PAC1932T-ISLASHJQ. datasheet(30/62 Pages) MICROCHIP

30 / 62 page

PAC1932/3/4

DS20005850C-page 30

 2017-2018 Microchip Technology Inc.

5.6.4

READ BYTE

The Read Byte protocol is used to read one byte of data

from the registers, as shown in Table 5-6.

If an invalid register address is specified, the slave will

ACK its address but NACK (not acknowledge) the

The master will NACK the data received from the slave

by holding the SMBus data line high after the eighth

data bit has been sent.

5.6.5

SEND BYTE

The Send Byte protocol is used to set the internal

address register pointer to the correct address location.

No data is transferred during the Send Byte protocol,

as shown in Table 5-7.

5.6.6

RECEIVE BYTE

The Receive Byte protocol is used to read data from a

known to be at the right location (e.g., set via Send

Byte). This is shown in Table 5-8.

When an ACK is received after the REGISTER DATA,

then the address pointer automatically increments.

When a NACK is received after the REGISTER DATA,

then the address pointer stays at the same position.

If the master wishes to continue clocking and read the

next register, the master will ACK after the register

data, instead of sending NACK followed by STOP.

If some channels are deactivated, their data registers

will be skipped by the auto-incrementing pointer.

Alternatively, you may set bit 0 in Register 6-10

CHANNEL_DIS and SMBus (Address 1Ch) and the

pointer will not skip the addresses associated with the

inactive channels. The measurement data for these

inactive channels will read FFh.

TABLE 5-6:

READ BYTE PROTOCOL

START

Slave

Address

ACK

Address

ACK

START

Slave Address

ACK

NACK

STOP

 0

YYYY_YYY

XXh

 0

YYYY_YYY

XXh

 1

TABLE 5-7:

SEND BYTE PROTOCOL

START

Slave Address

ACK

STOP

 0

YYYY_YYY

XXh

 1

TABLE 5-8:

RECEIVE BYTE PROTOCOL

START

Slave Address

ACK

NACK

STOP

 0

YYYY_YYY

XXh

 1

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