se98pw NXP Semiconductors, se98pw Datasheet - Page 16

• Manufacturer Part Number: se98pw
• Description: Se98 So-dimm Smbus/i2c-bus Temperature Sensor
• Manufacturer: NXP Semiconductors

NXP Semiconductors
SE98_2
Product data sheet
8.5.1 Upper Boundary Alarm Trip register (16-bit read/write)
8.4 Temperature format
8.5 Temperature Trip Point registers
The 16-bit value used in the following Trip Point Set and Temperature Read-Back registers
is 2’s complement with the Least Significant Bit (LSB) equal to 0.0625 C. For example:
The resolution is 0.125 C. The unused LSB (bit 0) is set to ‘0’. Bit 11 will have a resolution
of 128 C.
The upper 3 bits of the temperature register indicate Trip Status based on the current
temperature, and are not affected by the status of the Event Output.
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 10.
Table 11.
Bit
Symbol
Reset
Access
Bit
15:13
12
11:2
1:0
Bit
Symbol
Reset
Access
•
•
•
A value of 019Ch will represent 25.75 C
A value of 07C0h will represent 124 C
A value of 1E64h will represent 25.75 C.
Symbol
RFU
SIGN
UBT
RFU
Upper Boundary Alarm Trip register bit allocation
Upper Boundary Alarm Trip register bit description
R/W
15
R
0
7
0
Rev. 02 — 7 January 2008
RFU
R/W
14
R
0
6
0
Description
reserved; always 0
Sign (MSB)
Upper Boundary Alarm Trip Temperature (LSB = 0.25 C)
reserved; always 0
R/W
13
R
0
5
0
UBT[5:0]
SO-DIMM SMBus/I
SIGN
R/W
R/W
12
0
4
0
R/W
R/W
11
0
3
0
2
C-bus temperature sensor
R/W
R/W
10
0
2
0
UBT[9:6]
© NXP B.V. 2008. All rights reserved.
R/W
9
0
R
1
0
RFU
SE98
R/W
16 of 32
8
0
R
0
0