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TMP421 データシート(PDF) 9 Page - Texas Instruments |
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TMP421 データシート(HTML) 9 Page - Texas Instruments |
9 / 34 page 0.1 F m 10kW (typ) 10kW (typ) TMP421 DXP DXN V+ 8 7 6 5 2 1 R S (2) R S (2) C DIFF (3) C DIFF (3) R S (2) R S (2) GND SCL SDA +5V SMBus Controller Diode-connectedconfiguration : (1) SeriesResistance Transistor-connectedconfiguration : (1) A1 A0 4 3 TMP421 TMP422 TMP423 www.ti.com SBOS398C – JULY 2007 – REVISED MAY 2012 APPLICATION INFORMATION The TMP421 is a two-channel digital temperature For proper remote temperature sensing operation, the sensor that combines a local die temperature- TMP421 requires only a transistor connected measurement channel and a remote-junction between DXP and DXN pins. If the remote channel is temperature-measurement channel, and is available not utilized, DXP can be left open or tied to GND. in SOT23-8 and DSBGA-8 packages. The TMP422 The TMP422 requires transistors connected between (three-channel), and TMP423 (four-channel) are DX1 and DX2 and between DX3 and DX4. Unused digital temperature sensors that combine a local die channels on the TMP422 must be connected to GND. temperature measurement channel and two or three The TMP423 requires a transistor connected to each remote junction temperature measurement channels, positive channel (DXP1, DXP2, and DXP3), with the respectively, in a single SOT23-8 package. These base of each channel tied to the common negative, devices are two-wire- and SMBus interface- DXN. For an unused channel, the TMP423 DXP pin compatible and are specified over a temperature can be left open or tied to GND. range of –40°C to +125°C. The TMP421/22/23 each contain multiple registers for holding configuration The TMP421/22/23 SCL and SDA interface pins each information and temperature measurement results. 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, Figure 12, and Figure 13 show typical configurations for the TMP421, TMP422, and TMP423, respectively. (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. Figure 11. TMP421 Basic Connections Copyright © 2007–2012, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Link(s): TMP421 TMP422 TMP423 |
同様の部品番号 - TMP421 |
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同様の説明 - TMP421 |
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