LM75A
Digital temperature sensor and thermal watchdog
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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 and benefits
- 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
Applications
- System thermal management
- Personal computers
- Electronics equipment
- Industrial controllers
Show functional diagram
Parametrics of this product
| Type number | Package | Part type | Accuracy on-chip(±°C) | Assignable addresses | SMBus clock(kHz) | Operating voltage(VDC) | Remarks | Standby current(uA) | Operating Temperature(Cel) | I2C-bus controlled |
|---|---|---|---|---|---|---|---|---|---|---|
| LM75AD | SOT96-1 (SO8) | Supervisor, Temperature | 2@-25~100?3@-55~125 | 8 | 400 | 2.8~5.5 | Extended temperature range, temperature to digital converter, programmable threshold | 3 | -55~125 | 2.8~5.5 |
| LM75ADP | SOT505-1 (TSSOP) | Supervisor, Temperature | 2@-25~100?3@-55~125 | 8 | 400 | 2.8~5.5 | Extended temperature range, temperature to digital converter, programmable threshold | 3 | -55~125 | 2.8~5.5 |
Package
| Type number | Orderable part number | Ordering code (12NC) | Product status | Package | Packing | Marking |
|---|---|---|---|---|---|---|
| LM75AD | LM75AD,112 | 9352 697 75112 | Volume production | SOT96-1 (SO8) | Tube | Standard Marking |
| LM75AD | LM75AD,118 | 9352 697 75118 | Volume production | SOT96-1 (SO8) | Tape reel smd | Standard Marking |
| LM75AD/DG | LM75AD/DG,118 | 9352 886 96118 | Volume production | SOT96-1 (SO8) | Tape reel smd | Standard Marking |
| LM75ADP | LM75ADP,118 | 9352 697 76118 | Volume production | SOT505-1 (TSSOP) | Reel Pack, SMD, 13" | Standard Marking |
| LM75ADP/DG | LM75ADP/DG,118 | 9352 886 14118 | Volume production | SOT505-1 (TSSOP) | Reel Pack, SMD, 13" | Standard Marking |
| LM75ADP/S704 | LM75ADP/S704J | 9353 000 52118 | Volume production | SOT505-1 (TSSOP) | Reel Pack, SMD, 13" | Standard Marking |
Quality, reliability & chemical content
| Type number | Orderable part number | Chemical content | RoHS | Leadfree conversion date | RHF | IFR (FIT) | MTBF (hours) | MSL | MSL LF |
|---|---|---|---|---|---|---|---|---|---|
| LM75AD | LM75AD,112 | LM75AD |  | week 17, 2005 |  | 2.0 | 5.0E8 | 1 | 1 |
| LM75AD | LM75AD,118 | LM75AD | | week 17, 2005 | | 2.0 | 5.0E8 | 1 | 1 |
| LM75AD/DG | LM75AD/DG,118 | LM75AD/DG | | Always Pb-free | | 2.0 | 5.0E8 | 1 | 1 |
| LM75ADP | LM75ADP,118 | LM75ADP | | week 13, 2005 | | 2.0 | 5.0E8 | 1 | 1 |
| LM75ADP/DG | LM75ADP/DG,118 | LM75ADP/DG | | Always Pb-free | | 2.0 | 5.0E8 | 1 | 1 |
| LM75ADP/S704 | LM75ADP/S704J | LM75ADP/S704 | | Always Pb-free | | 2.0 | 5.0E8 | 1 | 1 |
Documentation for this product
| File name | Title | Type | Format | Date |
|---|---|---|---|---|
| LM75A | Digital temperature sensor and thermal watchdog | Data sheet | 2007-07-10 | |
| AN10441 | Level shifting techniques in I2C-bus design | Application note | 2007-06-20 | |
| AN10216 | I2C manual | Application note | 2003-03-27 | |
| AN10146 | I2C 2002-1A Evaluation Board | Application note | 2003-02-26 | |
