PAC1934 datasheet(31/64 Pages) MICROCHIP

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 2017-2019 Microchip Technology Inc.

DS20005850E-page 31

PAC1931/2/3/4

5.6.7

BLOCK READ – I2C VERSION

Block Read is used to read multiple data bytes from a

from a group of contiguous registers, as shown in

Table 5-9. The PAC1931/2/3/4 supports I2C Block

Read by default, but the SMBus format can also be

supported (see Table 5-10).

If an invalid register address is specified, the slave will

ACK its address but NACK the register address.

The master will NACK the data received from the slave

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

bit has been sent.

5.6.8

BLOCK READ – SMBUS VERSION

PAC1931/2/3/4 can also support the SMBus version of

Block Read. If the Byte Count bit is set, Block Read will

result in the device sending the Byte Count data before

the first data byte. This protocol is shown in Table 5-10.

Also see Section 4.3 “Conversion Cycle Controls”

above and Register 6-10 CHANNEL_DIS and SMBus

(Address 1Ch).

TABLE 5-9:

BLOCK READ PROTOCOL I2C VERSION (DEFAULT)

START

Slave Address

ACK

Address

ACK

START

Slave Address

ACK

Data

0

YYYY_YYY

XXh

0

YYYY_YYY

XXh

ACK

Data

ACK

Data

ACK

Data

NACK

STOP

XXh

 1

TABLE 5-10:

BLOCK READ PROTOCOL SMBUS VERSION (MUST SET BYTE COUNT BIT)

START

Slave Address

ACK

Address

ACK

START

Slave Address

ACK

Byte Count

0

YYYY_YYY

XXh

0

YYYY_YYY

XXh = N

ACK

Data

ACK

Data

ACK

Data

NACK

STOP

XXh

 1

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