SE98A Datasheet, PDF (19/43 Pages) NXP Semiconductors – DDR memory module temp sensor, 1.7 V to 3.6 V

NXP Semiconductors
SE98A
DDR memory module temp sensor, 1.7 V to 3.6 V
Table 9. Configuration register (address 01h) bit description …continued
Bit Symbol Description
7
CTLB Critical Trip Lock bit.
0 — Critical Alarm Trip register is not locked and can be altered (default).
1 — Critical Alarm Trip register settings cannot be altered.
This bit is initially cleared. When set, this bit will return a 1, and remains locked
until cleared by internal Power-on reset. This bit can be written with a single
write and do not require double writes.
6
AWLB Alarm Window Lock bit.
0 — Upper and Lower Alarm Trip registers are not locked and can be
altered (default).
1 — Upper and Lower Alarm Trip registers setting cannot be altered.
This bit is initially cleared. When set, this bit will return a 1 and remains locked
until cleared by internal power-on reset. This bit can be written with a single
write and does not require double writes.
5
CEVNT Clear EVENT (write only).
0 — No effect (default).
1 — Clears active EVENT in Interrupt mode. Writing to this register has no
effect in Comparator mode.
When read, this register always returns zero.
4
ESTAT EVENT Status (read only).
0 — EVENT output condition is not being asserted by this device (default).
1 — EVENT output pin is being asserted by this device due to Alarm
Window or Critical Trip condition.
The actual event causing the EVENT can be determined from the Read
Temperature register. Interrupt Events can be cleared by writing to the
‘Clear EVENT’ bit (CEVNT). Writing to this bit will have no effect.
3
EOCTL EVENT Output Control.
0 — EVENT output disabled (default).
1 — EVENT output enabled.
When either of the Critical Trip or Alarm Window lock bits is set, this bit cannot
be altered until unlocked.
2
CVO
Critical Event Only.
0 — EVENT output on Alarm or Critical temperature event (default)
1 — EVENT only if temperature is above the value in the critical
temperature register
When the Critical Trip or Alarm Window lock bit is set, this bit cannot be
altered until unlocked.
• Advisory note:
– JEDEC specification requires only the Alarm Window lock bit to be
set.
– Work-around: Clear both Critical Trip and Alarm Window lock bits.
– Future 1.7 V to 3.6 V SE98B will require only the Alarm Window lock
bit to be set.
SE98A_2
Product data sheet
Rev. 02 — 6 August 2009
© NXP B.V. 2009. All rights reserved.
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