UCS1002-3 datasheet(102/114 Pages) MICROCHIP

102 / 114 page

UCS1002-3

DS20006852A-page 102

 2023 Microchip Technology Inc. and its subsidiaries

11.2.3

SMBUS PROTOCOLS

The UCS1002-3 is SMBus 2.0-compatible and

supports Write Byte, Read Byte, Send Byte, and

Receive Byte as valid protocols as shown in the

following sections.

All protocols in these sections use the convention in

Table 11-3.

11.2.3.1

SMBus Write Byte

The Write Byte is used to write one byte of data to a

specific register as shown in Table 11-4.

11.2.3.2

SMBus Read Byte

The Read Byte protocol is used to read one byte of data

from the registers as shown in Table 11-5.

11.2.3.3

SMBus Send Byte

The Send Byte protocol is used to set the internal

address register pointer to the correct address location

as shown in Table 11-6. No data is transferred during

the Send Byte protocol.

11.2.3.4

SMBus Receive Byte

The Receive Byte protocol is used to read data from a

known to be at the right location (for example, set via

Send Byte). This is used for consecutive reads of the

same register, as shown in Table 11-7.

TABLE 11-3:

PROTOCOL FORMAT

Data Sent to Device

Data Sent to the Host

Data sent

TABLE 11-4:

WRITE BYTE PROTOCOL

START

Client

Address

ACK

Address

ACK

Data

ACK

STOP

1 → 0

YYYY_YYY

XXh

0 → 1

TABLE 11-5:

READ BYTE PROTOCOL

START

Client

Address

ACK

Address

ACK

START

Client

Address

ACK

Data

NACK

STOP

→ 0

YYYY_YYY

XXh

→ 0

YYYY_YYY

XXh

→ 1

TABLE 11-6:

SEND BYTE PROTOCOL

START

Client Address

ACK

Address

ACK

STOP

1 → 0

YYYY_YYY

XXh

0 → 1

TABLE 11-7:

RECEIVE BYTE PROTOCOL

START

CLIENT

ADDRESS

ACK

NACK

STOP

1 → 0

YYYY_YYY

XXh

0 → 1

UCS1002-3 Datasheet(PDF) 102 Page - Microchip Technology

UCS1002-3 Datasheet(HTML) 102 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL