ZS18B20A (12-Bit Digital Temperature Sensor IC)

Key Features

• High measurement accuracy: ±0.5°C from -10°C to +85°C, with no user calibration required.
• Wide temperature measurement range: -55°C to +125°C.
• 12-bit temperature resolution: 0.0625°C per increment.
• Fast temperature conversion: 40 ms conversion time.
• Ultra-low power consumption: Peak current consumption as low as 30 µA.
• Standard 1-Wire interface: Supports distributed, multipoint temperature monitoring using a single microcontroller GPIO pin.
• Unique 64-bit identification: Each sensor has an individual 64-bit serial number for identification in multi-sensor networks.
• Programmable temperature alarms: User-configurable high and low temperature thresholds (TH and TL).
• Nonvolatile memory: Stores sensor identification, alarm thresholds, calibration correction values, and user-defined information.
• DS18B20 compatibility: Compatible with most DS18B20 communication timing and software implementations.
• Pin-compatible replacement: TO-92 package with the same pin configuration as the DS18B20.

Additional Details

The ZS18B20A is a high-precision, low-power digital temperature sensor IC designed for industrial monitoring, distributed temperature measurement, and embedded electronic applications.

Combining analog temperature sensing with digital signal processing, the sensor provides an accuracy of ±0.5°C across the -10°C to +85°C range, with an overall measurement range of -55°C to +125°C.

Each sensor is factory-tested and calibrated, with internal compensation calculations automatically correcting temperature measurement errors. This eliminates the need for additional user calibration.

The ZS18B20A features a standard 1-Wire digital communication interface, allowing multiple sensors to communicate over a shared data bus. Sensor identification, temperature readings, memory access, and configuration are handled through digital commands, requiring only a single GPIO pin on the host microcontroller.

Each chip includes a unique 64-bit identification number and built-in nonvolatile memory for storing temperature alarm thresholds, calibration correction values, and user-defined information such as sensor node numbers and installation locations.

Designed for compatibility with existing DS18B20 systems, the ZS18B20A supports most DS18B20 communication timing requirements and can generally be integrated into existing DS18B20 software with minimal modification. Its TO-92 package uses the same pin configuration, enabling pin-for-pin hardware replacement.

With its fast 40 ms temperature conversion time, 12-bit resolution, and ultra-low peak current consumption of 30 µA, the ZS18B20A is suitable for industrial monitoring systems, smart hardware, agricultural monitoring, instrumentation, and other distributed temperature-sensing applications.

Technical Specifications

Temperature measurement range	-55°C to +125°C
Temperature accuracy	±0.5°C (-10°C to +85°C)
ADC resolution	12-bit
Temperature resolution	0.0625°C
Temperature conversion time	40 ms
Operating voltage	1.8–5.5 V DC
Peak current consumption	30 µA
Communication interface	1-Wire digital bus
Parasite power mode	Supported (2-wire operation)
Unique sensor identification	64-bit serial number
Temperature alarm thresholds	Programmable TH and TL
Memory	Nonvolatile memory
Package	TO-92
Pin configuration	GND, DQ, VDD
DS18B20 compatibility	Timing-compatible with most implementations; pin-compatible TO-92 replacement
Factory calibration	100% tested and calibrated