PAC1721 datasheet(33/92 Pages) MICROCHIP

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DS-20007088A-page 33

PAC1721

5.6.7

BLOCK WRITE – I2C VERSION

Use Block Write to write multiple data bytes to a single

group of contiguous registers, as shown in Table 5-9.

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.

5.6.8

BLOCK WRITE – SMBUS VERSION

PAC1721 does not support the SMBus Block Write

functionality. Use the I2C Block Write implementation.

5.6.9

BLOCK READ – I2C VERSION

Use Block Read to read multiple data bytes from a

group of contiguous registers, as shown in Table 5-10.

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.

TABLE 5-9:

BLOCK WRITE – I2C VERSION

START

Condition

Target

Address

ACK

Address

ACK

Data

ACK

1 → 0

YYYY_YYY

XXh

Data

ACK

Data

ACK

Data

ACK

STOP

Condition

XXh

00 → 1

TABLE 5-10:

BLOCK READ – I2C VERSION

START

Condition

Target

Address

ACK

Address

ACK

START

Target

Address

ACK

Data

1 → 0

YYYY_YYY

XXh

01 → 0

YYYY_YYY

XXh

ACK

Data

ACK

Data

ACK

Data

ACK

Data

NACK

STOP

Condition

XXh

10 → 1

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