SE97B_1
?NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 01 27 January 2010
24 of 53
NXP Semiconductors
SE97B
DDR memory module temp sensor with integrated SPD
8.3 CONFIG Configuration register (01h, 16-bit read/write)
Table 12. CONFIG - Configuration register (address 01h) bit allocation
Bit
15
14
13
12
11
10
9
8
Symbol
RFU
HEN
SHMD
Default
0
0
0
0
0
0
0
0
Access
R
R
R
R
R
R/W
R/W
R/W
Bit
7
6
5
4
3
2
1
0
Symbol
CTLB
AWLB
CEVNT
ESTAT
EOCTL
CVO
EP
EMD
Default
0
0
0
0
0
0
0
0
Access
R/W
R/W
W
R
R/W
R/W
R/W
R/W
Table 13. Configuration register (address 01h) bit description
Bit
Symbol
Description
15:11
RFU
reserved for future use; must be 0.
10:9
HEN
Hysteresis Enable.
00 disable hysteresis (default)
01 enable hysteresis at 1.5 癈
10 enable hysteresis at 3 癈
11 enable hysteresis at 6 癈
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 癈. 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 癈. (Refer to Figure 4
and Table 14
).
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 癈. Note that
hysteresis is also applied to EVENT
pin functionality.
When either of the Critical Trip or Alarm Window lock bits is set, these bits
cannot be altered until unlocked.
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