PAC1721 datasheet(32/92 Pages) MICROCHIP

32 / 92 page

PAC1721

DS-20007088A-page 32

 2026 Microchip Technology Inc. and its subsidiaries

5.6.4

READ BYTE

Use the Read Byte to read one byte of data from the

specified register address, as shown in Table 5-6.

If an invalid register address is specified, the target

ACKs its address, but NACKs the register address.

The host NACKs the data received from the target by

holding the SMBus data line high after the 8th data bit

is sent.

5.6.5

SEND BYTE

Use the Send Byte to set the internal register pointer to

the correct address location. No data is transferred

during the Send Byte, as shown in Table 5-7.

5.6.6

RECEIVE BYTE

Use the Receive Byte to read data from a register when

the internal register pointer is known to be at the correct

address location. For example, when the address is set

via the Send Byte. This is shown in Table 5-8.

Note:

If the BYTE_COUNT bit is set to 1b in the

SMBUS_SETTINGS register, PAC1721

reports the byte count. This does not

comply with SMBus specifications.

After receiving the register data, if an ACK is received,

the internal register pointer automatically increments.

If instead a NACK is received, then the internal address

pointer remains at the same position.

To continue clocking and reading the next register, the

host sends an ACK after the register data, instead of

sending a NACK followed by a STOP condition.

TABLE 5-6:

READ BYTE

START

Condition

Target

Address

ACK

Address

ACK

START

Condition

1 → 0

YYYY_YYY

XXh

01 → 0

Target

Address

ACK

Data

NACK

STOP Condition

YYYY_YYY

XXh

10 → 1

TABLE 5-7:

SEND BYTE

START

Condition

Target

Address

ACK

Address

ACK

STOP

Condition

1 → 0

YYYY_YYY

XXh

00 →1

TABLE 5-8:

RECEIVE BYTE

START

Condition

Target

Address

ACK

NACK

STOP

Condition

1 → 0

YYYY_YYY

XXh

10 → 1

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