GX18B20SH Programmable Resolution Single-Bus Temperature Sensor
The GX18B20SH digital thermometer offers 9 to 12-bit programmable resolution temperature measurements with programmable non-volatile memory for upper and lower alarm limits. It communicates via a single-bus protocol, requiring only one signal and one ground wire. The temperature measurement range is -55C to +125C, with accuracy exceeding 0.1C between 35C and +45C. It can also operate in parasitic mode, powered directly through the signal line, eliminating the need for an external power supply. Each GX18B20SH has a unique 64-bit serial number, allowing multiple sensors to be networked on the same bus, controlled by a single processor. This networking capability is ideal for HVAC, building and equipment monitoring, grain temperature measurement, industrial temperature sensing, and process monitoring.
Product Attributes
- Brand: GXCAS Technology
- Origin: Not specified
- Material: Not specified
- Color: Not specified
- Certifications: Not specified
Technical Specifications
| Feature | Specification |
|---|---|
| Interface | Single-bus interface, requires one port pin |
| Unique Identifier | Global unique 64-bit serial number per chip |
| Temperature Measurement Range | -55C to +125C (-67F to +257F) |
| Accuracy | 0.1C within 35C to 45C |
| Temperature Resolution | 9-12 bits, selectable |
| Temperature Conversion Speed | <400ms at 12-bit resolution |
| Power Supply Voltage Range | 2.5V to 5.5V (via data line in parasitic mode) |
| Alarm Functionality | User-definable non-volatile temperature alarm settings; Alarm search command identifies devices exceeding set temperatures |
| ESD Protection | HBM 8000V, MM 800V |
| Package | 3-pin TO-92S |
| Operating Modes | External power supply or parasitic power mode |
| Default Power-on State | Temperature register defaults to +85C |
| CRC Generator | CRC = X^8 + X^5 + X^4 + 1 |
| Bus System | Single-wire bus, requires pull-up resistor; idle state is high; reset if bus is low for >480s |
| Memory Structure | Scratchpad (SRAM) and non-volatile EEPROM for TH, TL, and Configuration registers |
| Configuration Register | Bits R0 and R1 set resolution (9-12 bits); default is 12 bits (R0=1, R1=1) |
| Application Scenarios | Thermometers, industrial temperature measurement, HVAC, building/equipment monitoring, grain temperature measurement, process monitoring |
2504101957_GXCAS-GX18B20SH_C516772.pdf
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