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ZEUS Technical Manual Detailed hardware description
© 2007 Eurotech Ltd Issue D 61
Temperature sensor
There is a Philips LM75A temperature sensor on the ZEUS. The LM75A is a
temperature-to-digital converter using an on-chip band-gap temperature sensor and
sigma-delta A-to-D conversion technique. The device is also a thermal detector
providing an over-temperature detection output (OVERTEMP signal on GPIO96 of
PXA270). The accuracy of LM75A is ±2 °C (at -25 °C to 100 °C), and ±3 °C (at -55 °C
to 125 °C). LM75A is connected to the I
2
C bus of PXA270 processor, and is accessible
at I
2
C bus address 0x48.