DS1620 Digital Thermometer and Thermostat DIP-8 (DS1620 IC)
The DS1620 is a highly integrated digital thermometer and thermostat that provides 9-bit temperature readings without requiring external components. Housed in a standard 8-pin DIP package, it measures temperatures from -55°C to +125°C with a high degree of accuracy. The device features three thermal alarm outputs, allowing it to function as a standalone thermostat. Because the high and low temperature trip points are stored in nonvolatile memory, the IC can be programmed once and then used in standalone mode without a continuous connection to a microcontroller.
Originally developed by Dallas Semiconductor and now part of the Maxim Integrated (Analog Devices) portfolio, this IC is a versatile solution for industrial systems and consumer products. It is a popular choice for electronics projects in India for building DIY temperature controllers, digital thermometers, and automated cooling systems that require a simple 3-wire serial interface (CLK, DQ, RST) and reliable performance in a through-hole format.
Key Features
- Standalone Thermostat: Three thermally triggered outputs (THIGH, TLOW, TCOM) for direct device control.
- Nonvolatile Memory: User-defined temperature settings are retained even without power.
- 9-Bit Digital Output: High-resolution readings provided in 0.5°C increments.
- No External Parts: Fully self-contained sensor and digital converter.
- Wide Voltage Range: Operates efficiently on a supply of 2.7V to 5.5V.
- 3-Wire Interface: Uses a minimal pin count for communication with microprocessors.
- Fast Conversion: Converts temperature to a digital word in 750ms (typical).
Specifications
- IC Type: Digital Thermometer and Thermostat
- Temperature Range: -55°C to +125°C (-67°F to +257°F)
- Resolution: 9-bit (0.5°C steps)
- Accuracy: ±0.5°C (from 0°C to +70°C)
- Supply Voltage (VDD): 2.7V to 5.5V
- Communication: 3-wire Serial (CLK, DQ, RST)
- Conversion Time: 750ms to 1.0 second (Max)
- Package Type: PDIP-8
- Mounting Type: Through-Hole
- Operating Temperature: -55°C to +125°C
Interfaces
- Pin 1 (DQ): Data Input/Output for 3-wire communication
- Pin 2 (CLK/CONV): Serial Clock Input or Standalone Convert pin
- Pin 3 (RST): Reset Input (Active High)
- Pin 4 (GND): Ground
- Pin 5 (TCOM): Combination Trigger (High if T >= TH; Low if T < TL)
- Pin 6 (TLOW): Low Temperature Trigger (High if T <= TL)
- Pin 7 (THIGH): High Temperature Trigger (High if T >= TH)
- Pin 8 (VDD): Positive Supply Voltage (+5V typical)
