W83627UHG Nuvoton Technology Corporation of America, W83627UHG Datasheet - Page 52
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W83627UHG
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
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Manufacturer
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Manufacturer:
Nuvoton Technology Corporation of America
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W83627UHG
7.6.2
Fan Speed Control
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: May 25, 2007
-41-
Revision 1.0
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