Datasheet

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TC72

Features

• Temperature-to-Digital Converter

• SPI Compatible Interface

• 10-Bit Resolution (0.25°C/Bit)

• ±2°C (maximum) Accuracy from -40°C to +85°C

• ±3°C (maximum) Accuracy from -55°C to +125°C

• 2.65V to 5.5V Operating Range

• Low Power Consumption:

- 250 µA (typical) Continuous Temperature

Conversion Mode

- 1 µA (maximum) Shutdown Mode

• Power Saving One-Shot Temperature

Measurement

• Industry Standard 8-Pin MSOP Package

• Space Saving 8-Pin DFN (3x3 mm) Package

Typical Applications

• Personal Computers and Servers

• Hard Disk Drives and Other PC Peripherals

• Entertainment Systems

• Office Equipment

• Datacom Equipment

• Mobile Phones

• General Purpose Temperature Monitoring

Package Types

General Description

TC72 is a digital temperature sensor capable of

reading temperatures from -55°C to +125°C. This

sensor features a serial interface that allows

communication with a host controller or other

peripherals. The TC72 interface is compatible with the

SPI protocol, and does not require any additional

external components. However, it is recommended that

a decoupling capacitor of 0.01 µF to 0.1 µF be provided

between the V

and GND pins.

TC72 can be used either in a Continuous Temperature

Conversion mode or a One-Shot Conversion mode.

The Continuous Conversion mode measures the

temperature approximately every 150 ms and stores

the data in the temperature registers. In contrast, the

One-Shot mode performs a single temperature

measurement and returns to the power saving

shutdown mode.

TC72 features high temperature accuracy, ease-of-use

and is the ideal solution for implementing thermal

management in a variety of systems. The device is

available in both 8-pin MSOP and 8-pin DFN space-

saving packages. TC72 also features a Shutdown

mode for low power operation.

Block Diagram

SCK

GND

SDI

SDO

TC72

3x3 DFN*

SCK

GND

SDO

SDI

* Includes Exposed Thermal Pad (EP); see Table 3-1.

TC72

MSOP

TC72

Diode

Temperature

Sensor

SCK

Serial

Port

Interface

10-Bit

Sigma Delta

A/D Converter

Temperature

Internal

Control

Manufacturer

ID Register

GND

SDO

SDI

Digital Temperature Sensor with SPI

Interface

Summary of content (28 pages)

