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TMP423AQDCNRQ1 Datasheet(PDF) 10 Page - Texas Instruments |
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TMP423AQDCNRQ1 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 38 page ADC Oscillator Voltage Reference M U X Register Bank Serial Interface Control Logic MUX 5 × I 2 × I I 6 7 4 8 1 2 5 V+ Local Thermal BJT A0 SCL SDA DXN DXP GND V+ 20 × I 3 A1 Copyright © 2016, Texas Instruments Incorporated 10 TMP421-Q1, TMP422-Q1, TMP423-Q1 SBOS821 – NOVEMBER 2016 www.ti.com Product Folder Links: TMP421-Q1 TMP422-Q1 TMP423-Q1 Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated 8 Detailed Description 8.1 Overview The TMP421-Q1 is a two-channel digital temperature sensor that combines a local die temperature- measurement channel and a remote-junction temperature-measurement channel, and is available in an 8-pin SOT-23 package. The TMP422-Q1 (three-channel), and TMP423-Q1 (four-channel) are digital temperature sensors that combine a local die temperature measurement channel and two or three remote junction temperature measurement channels, respectively, in a single 8-pin SOT-23 package. These devices are two- wire- and SMBus interface-compatible and are specified over a temperature range of –40°C to +125°C. The TMP421-Q1, TMP422-Q1, and TMP423-Q1 each contain multiple registers for holding configuration information and temperature measurement results. For proper remote temperature sensing operation, the TMP421-Q1 requires only a transistor connected between DXP and DXN pins. If the remote channel is not utilized, DXP can be left open or tied to GND. The TMP422-Q1 requires transistors connected between DX1 and DX2 and between DX3 and DX4. Unused channels on the TMP422-Q1 must be connected to GND. The TMP423-Q1 requires a transistor connected to each positive channel (DXP1, DXP2, and DXP3), with the base of each channel tied to the common negative, DXN. For an unused channel, the TMP423-Q1 DXP pin can be left open or tied to GND. 8.2 Functional Block Diagram Figure 12. The TMP421-Q1 Supports Multiple Slave Addresses and a Single Remote Diode Input |
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