Details

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BUY DS2490S https://www.utsource.net/itm/p/6465603.html
IC BRIDGE CLIP USB TO 1-W 24SOIC

Parameter	Description	Value/Range
Part Number	Digital Thermometer and Thermostat with 1-Wire Interface	DS2490S
Package	Package Type	28-Pin SSOP (7x7mm)
Operating Voltage	Supply Voltage Range	3.0V to 5.5V
Operating Temperature	Temperature Range for Operation	-40°C to +85°C
1-Wire Bus	Communication Protocol	1-Wire
Resolution	Temperature Measurement Resolution	9-bit to 12-bit
Accuracy	Temperature Measurement Accuracy	±0.5°C from -10°C to +85°C
Conversion Time	Time to Convert Temperature Reading at 12-bit Resolution	750ms
Programmable Alarm	User-Settable High and Low Temperature Limits	Yes
Non-Volatile Memory	EEPROM for Storing Configuration Data	8 bytes
Supply Current	Active Mode Current Consumption	1.5mA (max)
Standby Current	Quiescent Current Consumption	1.0μA (max)
Parasite Power	Operation on Parasite Power	Supported
ESD Protection	Electrostatic Discharge Protection	±8kV (Human Body Model)

Instructions for Use

1. Power Supply:

   • Connect VCC to a power supply between 3.0V and 5.5V.
   • Ground the GND pin.

2. 1-Wire Bus Connection:

   • Connect the 1-Wire data line (DQ) to a digital I/O pin on your microcontroller or host system.
   • Ensure the 1-Wire bus is pulled up to VCC with a 4.7kΩ resistor.

3. Initialization:

   • Send a reset pulse on the 1-Wire bus to initialize communication.
   • The DS2490S will respond with a presence pulse.

4. ROM Commands:

   • Use ROM commands to identify and select specific devices on the 1-Wire bus.
   • Common ROM commands include Read ROM, Match ROM, Skip ROM, and Search ROM.

5. Function Commands:

   • After selecting the DS2490S, send function commands to perform temperature conversions, read temperature data, and configure the device.
   • Example function commands include Convert T to start a temperature conversion, Read Scratchpad to read temperature data, and Write Scratchpad to set configuration parameters.

6. Temperature Conversion:

   • Send the Convert T command to initiate a temperature conversion.
   • Wait for the conversion time based on the selected resolution (e.g., 750ms for 12-bit).

7. Reading Temperature:

   • After the conversion is complete, use the Read Scratchpad command to read the temperature data from the scratchpad.
   • The temperature is stored in two bytes (LSB and MSB) in the scratchpad.

8. Setting Alarms:

   • Use the Write Scratchpad command to set the high and low temperature limits in the scratchpad.
   • These limits can be used to trigger an alarm when the temperature exceeds the set range.

9. EEPROM Configuration:

   • Use the Copy Scratchpad command to copy the configuration data from the scratchpad to the EEPROM for non-volatile storage.
   • This ensures that the configuration is retained even when power is removed.

10. Parasite Power Operation:

    • If using parasite power, ensure the 1-Wire bus is capable of providing sufficient power during active operations.
    • The DS2490S can operate in parasite power mode by connecting VCC to the 1-Wire data line (DQ).

11. Power Down:

    • To put the DS2490S into a low-power standby mode, send the Write Scratchpad command with the configuration register set to disable the temperature conversion.
    • The device will consume minimal current in this state.

By following these instructions, you can effectively integrate the DS2490S into your 1-Wire temperature sensing applications.

(For reference only)