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The world's smallest CMOS digital-analog hybrid ultra-low static power temperature sensor chip CT1711

Published :3/14/2019 4:26:00 PM

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According to the report of Memes, recently, Shanghai Shen Yuling designed the world's smallest CMOS digital-analog hybrid ultra-low static power temperature sensor chip CT1711. This is an ultra-small, ultra-high-precision, low-power, low-voltage temperature sensor with a Single Wire Lite interface protocol that eliminates the need for calibration. It is suitable for all high-precision, low-power, cost-effective temperature sensing applications. Such as Internet of Things (IoT) sensor nodes, medical thermometers, high-precision temperature probes, high-precision instrumentation, and battery-powered devices.

CT1711 product introduction

With a typical quiescent current of only 10nA, the CT1711's ultra-low self-heating feature allows it to maintain high accuracy over a wide temperature range. The minimum resolution is 0.00390625 ° C (1/256). Therefore, the CT1711 is an ideal solution for energy metering and thermometer applications that require heat transfer. The highest temperature digital expression can be higher than 128 ° C, CT1711 is also an ideal replacement for RTD and high-precision NTC / PTC thermistors, optimized package design, improve heat transfer. Compatible with ISO10993.5/10, it can directly contact the skin, especially suitable for thermometer application.

  

Figure 1 CT1711 chip front and back photo MCLGA3x3-4

  

Figure 2 CT1711 typical application diagram

CT1711 product features

◆ Working voltage width: 1.8V~5.5V

◆ Single temperature conversion time 120ms

◆ High resolution: up to 0.00390625 °C

◆ Temperature output: S-Wire (Single-Wire Lite) interface protocol

◆ Temperature collection average working current 4.5uA (1 time / sec), standby current as low as 10nA

◆ High-precision chip work accuracy: less than ±0.1 °C in the temperature range of 30 ° C to 45 ° C, as shown below

◆ Temperature response is fast: response time τ≈2s, as shown in Figure 7.

◆ Package: MCLGA3x3-4

  

Figure 3 Repeated measurement error of the CT1711 chip

  

Figure 4 CT1711 chip temperature measurement accuracy relative to the power supply voltage

  

Figure 5 Temperature accuracy of the full temperature range of the CT1711 chip

  

Figure 6 The temperature accuracy distribution of the CT1711 chip

  

Figure 7 Temperature transient response curve of CT1711 chip

CT1711 product application

The specific temperature of the CT1711 is shown in Figure 8. An external 4.7K pull-up resistor is available (the manufacturer can also provide a built-in pull-up resistor). The MCU sends a pulse with a pull-down pulse length of 400us to the CT1711. After 150ms, the MCU can read the 17-bit temperature value from the DIO pin. There is no time limit between the bit and the bit, and no continuous interrupt is required from the MCU. deal with. The specific data format is shown in Figure 9.

  

Figure 8 Typical application of CT1711

  

Figure 9 CT 1711 temperature reading format