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Features
SensorPath Interface
2 hardware programmable addresses
Voltage Monitoring
9-bit ΣΔ ADC
Internal scaling resistors for all inputs
Monitors +1.2V, +2.5 V, +3.3 V, +5 V and +12 V
Temperature Sensing
Remote diode temperature sensor zone
Internal local temperature zone
0.5 °C resolution
Measures temperatures up to 140 °C
14-lead TSSOP package
Description The
LM41 is a hardware monitor that measures 2 temperature zones, 5 voltages and has a single-wire interface SensorPath bus. SensorPath
data is pulse width encoded, thereby allowing the LM41 to be easily connected to many general purpose micro-controllers. Several
Winbond Electronics Super I/O products include a fully integrated SensorPath master, that when connected to the
LM41 can realize a hardware monitor function that includes limit checking for measured values, autonomous fan speed control and
many other functions.
The
LM41 measures the temperature of its own die as well as one external device such as a processor thermal diode or a diode connected
transistor. The
LM41 can resolve temperatures up to 255°C and down to -256°C. The operating temperature range of the LM41 is 0°C to +125°C. Using
ΣΔ ADC it measures +1.2V, +2.5V, +3.3V, +5V and +12V analog input voltages with internal scaling resistors. The address programming
pin allows two
LM41's to be placed on one SensorPath bus.
Key Specification
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Voltage Measurement Accuracy
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±2 % (max)
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Temperature Sensor Accuracy
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±3 °C (max)
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Temperature Range:
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LM41 junction
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0 °C to +85 °C
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Remote Temp Accuracy
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0 °C to +100 °C
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Power Supply Voltage
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+3.0 V to +3.6 V
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Average Power Supply Current
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0.5 mA (typ)
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Conversion Time (all Channels)
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22.1ms to 1456ms
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Applications
Microprocessor based equipment
(Motherboards, Video Cards, Base-stations, Routers, ATMs, Point of Sale, …)
Power Supplies
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