SE98A_4
?NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 04 25 November 2009
11 of 43
NXP Semiconductors
SE98A
DDR memory module temp sensor, 1.7 V to 3.6 V
7.5 Power-up default condition
After power-on, the SE98A is initialized to the following default condition:
" Starts monitoring local sensor
" EVENT
register is clearedEVENT
output is pulled HIGH by external pull-ups
" EVENT
hysteresis is defaulted to 0 癈
" Command pointer is defaulted to 00h
" Critical Temp, Alarm Temperature Upper and Lower Boundary Trip register are
defaulted to 0 癈
" Capability register is defaulted to 0037h for the B-grade and VHV capability
" Operational mode: comparator
" SMBus register is defaulted to 00h
7.6 Device initialization
SE98A temperature sensors have programmable registers, which, upon power-up, default
to zero. The open-drain EVENT
output is default to being disabled, comparator mode and
active LOW. The alarm trigger registers default to being unprotected. The configuration
registers, upper and lower alarm boundary registers and critical temperature window are
defaulted to zero and need to be programmed to the desired values. SMBus TIMEOUT
feature defaults to being enabled and can be programmed to disable. These registers are
required to be initialized before the device can properly function. Except for the SPD,
which does not have any programmable registers, and does not need to be initialized.
Table 4
shows the default values and the example value to be programmed to these
registers.
Table 4.
Registers to be initialized
Register
Default value
Example value
Description
01h
0000h
0209h
Configuration register
" hysteresis = 1.5 ?/SPAN>C
" EVENT
output = Interrupt mode
" EVENT
output is enabled
02h
0000h
0550h
Upper Boundary Alarm Trip register = 85 癈
03h
0000h
1F40h
Lower Boundary Alarm Trip register = 20 癈
04h
0000h
05F0h
Critical Alarm Trip register = 95 癈
22h
0000h
0000h
SMBus register = no change
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