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参数资料
| 型号： | ADM1034ARQZ |
| 厂商： | ON Semiconductor |
| 文件页数： | 11/38页 |
| 文件大小： | 427K |
| 描述： | IC THERM/FAN SPEED CTRLR 16-QSOP |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi Product Discontinuation 30/Sept/2011 |
| 标准包装： | 98 |
| 功能： | 风扇控制，温度监控器 |
| 传感器类型： | 内部和外部 |
| 感应温度： | -40°C ~ 125°C，外部传感器 |
| 精确度： | ±1°C |
| 拓扑： | ADC，比较器，多路复用器，寄存器库 |
| 输出类型： | SMBus? |
| 输出警报： | 是 |
| 输出风扇： | 是 |
| 电源电压： | 3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 管件 |
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ADM1034
http://onsemi.com
11
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 9th clock pulse.
This is known as no acknowledge. The master
takes the data line low during the low period
before the 10th clock pulse, then high during the
10th clock pulse to assert a stop condition.
It is not possible to mix read and write in one operation,
because the type of operation is determined at the beginning
and cannot be changed without starting a new operation.
To write data to one of the device data registers or to read
data from it, the address pointer register (APR) must be set
so that the correct data register is addressed; then data can be
written into that register or read from it. The first byte of a
write operation always contains an address that is stored in
the APR. If data is to be written to the device, then the write
operation contains a second data byte, which is written to the
register selected by the APR.
As illustrated in Figure 17, 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 APR. The
second data byte is the data to be written to the internal data
register.
When reading data from a register there are two
possibilities.
If the ADM1034s APR value is unknown or incorrect, it
must be set to the correct value before data can be read from
the desired data register. To do this, perform a write to the
ADM1034 as before, but send only the data byte containing
the register. (See Figure 18.) A read operation is then
performed, using the serial bus address and the R/W
bit set
to 1, followed by the data byte read from the data register.
(See Figure 19.)
However, if the APR is already at the desired address, data
can be read from the corresponding data register without
first writing to the APR. In this case, Figure 18 can be
omitted.
In Figure 17 to Figure 19, the serial bus address is
determined by the state of the LOCATION pin on powerup.
Figure 17. Writing a Register Address to the Address Pointer Register, then Writing Data to the Selected Register
R/W
SCL
SDA
A2
A1
A0
D7
D6
D5
D4
D3
D2
D1
D0
ACK. BY
ADM1034
START BY
MASTER
1
9
1
ACK. BY
ADM1034
9
D7
D6
D5
D4
D3
D2
D1
D0
ACK. BY
ADM1034
STOP BY
MASTER
1
9
SCL (CONTINUED)
SDA (CONTINUED)
FRAME 1
SERIAL BUS ADDRESS BYTE
FRAME 2
ADDRESS POINTER REGISTER BYTE
FRAME 3
DATA BYTE
A3
A4
A5
A6
Figure 18. Writing to the Address Pointer Register Only (Send Byte)
SCL
SDA
A2
A1
A0
D7
D6
D5
D4
D3
D2
D1
D0
ACK. BY
ADM1034
START BY
MASTER
1
9
1
ACK. BY
ADM1034
9
STOP BY
MASTER
FRAME 1
SERIAL BUS ADDRESS BYTE
FRAME 2
ADDRESS POINTER REGISTER BYTE
R/W
A3
A4
A5
A6
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