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| 型号： | ADM1034ARQ-REEL7 |
| 厂商： | ON Semiconductor |
| 文件页数： | 16/38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 Obsolescence 30/Sept/2009 |
| 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： | -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： | 带卷 (TR) |
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ADM1034
http://onsemi.com
16
Removing Temperature Errors
As CPUs run faster and faster, it gets more difficult to
avoid high frequency clocks when routing the D+ and D
traces around a system board. Even when the recommended
layout guidelines are followed, temperature errors attributed
to noise coupled onto the D+ and D lines remain. High
frequency noise generally gives temperature measurements
that are consistently too high. The ADM1034 has Local,
Remote 1, and Remote 2 temperature offset registers at
0x16, 0x17, and 0x18; one for each channel. By completing
a one-time calibration, the user can determine the offset
caused by the system board noise and remove it using the
offset registers. The registers automatically add a twos
compliment word to the remote temperature measurements,
ensuring correct readings in the value registers.
Table 13. OFFSET REGISTERS
Registration
Description
Default
0x16
Local Offset
0x00
0x17
Remote 1 Offset
0x00
0x18
Remote 2 Offset
0x00
Table 14. OFFSET REGISTER VALUES
Code
Offset Value
0 0000 000
0癈 (Default Value)
0 0000 001
0.125癈
0 0000 111
0.875癈
0 0001 111
1.875癈
0 0111 111
7.875癈
0 1111 111
15.875癈
1 0000 000
16癈
1 1111 000
0.875癈
Layout Considerations
Digital boards can be electrically noisy environments. Try
to protect the analog inputs from noise, particularly when
measuring the very small voltages from a remote diode
sensor. Take the following precautions:
?SPAN class="pst ADM1034ARQZ-REEL_2295499_3"> Place the ADM1034 as close as possible to the remote
sensing diode. A distance of 4 inches to 8 inches is
adequate, provided that the worst noise sources such as
clock generators, data/address buses, and CRTs are
avoided.
?SPAN class="pst ADM1034ARQZ-REEL_2295499_3"> 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.
?SPAN class="pst ADM1034ARQZ-REEL_2295499_3"> Use wide tracks to minimize inductance and reduce
noise pickup. At least 5 mil track width and spacing are
recommended.
Figure 28. Arrangement of Signal Tracks
5 MIL
5 MIL
5 MIL
5 MIL
5 MIL
5 MIL
5 MIL
GND
D
D+
GND
?SPAN class="pst ADM1034ARQZ-REEL_2295499_3"> Try to minimize the number of copper/solder joints,
because they can cause thermocouple effects. Where
copper/solder joints are used, make sure that they are in
both the D+ and D paths and at the same temperature.
Thermocouple effects are not a major problem because
1癈 corresponds to approximately 200 mV, and
thermocouple voltages are approximately 3 mV/癈 of
temperature difference. Unless there are two
thermocouples with a big temperature differential
between them, the voltages should be much less than
200 mV.
?SPAN class="pst ADM1034ARQZ-REEL_2295499_3"> Place a 0.1 mF bypass capacitor close to the ADM1034.
?SPAN class="pst ADM1034ARQZ-REEL_2295499_3"> If the distance to the remote sensor is more than
8 inches, twisted pair cable is recommended. This
works up to about 6 feet to 12 feet.
?SPAN class="pst ADM1034ARQZ-REEL_2295499_3"> For very 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 ADM1034. 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 C1 may be reduced or removed. In any case,
the total shunt capacitance should never exceed 1000 pF.
Noise Filtering
For temperature sensors operating in noisy environments,
common practice is to place a capacitor across the D+ and
D pins to help combat the effects of noise. However, large
capacitances affect the accuracy of the temperature
measurement, leading to a recommended maximum
capacitor value of 1000 pF. While this capacitor reduces the
noise, it does not eliminate it, making it difficult to use the
sensor in a very noisy environment.
The ADM1034 has a major advantage over other devices
when it comes to eliminating the effects of noise on the
external sensor. The series resistance cancellation feature
allows a filter to be constructed between the external
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