SE97_7 © NXP B.V. 2010. All rights reserved.
Product data sheet Rev. 07 — 29 January 2010 31 of 55
NXP Semiconductors
SE97
DDR memory module temp sensor with integrated SPD, 3.3 V
8.5.2 Lower Boundary Alarm Trip register (16-bit read/write)
The value is the lower 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.
8.5.3 Critical Alarm Trip register (16-bit read/write)
The value is the critical temperature. The data format is 2’s complement with
bit 2 = 0.25 °C. RFU bits will always report zero.
Table 17. Lower Boundary Alarm Trip register bit allocation
Bit 15 14 13 12 11 10 9 8
Symbol RFU SIGN LBT
Default 00000000
Access R R R R/W R/W R/W R/W R/W
Bit 7 6 5 4 3 2 1 0
Symbol LBT RFU
Default 00000000
Access R/W R/W R/W R/W R/W R/W R R
Table 18. Lower Boundary Alarm Trip register bit description
Bit Symbol Description
15:13 RFU reserved; always ‘0’
12 SIGN Sign (MSB)
11:2 LBT Lower Boundary Alarm Trip Temperature (LSB = 0.25 °C)
1:0 RFU reserved; always ‘0’
Table 19. Lower Boundary Alarm Trip register bit allocation
Bit 15 14 13 12 11 10 9 8
Symbol RFU SIGN CT
Default 00000000
Access R R R R/W R/W R/W R/W R/W
Bit 7 6 5 4 3 2 1 0
Symbol CT RFU
Default 00000000
Access R/W R/W R/W R/W R/W R/W R R
Table 20. Critical Alarm Trip register bit description
Bit Symbol Description
15:13 RFU reserved; always ‘0’
12 SIGN Sign (MSB)
11:2 CT Critical Alarm Trip Temperature (LSB = 0.25 °C)
1:0 RFU reserved; always ‘0’
