se98pw NXP Semiconductors, se98pw Datasheet - Page 13

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

NXP Semiconductors
Table 7.
SE98_2
Product data sheet
Bit
Symbol
Default
Access
Bit
Symbol
Default
Access
Configuration register (address 01h) bit allocation
CTLB
8.3 Configuration register (01h, 16-bit read/write)
R/W
15
R
0
7
0
Table 8.
Bit
15:11
10:9
8
AWLB
R/W
14
R
0
6
0
Symbol
RFU
HEN
SHMD
Configuration register (address 01h) bit description
CEVNT
RFU
R/W
13
R
0
5
0
Description
reserved for future use; must be ‘0’.
Hysteresis Enable
When enabled, hysteresis is applied to temperature movement around
trigger points. For example, consider the behavior of the ‘Above Alarm
Window’ bit (bit 14 of the Temperature register) when the hysteresis is set
to 3 C. As the temperature rises, bit 14 will be set to 1 (temperature is
above the alarm window) when the Temperature register contains a value
that is greater than the value in the Alarm Temperature Upper Boundary
register. If the temperature decreases, bit 14 will remain set until the
measured temperature is less than or equal to the value in the Alarm
Temperature Upper Boundary register minus 3 C. (Refer to
Table
Similarly, the ‘Below Alarm Window’ bit (bit 13 of the Temperature register)
will be set to 0 (temperature is equal to or above the Alarm Window Lower
Boundary Trip register) when the value in the Temperature register is
equal to or greater than the value in the Alarm Temperature Lower
Boundary register. As the temperature decreases, bit 13 will be set to 1
when the value in the Temperature register is equal to or less than the
value in the Alarm Temperature Lower Boundary register minus 3 C. Note
that hysteresis is also applied to EVENT pin functionality.
When either of the lock bits is set, these bits cannot be altered.
Shutdown Mode.
When shut down, the thermal sensor diode and Analog-to-Digital
Converter (ADC) are disabled to save power, no events will be generated.
When either of the lock bits is set, this bit cannot be set until unlocked.
However, it can be cleared at any time.
Rev. 02 — 7 January 2008
00 — Disable hysteresis (default)
01 — Enable hysteresis at 1.5 C
10 — Enable hysteresis at 3 C
11 — Enable hysteresis at 6 C
0 — Enabled Temperature Sensor (default)
1 — Disabled Temperature Sensor
9).
ESTAT
R/W
12
R
0
4
0
SO-DIMM SMBus/I
EOCTL
R/W
11
R
0
3
0
R/W
CVO
R/W
10
0
2
0
HEN[1:0]
2
C-bus temperature sensor
R/W
R/W
EP
9
0
1
0
© NXP B.V. 2008. All rights reserved.
Figure 5
SE98
SHMD
EMD
R/W
R/W
8
0
0
0
13 of 32
and