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SE95 Datasheet(PDF) 2 Page - NXP Semiconductors

Part No. SE95
Description  Ultra high accuracy digital temperature sensor and thermal WatchdogE
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com

SE95 Datasheet(HTML) 2 Page - NXP Semiconductors

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Philips Semiconductors
Product data sheet
Ultra high accuracy digital temperature sensor and
thermal Watchdog
2004 Dec 21
The SE95 is a temperature-to-digital converter using an on-chip
band-gap temperature sensor and Sigma-delta A-to-D conversion
technique. The device is also a thermal detector providing an
over-temp detection output. The SE95 contains a number of data
registers: Configuration register (Conf) to store the device settings
such as sampling rate, device operation mode, OS operation mode,
OS polarity, and OS fault queue as described in the functional
description section; temperature register (Temp) to store the digital
temp reading, and set-point registers (Tos & Thyst) to store
programmable overtemp shutdown and hysteresis limits, and also
an ID register to store manufacturer numbers. These registers are
accessed by a controller via the 2-wire serial I2C-bus interface. The
device includes an open-drain output (OS) which becomes active
when the temperature exceeds the programmed limits. There are
three selectable logic address pins so that eight devices can be
connected on the same bus without address conflict.
The SE95 can be configured for different operation conditions. It can
be set in normal mode to periodically monitor the ambient
temperature, or in shutdown mode to minimize power consumption.
The OS output operates in either of two selectable modes: OS
comparator mode and OS interrupt mode. Its active state can be
selected as either HIGH or LOW. The fault queue that defines the
number of consecutive faults in order to activate the OS output is
programmable as well as the set-point limits.
The temperature register always stores a 13-bit 2’s complement
data giving a temperature resolution of 0.03125
°C. This high
temperature resolution is particularly useful in applications of
measuring precisely the thermal drift or runaway. For normal
operation and compatibility with the LM75A, only the 11 MSBs are
read, with a resolution of 0.125
°C to provide the accuracies
specified. To be compatible with the LM75, read only the 9 MSBs.
The device is powered-up in normal operation mode with the OS in
comparator mode, temperature threshold of 80
°C and hysteresis of
°C, so that it can be used as a stand-alone thermostat with those
pre-defined temperature set points. The conversion rate is
programmable, with a default of 10 conversions/sec.
Pin-for-pin replacement for industry standard LM75/LM75A and
offers improved temperature resolution
Specification of a single part over power supply range from 2.8 V
to 5.5 V.
Small 8-pin package types: SO8 and TSSOP8 (MSOP8)
I2C-bus interface to 400kHz with up to 8 devices on the same bus
Power supply range from 2.8 V to 5.5 V
Temperatures range from –55 °C to +125 °C
13-bit ADC that offers a temperature resolution of 0.03125 °C
Temperature accuracy of ±1 °C from –25 °C to +100 °C
Programmable temperature threshold and hysteresis set points
Supply current of 7.0 µA in shut-down mode for power
Stand-alone operation as thermostat at power-up
ESD protection exceeds 1000 V HBM per JESD22-A114,
150 V MM per JESD22-A115
Latch-up testing is done to JEDEC Standard JESD78 which
exceeds 100 mA
System thermal management
Personal computers
Electronics equipment
Industrial controllers
Type n mber
Topside mark
Type number
Topside mark
plastic small outline package; 8 leads; body width 3.9 mm
°C to +125 °C
plastic thin shrink small outline package; 8 leads;
body width 3 mm
°C to +125 °C
™ is a trademark of National Semiconductor Corporation.

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