PDF TMP275 Data sheet ( Hoja de datos )

Número de pieza	TMP275
Descripción	Digital Out Temperature Sensor
Fabricantes	Burr-Brown
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No Preview Available ! www.DataSheet4U.com TMP275 SBOS363A − JUNE 2006 − REVISED JUNE 2006 0.5°C Digital Out Temperature Sensor FEATURES D 8 ADDRESSES D DIGITAL OUTPUT: Two-Wire Serial Interface D RESOLUTION: 9- to 12-Bits, User-Selectable D ACCURACY: ±0.5°C (max) from +10°C to +85°C ±0.75°C (max) from +0°C to +100°C D LOW QUIESCENT CURRENT: 50µA, 0.1µA Standby D WIDE SUPPLY RANGE: 2.7V to 5.5V D SMALL MSOP-8 PACKAGE DESCRIPTION The TMP275 is a 0.5°C accurate, two-wire, serial output temperature sensor available in the MSOP-8 package. The TMP275 is capable of reading temperatures with a resolution of 0.0625°C. The TMP275 is SMBus-compatible and allows up to eight devices on one bus. It is ideal for extended temperature measurement in a variety of communication, computer, consumer, environmental, industrial, and instrumentation applications. The TMP275 is specified for operation over a temperature range of −40°C to +125°C. APPLICATIONS D POWER-SUPPLY TEMPERATURE MONITORING D COMPUTER PERIPHERAL THERMAL PROTECTION D NOTEBOOK COMPUTERS D CELL PHONES D BATTERY MANAGEMENT D OFFICE MACHINES D THERMOSTAT CONTROLS D ENVIRONMENTAL MONITORING AND HVAC D ELECTROMECHANICAL DEVICE TEMPERATURE Temperature SDA 1 Diode Temp. Sensor SCL ALERT 2 ∆Σ A/D 3 Converter Control Logic 8 V+ 7 A0 Serial Interface 6 A1 GND 4 OSC Config. and Temp. Register 5 A2 TMP275 TEMPERATURE ERROR AT 25_C 0.500 0.375 0.250 0.125 0 −0.125 TEMPERATURE ERROR vs TEMPERATURE −0.250 −0.375 36 Units Shown −0.500 −55 −35 −15 5 25 45 65 85 105 125 130 Temperature Error (_C) Temperature (_ C) 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. All 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 Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright  2006, Texas Instruments Incorporated www.ti.com 1 page www.DataSheet4U.com TMP275 www.ti.com APPLICATIONS INFORMATION The TMP275 is a digital temperature sensor that is optimal for thermal management and thermal protection applications. The TMP275 is Two-Wire and SMBus interface-compatible, and is specified over a temperature range of −40°C to +125°C. The TMP275 requires no external components for operation except for pull-up resistors on SCL, SDA, and ALERT, although a 0.1µF bypass capacitor is recommended, as shown in Figure 1. V+ To Two−Wire Controller SCL SDA 8 7 2 6 1 TMP275 5 3 4 0.1µF A0 A1 A2 ALERT (Output) NOTE: SCL, SDA, and ALERT pins require pull−up resistors. GND Figure 1. Typical Connections of the TMP275 The sensing device of the TMP275 is the chip itself. Thermal paths run through the package leads as well as the plastic package. The lower thermal resistance of metal causes the leads to provide the primary thermal path. To maintain accuracy in applications requiring air or surface temperature measurement, care should be taken to isolate the package and leads from ambient air temperature. A thermally-conductive adhesive will assist in achieving accurate surface temperature measurement. POINTER REGISTER Figure 2 shows the internal register structure of the TMP275. The 8-bit Pointer Register of the devices is used to address a given data register. The Pointer Register uses the two LSBs to identify which of the data registers should respond to a read or write command. Table 1 identifies the bits of the Pointer Register byte. Table 2 describes the pointer address of the registers available in the TMP275. Power-up reset value of P1/P0 is 00. P7 P6 P5 P4 P3 P2 P1 P0 0 0 0 0 0 0 Register Bits Table 1. Pointer Register Byte SBOS363A − JUNE 2006 − REVISED JUNE 2006 Pointer Register Temperature Register Configuration Register TLOW Register I/O Control Interface SCL SDA THIGH Register Figure 2. Internal Register Structure of the TMP275 P1 P0 REGISTER 0 0 Temperature Register (READ Only) 0 1 Configuration Register (READ/WRITE) 1 0 TLOW Register (READ/WRITE) 1 1 THIGH Register (READ/WRITE) Table 2. Pointer Addresses of the TMP275 TEMPERATURE REGISTER The Temperature Register of the TMP275 is a 12-bit, read-only register that stores the output of the most recent conversion. Two bytes must be read to obtain data, and are described in Table 3 and Table 4. Note that byte 1 is the most significant byte, followed by byte 2, the least significant byte. The first 12 bits are used to indicate temperature, with all remaining bits equal to zero. The least significant byte does not have to be read if that information is not needed. Data format for temperature is summarized in Table 5. Following power-up or reset, the Temperature Register will read 0°C until the first conversion is complete. D7 D6 D5 D4 D3 D2 D1 D0 T11 T10 T9 T8 T7 T6 T5 T4 Table 3. Byte 1 of Temperature Register D7 D6 D5 D4 D3 D2 D1 D0 T3 T2 T1 T0 0 0 0 0 Table 4. Byte 2 of Temperature Register 5 5 Page www.DataSheet4U.com www.ti.com SCL 1 91 TMP275 SBOS363A − JUNE 2006 − REVISED JUNE 2006 9 … SDA 1 0 0 1 0 0 0 R/W 0 0 0 0 0 0 P1 P0 … Start By Master Frame 1 Two−Wire Slave Address Byte ACK By TMP275 ACK By TMP275 Frame 2 Pointer Register Byte SCL (Continued) 1 91 9 … SDA (Continued) Start By Master 1 0 0 1 0 0 0 R/W D7 D6 D5 D4 D3 D2 D1 D0 Frame 3 Two−Wire Slave Address Byte ACK By TMP275 From TMP275 Frame 4 Data Byte 1 Read Register … ACK By Master SCL (Continued) 1 9 SDA (Continued) D7 D6 D5 D4 D3 D2 D1 D0 From TMP275 ACK By Master Frame 5 Data Byte 2 Read Register Stop By Master NOTE: Address Pins A0, A1, A2 = 0 Figure 6. Two-Wire Timing Diagram for Read Word Format ALERT SCL 1 91 9 SDA 0 0 0 1 1 0 0 R/W 1 0 0 1 0 0 0 S tatu s Start By Master ACK By TMP275 Frame 1 SMBus ALERT Response Address Byte From TMP275 Frame 2 Slave Address Byte NACK By Stop By Master Master NOTE: Address Pins A0, A1, A2 = 0 Figure 7. Timing Diagram for SMBus ALERT 11 11 Page

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