SE98PW datasheet(21/39 Pages) NXP

21 / 39 page

SE98_4

Product data sheet

Rev. 04 — 2 February 2009

21 of 39

NXP Semiconductors

SE98

DDR memory module temp sensor, 3.3 V

8.5 Temperature Trip Point registers

8.5.1 Upper Boundary Alarm Trip register (16-bit read/write)

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 12.

Upper Boundary Alarm Trip register bit allocation

Bit

Symbol

RFU

SIGN

UBT[9:6]

Reset

00000000

Access

R/W

Bit

Symbol

UBT[5:0]

RFU

Reset

00000000

Access

R/W

Table 13.

Upper Boundary Alarm Trip register bit description

Bit

Symbol

Description

15:13

RFU

reserved; always 0

SIGN

Sign (MSB)

11:2

UBT

Upper Boundary Alarm Trip Temperature (LSB = 0.25

°C)

1:0

RFU

reserved; always 0

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