Details

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Parameter	Description	Units/Notes
Supply Voltage (VCC)	Operating voltage range	2.7 V to 5.5 V
Temperature Range	Temperature measurement range	-55°C to +125°C
Resolution	Configurable temperature resolution	9-bit to 12-bit
Conversion Time	Time required for a temperature conversion	750 ms
Interface	Communication interface type	Two-wire (I2C compatible)
Address Pins	Number of address pins allowing multiple devices on the same bus	3
Power Consumption	Active mode power consumption	40 μA at 3 V, 3 samples per sec
Shutdown Mode	Current consumption in shutdown mode	0.5 μA
Alarm Function	Programmable high and low temperature limits with interrupt output	Yes
Package Type	Available package	SO-8

Instructions for Using DS1621:

1. Power Supply Connection:

   • Connect VCC to a supply voltage between 2.7 V and 5.5 V.
   • Connect GND to ground.

2. Interface Configuration:

   • The DS1621 uses a two-wire interface (TWI) which is I2C compatible.
   • Connect SDA (data line) and SCL (clock line) to your microcontroller or system controller.

3. Address Setting:

   • Use the three address pins (A0, A1, A2) to set a unique address if multiple DS1621 devices are used on the same bus. Each pin can be connected to either VCC or GND to set the address bits.

4. Temperature Conversion:

   • Initiate a temperature conversion by sending a command over the TWI interface.
   • Wait for the conversion time (up to 750 ms for a 12-bit conversion).

5. Reading Temperature:

   • After conversion, read the temperature data from the device using the appropriate register read commands.

6. Setting Temperature Limits:

   • Program the TH (high temperature limit) and TL (low temperature limit) registers to set alarm thresholds.
   • The device will assert an interrupt when the temperature crosses these limits.

7. Shutdown Mode:

   • To reduce power consumption, put the device into shutdown mode by writing to the configuration register. This reduces current consumption to 0.5 μA.

8. Resolution Adjustment:

   • Adjust the temperature resolution from 9-bit to 12-bit by modifying the configuration register settings.

9. Package Handling:

   • Ensure proper handling of the SO-8 package to avoid damage. Follow standard ESD precautions.

These instructions provide a basic setup and operation guide for the DS1621 digital thermometer. For detailed programming and more advanced features, refer to the datasheet provided by Maxim Integrated.

(For reference only)