Details

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BUY DS1302SN https://www.utsource.net/itm/p/1101022.html
Trickle Charge Timekeeping Chip

Parameter	Symbol	Conditions	Min	Typ	Max	Unit
Supply Voltage	Vcc	Operating	2.5	-	5.5	V
Standby Current	ICCS	VCC = 3V	-	0.5	-	μA
Active Current	ICCA	VCC = 3V, 32kHz load	-	280	-	μA
Clock Output Frequency	fCLKO	-	1	-	32	kHz
Output Drive Capability	IOL	VCC = 3V, VOL = 0.4V	-	5	-	mA
Output High Level	VOH	VCC = 3V, IOH = -1mA	-	2.4	-	V
Output Low Level	VOL	VCC = 3V, IOL = 5mA	-	0.4	-	V
Data Input/Output Current	IIO	VIH = 2.0V, VIL = 0.8V	-	1	-	mA
Temperature Range	Toper	Industrial	-40	-	85	°C

Instructions for Using the DS1302SN

1. Power Supply:

   • Ensure the supply voltage (Vcc) is within the range of 2.5V to 5.5V.
   • The device operates with a low standby current of 0.5μA at 3V.

2. Clock Output:

   • The clock output frequency can be set to either 1Hz or 32kHz.
   • Use the appropriate control bits in the register to configure the clock output.

3. Data Communication:

   • The DS1302SN uses a 3-wire serial interface (CE, I/O, SCLK).
   • CE (Chip Enable) must be high to enable communication.
   • SCLK (Serial Clock) is used to synchronize data transfer.
   • I/O (Data Input/Output) is used for bidirectional data transfer.

4. Register Operations:

   • The DS1302SN has several registers for timekeeping and control.
   • Write to the registers to set the time, date, and other parameters.
   • Read from the registers to retrieve the current time, date, and status.

5. Time and Date Setting:

   • Set the time and date by writing to the corresponding registers.
   • The registers are BCD (Binary-Coded Decimal) format.

6. Power Fail Detection:

   • The device has a built-in power fail detect pin (Vpp).
   • Connect Vpp to a higher voltage than Vcc to enable the power fail detection feature.

7. Battery Backup:

   • Use a backup battery to maintain the time and date when the main power is off.
   • The device can operate on a 3V coin cell battery.

8. Temperature Considerations:

   • The operating temperature range is from -40°C to +85°C.
   • Ensure the device is used within this range to avoid performance issues.

9. Handling and Storage:

   • Handle the device with care to avoid static damage.
   • Store in a dry, cool place to prevent moisture damage.

10. Testing and Debugging:

    • Use a multimeter to check the supply voltage and output levels.
    • Verify the clock output using an oscilloscope.
    • Test the communication by reading and writing to the registers.

By following these instructions, you can effectively use the DS1302SN for accurate timekeeping and data management in your projects.

(For reference only)