| 75016543 | Create smarter, more efficient white goods; An industry-leading portfolio of cost-effective, power-saving solutions for major home appliances | Brochure | 2008-06-01 | |
| 75016531 | Evaluate the I2C-bus with a comprehensive kit; NXP I2C 2002-1A evaluation board kits OM6285 and OM6278 | Leaflet | 2008-07-01 | |
| 75017144 | I2C Selection Guide 2H 2011 | Leaflet | 2011-09-29 | |
| design_con_2003_tecforum_i2c_bus_overview | DesignCon 2003 TecForum I 2 C Bus Overview | Other type | 2003-01-27 | |
| 75015693 | I2C-bus temperature sensors; Small, accurate, low-cost sensors for advanced temperature regulation | Selection guide | 2006-11-01 | |
| UM10204 | I2C-bus specification and user manual | User manual | 2007-06-26 | |
| UM10206 | I2C Demonstration Board 2005-1 Quick Start Guide | User manual | 2006-06-13 |
Ordering & availability
| Type number | Ordering code (12NC) | Orderable part number | Region | Distributor | In stock | Order quantity | Inventory date | Buy online | Samples |
|---|---|---|---|---|---|---|---|---|---|
| LM75AD | 9352 697 75112 | LM75AD,112 | EU | AVNET EXPRESS EUROPE | 5,600 | 5/18/2013 |  | Not available | |
| EU | ARROW EUROPE | 4,920 | 5/8/2013 | | |||||
| NA | ARROW ELECTRONICS | 4,570 | 5/17/2013 | | |||||
| NA | AVNET EXPRESS AMERICAS | 3,970 | 5/18/2013 | | |||||
| NA | FUTURE ELECTRONICS | 3,151 | 5/17/2013 | | |||||
| EU | FUTURE ELECTRONICS UK | 3,151 | 5/17/2013 | | |||||
| ASIA | FUTURE ELECTRONICS- ASIA | 3,151 | 5/17/2013 | | |||||
| NA | DIGI-KEY CORPORATION | 1,685 | 5/18/2013 | | |||||
| NA | MOUSER ELECTRONICS | 1,467 | 5/18/2013 | | |||||
| LM75AD | 9352 697 75118 | LM75AD,118 | NA | FUTURE ELECTRONICS | 25,000 | 5/17/2013 | | ||
| EU | FUTURE ELECTRONICS UK | 25,000 | 5/17/2013 | | |||||
| ASIA | FUTURE ELECTRONICS- ASIA | 25,000 | 5/17/2013 | | |||||
| ASIA | WPI | 10,050 | 2500 | 05/18/2013 | | ||||
| NA | MOUSER ELECTRONICS | 2,616 | 5/18/2013 | | |||||
| NA | ARROW ELECTRONICS | 2,500 | 5/17/2013 | | |||||
| JAPAN | CHIP ONE STOP | 2,462 | 05/17/2013 | | |||||
| JAPAN | CHIP ONE STOP | 20 | 05/17/2013 | | |||||
| LM75AD/DG | 9352 886 96118 | LM75AD/DG,118 | |||||||
| LM75ADP/S704 | 9353 000 52118 | LM75ADP/S704J | |||||||
| LM75ADP | 9352 697 76118 | LM75ADP,118 | NA | AVNET EXPRESS AMERICAS | 21,045 | 5/18/2013 | | ||
| NA | DIGI-KEY CORPORATION | 17,224 | 5/18/2013 | | |||||
| NA | FUTURE ELECTRONICS | 5,000 | 5/17/2013 | | |||||
| EU | FUTURE ELECTRONICS UK | 5,000 | 5/17/2013 | | |||||
| ASIA | FUTURE ELECTRONICS- ASIA | 5,000 | 5/17/2013 | | |||||
| NA | ARROW ELECTRONICS | 1,526 | 5/17/2013 | | |||||
| NA | Newark element14 | 1,321 | 1 | 5/20/2013 | | ||||
| NA | MOUSER ELECTRONICS | 240 | 5/18/2013 | | |||||
| JAPAN | CHIP ONE STOP | 28 | 05/17/2013 | | |||||
| ASIA | Newark | 10 | 1 | 17/05/2013 | | ||||
| EU | Farnell Europe | 0 | 1 | 05/17/2013 | | ||||
| ASIA | Element 14 | 0 | 1 | 17/05/2013 | | ||||
| LM75ADP/DG | 9352 886 14118 | LM75ADP/DG,118 | NA | DIGI-KEY CORPORATION | 549 | 5/18/2013 | | ||
| JAPAN | CHIP ONE STOP | 40 | 05/17/2013 | |
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