W83627DHG Nuvoton Technology Corporation of America, W83627DHG Datasheet - Page 45

• Manufacturer Part Number: W83627DHG
• Description: IC I/O CONTROLLER 128-QFP
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83627DHG

• Applications: PC's, PDA's
• Interface: LPC
• Voltage - Supply: 3.3V
• Package / Case: 128-XFQFN
• Mounting Type: Surface Mount
• Pin Count: 128
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Eight-bit temperature data is read from Index[27h]. For nine-bit temperature data, the 8 MSB are read
from Bank1 / Bank2 Index[50h], and the LSB is read from Bank1 / Bank2 Index[51h], bit 7.
There are two sources of temperature data: external thermistors or thermal diodes.
External thermistors should have a β value of 3435K and a resistance of 10 KΩ at 25°C. As illustrated
in the schematic below, the thermistor is connected in series with a 10-KΩ resistor and then connects
to VREF (pin 101).
7.3.3.2.
The thermal diode D- pin is connected to CPUD-(pin 105), and the D+ pin is connected to the
temperature sensor pin in the W83627DHG. A 15-KΩ resistor is connected to VREF to supply the bias
current for the diode, and the 2200-pF, bypass capacitor is added to filter high-frequency noise.
7.3.3.1.
Monitor Temperature from Thermal Diode (Voltage Mode)
Monitor Temperature From Thermistor
10K@25 C, beta=3435K
Therminal
Diode
R THM
D+
D-
10K, 1%
R
R=15K,1%
AGND
C=2200pF
-33-
AUXTIN
CPUTIN
SYSTIN
VREF
Pin 101
Pin 102
Pin 103
Pin 104
Publication Release Date: Aug, 22, 2007
VREF
W83627DHG
(SYSTIN)
CPUTIN
(AUXTIN)
CPUD-(AGND)
W83627DHG
W83627DHG
Version 1.4