SE97B_1
?NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 01 27 January 2010
22 of 53
NXP Semiconductors
SE97B
DDR memory module temp sensor with integrated SPD
8. Register descriptions
8.1 Register overview
This section describes all the registers used in the SE97B. The registers are used for
latching the temperature reading, storing the low and high temperature limits, configuring,
the hysteresis threshold of the ADC, as well as reporting status. The device uses the
pointer register to access these registers. Read registers, as the name implies, are used
for read only, and the write registers are for write only. Any attempt to read from a
write-only register will result in reading 0s. Writing to a read-only register will have no
effect on the read even though the write command is acknowledged. The Pointer register
is an 8-bit register. All other registers are 16-bit.
A write to reserved registers my cause unexpected results which may result in requiring a
reset by removing and re-applying its power.
Table 9.
Register summary
Address
(hex)
Default
state
(hex)
Register name
Short
name
JEDEC name
n/a
n/a
Pointer register
00h
F7h
Capability register
CAP
Capabilities
01h
0000h
Configuration register
CONFIG
Configuration
02h
0000h
Upper Boundary Alarm Trip register UPPER
High Limit
03h
0000h
Lower Boundary Alarm Trip register LOWER
Low Limit
04h
0000h
Critical Alarm Trip register
CRITICAL
TCRIT Limit
05h
n/a
Temperature register
TEMP
Ambient
Temperature
06h
1131h
Manufacturer ID register
MANID
Manufacturer ID
07h
A203h
Device ID/Revision register
DEVICEID Device/Revision
08h to 21h 0000h
reserved registers
22h
21h
SMBus register
SMBUS
23h to FFh 0000h
reserved
Vendor-defined
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