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LM75A
Datasheet
(Product Specification)
10-Jul-07, 24 pages, 137 kB
General description
The LM75A 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 overtemperature detection output. The LM75A contains a number of data registers: Configuration register (Conf) to store the device settings such as device operation mode, OS operation mode, OS polarity and OS fault queue as described in Section 7 "Functional description"; temperature register (Temp) to store the digital temp reading, and set-point registers (Tos and Thyst) to store programmable overtemperature shutdown and hysteresis limits, that can be communicated by a controller via the 2-wire serial I2C-bus interface. The device also 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 LM75A 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 or 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 an 11-bit 2's complement data giving a temperature resolution of 0.125 Cel. This high temperature resolution is particularly useful in applications of measuring precisely the thermal drift or runaway.
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.
Features
- Pin-for-pin replacement for industry standard LM75 and offers improved temperature resolution of 0.125 Cel and 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
- I2C-bus interface with up to 8 devices on the same bus
- Power supply range from 2.8 V to 5.5 V
- Temperatures range from -55 Cel to +125 Cel
- 11-bit ADC that offers a temperature resolution of 0.125 Cel
- Temperature accuracy of:
- +-2 Cel from -25 Cel to +100 Cel
- +-3 Cel from -55 Cel to +125 Cel
- Programmable temperature threshold and hysteresis set points
- Supply current of 3.5 uA in shutdown mode for power conservation
- Stand-alone operation as thermostat at power-up
- ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per JESD22-A115 and 1000 V CDM per JESD22-C101
- Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
Products/packages
| Type number | Orderable part number | Ordering code (12NC) | Product status | Package | Packing | Marking | ECCN |
|---|---|---|---|---|---|---|---|
| LM75AD | LM75AD,112 | 9352 697 75112 | Volume production | SOT96 | Tube | Standard Marking | |
| LM75AD | LM75AD,118 | 9352 697 75118 | Volume production | SOT96 | Reel Pack, SMD, 13" | Standard Marking | |
| LM75ADP | LM75ADP,118 | 9352 697 76118 | Volume production | SOT505 | Reel Pack, SMD, 13" | Standard Marking |
Quality/reliability/chemical content
| Type number | Orderable part number | Chemical content | RoHS | Leadfree Conversion date | RHF | IRF (FIT) | MTBF (hours) | MSL |
|---|---|---|---|---|---|---|---|---|
| LM75AD | LM75AD,112 | Not available |
| week 17, 2005 | ||||
| LM75AD | LM75AD,118 | Not available |
| week 17, 2005 | ||||
| LM75ADP | LM75ADP,118 | LM75ADP |
| week 13, 2005 |
Pricing/ordering/availability
| Type number | Ordering code(12NC) | Orderable part number | Indicative price/unit($) | Region | Distributor | In stock | Order quantity | Inventory date | Buy online | Samples |
|---|---|---|---|---|---|---|---|---|---|---|
| LM75AD | 9352 697 75112 | LM75AD,112 | 0.4600 | NA | ARROW ELECTRONICS | 4,336 | 11/6/2009 | Buy online | not available | |
| NA | DIGI-KEY CORPORATION | 1,724 | 11/6/2009 | Buy online | ||||||
| NA | MOUSER ELECTRONICS | 1,018 | 11/6/2009 | Buy online | ||||||
| NA | FUTURE ELECTRONICS | 2,000 | 11/7/2009 | Buy online | ||||||
| NA | AVNET ELECTRONICS MARKETING | 2,642 | 11/6/2009 | Buy online | ||||||
| LM75AD | 9352 697 75118 | LM75AD,118 | 0.4600 | ASIA | SAC - Taiwan | yes | 2500 | 11/07/2009 | Buy online | not available |
| NA | MOUSER ELECTRONICS | 2,101 | 11/6/2009 | Buy online | ||||||
| NA | AVNET ELECTRONICS MARKETING | 35,000 | 11/6/2009 | Buy online | ||||||
| LM75ADP | 9352 697 76118 | LM75ADP,118 | 0.5900 | ASIA | SACL - Hong Kong/China | yes | 2500 | 11/07/2009 | Buy online | Order samples |
| ASIA | WPI | 2,500 | 2500 | 11/06/2009 | Buy online |
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
Design support
Application Notes
AN10146_02;
I2C 2002-1A Evaluation Board (2003-02-26)AN10216_1;
I2C manual (2003-03-27)AN10216_1;
I2C manual (2003-03-27)AN10216_1;
I2C manual (2003-03-27)
Support Documents
75016543;
An industry-leading portfolio of cost-effective, power-saving solutions for major home appliances (2008-06-01)75015139;
I2C temperature sensors selection guide (2005-06-01)UM10204_3;
I2C-bus specification and user manual (2007-06-26)Parametrics/similar products
| Type number | Package | REMARKS | Standby current(uA) | Operating temp.(Cel) | I²C-bus controlled | Part type | Accuracy on-chip( ±°C) | Assignable Addresses | Internal Temperature Monitor | Over Temperature Alert | Remote Temperature Monitor | SMBus Clock (max)(kHz) | Under Temperature Alert | Operating voltage(VDC) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| LM75AD | SOT96
| Extended temperature range, temperature to digital converter, programmable threshold | .0035 | -55~125 | yes | Supervisor, Temperature | 2@-25~100 2@+60~100 | 8 | yes | yes | no | 400.0 | no | 2.8~5.5 |
| LM75ADP | SOT505
| .0035 | -55~125 | 2@-25~100 2@+60~100 | 8 | yes | no | 400.0 | no | 2.8~5.5 |
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