PAGE 1
TC72 Digital Temperature Sensor with SPI Interface Features General Description • • • • • • • TC72 is a digital temperature sensor capable of reading temperatures from -55°C to +125°C. This sensor features a serial interface that allows communication with a host controller or other peripherals. The TC72 interface is compatible with the SPI protocol, and does not require any additional external components. However, it is recommended that a decoupling capacitor of 0.01 µF to 0.
PAGE 3
TC72 1.0 ELECTRICAL CHARACTERISTICS 1.1 Maximum Ratings† † Notice: Stresses above those listed under "Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operation listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability. VDD..................................................................
PAGE 4
TC72 DC CHARACTERISTICS (CONTINUED) Electrical Specifications: Unless otherwise noted, all parameters apply at VDD = 2.65V to 5.5V, TA = -55°C to +125°C. Parameters Sym Min Typ Max Units Conditions Serial Port AC Timing (Note 2, 3) Clock Frequency fCLK DC — 7.
PAGE 5
TC72 SPI READ DATA TRANSFER (CP = 0, data shifted on rising edge of SCK, data clocked on falling edge of SCK, A7 = 0) tCWH CE tCCH 1/fCLK tCC SCK SDI tDC tCDH A7 MSb tF tR tCH A0 tCL LSb tCDD SDO HIGH Z tCDZ HIGH Z MSb D7 D0 LSb SPI WRITE DATA TRANSFER (CP = 0, data shifted on rising edge of SCK, data clocked on falling edge of SCK, A7 = 1) tCWH CE 1/fCLK tCC tCCH SCK tF SDI A7 = 1 MSb Note: FIGURE 1-1: tCH tR A0 LSb tDC tCDH D7 MSb tCL D0 LSb The timing diagram is dra
PAGE 7
TC72 2.0 TYPICAL PERFORMANCE CURVES Note: The graphs and tables provided following this note are a statistical summary based on a limited number of samples and are provided for informational purposes only. The performance characteristics listed herein are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified operating range (e.g., outside specified power supply range) and therefore outside the warranted range. 3.5 3 2.5 2 1.5 1 0.5 0 -0.5 -1 -1.5 -2 -2.
PAGE 8
TC72 TC72-X.XMXX Sample Size = 166 TA = +65°C 50 40 30 20 10 Temperature Error (°C) TC72-X.XMXX Sample Size = 166 TA = -40°C 40 30 20 10 0 1.5 2 -2 -1.5 1.50 1.25 0.75 0.50 0.25 0.00 1.00 1.5 2 Temperature Error (°C) FIGURE 2-9: Histogram of Temperature Accuracy at +25 Degrees C. 25 20 15 10 5 3 2.5 0 2 1.50 1.25 1.00 0.75 0.50 0.25 0.00 -0.25 -0.50 -0.75 0 30 -2 10 -1.00 1 TC72-X.XMXX Sample Size = 166 TA = +125°C 35 -3 20 -1.25 0.5 40 -2.
PAGE 9
TC72 3.0 PIN DESCRIPTION Pin functionalities are described in Table 3-1. TABLE 3-1: PIN FUNCTION TABLE TC72 Symbol 3x3 DFN MSOP 1 1 NC 2 3 SCK 3 2 CE 4 4 GND 3.
PAGE 11
TC72 4.0 FUNCTIONAL DESCRIPTION The Continuous Conversion mode measures the temperature approximately every 150 ms and stores the data in the temperature registers. TC72 has an internal clock generator that controls the automatic temperature conversion sequence. The automatic temperature sampling operation is repeated indefinitely until TC72 is placed in Shutdown mode by a write operation to the Control register. TC72 will remain in Shutdown mode until the shutdown bit in the Control register is reset.
PAGE 12
TC72 4.1 Temperature Data Format 4.3 Temperature data is represented by a 10-bit two’s complement word with a resolution of 0.25°C per bit. The temperature data is stored in the Temperature registers in a two’s complement format. The ADC converter is scaled from -128°C to +127°C, but the operating range of TC72 is specified from -55°C to +125°C. EXAMPLE 4-1: Temperature = +41.5°C MSB Temperature Register = 00101001b = 25 + 23 + 20 = 32 + 8 + 1 = 41 = 10000000b = 2-1 = 0.
PAGE 13
TC72 TABLE 4-3: OPERATIONAL MODES Mode CE SCK (Note 1) SDI SDO Disable L Input Disabled Input Disabled High Z Data Bit Latch High Z X Next data bit shift, Note 2 Write (A7 = 1) H CP=1, Data Shifted on Falling Edge, Data Clocked on Rising Edge CP=0, Data Shifted on Rising Edge, Data Clocked on Falling Edge Read (A7 = 0) H CP=1, Data Shifted on Falling Edge, Data Clocked on Rising Edge CP=0, Data Shifted on Rising Edge, Data Clocked on Falling Edge Note 1: 2: 4.
PAGE 14
TC72 Single Byte Write Operation (CP=0, data shifted on rising edge of SCK, data clocked on falling edge of SCK, A7=1) CE SCK 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 A7=1 A 7 SDI A 6 A 5 A 4 A 3 A 2 A 1 A 0 D 7 D 6 D 5 D 4 D 3 D 2 D 1 MSb SDO D 0 LSb High Z Single Byte Read Operation (CP=0, data shifted on rising edge of SCK, data clocked on falling edge of SCK, A7=0) CE SCK 2 1 3 4 5 6 7 8 9 10 11 12 13 14 15 16 A7=0 A 7 SDI A 6 A 5 A 4 A 3 SDO A 2
PAGE 15
TC72 5.0 INTERNAL REGISTER STRUCTURE TC72 registers are listed below. TABLE 5-1: REGISTERS FOR TC72 Read Address Write Address Bit 7 Bit 6 Bit 5 Bit 4 Control 00hex 80hex 0 0 0 One-Shot (OS) 0 1 LSB Temperature 01hex N/A T1 T0 0 0 0 0 MSB Temperature 02hex N/A T9 T8 T7 T6 Manufacturer ID 03hex N/A 0 1 0 1 Register 5.
PAGE 17
TC72 6.0 APPLICATIONS INFORMATION The TC72 does not require any additional components in order to measure temperature; however, it is recommended that a decoupling capacitor of 0.1mF to 1mF be provided between the VDD and GND pins. Although the current consumption of the TC72 is modest (250 mA, typical), the TC72 contains an on chip data acquisition with internal digital switching circuitry. Thus, it is considered good design practice to use an external decoupling capacitor with the sensor.
PAGE 18
TC72 7.0 PACKAGING INFORMATION 7.1 Package Marking Information 8-Lead MSOP XXXXXX YWWNNN 8-Lead DFN XXXXXXXX MYWW NNN Legend: XX...X Y YY WW NNN e3 * Note: DS21743B-page 18 Example: TC722M 109256 Example: 7228 M109 256 Customer-specific information Year code (last digit of calendar year) Year code (last 2 digits of calendar year) Week code (week of January 1 is week ‘01’) Alphanumeric traceability code Pb-free JEDEC designator for Matte Tin (Sn) This package is Pb-free.
PAGE 19
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PAGE 20
TC72 Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging DS21743B-page 20 © 2011 Microchip Technology Inc.
PAGE 21
TC72 Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging © 2011 Microchip Technology Inc.
PAGE 22
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PAGE 23
TC72 APPENDIX A: REVISION HISTORY Revision B (July 2011) The following is the list of modifications: 1. 2. 3. 4. Updated DFN pin drawing. Added new chapter Section 3.0 “PIN Description”. Moved Typical Application figure in Section 6.0 “Applications information” (see Figure 6-1). Updated Section 7.0 “Packaging Information” Revision A (October 2002) • Original data sheet for the TC72 device. © 2011 Microchip Technology Inc.
PAGE 25
TC72 PRODUCT IDENTIFICATION SYSTEM To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office. PART NO. Device XX X Voltage Temperature Range Range /XX Package Device: TC72: Digital Temperature Sensor w/SPI Interface Voltage Range: 2.8 3.3 5.0 = Accuracy Optimized for 2.8V = Accuracy Optimized for 3.3V = Accuracy Optimized for 5.
PAGE 27
Note the following details of the code protection feature on Microchip devices: • Microchip products meet the specification contained in their particular Microchip Data Sheet. • Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions. • There are dishonest and possibly illegal methods used to breach the code protection feature.
PAGE 28
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