DS1302N+

DS1302N+ is a battery-backed real-time clock/calendar (RTC) from the DS1302 family. It keeps time when system power is removed via a VBAT pin and a trickle-charge path for a backup battery. It operates from 2.0 to 5.5 V and uses a 32 kHz crystal for timekeeping. Time data (seconds, minutes, hours, date, day, month, year) are stored in BCD; a CH bit can halt the clock. It also provides 31 bytes of general-purpose RAM. Communication uses a simple 3‑wire serial interface: CE, SCLK, and a bidirectional I/O line. Time registers are read/written with a small sequence of 8‑bit transfers. Typical use: supply Vcc, attach the 32 kHz crystal, enable VBAT for backup, set the time, and read it back as needed. Common applications include clocks, calendars, data logging, and event stamping in microcontroller projects. If you need a specific package or exact feature tweak, check the datasheet for the DS1302/DS1302N+/N+ variant you’re using.

Key features of DS1302N+ (RTC with RAM and backup):
- Real-time clock/calendar: keeps seconds, minutes, hours, date, day, month, year; supports 12/24-hour format; CH bit can halt the oscillator.
- 32.768 kHz crystal input for timekeeping.
- Battery-backed operation: VBAT keeps time when VCC is off; supports external rechargeable battery or supercapacitor.
- Trickle-charge circuit: built-in trickle-charge with resistor network for a secondary battery/supercap.
- 31 x 8-bit battery-backed RAM for data storage.
- Three-wire serial interface: CE, I/O, SCLK (non-I2C/SPI-compatible; simple shift-register protocol).
- SQW/OUT pin: programmable square-wave output (e.g., 1 Hz) or clock/output mode.
- Wide operating voltage: typically 2.0 V to 5.5 V.
- Low-power backup operation and simple, compact 8-pin package (DIP/SOIC variants).
- 8-bit/BCD time registers; year field 00–99; no built‑in temperature sensor; simple programming model.
Note: DS1302N+ is the clock/backup RAM family; exact timings and register map follow the DS1302/DS1302N datasheet.

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

- Pin count: 8 pins (DIP/SOP 8-pin package).
- Main functions/pins:
- VCC: main supply
- GND: ground
- VBAT: battery backup input
- CE: Chip Enable (active high)
- SCLK: Serial clock
- IO: Bidirectional data line (3-wire interface)
- X1/X2: 32.768 kHz crystal oscillator pins
DS1302N+ is a real-time clock/calendar with battery backup and a 3-wire interface (CE, SCLK, IO). It also supports battery-backed RAM.

- Manufacturer: Dallas Semiconductor (the DS1302N+ was by Dallas; the company later became part of Maxim Integrated, which is now under Analog Devices).
- Type of company: a semiconductor company that designs and manufactures integrated circuits (ICs), such as real-time clock ICs.

- Real-time clock for microcontrollers and embedded systems
- Data logging with accurate timestamping
- Digital clocks, alarms, timers and scheduling
- Battery-backed timekeeping during power loss
- IoT, wearables and portable devices
- Telemetry, measurement systems and automation applications