W83627UHG Nuvoton Technology Corporation of America, W83627UHG Datasheet - Page 51

• Manufacturer Part Number: W83627UHG
• Description: IC I/O CONTROLLER 128-QFP
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83627UHG

• Applications: PC's, PDA's
• Interface: LPC
• Voltage - Supply: 3.3V, 5V
• Package / Case: 128-XFQFN
• Mounting Type: Surface Mount
• Pin Count: 128
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

W83627UHG
The W83627UHG has two output pins for fan control, each of which offers PWM duty cycle and DC
voltage to control the fan speed. The output type (PWM or DC) of each pin is configured by Bank0
Index 04h, bits 1 ~ 0.
For PWM, the duty cycle is programmed by eight-bit registers at Bank0 Index 01h and Index 03h. The
duty cycle can be calculated using the following equation:
Programmed
- 8
bit
Register
Value
=
×
Dutycycle
(%)
100
%
255
The default duty cycle is FFh, or 100%. The PWM clock frequency is programmed at Bank0 Index 00h
and Index 02h.
For DC, the W83627UHG has a six bit digital-to-analog converter (DAC) that produces 0 to 5 Volts DC.
The analog output is programmed at Bank0 Index 01h and Index 03h. The analog output can be
calculated using the following equation:
Programmed
- 6
bit
Register
Value
= AVCC
×
`
OUTPUT Voltage (V)
64
The default value is 111111YY, or nearly 5 V, and Y is a reserved bit.
Publication Release Date: March 24, 2008
-36-
Revision 1.44