w83795g Winbond Electronics Corp America, w83795g Datasheet - Page 121

• Manufacturer Part Number: w83795g
• Description: Nuvoton H/w Monitor
• Manufacturer: Winbond Electronics Corp America

11.2
The W83795G/ADG is equipped with a built-in temperature sensor which uses the SBI Temperature
Sensor Interface (SB-TSI) interface. SB-TSI function is not for W83795ADG.
The SB-TSI largely follows SMBus v2.0 specification except:
SB-TSI temperature readings and limit registers encode the temperature in increments of one eighth of
a degree from 0 to 255.875. The high byte represents the integer portion of the temperature from 0 to
255. One increment in the high byte is equivalent to a step of 1°C. The upper three bits of the low byte
represent the decimal portion of the temperature. One increment of these bits is equivalent to a step of
0.125°C.
The statement “An SMBus device must always acknowledge (ACK) its own address “does not
apply since a processor may NACK on repeated start conditions even if the address matches its
own SMBus address.
Only 7-bits SMBus addresses are supported.
SB-TSI implements the Send/Receive Byte and Read/Write Byte protocols.
SB-TSI registers can only by written using a write byte command.
Address Resolution Protocol (ARP) is not implemented.
Packet Error Checking (PEC) is not supported.
SB Temperature Sensor Interface (SB-TSI)
SB-TSI Host
W83795G
Figure-3 SB-TSI Illustration
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TSID
TSIC
SB-TSI
Fan Control
W83795G/ADG
CPU
Revision 1.41
Aug/2/2010