G760A View Datasheet(PDF) - Unspecified
Part Name
Description
Manufacturer
G760A Datasheet PDF : 5 Pages
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Global Mixed-mode Technology Inc.
G760A
Internal Registers
This IC provides 3 SMBus registers.
1.Programmed fan speed register:(SET_CNT,address:00b)
This register is a read/write register, it contains the
count number of the desired fan speed. Power up
default is FFh.
2.Actual fan speed register: (ACT_CNT, address: 01b)
This register is read only. It contains the count number of
the actual fan speed. Power up default is FFh.
3.Fan status register: (FAN_STA , address : 10b)
This register is read only. Its bit 0 is set to 1 when
the actual fan speed is ±20% outside the desired
speed. Its bit 1 is set to 1 when fan speed is be-
low
1920 rpm. Power up default is 10b.
SMBus Address
The SMBus address of this chip is fixed to7Ch (01111100b) for write and 7Dh(01111101b) for read.
SMBus Timing
SMBCLK
1
91
9
SMBDATA
0 1 1 1 1 1 0 R/W
0 0 0 0 0 0 D1 D0
Start
by
Master
Address Byte
Ack
by
G760
Pointer Byte
Ack
by
G760
1
91
9
0 1 1 1 1 1 0 R/W
D7 D6 D5 D4 D3 D2 D1 D0
Repeat
Start
by
Master
Address Byte
Ack
by
G760
Data Byte
(a) Typical Pointer Set Followed by Immediate Read
No Ack
by
Master
Stop
Cond
by
Master
SMBCLK
1
91
9
SMBDATA
01
Start
by
Master
11 11
Address Byte
0 R/W
D7 D6 D5 D4 D3 D2 D1 D0
Ack
by
G760
Data Byte
No Ack Stop
by Cond
Master by
Master
(b) Typical 1-Byte Read with Preset Pointer
SMBCLK
1
91
9
1
9
9
SMBDATA
01
Start
by
Master
11 11
Address Byte
0 R/W
0 0 0 0 0 0 D1 D0
0 1 1 1 1 1 0 R/W
D7 D6 D5 D4 D3 D2 D1 D0
Ack
by
G760
Pointer Byte
Ack
by
G760
Address Byte
Ack
by
G760
Data Byte
No Ack
by
Master
Stop
Cond
by
Master
(a) Typical Pointer Set Followed by Immediate Read
1
91
91
9
SMBCLK
SMBDATA
0 1 1 1 1 1 0 R/W
0 0 0 0 0 0 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
Start
by
Master
Address Byte
Ack
by
G760
Pointer Byte
Ack
by
Master
Configuration Byte
Ack
by
G760
Stop
Cond
by
Master
(b) Register Write
Ver 4.3
Oct 28, 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
4
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