May 2004
LM41
Hardware Monitor with Thermal Diode Inputs and
™
SensorPath Bus
General Description
— Internal scaling resistors for all inputs
— Monitors +1.2V, +2.5 V, +3.3 V, +5 V and +12 V
The LM41 is a hardware monitor that measures 2 tempera-
ture zones, 5 voltages and has a single-wire interface com-
patible with National Semiconductor’s SensorPath bus. Sen-
sorPath data is pulse width encoded, thereby allowing the
LM41 to be easily connected to many general purpose
micro-controllers. Several National Semiconductor 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.
n Temperature Sensing
— Remote diode temperature sensor zone
— Internal local temperature zone
— 0.5 ˚C resolution
— Measures temperatures up to 140 ˚C
n 14-lead TSSOP package
Key Specifications
n Voltage Measurement Accuracy
n Temperature Sensor Accuracy
n Temperature Range:
2 % (max)
3 ˚C (max)
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 tem-
peratures up to 255˚C and down to -256˚C. The operating
temperature range of the LM41 is 0˚C to +125˚C. Using Σ∆
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.
— LM41 junction
— Remote Temp Accuracy
n Power Supply Voltage
n Average Power Supply Current
n Conversion Time (all Channels)
0 ˚C to +85 ˚C
0 ˚C to +100 ˚C
+3.0 V to +3.6 V
0.5 mA (typ)
22.1ms to 1456ms
Applications
n Microprocessor based equipment
Features
(Motherboards, Video Cards, Base-stations, Routers,
ATMs, Point of Sale, …)
n Power Supplies
n
SensorPath Interface
— 2 hardware programmable addresses
n Voltage Monitoring
— 9-bit Σ∆ ADC
Typical Application
20070301
™
SensorPath is a trademark of National Semiconductor Corporation
© 2004 National Semiconductor Corporation
DS200703
www.national.com