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参数资料
型号： ADM1029ARQZ-R7
厂商： ON Semiconductor
文件页数： 12/50页
文件大小： 402K
描述： IC SENSOR 2TEMP/FAN CTRL 24QSOP
产品变化通告： QSOP 24ld Pkg (MSL) Change 17/Jun/2010
标准包装： 1,000
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： 0°C ~ 100°C，外部传感器
精确度： ±1°C 本地，±3°C 远程
拓扑： ADC，风扇控制，寄存器库
输出类型： 开路漏极
输出警报： 是
输出风扇： 是
电源电压： 3 V ~ 5.5 V
工作温度： 0°C ~ 100°C
安装类型： 表面贴装
封装/外壳： 24-SSOP（0.154"，3.90mm 宽）
供应商设备封装： 24-QSOP
包装： 带卷 (TR)
ADM1029
http://onsemi.com
12
1. Place the ADM1029 as close as possible to the
remote sensing diode. Provided that the worst
noise sources such as clock generators,
data/address buses, and CRTs are avoided, this
distance can be 4 to 8 inches.
2. Route the D+ and D tracks close together, in
parallel, with grounded guard tracks on each side.
Provide a ground plane under the tracks if
possible.
3. Use wide tracks to minimize inductance and
reduce noise pickup. Ten mil track minimum
width and spacing is recommended.
Figure 22. Arrangement of Signal Tracks
10 MIL
10 MIL
10 MIL
10 MIL
10 MIL
10 MIL
10 MIL
GND
D
D+
GND
4. Try to minimize the number of copper/solder
joints, which can cause thermocouple effects.
Where copper/solder joints are used, make sure
that they are in both the D+ and D path and at the
same temperature.
Thermocouple effects should not be a major
problem as 1癈 corresponds to about 240 mV, and
thermocouple voltages are about 3 mV/癈 of
temperature difference. Unless there are two
thermocouples with a big temperature differential
between them, thermocouple voltages should be
much less than 200 mV.
5. Place 0.1 mF bypass and 1000 pF input filter
capacitors close to the ADM1029.
6. If the distance to the remote sensor is more than
8 inches, the use of twisted pair cable is
recommended. This will work up to about
6 to 12 feet.
7. For really long distances (up to 100 feet), use
shielded twisted pair such as Belden #8451
microphone cable. Connect the twisted pair to D+
and D and the shield to GND close to the
ADM1029. Leave the remote end of the shield
unconnected to avoid ground loops.
Because the measurement technique uses switched
current sources, excessive cable and/or filter capacitance
can affect the measurement. When using long cables, the
filter capacitor may be reduced or removed.
Cable resistance can also introduce errors. 1 W series
resistance introduces about 0.5癈 error.
Temperature-related Registers
Table 7 is a list of registers on the ADM1029 that are
specific to temperature measurement and control.
Table 7. TEMPERATURE-SPECIFIC REGISTERS
Address
Description
0x06
Temp Devices Installed
0x30
Local Temp Offset
0x31
Remote 1 Temp Offset
0x32
Remote 2 Temp Offset
0x40
Local Temp Fault Action
0x41
Remote 1 Temp Fault Action
0x42
Remote 2 Temp Fault Action
0x48
Local Temp Cooling Action
0x49
Remote 1 Temp Cooling Action
0x4A
Remote 2 Temp Cooling Action
0x80
Local Temp TMIN
0x81
Remote 1 Temp TMIN
0x82
Remote 2 Temp TMIN
0x88
Local Temp TRANGE/THYST
0x89
Remote 1 Temp TRANGE/THYST
0x8A
Remote 2 Temp TRANGE/THYST
0x90
Local Temp High Limit
0x91
Remote 1 Temp High Limit
0x92
Remote 2 Temp High Limit
0x98
Local Temp Low Limit
0x99
Remote 1 Temp Low Limit
0x9A
Remote 2 Temp Low Limit
0xA0
Local Temp Value
0xA1
Remote 1 Temp Value
0xA2
Remote 2 Temp Value
The flowchart in Figure 23 shows how to configure the
ADM1029 to measure temperature. It also shows how to
configure the ADM1029s behavior for out-of-limit
temperature measurements.
Fan Interfacing
The ADM1029 can be interfaced to many types of fan. It
can be used to control the speed of a simple two-wire fan. It
can measure the speed of a fan with a tach output, and it can
accept a logic input from fans with a FAULT output. By
means of a shorting link in the fan connector it can also
determine if a fan is present or not and if fans have been
hot-swapped.
The ADM1029 can control or monitor one or two fans.
Bits 0 and 1 of the Fans Supported In System Register (03h)
tell   the   ADM1029   how   many   fans   it   should   be
controlling/monitoring.
In the following descriptions installed means that the
corresponding bit of register 03h is set and the ADM1029
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