The TMP390A3DRLT device is part of a family of ultra-lowpower, dual channel, resistor programmable temperature switches that enable protection anddetection of system thermal events from –50°C to 130°C. The TMP390offers independent overtemperature (hot) and undertemperature (cold) detection. The trip temperatures (TTRIP) and thermalhysteresis (THYST) options are programmed by two E96-series (1%) standarddecade value resistors on the SETA and SETB pins. Each resistor can range from 1.05 K to 909 K,representing one of 48 unique values.
The values of the resistor to ground on SETA input sets the TTRIPthreshold of Channel A. The value of the resistor to ground on SETB input sets theTTRIP threshold of Channel B, as well as the THYSToptions of 5°C, or 10°C for both channels, to prevent undesired digital output switching. Resistorsaccuracy has no impact to TTRIP accuracy.
To enable customer board-level manufacturing, the TMP390supports a trip test function where the digital outputs are activated by exercising the SETA orSETB pin.
Feature
- Resistor programmable temperature trip points and hysteresis options
- Resistor tolerances contribute zero error
- Hysteresis options: 5°C, and 10°C
- Separate outputs for overtemperature or undertemperature detection
- Channel A (overtemperature): +30 to +124°C, 2°C steps
- Channel B (undertemperature): –50 to +25°C, 5°C steps
- Accuracy level options (maximum at 55°C to +130°C):
- A2 Level: ±3.0°C (±1.5°C from 0°C to +70°C)
- A3 Level: ±3.5°C (±2.0°C from 0°C to +70°C)
- Ultra-low power consumption: 0.5 μA typical at 25°C
- Operating temperature range: 55°C to +130°C
- Supply voltage: 1.62 to 5.5 V
- Open-drain outputs
- Trip test function enables in-system testing
- Available in an SOT-563 (1.60-mm × 1.20-mm), 6-pin package
