Key facts
- Brand
- Analog Devices
- Model
- ADM1021A
- Industry
- Industrial
- Documents
- 2
- Languages
- EN
- Last added
- 2012-06-08
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Analog Devices ADM1021A Microprocessor System Temperature Monitor Datasheet
The ADM1021A is a two-channel digital thermometer and under/over temperature alarm designed for use in personal computers and other systems requiring thermal monitoring. It measures the temperature of a microprocessor using a diode-connected PNP transistor or a discrete NPN/PNP device, as well as an on-chip temperature sensor to monitor the device and its environment. A novel measurement technique cancels out the absolute value of the transistor's base emitter voltage, eliminating the need for calibration.
The device communicates over a two-wire serial interface compatible with SMBus standards. Users can program under and over temperature limits via the serial bus, and an ALERT output signals when the on-chip or remote temperature is out of range. This output can function as an interrupt or an SMBus alert. The ADM1021A operates with a supply voltage range of 3 V to 5.5 V and features a small 16-lead QSOP package.
Analog Devices ADM1021A specifications
| Temperature Resolution | 1 °C |
|---|---|
| Temperature Error, Local Sensor | +1 °C / -3 °C |
| Temperature Error, Remote Sensor | 3 °C / -5 °C |
| Supply Voltage Range | 3 V to 5.5 V |
| Standby Supply Current | 1 pA |
| Average Operating Supply Current | 130 pA |
| Conversion Time | 65 ms |
| SMBus Clock Frequency | 100 kHz |
| Operating Temperature Range | -55°C to +125°C |
| Package Type | 16-Lead QSOP |
Source: Analog Devices ADM1021A Microprocessor System Temperature Monitor Datasheet
All Analog Devices ADM1021A documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
Does the ADM1021A require calibration?
No, a novel measurement technique cancels out the absolute value of the transistor's base emitter voltage, so that no calibration is required.
From: Analog Devices ADM1021A Microprocessor System Temperature Monitor Datasheet
What is the accuracy for the on-chip sensor?
The accuracy for the on-chip sensor is 1°C.
From: Analog Devices ADM1021A Microprocessor System Temperature Monitor Datasheet
What is the supply voltage range for the ADM1021A?
The device operates from 3.0 V to 3.6 V.
How many temperature channels does the ADM1021A provide?
It provides two temperature channels – one on‑chip and one remote.