ADM1033 Rev. 0 is a thermal monitor and fan speed controller with 1 local and 1 remote temperature channel. It supports SMBus 2.0, 1.1, and 1.0, and features automatic series resistance cancellation, programmable over-/undertemperature limits, programmable fault queue, etc.
The ADM1033 integrates a remote and local temperature sensor with a fan‑speed controller. It can monitor a thermal diode or a microprocessor die and drive a cooling fan using either a discrete‑speed or linear lookup‑table mode. The device communicates over a 2‑wire SMBus 2.0 interface and provides ALERT, THERM, and FAN_FAULT open‑drain outputs for fault reporting.
Key features include ±1 °C typical temperature accuracy, 0.03125 °C resolution, programmable over‑/under‑temperature limits, and a fan‑speed measurement accuracy of ±4 %. The part is supplied in a 16‑lead QSOP package and operates from a 3.0 V to 3.6 V supply.
| Supply Voltage (Vcc) | 3.0 V – 3.6 V |
|---|---|
| Supply Current (inactive) | 3 mA |
| Internal Sensor Accuracy (typical) | ±1 °C |
| Resolution | 0.03125 °C |
| Fan Speed Measurement Accuracy | ±4 % |
| TACH Input High Voltage | 2.0 V |
| TACH Input Low Voltage | -0.3 V – 0.8 V |
| SMBus Version | SMBus 2.0 |
The device operates from 3.0 V to 3.6 V.
Fan speed is measured with an accuracy of ±4 %.
It communicates over a 2‑wire SMBus 2.0 interface.
The temperature resolution is 0.03125 °C.