PAC1941T-1ESLASH4MX. datasheet(38/96 Pages) MICROCHIP

38 / 96 page

PAC194X

DS20006543A-page 38

 2021 Microchip Technology Inc.

6.6.5

SEND BYTE

The Send Byte protocol is used to set the internal

address register pointer to the correct address loca-

tion. No data are transferred during the Send Byte

protocol, as shown in Table 6-7.

6.6.6

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 6-8.

When an ACK is received after the register data, the

address pointer automatically increments.

When a NACK is received after the register data, the

address pointer stays at the same position.

If the host wishes to continue clocking and reading the

next register, the host 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. Alter-

natively, you may set bit 0 in Register 7-10 and the

pointer will not skip the addresses associated with the

inactive channels. The measurement data for these

inactive channels will read FFh.

6.6.7

BLOCK WRITE – I2C VERSION

Block Write is used to write multiple data bytes from a

from a group of contiguous registers, as shown in

Table 6-9. The PAC194X supports I2C Block Write by

default, the SMBus format is not supported.

If an invalid register address is specified, the client will

ACK its address but NACK the register address.

The host will NACK the data received from the client

by holding the SMBus data line high after the eighth

data bit is sent.

6.6.8

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 6-10. The PAC194X supports I2C Block Read by

default, but the SMBus format can also be supported

(see Table 6-11).

If an invalid register address is specified, the client will

ACK its address but NACK the register address.

The host will NACK the data received from the client

by holding the SMBus data line high after the eighth

data bit is sent.

TABLE 6-7:

SEND BYTE PROTOCOL

START

Client Address

ACK

STOP

1 → 0

YYYY_YYY

XXh

0 → 1

TABLE 6-8:

RECEIVE BYTE PROTOCOL

START

Client Address

ACK

NACK

STOP

1 → 0

YYYY_YYY

XXh

0 → 1

TABLE 6-9:

BLOCK WRITE PROTOCOL – I2C VERSION (DEFAULT)

START

Client Address

ACK

Address

ACK

1 → 0

YYYY_YYY

XXh

Data

ACK

Data

ACK

Data

ACK

STOP

XXh

0 → 1

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