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TMP423BIDCNRG4 Datasheet(PDF) 8 Page - Texas Instruments |
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TMP423BIDCNRG4 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 30 page www.ti.com APPLICATION INFORMATION 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 SBOS398B – JULY 2007 – REVISED MARCH 2008 The TMP421 (two-channel), TMP422 (three-channel), The TMP422 requires transistors connected between and TMP423 (four-channel) are digital temperature DX1 and DX2 and between DX3 and DX4. Unused sensors that combine a local die temperature channels on the TMP422 must be connected to GND. measurement channel and one, two, or three remote The TMP423 requires a transistor connected to each junction temperature measurement channels in a positive channel (DXP1, DXP2, and DXP3), with the single SOT23-8 package. These devices are base of each channel tied to the common negative, two-wire- and SMBus interface-compatible and are DXN. For an unused channel, the TMP423 DXP pin specified over a temperature range of –40 °C to can be left open or tied to GND. +125 °C. The TMP421/22/23 each contain multiple The TMP421/22/23 SCL and SDA interface pins each registers for holding configuration information and require pull-up resistors as part of the communication temperature measurement results. bus. A 0.1 µF power-supply bypass capacitor is For proper remote temperature sensing operation, the recommended for local bypassing. Figure 11 shows a TMP421 requires only a transistor connected typical configuration for the TMP421; Figure 12 between DXP and DXN pins. If the remote channel is illustrates a typical application for the TMP422. not utilized, DXP can be left open or tied to GND. Figure 13 illustrates a typical application for the TMP423. (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 8 Submit Documentation Feedback Copyright © 2007–2008, Texas Instruments Incorporated Product Folder Link(s): TMP421 TMP422 TMP423 |
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