SE98A Datasheet, PDF (22/43 Pages) NXP Semiconductors – DDR memory module temp sensor, 1.7 V to 3.6 V

NXP Semiconductors
SE98A
DDR memory module temp sensor, 1.7 V to 3.6 V
8.5 Temperature Trip Point registers
8.5.1 Upper Boundary Alarm Trip register (16-bit read/write)
The value is the upper threshold temperature value for Alarm mode. The data format is
2’s complement with bit 2 = 0.25 °C. ‘RFU’ bits will always report zero. Interrupts will
respond to the presently programmed boundary values. If boundary values are being
altered in-system, it is advised to turn off interrupts until a known state can be obtained to
avoid superfluous interrupt activity.
Table 12.
Bit
Symbol
Reset
Access
Bit
Symbol
Reset
Access
Upper Boundary Alarm Trip register bit allocation
15
14
13
12
11
RFU
SIGN
0
0
0
0
0
R
R
R
R/W
R/W
7
6
5
4
3
UBT[5:0]
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
10
9
8
UBT[9:6]
0
0
0
R/W
R/W
R/W
2
1
0
RFU
0
0
0
R/W
R
R
Table 13. Upper Boundary Alarm Trip register bit description
Bit
Symbol
Description
15:13 RFU
reserved; always 0
12
SIGN
Sign (MSB)
11:2
UBT
Upper Boundary Alarm Trip Temperature (LSB = 0.25 °C)
1:0
RFU
reserved; always 0
SE98A_2
Product data sheet
Rev. 02 — 6 August 2009
© NXP B.V. 2009. All rights reserved.
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