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2 Threads found on edaboard.com: Temperature Sensor 89c51
hi The best solution for your problem is the Bood written by M. ali mazidi. it is the best book with alots of examples in assembly and c. there is a good topic on temperature senser using atmel 89c51 and ADC 08xxx.
The LM35A will give you a worst-case accuracy of ?1°C over its temperature range - clearly not adequate for your design specification. A 24-bit ADC has a resolution that is way too much for your needs. I think you should revise your design parameters... /Rambo