Digital Temperature Sensor MICROCHIP TCN75AVOA with Configurable Polarity Alert and Operation Modes
Product Overview
The Microchip Technology Inc. TCN75A is a digital temperature sensor that converts ambient temperatures ranging from -40C to +125C into a digital word with a typical accuracy of 1C. It features user-programmable registers for flexible temperature sensing applications, allowing for user-selectable temperature measurement resolutions from 0.5C down to 0.0625C. The device supports power-saving Shutdown and One-shot modes, and can generate an alert signal with configurable polarity for thermostat or interrupt operations. Its industry-standard 2-wire, I2C compatible serial interface enables control of up to eight devices on a single bus, making it ideal for low-cost, sophisticated multi-zone temperature monitoring applications.
Product Attributes
- Brand: Microchip Technology Inc.
- Product Name: TCN75A
- Interface: I2C Compatible (2-wire)
- Available Packages: MSOP-8, SOIC-8
Technical Specifications
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions |
|---|---|---|---|---|---|---|
| Temperature Sensor Accuracy | TACY | -2 | ±1 | +2 | °C | TA = -40°C to +125°C, VDD = 3.3V |
| Operating Voltage Range | VDD | 2.7 | — | 5.5 | V | — |
| Operating Current | IDD | — | 200 | 500 | µA | Continuous operation |
| Shutdown Current | ISHDN | — | 0.1 | 2 | µA | Shutdown mode |
| Power-on Reset (POR) Threshold | VPOR | — | 1.7 | — | V | VDD falling edge |
| Line Regulation | Δ°C/ΔVDD | — | 0.2 | — | °C/V | VDD = 2.7V to 5.5V |
| Internal ΣΔ ADC Conversion Time (0.5°C Resolution) | tCONV | — | 30 | — | ms | 33 samples/sec (typical) |
| Internal ΣΔ ADC Conversion Time (0.25°C Resolution) | tCONV | — | 60 | — | ms | 17 samples/sec (typical) |
| Internal ΣΔ ADC Conversion Time (0.125°C Resolution) | tCONV | — | 120 | — | ms | 8 samples/sec (typical) |
| Internal ΣΔ ADC Conversion Time (0.0625°C Resolution) | tCONV | — | 240 | — | ms | 4 samples/sec (typical) |
| Alert Output High-level Current | IOH | — | — | 1 | µA | VOH = 5V |
| Alert Output Low-level Voltage | VOL | — | — | 0.4 | V | IOL = 3 mA |
| Thermal Response Time (63%) | tRES | — | 1.4 | — | s | 27°C (air) to 125°C (oil bath) |
| Specified Temperature Range | TA | -40 | — | +125 | °C | Note 1 |
| Operating Temperature Range | TA | -40 | — | +125 | °C | — |
| Storage Temperature Range | TA | -65 | — | +150 | °C | — |
| Thermal Resistance (8L-SOIC) | θJA | — | 163 | — | °C/W | — |
| Thermal Resistance (8L-MSOP) | θJA | — | 206 | — | °C/W | — |
| Serial Port Frequency | fSC | 0 | — | 400 | kHz | I2C Compatible |
| Clock Period | tSC | 2.5 | — | — | µs | — |
| Low Clock Time | tLOW | 1.3 | — | — | µs | — |
| High Clock Time | tHIGH | 0.6 | — | — | µs | — |
| Rise Time | tR | 20 | — | 300 | ns | 10% to 90% of VDD (SCL, SDA) |
| Fall Time | tF | 20 | — | 300 | ns | 90% to 10% of VDD (SCL, SDA) |
| Data Setup Before SCL High | tSU-DATA | 0.1 | — | — | µs | — |
| Data Hold After SCL Low | tH-DATA | 0 | — | — | µs | — |
| Start Condition Setup Time | tSU-START | 0.6 | — | — | µs | — |
| Start Condition Hold Time | tH-START | 0.6 | — | — | µs | — |
| Stop Condition Setup Time | tSU-STOP | 0.6 | — | — | µs | — |
| Bus Idle Time | tB-FREE | 1.3 | — | — | µs | — |
| Input High-level Voltage | VIH | 0.7 VDD | — | — | V | — |
| Input Low-level Voltage | VIL | — | — | 0.3 VDD | V | — |
| Input Current | IIN | -1 | — | +1 | µA | — |
| Output Low-level Voltage | VOL | — | — | 0.4 | V | IOL = 3 mA |
| Output High-level Current | IOH | — | — | 1 | µA | VOH = 5V |
| Low-level Current | IOL | 6 | — | — | mA | VOL = 0.6V |
| Capacitance | CIN | — | 10 | — | pF | SDA and SCL Inputs |
| Hysteresis Voltage | VHYST | 0.05 VDD | — | — | V | — |
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