SE97BTP datasheet(29/53 Pages) NXP

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SE97B_1

Product data sheet

Rev. 01 — 27 January 2010

29 of 53

NXP Semiconductors

SE97B

DDR memory module temp sensor with integrated SPD

8.5 Temperature Trip Point registers

While writing to the 16-bit Upper, Lower, or Critical Boundary Alarm Trip registers, please

ensure that both bytes get written before doing a new START or STOP to ensure that a

valid temperature value gets written into the registers.

8.5.1 UPPER — Upper Boundary Alarm Trip register (02h, 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 16.

UPPER - Upper Boundary Alarm Trip register bit allocation

Bit

Symbol

RFU

SIGN

128

°C64 °C32 °C16 °C

Default

Access

R/W

Bit

Symbol

°C4 °C2 °C1 °C0.5 °C0.25 °CRFU

RFU

Default

Access

R/W

Table 17.

Upper Boundary Alarm Trip register bit description

Bit

Symbol

Description

15:13

RFU

reserved; always ‘0’

SIGN

Sign (MSB)

11:2

Upper Boundary Alarm Trip Temperature (LSB = 0.25

°C)

1:0

RFU

reserved; always ‘0’

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