Datasheet
Features
Dual-Core Intel
®
Xeon
®
Processor 7000 Series Datasheet 83
NOTES:
1. Bit 3 of Configuration register 1 must be set to 0 (default value is 0)
2. Writing to RESERVED bits may cause unexpected results. RESERVED bits that must be correctly
programmed are identified in the register definitions in the following section. Reading from RESERVED bits
will return unknown values.
3. The 4 least significant bits of the thermal sensor die revision code may change and should not be used for
identification
4. Ch. 1 limit registers have a separate 7-bit read and write address while channel 2 limit registers have the
same 7-bit address for read and write.
All of the commands in Table 7-10 are for reading or writing registers in the SMBus thermal
sensor, except the one-shot register (0Fh). The one-shot command forces the start of a new
conversion cycle. If a conversion is in progress when the one-shot command is received, then the
command is ignored. If the thermal sensor is in stand-by mode when the one-shot command is
received, a conversion is performed and the sensor returns to stand-by mode. The one-shot
command is not supported when the thermal sensor is in auto-convert mode.
Table 7-10. SMBus Thermal Sensor Command Byte Assignments
Register Command R/W Reset State
RESERVED
2
00h N/A RESERVED
Ch. 1 Temp. Value
1
01h R 0000 0000
Status Register 1 02h R Undefined
Configuration Register 03h R 0000 0000
Conversion Rate Register 04h R 0000 0111
RESERVED
2
05h - 06h N/A RESERVED
Ch. 1 Temp. High Limit
1
07h R 0101 0101
Ch. 1 Temp. Low Limit
1
08h R 0000 0000
Configuration Register 1 09h W 0000 0000
Conversion Rate Register 0Ah W 0000 0111
RESERVED
2
0Bh - 0Ch N/A RESERVED
Ch. 1 Temp. High Limit
1
0Dh W 0101 0101
Ch. 1 Temp. Low Limit
1
0Eh W 0000 0000
One-shot 0Fh W N/A
RESERVED
2
10h N/A RESERVED
Ch. 1 Temp. Offset
1
11h R/W 0000 0000
RESERVED
2
12h - 22h N/A RESERVED
Status Register 2 23h R 0000 0000
RESERVED
2
24h - 29h N/A RESERVED
Ch. 2 Temp. Value 30h R 0000 0000
Ch. 2 Temp. High Limit 31h R/W 0101 01010
Ch. 2 Temp. Low Limit 32h R/W 0000 0000
RESERVED
2
33h R 0000 0000
Ch. 2 Temp. Offset 34h R/W 0000 0000
RESERVED
2
35h - FEh N/A RESERVED
Die Revision Code
3
FFh R 1001 XXXX