Product Overview
The HT18B20A is a programmable resolution 1-Wire digital thermometer compatible with the DS18B20. It offers 9-bit to 12-bit Celsius temperature measurements with a user-programmable alarm function for nonvolatile upper and lower trigger points. Communication is established over a single data line (1-Wire bus), and the device can derive power directly from this line ("parasite power"), eliminating the need for an external power supply. Each HT18B20A features a unique 64-bit serial code, enabling multiple devices on the same bus for distributed temperature monitoring in applications such as HVAC, building environmental controls, equipment monitoring, and process control systems.
Product Attributes
- Brand: Not specified
- Origin: Not specified
- Material: Not specified
- Color: Not specified
- Certifications: Not specified
Technical Specifications
| Parameter | Symbol | Min | Max | Unit | Notes |
|---|---|---|---|---|---|
| Supply voltage (from power supply element) | UDD | -0.5 | 6.0 | V | |
| Ambient temperature | Ta | -60 | 125 | C | |
| Supply voltage | UDD | 3.0 | 5.5 | V | |
| Supply voltage (on external pull-up resistor) in supply mode on DQ (UDD = 0 V) | UPU | 3.0 | 5.5 | V | 1, 2 |
| Low level input voltage at UDD = 5 V | UIL | -0.3 | 0.8 | V | 1, 3 |
| Low level input voltage at UDD = 3 V | UIL | -0.3 | 0.5 | V | 1, 2, 3 |
| High level input voltage in supply mode on VDD pin | UIH | 2.2 | UDD+0.3 | V | 1, 4 |
| High level input voltage in supply mode on DQ (UDD = 0 V) | UIH | 3.0 | UDD+0.3 | V | 1, 2, 4 |
| Cycle time of EEPROM record | tWR | - | 10 | ms | 2 |
| Operating ambient temperature | Ta | -55 | 125 | C | - |
| Consumption current | IDD | - | 1.0 | A | 251 C; 0.4 V UI 0.4 V or 1.1 UI UDD-0.3 V |
| Dynamic Consumption current | IODD | - | 1500 | A | 251 C; UDD = 5 V |
| Low level output current | IOL | - | 4.0 | mA | at UO = 0.4 V |
| Input current (Line driver off, on DQ pin) | IDQ | - | 5 | A | 2510 C; UDD = 5 V |
| Consumption current | IDD | - | 0.75 | A | 2510 C; 0 V UI 0.4 V or 0.75 UI UDD-0.3 V |
| Temperature measurement drift | T | 0.2 | - | C | After 1000 hours at 125 C; UDD = 5.5 V |
| Temperature measurement error | tERR | 0.5 | - | C | 0 to 85 C |
| Temperature measurement error | tERR | 2.0 | - | C | -55 to 125 C |
2409291004_HTCSEMI-HT18B20ATZ_C2834477.pdf
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