Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsLM71CIMF/NOPB

Temperature

Sensor

Circuitry

Control

Logic

Temperature

Manufacturer's

ID Register

Three-Wire

Serial Interface

14-Bit

Delta-Sigma

A/D Converter

SI/O

2.65V to 5.5V

LM71

LM71, LM71-Q1

www.ti.com

SNIS125D –MARCH 2004–REVISED MARCH 2013

LM71/LM71-Q1 SPI/MICROWIRE 13-Bit Plus Sign Temperature Sensor

Check for Samples: LM71, LM71-Q1

FEATURES

• Temperature Accuracy

– −10°C to +65°C: ±1.5°C (max)

• LM71Q is AEC-Q100 Grade 0 Qualified and is

Manufactured on an Automotive Grade Flow

– −40°C to 150°C: +3/− 2°C (max)

• 5-Pin SOT-23 Package or 6-Pin No-Pull-Back

• Temperature Resolution: 31.25 m°C

WSON Package

DESCRIPTION

• Operates Over a Full −40°C to +150°C Range

The LM71 is a low-power, high-resolution digital

• SPI and MICROWIRE Bus Interface

temperature sensor with an SPI and MICROWIRE

compatible interface, available in the 5-pin SOT-23 or

APPLICATIONS

the 6-pin WSON (no pull back) package. The host

• System Thermal Management

can query the LM71 at any time to read temperature.

Its low operating current is useful in systems where

• Personal Computers

low power consumption is critical.

• Portable Electronic Devices

The LM71 has 13-bit plus sign temperature resolution

• Disk Drives

(0.03125°C per LSB) while operating over a

• Office Electronics

temperature range of −40°C to +150°C.

• Electronic Test Equipment

The LM71’s 2.65V to 5.5V supply voltage range, fast

• Vending Machines

conversion rate, low supply current, and simple SPI

• Automotive

interface make it ideal for a wide range of

applications. The LM71Q is available in the 5-lead

SOT-23 package only.

KEY SPECIFICATIONS

• Supply Voltage: 2.65V to 5.5V

• Supply Current

– Operating: 300 µA (typ)

– 550 µA (max)

Simplified Block Diagram

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (21 pages)

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LM71, LM71-Q1 www.ti.
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LM71, LM71-Q1 SNIS125D – MARCH 2004 – REVISED MARCH 2013 www.ti.com Connection Diagram CS 1 GND 2 SI/O 3 5 V+ SC 1 GND 2 SI/O 3 LM71 6 V+ 5 GND 4 CS LM71 4 SC Figure 1. 5-Pin SOT-23 See Package Number DBV Figure 2.
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LM71, LM71-Q1 www.ti.com SNIS125D – MARCH 2004 – REVISED MARCH 2013 Absolute Maximum Ratings (1) −0.3V to 6.0V Supply Voltage −0.3V to V+ + 0.
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LM71, LM71-Q1 SNIS125D – MARCH 2004 – REVISED MARCH 2013 www.ti.com Device Number Thermal Resistance (θJA) LM71CIMF/LM71QCIMF 250°C/W LM71CISD 57.6°C/W Temperature-to-Digital Converter Characteristics Unless otherwise noted, these specifications apply for V+ = 2.65V to 3.6V (1). Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = +25°C, unless otherwise noted. LM71CIMF LM71CISD Limits (3) Units (Limit) ±1.5 °C (max) TA = −40°C to +85°C ±2.
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LM71, LM71-Q1 www.ti.com SNIS125D – MARCH 2004 – REVISED MARCH 2013 SERIAL BUS DIGITAL SWITCHING CHARACTERISTICS Unless otherwise noted, these specifications apply for V+ = 2.65V to 3.6V (1); CL (load capacitance) on output lines = 100 pF unless otherwise specified. Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = +25°C, unless otherwise noted. Symbol Parameter Conditions Typical (2) Limits (3) Units (Limit) μs (min) (max) t1 SC (Clock) Period 0.
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LM71, LM71-Q1 SNIS125D – MARCH 2004 – REVISED MARCH 2013 www.ti.com SC 70% 30% t7 CS t6 SI 70% 30% Figure 6. Data Input Timing Diagram Figure 7. Temperature-to-Digital Transfer Function (Non-linear scale for clarity) Figure 8.
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LM71, LM71-Q1 www.ti.com SNIS125D – MARCH 2004 – REVISED MARCH 2013 Typical Performance Characteristics Static Supply Current vs. Temperature Temperature Error Figure 9. Figure 10.
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LM71, LM71-Q1 SNIS125D – MARCH 2004 – REVISED MARCH 2013 www.ti.com FUNCTIONAL DESCRIPTION The LM71 temperature sensor incorporates a temperature sensor and 13-bit plus sign ΔΣ ADC (Delta-Sigma Analog-to-Digital Converter). Compatibility of the LM71's three wire serial interface with SPI and MICROWIRE allows simple communications with common microcontrollers and processors. Shutdown mode can be used to optimize current drain for different applications.
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LM71, LM71-Q1 www.ti.com SNIS125D – MARCH 2004 – REVISED MARCH 2013 TEMPERATURE DATA FORMAT Temperature data is represented by a 14-bit, two's complement word with an LSB (Least Significant Bit) equal to 0.03125°C: Digital Output Temperature Binary Hex +150°C 0100 1011 0000 0011 4B03 +125°C 0011 1110 1000 0011 3E83 +25°C 0000 1100 1000 0011 0C83 +0.03125°C 0000 0000 0000 0111 0007 0°C 0000 0000 0000 0011 0003 −0.
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LM71, LM71-Q1 SNIS125D – MARCH 2004 – REVISED MARCH 2013 www.ti.com Temperature Register Table 2. (Read Only): D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 MSB Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit1 LSB 1 1 D0–D1: Logic 1 will be output on SI/0. D2–D15: Temperature Data. One LSB = 0.03125°C. Two's complement format. Manufacturer/Device ID Register Table 3.
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LM71, LM71-Q1 www.ti.com SNIS125D – MARCH 2004 – REVISED MARCH 2013 Application Hints To get the expected results when measuring temperature with an integrated circuit temperature sensor like the LM71, it is important to understand that the sensor measures its own die temperature. For the LM71, the best thermal path between the die and the outside world is through the LM71's pins. In the SOT-23 package, all the pins on the LM71 will have an equal effect on the die temperature.
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LM71, LM71-Q1 SNIS125D – MARCH 2004 – REVISED MARCH 2013 12 www.ti.
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LM71, LM71-Q1 www.ti.com SNIS125D – MARCH 2004 – REVISED MARCH 2013 REVISION HISTORY Changes from Revision C (March 2013) to Revision D • Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device. (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) LM71CIMF SOT-23 DBV 5 1000 178.0 8.4 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 3.2 3.2 1.4 4.0 8.0 Q3 LM71CIMF/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3 LM71CIMFX/NOPB SOT-23 DBV 5 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM71CIMF SOT-23 DBV 5 1000 210.0 185.0 35.0 LM71CIMF/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0 LM71CIMFX/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0 LM71CISD/NOPB WSON NGG 6 1000 210.0 185.0 35.0 LM71CISDX/NOPB WSON NGG 6 4500 367.0 367.0 35.0 LM71QCIMF/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.
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MECHANICAL DATA NGG0006A SDE06A (Rev A) www.ti.
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