W83L785R 데이터 시트보기 (PDF) - Winbond

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W83L785R

Winbond H/W Monitoring IC

Winbond 

W83L785R/W83L785G

6.5.1 Monitor temperature from thermistor:

The W83L785R/G can connect two thermistors to measure three different environment temperature or

remote temperature. The specification of thermistor should be considered to (1) β value is 3435K, (2)

resistor value is 10K ohms at 25°C. In the Figure 3, the themistor is connected by a serial resistor with

10K Ohms, and then connected to VREF (pin 17).

6.5.2 Monitor temperature from Pentium IITM thermal diode

The W83L785R/G can alternate the thermistor to Pentium IITM (Deschutes) thermal diode interface

and the circuit connection is shown as Figure 4. The pin of Pentium IITM D- is connected to power

supply ground (GND) and the pin D+ is connected to pin PIIx in the W83L785R/G. The resistor R=15K

ohms should be connected to VREF to supply the diode bias current and the bypass capacitor

C=3300pF should be added to filter the high frequency noise.

Pentium II/III

CPU

D+

Therminal

Diode

D-

Pentium II/III

CPU

D+

Therminal

Diode

D-

R=15K, 1%

R=15K, 1%

C=3300pF

VREF

PIITDx

W83L785R

C=3300pF

PIITDx

Figure 4.

6.5.3 Over Temperature signal (OVT#)

W83L785R/G provides two external thermal sensors to detect temperature. When detected

temperature exceeds the over-temperature value, pin OVT# will be asserted until the temperature

goes below the hysteresis temperature. Pin OVT# has 2 operating modes.

6.5.3.1. Comparator Mode:

At this mode, temperature exceeding TO causes the OVT# output activated until the temperature is

less than THYST. (Figure 5)

Publication Release Date: Apr. 2006

-9-

Revision 1.1

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