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DS1302

Name: DS1302
Rating: 4.7 (12 reviews)

IC RTC CLK/CALENDAR SER 8DIP

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仕様

Part Status	Obsolete
DigiKey Programmable	Not Verified
Type	Clock/Calendar
Features	Leap Year, NVSRAM, Trickle-Charger
Memory Size	31B
Time Format	HH:MM:SS (12/24 hr)
Date Format	YY-MM-DD-dd
Interface	3-Wire Serial
Voltage - Supply	2V ~ 5.5V
Voltage - Supply, Battery	2V ~ 5.5V
Current - Timekeeping (Max)	0.3µA ~ 1µA @ 2V ~ 5V
Operating Temperature	0°C ~ 70°C
Mounting Type	Through Hole
Package / Case	8-DIP (0.300", 7.62mm)
Supplier Device Package	8-PDIP
Base Product Number	DS1302

概要

Description

The DS1302 is a real-time clock (RTC) chip designed for keeping track of time and date. It communicates via a serial interface, typically using the SPI protocol, allowing microcontrollers to read and set the time. The chip features a battery backup, ensuring it keeps accurate time even during power outages.
Key specifications include:
- Timekeeping accuracy of ±2 minutes per month at 25°C.
- Calendar functions for days, months, years, and leap years.
- A 31-byte RAM for storing additional user data.
- A programmable square wave output for alarms or timing applications.
The DS1302 operates with a supply voltage of 2.0V to 5.5V and can function at low power, making it suitable for battery-operated devices. It is commonly used in various applications, including clocks, timers, and data logging systems, where accurate timekeeping is essential. To interface the DS1302, users typically require a few resistors and a microcontroller or microprocessor to control its operations via the SPI bus.

Features

The DS1302 is a real-time clock (RTC) chip with several key features:
1. Timekeeping: It keeps track of seconds, minutes, hours, day, date, month, and year, including leap year adjustments.
2. Power Supply: Operates on a wide voltage range (2.0V to 5.5V), making it suitable for various applications.
3. Low Power Consumption: Designed for low power usage, it consumes less than 1 µA in battery backup mode, ensuring longevity in portable devices.
4. Serial Communication: Utilizes a simple 3-wire interface (CLK, I/O, CE) for easy communication with microcontrollers.
5. Battery Backup: Supports a backup battery, allowing timekeeping to continue during power outages.
6. Programmable Square Wave: Can output a square wave signal for timing applications, with selectable frequencies.
7. Adjustable Clock Speed: The clock can be adjusted for drift compensation.
These features make the DS1302 suitable for applications like embedded systems, data loggers, and various time-sensitive projects.

Package

The DS1302 is typically available in a 16-pin DIP (Dual In-line Package) format. It may also be found in surface mount packages such as SOIC (Small Outline Integrated Circuit) and TSSOP (Thin Shrink Small Outline Package).

Pinout

The DS1302 is a real-time clock (RTC) integrated circuit with a total of 8 pins. The pinout and functions are as follows:
1. VCC: Power supply (2.0V to 5.5V).
2. GND: Ground connection.
3. SCLK: Serial clock input for data communication.
4. IO: Bidirectional data input/output for serial communication.
5. CE: Chip enable; activates the device for communication.
6. DS: Data input; used to send data to the RTC.
7. RST: Reset pin; resets the device and clears the registers when low.
8. 32KOUT: Outputs a 32.768 kHz square wave for clock purposes.
The DS1302 is typically used for keeping track of real-time data in various electronic applications, such as clocks, timers, and event counters. It features battery backup capability to maintain time during power outages.

Manufacturer

The DS1302 is manufactured by Maxim Integrated, a company that specializes in analog and mixed-signal semiconductors. Founded in 1983, Maxim Integrated designs and provides a wide range of integrated circuits for various applications, including power management, signal processing, and data conversion. The company is well-regarded for its high-performance, innovative solutions and has a strong presence in markets such as automotive, industrial, and communications. In 2021, Maxim Integrated was acquired by Analog Devices, Inc., further expanding their portfolio in the semiconductor industry.

Application

The DS1302 is a real-time clock (RTC) chip used in various applications, including:
1. Embedded Systems: Timekeeping in microcontroller-based projects.
2. Data Logging: Timestamping data in environmental monitoring and scientific experiments.
3. Alarm Systems: Scheduling alarms and reminders.
4. Timers: Managing timing functions in appliances or industrial equipment.
5. Consumer Electronics: Clocks in digital watches, cameras, and home automation devices.
Its low power consumption and easy interfacing make it suitable for battery-operated devices as well.

Equivalent

Equivalent products to the DS1302 chip include the DS1307, DS3231, and MCP7940N. These chips are all real-time clocks (RTCs) with varying features, such as temperature compensation and different power requirements. The DS1307 offers similar functionality without battery backup, while the DS3231 includes integrated temperature compensation for improved accuracy. The MCP7940N also provides battery backup and an integrated EEPROM for storage.