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参数资料
| 型号： | NCT1008DMT3R2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 13/20页 |
| 文件大小： | 327K |
| 描述： | TMP DIO MON/SMBUS 4CH 8WDFN |
| 标准包装： | 3,000 |
| 功能： | 温度监控系统（传感器） |
| 传感器类型： | 内部和外部 |
| 感应温度： | 0°C ~ 127°C，-64°C ~ 191°C |
| 精确度： | ±2.5°C（最小值） |
| 拓扑： | ADC（三角积分型），比较器，多路复用器，寄存器库 |
| 输出类型： | I²C?/SMBus? |
| 输出警报： | 是 |
| 输出风扇： | 是 |
| 电源电压： | 2.8 V ~ 3.6 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WFDFN |
| 供应商设备封装： | 8-WDFN（2x2） |
| 包装： | 带卷 (TR) |
NCT1008
http://onsemi.com
13
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
A2
A1
A0
D7
D6
D5
D4
D3
D2
D1
D0
ACK. BY
NCT1008
START BY
MASTER
1
9
1
ACK. BY
NCT1008
9
D7
D6
D5
D4
D3
D2
D1
D0
ACK. BY
NCT1008
STOP BY
MASTER
1
9
SCLK (CONTINUED)
SDATA (CONTINUED)
FRAME 1
SERIAL BUS ADDRESS BYTE
FRAME 2
ADDRESS POINTER REGISTER BYTE
FRAME 3
DATA BYTE
A3
A4
A5
A6
Figure 16. Writing to the Address Pointer Register Only
SCLK
SDATA
A2
A1
A0
D7
D6
D5
D4
D3
D2
D1
D0
ACK. BY
NCT1008
START BY
MASTER
1
9
1
ACK. BY
NCT1008
9
STOP BY
MASTER
FRAME 1
SERIAL BUS ADDRESS BYTE
FRAME 2
ADDRESS POINTER REGISTER BYTE
R/W
A3
A4
A5
A6
Figure 17. Reading Data from a Previously Selected Register
SCLK
SDATA
D7
D6
D5
D4
D3
D2
D1
D0
ACK.BY
NCT1008
START BY
MASTER
9
1
ACK. BY
NCT1008
9
STOP BY
MASTER
A2
A1
A0
1
FRAME 1
SERIAL BUS ADDRESS BYTE
FRAME 2
ADDRESS POINTER REGISTER BYTE
R/W
A3
A4
A5
A6
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