-

tion of this pin cannot be used once the ALERT

function is programmed for this pin.

There is a general ALERT signal on bit 5 of the SMBus

Settings (1Ch). This register bit can be monitored over

the I2C/SMBus or monitored on the ALERT/SLOW, as

mentioned above. This register does not require a

Refresh signal to update the values, so it is easy to

poll if the user desires.

5.16.3

USING THE ALERT PINS AS I/O

PINS

The ALERT pins may also be used as I/O pins. This

functionality is enabled in Register 7-2. When used as

an I/O pin, there are bits for holding input and output

data (read or to be written) in Register 7-10. This

input data may be read or the output data changed

without affecting anything else.

Note:

When using the device in single-channel

Burst mode, the Conversion Complete

ALERT will not assert.

PAC1941T-1E/4MX. Datasheet(PDF) 31 Page - Microchip Technology

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