SE95_7

© NXP B.V. 2009. All rights reserved.

Product data sheet

Rev. 07 — 2 September 2009

8 of 27

NXP Semiconductors

SE95

Ultra high accuracy digital temperature sensor and thermal watchdog

used. Consider using the SE98 since it supports SMBus ARA as well as time-out features

and provides

±1 °C accuracy.

8.2 Register list

The SE95 contains 7 data registers. The registers can be 1 byte or 2 bytes wide, and are

defined in Table 5. The registers are accessed by the value in the content of the pointer

and reserved for manufacturer use. Note that when reading a two-byte register, the host

for the device to completely return both data bytes. Otherwise the device may hold the

SDA line in LOW state, resulting in a bus hang condition.

8.3 Register pointer

The register pointer or pointer byte is an 8-bit data byte that is equivalent to the register

accessed for a write or read operation. Its values are listed as pointer values in Table 5.

Section 8.7.

The command statements for writing data to a register must always include the pointer

byte; while the command statements for reading data from a register may or may not

include it. To read a register that is different from the one that has been recently read, the

pointer byte must be included. However, to re-read a register that has been recently read,

the pointer byte may not have to be included in the reading.

Table 4.

Address table

MSB

LSB

1001

A2

A1

A0

Table 5.

Register table

Register

name

Pointer

value

R/W

POR

state

Description

Conf

01h

R/W

00h

configuration register: contains a single 8-bit data byte;

to set an operating condition

Temp

00h

read

only

N/A

temperature register: contains two 8-bit data bytes; to

store the measured Temp

Tos

03h

R/W

5000h

overtemperature shutdown threshold register: contains

two 8-bit data bytes; to store the overtemperature

Thyst

02h

R/W

4B00h

hysteresis register: contains two 8-bit data bytes; to

store the hysteresis limit; bit 7 to bit 0 are also used in

OTP (One Time Programmable) test mode to supply

ID

05h

read

only

A1h

identification register: contains a single 8-bit data byte

for the manufacturer ID code

Reserved

04h

N/A

N/A

reserved

Reserved

06h

N/A

N/A

reserved