Overview
The TMP422AIDCNT is a remote temperature sensor monitor produced by Texas Instruments. It is part of the TMP421, TMP422, and TMP423 family, which are designed to monitor both local and remote temperatures. The device features a built-in local temperature sensor and can measure remote temperatures using diode-connected transistors, typically low-cost NPN- or PNP-type transistors or diodes integrated into microcontrollers, microprocessors, or FPGAs. The TMP422 offers high accuracy with ±1°C remote temperature accuracy and ±1.5°C local temperature accuracy, requiring no calibration. It communicates via a two-wire/SMBus serial interface and supports multiple interface addresses.
Key Specifications
| Parameter | Value |
|---|---|
| Package | SOT-23-8 (DCN) |
| Pins | 8 |
| Operating Temperature Range (°C) | -40 to 125 |
| Supply Voltage (V+) | 2.7 to 5.5 V |
| Remote Temperature Accuracy (°C) | ±1°C (max) |
| Local Temperature Accuracy (°C) | ±1.5°C (max) |
| Resolution | 12 bits (local and remote) |
| Conversion Time (per channel) | 100 to 130 ms |
| SMBus Clock Frequency | 3.4 MHz |
| Quiescent Current | 32 to 38 μA (eight conversions per second) |
| Storage Temperature Range (°C) | -60 to +130 |
Key Features
- SOT23-8 and DSBGA (WCSP) packages
- ±1°C remote diode sensor accuracy and ±1.5°C local temperature sensor accuracy
- Series resistance cancellation and programmable non-ideality factor
- Wide remote temperature measurement range (up to +150°C)
- Diode fault detection
- Two-wire/SMBus serial interface with multiple interface addresses
- RoHS compliant and no Sb/Br
Applications
- Processor/FPGA temperature monitoring
- LCD/DLP/LCOS projectors
- Servers
- Central office telecom equipment
- Storage Area Networks (SAN)
Q & A
- What is the operating temperature range of the TMP422AIDCNT?
The operating temperature range is -40°C to 125°C.
- What is the accuracy of the remote temperature sensor?
The remote temperature accuracy is ±1°C.
- What is the local temperature accuracy?
The local temperature accuracy is ±1.5°C.
- What type of interface does the TMP422AIDCNT use?
The device uses a two-wire/SMBus serial interface.
- What is the resolution of the temperature measurements?
The resolution is 12 bits for both local and remote temperature measurements.
- What is the conversion time per channel?
The conversion time per channel is between 100 to 130 ms.
- Does the TMP422AIDCNT support multiple interface addresses?
Yes, it supports multiple interface addresses.
- What is the SMBus clock frequency?
The SMBus clock frequency is 3.4 MHz.
- Is the TMP422AIDCNT RoHS compliant?
Yes, it is RoHS compliant and contains no Sb/Br.
- What are some common applications of the TMP422AIDCNT?
Common applications include processor/FPGA temperature monitoring, LCD/DLP/LCOS projectors, servers, central office telecom equipment, and Storage Area Networks (SAN).
