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参数资料
| 型号： | MON35W42 |
| 厂商： | STANDARD MICROSYSTEMS CORP |
| 元件分类： | 模拟信号调理 |
| 英文描述： | Hardware Monitoring IC with Thermal Diode Interface |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PQFP48 |
| 封装： | TQFP-48 |
| 文件页数： | 10/60页 |
| 文件大小： | 213K |
| 代理商： | MON35W42 |
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The other negative voltage input V6 (approximate -5V) also can be evaluated by a similar method and
the series resistors can be selected as R7=120K ohms and R8=56K ohms. The equation for a V6 of -
5V voltage is as follows.
V
NVIN
VREF
6
5
1
'
,(
,
.
Where
. is 120K/(120K+56K). If the monitored ADC value in the N5VIN channel is 0.8635,
VREF=3.6V and the parameter
. is 0.6818 then the negative voltage of V6 can be -5V.
Monitor temperature from thermistor:
The MON35W42 can connect to three thermistors to measure three different environment
temperatures. The specification of thermistor is: (1)
- value is 3435K, (2) resistor value is 10K ohms at
25
%C. In Figure 11, the themistor is connected by a series resistor to a 10K Ohms resistor, then to
VREF (Pin 37).
Monitor temperature from Pentium
II thermal diode or bipolar transistor 2N3904
The MON35W42 can monitor the temperature from the Pentium
II (Deschutes) thermal diode interface
or a 2N3904 transistor. The circuit is shown in Figure 12. The Pentium
II D- pin is connected to power
supply ground (GND) and the D+ pin is connected to pin PIITDx in the MON35W42. The resistor
R=30K ohms is connected to VREF to supply the diode bias current and the bypass capacitor
C=3300pF is used to filter the high frequency noise. The transistor 2N3904 is to a form a diode, the
Base (B) and Collector (C) in the 2N3904 are tied together to act as a thermal diode.
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