DS1302N+

DS1302N+ is an RTC (real-time clock) IC with battery backup, used to keep time even when main power is off. It’s the 3-wire version of the DS1302 family.
Key features
- Timekeeping: seconds, minutes, hours, date, month, day-of-week, year (usually in BCD).
- RAM: 31 bytes of general-purpose battery-backed RAM.
- Battery backup and trickle charger for a backup cell (coin cell or rechargeable battery).
- 32.768 kHz crystal input for accurate timebase.
- Simple 3-wire serial interface: CE, CLK, IO (not I2C or SPI).
- Operating supply typically 2.0–5.5 V.
Interface basics
- Access time registers and RAM via addressable read/write over IO.
- Burst mode lets you read multiple registers quickly.
- Pinout commonly includes VCC, GND, VBAT, CE, CLK, IO, X1, X2 (crystal pins).
Common use cases
- Microcontroller-based clocks, time stamps, data loggers, embedded systems needing persistent timekeeping.
Notes
- Not I2C/SPI; requires external 32 kHz crystal and a backup power path.
- DS1302N+ variants mainly differ by packaging/grade; verify datasheet for exact specs.

DS1302N+ is a serial real-time clock/calendar with battery-backed RAM. Key features:
- Timekeeping: seconds, minutes, hours (12/24‑hour), day of week, date, month, year; leap-year compensation up to 2100.
- Timebase: 32.768 kHz crystal input for accurate clock.
- Serial interface: 3‑wire (CE, SCLK, I/O) with random access to time registers and 31 bytes of battery‑backed RAM.
- Battery backup: VBAT pin plus trickle-charge circuit to maintain time and RAM when VCC is off.
- Square‑wave output: programmable SQW/interrupt output on the I/O line with selectable frequencies.
- Power range: operates from 2.0 V to 5.5 V; designed for low power.
- Packaging: small 8‑pin package; suitable for embedded systems.
Optional/variant notes (datasheet dependent): industrial temperature variants and specific RAM sizes may vary by package/lot.

DS1302N+ is packaged in an 8-pin DIP (DIP-8) plastic package.

8 pins. It’s a serial real-time clock with battery backup and a 32.768 kHz crystal. Pin functions (typical DS1302N+ pinout):
- VCC: main supply
- GND: ground
- VBAT: battery backup input
- X1, X2: crystal oscillator connections
- CE: chip enable (active for 3-wire interface)
- SCLK: serial clock
- IO: bidirectional data line for time registers and RAM
Allows access to timekeeping registers (and battery-backed RAM) over a 3-wire interface (CE, SCLK, IO).

- Manufacturer: Dallas Semiconductor (the DS1302N+ RTC). Dallas Semiconductor was acquired by Maxim Integrated, and today the line is under Analog Devices through its semiconductor business.
- What kind of company: A semiconductor company that designs and manufactures integrated circuits (ICs), especially analog/digital ICs such as real-time clocks.

DS1302N+ provides a low-power real-time clock with 32 kHz crystal, battery backup and RAM. Common applications:
- Real-time clock/calendar in microcontrollers
- Data logging and timestamping (environmental, energy, industrial)
- Alarm, timer, and wake-up functions for embedded systems
- Battery-backed timekeeping for clocks and wearables
- Home/industrial automation time stamping and scheduling
- Event logging in security/sensor systems
- MCU projects (Arduino, STM32, PIC, etc.) needing RTC.