W83627UHG Nuvoton Technology Corporation of America, W83627UHG Datasheet - Page 40

• 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

7.2.2
The I
block. The interface is totally compatible with the industry-standard I
components that are also compatible to read the internal registers of the W83627UHG hardware
monitor and control fan speeds. The address of the I
index 48h (which is accessed by the index/data pair at I/O address typically at 295h/296h).
The two timing diagrams below illustrate how to use the I
and how to read the value in an internal register, respectively.
(a) Serial bus write to internal address register followed by the data byte
SCL
SDA
2
C interface is a second, parallel port into the internal registers of the hardware monitor function
Start By
Master
Figure 7-2 Serial Bus Write to Internal Address Register Followed by the Data Byte
I
2
C Interface
0
0
1
Serial Bus Address Byte
0
SCL
SDA (Continued)
Frame 1
1
(Continued)
1
0
1
R/W
7
0
D7
627UHG
-29-
Ack
by
8
D6
2
C peripheral is set by the register located at
0
D7
D5
2
C interface to write to an internal register
D6
D4
Internal Index Register Byte
D3
Publication Release Date: May 25, 2007
D5
Data Byte
Frame 3
Frame 2
2
C specification, allowing external
D4
D2
D3
D1
W83627UHG
D2
7
D0
Ack
784R
627UHG
by
D1
8
Ack
by
7
D0
Stop
Master
by
Revision 1.0
627UHG
8
Ack
by