Microcontroller with on-chip linear temperature sensor

Details Microcontroller with on-chip linear temperature sensor Microcontroller with on-chip linear temperature sensor

1995-10-10

1997-04-08

Voeltz, Emanuel T.

Boots, shoes, and leggings

364550, 36455101, 364481, 320 35, 320 39, G06F 922

Patent

active

056194307

ABSTRACT:
A microcontroller for use in battery charging and monitoring applications is disclosed. The microcontroller includes a microprocessor and various front-end analog circuitry including a slope A/D converter and a multiplexer for allowing a plurality of analog input signals to be converted to corresponding digital counts indicative of signal level. The microcontroller further includes an on-chip temperature sensor, used in conjunction with the A/D converter, to monitor the temperature of the microcontroller. The temperature sensor generates and uses a differential voltage that is obtained across the base-emitter functions of two compatible bipolar transistors having dissimilar emitter areas. This differential voltage is proportional to temperature and may be sampled by the A/D converter to obtain a digital count indicative of the temperature of the microcontroller.

REFERENCES:
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patent: 5335540 (1994-08-01), Bowler et al.
patent: 5339018 (1994-08-01), Brokaw
patent: 5388134 (1995-02-01), Douglass et al.
Habicet al., Temperature Compensation of Crystal Oscillators, Using Microcontroller -uCTCXO, 1994 IEEE International Frequency Control Symposium, Jan. 1994, pp. 587-593.

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