W83627EG Nuvoton Technology Corporation of America, W83627EG Datasheet - Page 52

• Manufacturer Part Number: W83627EG
• Description: IC I/O CONTROLLER 128-QFP
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83627EG

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

W83627EHF/EF, W83627EHG/EG
Nominal
Time per
Counts
70% RPM
Time for 70%
Divisor
RPM
Revolution
128
68
872.64 ms
48
1246.72 ms
153
Table 7.2
7.4.2
Fan speed control
W83627EHF/EHG provides two controllable methods for Fan speed control. One is PWM duty cycle
output and the other is DC voltage output. Either PWM or DC output can be programmed at Bank0
Index 04h.bit1~0, Index 12h.bit0 and Index 62h.bit6.
7.4.2.1.
PWM Duty Cycle Output
The W83627EHF/EHG provides maximum 4 sets for fan PWM speed control. The duty cycle of PWM
can be programmed by a 8-bit registers which are defined in the Bank0 Index 01h, Index 03h, Index
11h and Index 61h. The default duty cycle is set to 100%, that is, the default 8-bit registers is set to FFh.
The expression of duty can be represented as follows.
Programmed
- 8
bit
Register
Value
=
×
Dutycycle
(%)
100
%
255
The PWM clock frequency also can be program and defined in the Bank0 Index 00h, Index 02h, Index
10h and Index 60h.
7.4.2.2.
DC Voltage Output
The W83627EHF/EHG has a 6 bit DAC which produces 0 to 3.3 volts DC output that provides
maximum 4 sets for fan speed control. The analog output can be programmed in the Bank0 Index 01h,
Index 03h, Index 11h and Index 61h. The default value is 111111YY,YY is reserved 2 bits, that is
default output value is nearly 3.3 V. The expression of output voltage can be represented as follow ,
Programmed
6
-
bit
Register
Value
= VCC
×
(
)
3
OutputVolt
age
V
64
7.5
Conversion Sequence and Conversion Time
The conversion sequence and conversion time of the W83627EHF/EHG include the voltage and
temperature conversion time. The sample rate of the W83627EHF/EHG is 22.5 KHz. 24 cycles are
needed to complete the ADC conversion of the temperature (worst case), and 16 cycles are needed for
the ADC conversion of the voltage. The W83627EHF/EHG has 10 voltage sets and 3 temperature sets.
Publication Release Date: April 7, 2009
-41-
Version 1.94