se97b NXP Semiconductors, se97b Datasheet - Page 29

• Manufacturer Part Number: se97b
• Description: Ddr Memory Module Temp Sensor With Integrated Spd
• Manufacturer: NXP Semiconductors

NXP Semiconductors
SE97B_1
Product data sheet
8.5.1 UPPER — Upper Boundary Alarm Trip register (02h, 16-bit read/write)
8.5 Temperature Trip Point registers
While writing to the 16-bit Upper, Lower, or Critical Boundary Alarm Trip registers, please
ensure that both bytes get written before doing a new START or STOP to ensure that a
valid temperature value gets written into the registers.
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 16.
Table 17.
Bit
Symbol
Default
Access
Bit
15:13
12
11:2
1:0
Bit
Symbol
Default
Access
Symbol
RFU
SIGN
-
RFU
UPPER - Upper Boundary Alarm Trip register bit allocation
Upper Boundary Alarm Trip register bit description
RFU
8 °C
R/W
15
R
0
7
0
Rev. 01 — 27 January 2010
RFU
4 °C
R/W
14
R
0
6
0
Description
Sign (MSB)
reserved; always ‘0’
reserved; always ‘0’
Upper Boundary Alarm Trip Temperature (LSB = 0.25 °C)
DDR memory module temp sensor with integrated SPD
RFU
2 °C
R/W
13
R
0
5
0
SIGN
R/W
1 °C
R/W
12
0
4
0
128 °C
0.5 °C
R/W
R/W
11
0
3
0
0.25 °C
64 °C
R/W
R/W
10
0
2
0
© NXP B.V. 2010. All rights reserved.
32 °C
R/W
RFU
9
0
R
1
0
SE97B
16 °C
R/W
RFU
29 of 53
8
0
R
0
0