W83792AG Nuvoton Technology Corporation of America, W83792AG Datasheet - Page 31

• Manufacturer Part Number: W83792AG
• Description: IC MONITOR H/W 48-LQFP
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83792AG

• Output Type: I²C™
• Function: Hardware Monitor
• Topology: ADC, Fan Control, Register Bank
• Sensor Type: External
• Sensing Temperature: External Sensor
• Output Alarm: Yes
• Output Fan: Yes
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP
• Temperature Sensor Function: Temp Sensor
• Resolution: 10b
• Operating Temperature (min): 0C
• Operating Temperature Classification: Commercial
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

7.7.4.1. Temperature Measurement Machine
sensor 2/3. The 8-bit temperature data can be obtained by reading the CR[27h]. The 9-bit temperature
data can be obtained by reading the 8 MSBs from the bank0 CR[C0/ C8h] and the LSB from the
bank0 CR[C1/C9h] bit 7. The format of the temperature data is show in Table 3.
7.7.4.2. Monitor temperature from thermistor:
temperatures. 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 11, the thermistor is connected by a serial resistor with 10K
Ohms(1% error), then connect to VREF (Pin 37).
7.7.4.3. Monitor temperature from Pentium IVTM thermal diode or bipolar transistor 2N3904
The W83792D/G can alternate the thermistor to Pentium IV
2N3904 and the circuit connection is shown as Figure 11. The pin of Pentium IV
power supply ground (GND) and the pin D+ is connected to pin VTINx in the W83792D/G. The resistor
R=30K 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. The transistor 2N3904 should be
connected to a form with a diode, that is, the Base (B) and Collector (C) in the 2N3904 should be tied
together to act as a thermal diode.
+125°C
+25°C
+1°C
+0.5°C
+0°C
TEMPERATURE
The temperature data format is 8-bit two-complement for sensor 1 and 9-bit two-complement for
The W83792D/G can be connected three thermistors to measure three different environmental
P entium IV
T em perature S en sor
T herm inal
B ipolar T ransistor
C P U
B
D iode
O R
8-BIT BINARY
C
E
0111,1101
0001,1001
0000,0001
0000,0000
2N 3904
8-BIT DIGITAL OUTPUT
-
D +
D -
F igure 9.
R =15 K , 1%
8-BIT HEX
Table 3.
- 25 -
R =1 5K , 1%
7Dh
19h
01h
00h
-
C = 3300p F
C =33 00pF
V R E F
P IV T D x
P IV T D x
TM
W 83792D
9-BIT BINARY
Publication Release Date: April 26, 2006
thermal diode interface or transistor
0,1111,1010
0,0011,0010
0,0000,0010
0,0000,0001
0,0000,0000
W83792AD/AG/D/G
9-BIT DIGITAL OUTPUT
TM
D- is connected to
9-BIT HEX
0FAh
032h
002h
001h
000h
Revision 0.9