SE95

General description

The SE95 is a temperature-to-digital converter using an on-chip band gap temperature sensor and Sigma Delta analog-to-digital conversion technique. The device is also a thermal detector providing an overtemperature detection output.

The SE95 contains a number of data registers accessed by a controller via the 2-wire serial I²C-bus interface:

• Configuration register (Conf) to store the device settings such as sampling rate, device operation mode, OS operation mode, OS polarity, and OS fault queue
• Temperature register (Temp) to store the digital Temp reading
• Set-point registers (Tos and Thyst) to store programmable overtemperature shutdown and hysteresis limits
• Identification register (ID) to store manufacturer numbers

The device includes an open-drain output (pin OS) which becomes active when the temperature exceeds the programmed limits. There are three selectable logic address pins (pins A2 to A0) 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 two's complement data giving a temperature resolution of 0.03125 Cel. 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 Cel 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 Cel and hysteresis of 75 Cel, 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/s.

Features

• Pin-for-pin replacement for industry standard LM75/LM75A
• Specification of a single part over supply voltage from 2.8 V to 5.5 V
• Small 8-pin package types: SO8 and TSSOP8 (MSOP8)
• I²C-bus interface to 400 kHz with up to 8 devices on the same bus
• Supply voltage from 2.8 V to 5.5 V
• Temperature range from -55 Cel to +125 Cel
• 13-bit ADC that offers a temperature resolution of 0.03125 Cel
• Temperature accuracy of +- 1 Cel from -25 Cel to +100 Cel
• Programmable temperature threshold and hysteresis set points
• Supply current of 7.0 uA in shutdown mode for power conservation
• Stand-alone operation as thermostat at power-up
• ESD protection exceeds 1000 V for Human Body Model (HBM) per JESD22-A114 and 150 V for Machine Model (MM) per JESD22-A115
• Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA

Products/packages

Quality/reliability/chemical content

Quality and reliability disclaimer

Pricing/ordering/availability

Applications

• System thermal management
• Personal computers
• Electronics equipment
• Industrial controllers

Related applications
Intelligent washing machine
Transceiver board
Power amplifier board
Main CPU board
LCD TV - MMS functionality

Block diagrams/pinning

Design support

Application Notes

AN10897; A guide to designing for ESD and EMC (2010-01-22)

AN10349; Digital temperature sensor accuracy explained (2006-08-09)

AN10216; I2C manual (2003-03-27)

AN10441; Level shifting techniques in I2C-bus design (2007-06-20)

Support Documents

75016543; An industry-leading portfolio of cost-effective, power-saving solutions for major home appliances (2008-06-01)

UM10206; I2C Demonstration Board 2005-1 Quick Start Guide (2006-06-13)

UM10204; I2C-bus specification and user manual (2007-06-26)

web; IBIS and HSPICE Model ()

75015693; Small, accurate, low-cost sensors for advanced temperature regulation (2006-11-01)

Parametrics/similar products

Similar products
SE95 links to the similar products page containing an overview of products that are similar in function or related to the type number(s) as listed on this page. The similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category.

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Disclaimers

• General product disclaimer
• Quality and reliability disclaimer