UCS2112 datasheet(36/64 Pages) MICROCHIP

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UCS2112

DS20005424B-page 36

 2015 Microchip Technology Inc.

8.13

SMBus 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 8-6.

8.14

SMBus 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 used for consecutive reads of the same

8.14.1

STAND-ALONE OPERATING MODE

Stand-alone mode allows the UCS2112 to operate

without

active

SMBus/I2C

communications.

Stand-alone mode can be enabled by connecting a

pull-down resistor greater or equal to 47 k

 on the

COMM_ILIM pin as shown in Table 5-3.The SMCLK

pin should be tied to ground in this mode.

TABLE 8-6:

SEND BYTE PROTOCOL

START

Slave Address

ACK

STOP

1→0

YYYY_YYY

XXh

0 → 1

TABLE 8-7:

RECEIVE BYTE PROTOCOL

START

Slave Address

ACK

NACK

STOP

1→0

YYYY_YYY

XXh

0 → 1

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