ICS9148-47 datasheet(3/9 Pages) ICST

tên linh kiện	ICS9148-47

Giải thích chi tiết về linh kiện	Pentium/ProTM System Clock Chip

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ICS9148-47

General I

2C serial interface information

The information in this section assumes familiarity with I2C programming. For more information, contact ICS for an I2C

programming application note.

How to Write:

Send the address D2(H) .

Send two additional dummy bytes, a command code

and byte count.

Send the desired number of data bytes.

See the diagram below:

Note that the acknowledge bit is sent by the clock chip, and pulls the data line low. There is no minimum of data bytes that must

be sent.

How to Read:

Send the address D3(H).

Send the byte count in binary coded decimal

Read back the desired number of data bytes

See the diagram below:

The following specifications should be observed:

Operating voltage for I2C pins is 3.3V

Maximum data transfer rate (SCLK) is 100K bits/sec.

Clock Generator

Address (7 bits)

ACK

+ 8 bits

dummy

command code

ACK

+ 8 bits

dummy Byte

count

ACK

Data Byte

ACK

Data Byte

ACK

A(6:0) & R/W#

D2(H)

Clock Generator

Address (7 bits)

ACK

Byte

Count

ACK

Data Byte

ACK

Data Byte

A(6:0) & R/W#

D3(H)

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