NCT1008DMT3R2G【PDF 13/20 页】TMP DIO MON/SMBUS 4CH 8WDFN

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Sheet目录45

9页 10页 11页 12页 [13页]14页 15页 16页 17页

NCT1008

http://onsemi.com

3. When all data bytes have been read or written,

stop conditions are established. In write mode, the

master pulls the data line high during the tenth

clock pulse to assert a stop condition. In read

mode, the master device overrides the

acknowledge bit by pulling the data line high

during the low period before the ninth clock pulse.

This is known as no acknowledge. The master

takes the data line low during the low period

before the tenth clock pulse, then high during the

tenth clock pulse to assert a stop condition.

Any number of bytes of data are transferable over

the serial bus in one operation, but it is not

possible to mix read and write in one operation

because the type of operation is determined at the

beginning and cannot subsequently be changed

without starting a new operation. For the

NCT1008, write operations contain either one or

two bytes, while read operations contain one byte.

To write data to one of the device data registers, or to read

data from it, the address pointer register must be set so that

the correct data register is addressed. The first byte of a write

operation always contains a valid address that is stored in the

address pointer register. If data is to be written to the device,

the write operation contains a second data byte that is written

to the register selected by the address pointer register.

This procedure is illustrated in Figure 15. The device

address is sent over the bus followed by R/W

set to 0. This

is followed by two data bytes. The first data byte is the

address of the internal data register to be written to, which

is stored in the address pointer register. The second data byte

is the data to be written to the internal data register.

Figure 15. Writing a Register Address to the Address Pointer Register, then Writing Data to the Selected Register

R/W

SCLK

SDATA

ACK. BY

NCT1008

START BY

MASTER

ACK. BY

NCT1008

ACK. BY

NCT1008

STOP BY

MASTER

SCLK (CONTINUED)

SDATA (CONTINUED)

FRAME 1

SERIAL BUS ADDRESS BYTE

FRAME 2

ADDRESS POINTER REGISTER BYTE

FRAME 3

DATA BYTE

Figure 16. Writing to the Address Pointer Register Only

SCLK

SDATA

ACK. BY

NCT1008

START BY

MASTER

ACK. BY

NCT1008

STOP BY

MASTER

FRAME 1

SERIAL BUS ADDRESS BYTE

FRAME 2

ADDRESS POINTER REGISTER BYTE

R/W

Figure 17. Reading Data from a Previously Selected Register

SCLK

SDATA

ACK.BY

NCT1008

START BY

MASTER

ACK. BY

NCT1008

STOP BY

MASTER

FRAME 1

SERIAL BUS ADDRESS BYTE

FRAME 2

ADDRESS POINTER REGISTER BYTE

R/W

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