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A thermostat is a device intended to regulate the temperature of a system, room or building so it is kept near a desired set point temperature. NXP’s thermostat reference design is an example of how a thermostat can be built taking advantage of the features of the MC9S08LL16. Application Note AN3990, located on the NXP website, provides step-by-step instructions for migrating this design to the 9S08LL64. The thermostat works with two AA batteries and can work in low power mode either with a 2 x 26 LCD display (consuming 2-4µA) or a 8 x 24 LCD display (consuming 7 to 9µA). The thermostat provides standard HVAC connectivity, temperature sensors, and programmable heat/cool features using a button interface.
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