DS1302S+

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DS1302S+

IC RTC CLK/CALENDAR SER 8-SOIC

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  • Fr. Teil #DS1302S+
  • Paket SOP8
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Spezifikationen

Package Tape & Reel (TR),Cut Tape (CT)
ProductStatus Active
Type Clock/Calendar
Features Alarm, Leap Year
TimeFormat HH:MM:SS (12/24 hr)
DateFormat YY-MM-DD-dd
Interface I²C, 2-Wire Serial
Voltage-Supply 1.3V ~ 5.5V
Current-Timekeeping(Max) 14µA ~ 30µA @ 3V ~ 5V
OperatingTemperature -40°C ~ 85°C
MountingType Surface Mount
Package/Case 8-SMD, Flat Lead
MemorySize 1B
Voltage-SupplyBattery 1.6V ~ 3.6V
Series Automotive, AEC-Q200

Übersicht

Description

DS1302S+ is a small, battery-backed real-time clock (RTC) with its own timekeeping registers and a simple 3‑wire serial interface. Key points:
- Timekeeping: tracks seconds, minutes, hours, day, date, month, year (usually in BCD) with 24‑hour format and leap-year handling.
- Clock source: requires a 32.768 kHz crystal connected to X1/X2 for the timebase.
- Interface: uses a three-wire serial bus (CE, SCLK, IO) that is bidirectional on IO; not an I2C or SPI bus.
- Backup power: includes a trickle‑charge circuit to maintain time when main power is off; 2–5.5 V operation.
- RAM: provides up to about 31 bytes of battery-backed RAM for user data.
- Pins: VCC, GND, CE, SCLK, IO, X1, X2 (for the crystal).
- Use: initialize and set the time, then read time periodically; access registers with 8‑bit addressing.
Pros: simple interface, compact, affordable for hobby and embedded projects. Limitations: requires external crystal and backup hardware; less precise than high-end RTCs.

Features

Here are the key features of DS1302S+ (RTC with RAM and trickle-charge):
- Real-time clock and calendar: seconds, minutes, hours (12/24h), day, date, month, year; leap-year aware; BCD time format.
- Battery-backed operation: keeps time when main power is removed.
- Trickle-charge circuit: supports backup battery charging (selectable resistor network for NiCd/NiMH or similar cells).
- 32.768 kHz crystal input: external oscillator for accurate timekeeping.
- 3-wire serial interface: CE (chip enable), CLK, IO (bidirectional data) for register/RAM access (non-I2C protocol).
- Non-volatile RAM: about 31 bytes of user RAM accessible via the IO line.
- Wide supply range: 2.0 V to 5.5 V; low power in battery mode.
- Temperature range: suitable for industrial use (typical operating range around -40°C to +85°C).
- Package options: 8-pin DIP/SOIC for easy mounting.
Optional notes: time/date registers are written/read via the IO line; 12/24-hour mode selectable; memory and timekeeping are separate from main CPU power.

Package

DS1302S+ uses an 8-pin package. Available options are DIP-8 (through-hole) and SOIC-8/SOP-8 (surface-mount).

Pinout

- Pin count: 8 pins (DIP-8/SO-8 package).
- Function: Serial real-time clock (RTC) with calendar, 31-byte RAM, and battery backup. Provides timekeeping with a 3-wire serial interface (CE, I/O, SCLK), a SQW/1 Hz output option, and a trickle-charge path for the backup supply.

Manufacturer

The DS1302S+ is a Dallas/Maxim part—the DS1302 real-time clock originally manufactured by Dallas Semiconductor and later by Maxim Integrated; today the line is under Analog Devices after Maxim’s acquisition.
Analog Devices (the merged company) is a global semiconductor company that designs and manufactures analog, mixed-signal, and digital ICs.

Application

DS1302S+ is a serial real-time clock with battery-backed RAM and trickle-charge. Typical applications:
- Embedded systems needing accurate timekeeping and time-stamping
- Data loggers and event timers
- Digital clocks and display modules
- Alarm/timer-controlled automation (home, industrial, HVAC)
- Power-fail safe clocks for meters and instruments
- Sensor data storage and configuration retention during power loss
- Low-power wearable devices with RTC

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