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TMP422-EP Folha de dados(PDF) 8 Page - Texas Instruments |
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TMP422-EP Folha de dados(HTML) 8 Page - Texas Instruments |
8 / 28 page TMP422 DX1 (4) DX2 (4) 5 2 1 R S (2) R S (2) C DIFF (3) C DIFF (3) R S (2) R S (2) GND Diode-connectedconfiguration : (1) SeriesResistance Transistor-connectedconfiguration : (1) DX3 (4) DX4 (4) 4 3 R S (2) R S (2) C DIFF (3) 0.1 F m 10kW (typ) 10kW (typ) V+ 8 7 6 SCL SDA +5V SMBus Controller DXP1 DXN1 DXP2 DXN2 TMP422-EP SBOS577 – SEPTEMBER 2011 www.ti.com APPLICATION INFORMATION The TMP422 (three-channel) is a digital temperature sensor that combines a local die temperature measurement channel and two remote junction temperature measurement channels in a single SOT23-8 package. This device is two-wire- and SMBus interface-compatible and are specified over a temperature range of –55°C to +125°C. The TMP422 contains multiple registers for holding configuration information and temperature measurement results. The TMP422 requires transistors connected between DX1 and DX2 and between DX3 and DX4. Unused channels on the TMP422 must be connected to GND. The TMP422 SCL and SDA interface pins each require pull-up resistors as part of the communication bus. A 0.1 μF power-supply bypass capacitor is recommended for local bypassing. Figure 11 illustrates a typical application for the TMP422. (1) Diode-connected configuration provides better settling time. Transistor-connected configuration provides better series resistance cancellation. (2) RS (optional) should be < 1.5kΩ in most applications. Selection of RS depends on application; see the Filtering section. (3) CDIFF (optional) should be < 1000pF in most applications. Selection of CDIFF depends on application; see the Filtering section and Figure 6, Remote Temperature Error vs Differential Capacitance. (4) TMP422 SMBus slave address is 1001 100 when connected as shown. Figure 11. TMP422 Basic Connections 8 Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated Product Folder Link(s): TMP422-EP |
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