SE97BTP datasheet(22/53 Pages) NXP

22 / 53 page

SE97B_1

Product data sheet

Rev. 01 — 27 January 2010

22 of 53

NXP Semiconductors

SE97B

DDR memory module temp sensor with integrated SPD

8.1 Register overview

This section describes all the registers used in the SE97B. The registers are used for

latching the temperature reading, storing the low and high temperature limits, configuring,

the hysteresis threshold of the ADC, as well as reporting status. The device uses the

pointer register to access these registers. Read registers, as the name implies, are used

for read only, and the write registers are for write only. Any attempt to read from a

write-only register will result in reading ‘0’s. Writing to a read-only register will have no

effect on the read even though the write command is acknowledged. The Pointer register

is an 8-bit register. All other registers are 16-bit.

A write to reserved registers my cause unexpected results which may result in requiring a

reset by removing and re-applying its power.

Table 9.

Address

(hex)

Default

state

(hex)

Short

name

JEDEC name

n/a

Pointer register

00h

F7h

Capability register

CAP

Capabilities

01h

0000h

Configuration register

CONFIG

Configuration

02h

0000h

Upper Boundary Alarm Trip register

UPPER

High Limit

03h

0000h

Lower Boundary Alarm Trip register

LOWER

Low Limit

04h

0000h

Critical Alarm Trip register

CRITICAL

TCRIT Limit

05h

n/a

Temperature register

TEMP

Ambient

Temperature

06h

1131h

Manufacturer ID register

MANID

Manufacturer ID

07h

A203h

Device ID/Revision register

DEVICEID

Device/Revision

08h to 21h

0000h

reserved registers

22h

21h

SMBus register

SMBUS

23h to FFh

0000h

reserved

Vendor-defined

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