DS1302 Real Time Clock Module (No Battery)
DS1302 is a trickle charge clock chip launched by DALLAS company. It contains a real-time clock/calendar and 31 bytes of static RAM. It communicates with a single-chip microcomputer through a simple serial interface. The real-time clock/calendar circuit provides information on seconds, hours, days, weeks, months, and years. It can automatically adjust the number of days in the month and leap year. The clock operation mode is determined by the AM/PM instruction, which allows for a 24 or 12-hour format.
DS1302 and single-chip microcomputer can use a synchronous serial communication method with only three lines:
(1) RST: reset line
(2) I/O: data line
(3) SCLK: serial clock.
Clock/RAM data can be read or written as a byte character or as a communication of up to 31 bytes. DS1302 has a very low power consumption and can maintain the data and clock information with less than 1mW of power.
Wiring method (to provide procedures, for example, can pick up any IO port, in the procedure to modify the port definitions :
VCC: 5V/3.3V
GND: GND
CLK: P02
DAT: P01
RST: P00
Note:
1.VCC and GND do not reverse, so as not to burn the chip
2.51 SCM P0 port to receive a pull-up resistor, if your computer is not connected pull-up resistor, the data can be the string to the other port.
Features:
- The real-time clock counts minutes, seconds, date, hours, month day of the week, year and leap-year compensation up to 2100.
- 318 temporary data storage RAM
- Working current of 2.0V, less than 300nA
- Read / Write clock or RAM data with two kinds of mode of single-byte transfer mode and multi-byte character set
- 8 pin DIP package or optional 8 pin SOIC package based on the surface assembly
- Simple 3 wire interface
- Compatible with TTL Vcc=5V
- Double power supply pipe for main power and backup power supply.
Specification:
| Material | Plastic, Metal |
|---|---|
| Operating Voltage Range | 2.0V – 5.0V |
| Operating Currency | Less than 300nA at 2.0V |
| Woring Temprature Range | 0C-85C |
| Mount Hole Dia | 3.1mm / 0.12″ |
| Crystal Oscillator Frequency | 32.768K |
| Length (mm): | 44 |
| Width (mm) | 23 |
| Height (mm) | 1.6 |
| Weight (g): | 6 |
| Shipping Weight | 0.01 kg |
| Shipping Dimensions | 5 × 3 × 2 cm |
Package Includes:
1 x DS1302 RTC Real Time Clock Module (No Battery)
DS1302 Real Time Clock Module Overview
The DS1302 Real Time Clock Module (No Battery) houses the DS1302 trickle-charge clock chip, offering a full real-time clock/calendar and 31 bytes of static RAM. It communicates via a simple three-wire serial interface (RST, I/O, SCLK) and delivers seconds, minutes, hours, day, date, month, and year data, automatically handling month lengths and leap years.
Key Features of DS1302 Real Time Clock Module
- Real-time clock/calendar: tracks seconds, minutes, hours, day, date, month, and year
- 31 bytes of static RAM for user data storage
- Simple three-wire serial interface (RST, I/O, SCLK) for easy microcontroller integration
- Selectable 12-hour (AM/PM) or 24-hour timekeeping mode
- Automatic adjustment for month lengths and leap years
- Module ships without a backup battery—install your own CR2032 cell for power-fail protection
- Genuine DS1302 chip—fast shipping from Zbotic
Applications and Use Cases
- Microcontroller-based data loggers requiring accurate timestamps
- Real-time clocks in embedded display projects
- Home automation systems for scheduled events
- Alarm clock or timer applications
- Power-failure backup timekeeping when battery is installed
- Timestamping sensor measurements for IoT prototypes
How to Use DS1302 Real Time Clock Module
Begin by wiring VCC to your 5V supply (or within 2–5.5V range), GND to ground, RST to your microcontroller’s reset/data pin, I/O to the data pin, and SCLK to a clock line. In your code, implement simple bit-banged routines to write and read time registers in byte format. For continuous timekeeping during power loss, solder in a CR2032 coin cell into the onboard battery holder.
Why Buy from Zbotic?
- Genuine Products: All items sourced from authorized distributors
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- Easy Returns: Hassle-free replacement for defective products
Frequently Asked Questions
Q: Does this module include a backup battery?
No. The “No Battery” version does not ship with a coin cell. To enable battery backup, install a CR2032 battery in the onboard holder.
Q: Which voltage levels does the DS1302 support?
The DS1302 operates from 2.0V to 5.5V. For most Arduino and 5V systems, connect VCC to 5V. It may also work at 3.3V but ensure signal compatibility.
Q: Will the DS1302 auto-adjust for leap years?
Yes. The DS1302’s internal calendar automatically accounts for different month lengths and leap years, so no manual adjustment is needed at February 29.
Technical Specifications
| Model | DS1302 |
|---|---|
| SKU | AI2733 |
| Weight | 0.00845 kg |
| Availability | In Stock |
Applications & Use Cases
The DS1302 Real Time Clock Module (No Battery) is a versatile rtc module used across a wide range of applications including electronics projects, DIY builds, prototyping, and educational experiments.
Common use cases:
- Integrating into a custom electronics project
- Learning and experimenting with circuits
- Replacing or upgrading components in existing setups
This product is ideal for electronics enthusiasts, engineers, and students.
Technical Tip: Always verify voltage and current requirements before connecting to your circuit. Check datasheets for detailed specifications and pin configurations.
Shipping & Delivery
- Free shipping on orders above ₹999 across India
- Dispatched within 1-3 business days
- Expected delivery: 3-7 business days depending on location
- Secure packaging to ensure safe transit of electronic components
