DS1302N+

DS1302N+ is a Dallas/Maxim Real‑Time Clock (RTC) with calendar, battery‑backed RAM, and a 32 kHz time base. It uses a simple 3‑wire serial interface (CE, CLK, IO) that’s SPI‑like, but not I2C. It runs from 2.0–5.5 V and can retain time when power is removed via a backup supply (battery). Key features: time/date/calendar registers, 31 bytes of battery‑backed RAM, optional trickle‑charge circuit, and a 32 kHz output. It requires an external 32.768 kHz crystal for accurate timekeeping. Typical uses include clocks in microcontroller projects, data logging, and timed events. Programming is done by sending read/write commands to the RTC registers to set or read the time, date, and RAM. The DS1302N+ is widely supported with libraries for Arduino, ESP32, Raspberry Pi, and other MCUs.

Here are the DS1302N+ features (concise):
- Real-time clock/calendar: tracks seconds, minutes, hours (12/24-hr), date, month, day, year; leap-year aware.
- 31 bytes of general-purpose RAM for user data.
- Battery-backed operation with a separate VBAT and automatic switchover; supports trickle-charge for a rechargeable battery or supercapacitor.
- 3-wire SPI-like serial interface (CE, I/O, SCLK) for random and burst read/write to RTC registers and RAM.
- Programmable SQW/OUT square-wave/interrupt output for timing signals.
- Write-protect option for RTC and RAM to prevent accidental writes.
- Wide supply range with low power consumption; timekeeping continues when main power is removed.
- Available in common packages (DIP8/SOIC8) for easy integration.

- Pin count: 8 pins (DIP8/SO8 package).
- Typical pinout: 1 CE, 2 IO, 3 SCLK, 4 GND, 5 VCC, 6 VBAT, 7 X1, 8 X2.
- Function: Real-Time Clock (RTC) with 3-wire serial interface (CE, CLK, IO), time/date registers plus 31-byte NV RAM, uses external 32.768 kHz crystal on X1/X2, and supports battery backup via VBAT (with optional trickle-charge).

- Manufacturer: Dallas Semiconductor (DS1302N+).
- What kind of company: A United States–based semiconductor company that designs and manufactures integrated circuits; now part of Maxim Integrated (and Analog Devices).

DS1302N+ is a low‑power, battery‑backed real‑time clock with RAM and a 3‑wire interface. Common application areas include:
- Real‑time clock for microcontrollers, SBCs, and embedded systems
- Time stamping and data logging for sensors, data loggers, and meters
- Scheduling, alarms, and periodic control in automation and smart home devices
- Power‑failure‑safe timekeeping and event logging
- Digital clocks/display modules and time signaling for IoT/wearables
These use cases leverage accurate timekeeping, small footprint, and easy integration.

DS1302N+ is an 8-pin device, typically offered in DIP-8 or SO-8 (SOP-8) packages, depending on the vendor.