Mysentech T1820B

The T1820X series is a mixed-signal digital-analog temperature sensing IC with a maximum measurement accuracy of ±0.1°C, requiring no user calibration. The temperature sensing principle is based on the characteristic relationship between CMOS semiconductor PN junction temperature and bandgap voltage. After small-signal amplification, analog-to-digital conversion, and digital calibration compensation, the output is delivered via a digital bus. Key advantages include high accuracy, excellent consistency, fast temperature measurement, low power consumption, flexible programmable configuration, and long service life.

The IC features a built-in 16-bit ADC with a resolution of 0.004°C and an ultra-wide operating range of -103°C to +153°C. Each IC undergoes 100% testing and calibration before shipment, with calibration coefficients fitted according to temperature error characteristics and compensation calculations performed automatically on-chip. To simplify system integration, functions such as ID search, temperature data memory access, and feature configuration are all based on the digital 1-Wire protocol (OneWire, OW) command set, requiring only a single GPIO port on the host microprocessor for read/write access. The 1-Wire communication interface enables multi-node sensing acquisition and networking over a shared single data bus, offering a low-cost solution with long transmission distances and support for a large number of nodes, making it well-suited for spatially distributed sensor networks. Up to 100 nodes can be daisy-chained in series over network lengths of 100–500 meters.

The IC features a built-in non-volatile E²PROM memory cell for storing the chip ID, high/low temperature alarm thresholds, temperature calibration correction values, and user-defined information such as sensor node numbers and location data.

• Temperature measurement range: -103°C ~ +153°C
• Low power consumption: typical standby current 0.01μA, average measurement current 2μA (AVG = 8, 1 measurement/s)
• Wide operating voltage range: 1.8V ~ 5.5V
• Configurable measurement accuracy: ±0.1°C / ±0.5°C
• Temperature measurement resolution: 16-bit output 0.004°C
• Configurable temperature conversion time: 15.3ms / 8.5ms / 5.2ms / 2.2ms
• Up to 112-bit additional E²PROM space for user data storage
• Standard 1-Wire interface
• Heater chip self-diagnostic function

• PT100/PT1000 replacement solution
• NTC replacement solution
• Electronic thermometer
• Ultra-low temperature cold chain logistics
• Heat meter, gas meter, water meter
• Board-level temperature monitoring
• Industrial instrumentation
• Power terminal temperature measurement