UCS2113 datasheet(31/62 Pages) MICROCHIP

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DS20005680B-page 31

UCS2113

7.13

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 7-6.

7.14

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

7.14.1

STAND-ALONE OPERATING MODE

Stand-Alone mode allows the UCS2113 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.

Note:

The SMBus Send Byte command is

expected to be followed by the SMBus

Receive Byte command. When two

SMbus Send Byte commands are sent in

a row, the first command receives an ACK

and will be processed by the UCS2113,

but the second command receives a

NACK and will be ignored.

TABLE 7-6:

SEND BYTE PROTOCOL

START

Client Address

ACK

STOP

1→0

YYYY_YYY

XXh

0 → 1

TABLE 7-7:

RECEIVE BYTE PROTOCOL

START

Client Address

ACK

NACK

STOP

1→0

YYYY_YYY

XXh

0 → 1

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