Thermostat
Products and reference designs
Thermostat
Overview
Whether you are designing a simple thermostat or a smart thermostat complete with intuitive human machine interface (HMI) and secure wireless connectivity, our reference designs and integrated circuits help you address complex challenges and deliver what is next in thermostat design.
Design requirements
Modern thermostat designs often require:
- Accurate measurement of room temperature despite localized heat generation.
- Multiple power rails and requirement of high efficiency to reduce localized heat.
- Replace electromechanical relay with solid state relays to eliminate clicking noise.
- Intuitive HMI design within space constraints.
- Integrated wireless security.
Extend the capabilities of this application
Block diagram
Find products and reference designs for your system.
Basic thermostat
Relay system
Logic & voltage translation (12)
Inverting buffers & drivers
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CD4069UB—6-ch, 3-V to 18-V inverters
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SN74LVC1G04—Single 1.65-V to 5.5-V inverter
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SN74AUP1G14—Single 0.8-V to 3.6-V low power inverter with Schmitt-Trigger inputs
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SN74AUP3G14—3-ch, 0.8-V to 3.6-V low power inverters with Schmitt-Trigger inputs
NAND gates
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CD4093B—4-ch, 2-input, 3-V to 18-V NAND gates with Schmitt-Trigger inputs
Noninverting buffers & drivers
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SN74LVC1G07—Single 1.65-V to 5.5-V buffer with open-drain outputs
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SN74AUP1G17—Single 0.8-V to 3.6-V low power buffer with Schmitt-Trigger inputs
JK flip-flops
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SN74HC112—Dual J-K Negative-Edge-Triggered Flip-Flops With Clear and Preset
AND gates
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SN74LVC1G08—1-ch, 2-input 1.65-V to 5.5-V 32 mA drive strength AND gate
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SN74AUP2G08—2-ch, 2-input 0.8-V to 3.6-V low power (< 1uA) AND gate
D-type flip-flops
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SN74AUP1G74—Low-Power Single Positive-Edge-Triggered D-Type Flip-Flop
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SN74LVC1G74—Single Positive-Edge-Triggered D-Type Flip-Flop With Clear and Preset
Power management (8)
Low-side switches
MOSFETs
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CSD17483F4—30-V, N channel NexFET™ power MOSFET, single LGA 1 mm x 0.6 mm, 260 mOhm, gate ESD protection
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CSD19537Q3—100-V, N channel NexFET™ power MOSFET, single SON 3 mm x 3 mm, 14.5 mOhm
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CSD87502Q2—30-V, N channel NexFET™ power MOSFET, dual SON 2 mm x 2, 42 mOhm, gate ESD protection
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CSD17382F4—30-V, N channel NexFET™ power MOSFET, single LGA 1 mm x 0.6mm, 67 mOhm, gate ESD protection
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CSD18541F5—60-V, N channel NexFET™ power MOSFET, single LGA 1.5 mm x 0.8mm, 65 mOhm, gate ESD protection
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CSD19538Q2—100-V, N channel NexFET™ power MOSFET, single SON 2 mm x 2 mm, 59 mOhm
Technical documentation
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