The document describes the functionality and features of a low-cost PC temperature monitor and fan control ASIC chip called ADM1022. The chip features external temperature measurement with remote diode, on-chip temperature sensor, interrupt and over-temperature outputs, fault-tolerant fan control, brownout detection, LDCM support, and system management bus (SMBus), etc.
The ADM1022 is a low-cost temperature monitor and fan controller designed for microprocessor-based systems. It supports external temperature measurement via two channels of remote sensor diodes or an internal on-chip sensor. Measured values can be read out via the serial System Management Bus (SMBus), allowing for limit comparisons to be programmed over the same interface.
The device includes a DAC for fan speed control and provides automatic hardware temperature trip points that drive the fan to full speed if exceeded. It also features two supply voltage monitors for brownout detection, ensuring system stability in network servers, personal computers, test equipment, and office electronics.
| Supply Voltage Range | 3.0 V to 5.5 V |
|---|---|
| Internal Sensor Accuracy | +/- 3 °C |
| External Diode Sensor Accuracy | +/- 5 °C |
| Resolution (Temperature) | 1 °C |
| Total Monitoring Cycle Time | 200 ms |
| Supply Current (Typical) | 1.4 mA |
| Package Type | 16-Lead QSOP |
The device operates with a supply voltage ranging from 3.0 V to 5.5 V.
Yes, it allows for external temperature measurement with two channels of remote sensor diodes.
Measured values can be read out via a serial System Management Bus (SMBus).