DS3231 high-precision clock module (C5B2)

DS3231 is a low-cost, high-precision I2C real-time clock (RTC), with an integrated temperature-compensated crystal oscillator (TCXO) and crystal. The device includes a battery input terminal, which can maintain accurate timing when the main power supply is disconnected. The integrated crystal oscillator improves the long-term accuracy of the device and reduces the number of components in the production line. DS3231 offers commercial grade and industrial grade temperature range, adopts 16-pin 300mil SO package.RTC saves seconds, minutes, hours, day of the week, date, month and year information. For months with less than 31 days, the date at the end of the month will be automatically adjusted, including corrections for leap years. The working format of the clock can be 24-hour or 12-hour format with /AM/PM indication. Provides two configurable calendar alarms and a configurable square wave output. Address and data are serially transmitted via I2C bidirectional bus.A precise, temperature-compensated voltage reference and comparator circuit is used to monitor the VCC status, detect power failures, provide a reset output, and automatically switch to a backup power supply when necessary. In addition, the /RST monitor pin can be used as a manual input to generate a μP reset.In addition to high timing accuracy, DS3231 also has some other functions, which expand the additional functions and selection range of the system host. The device integrates a very accurate digital temperature sensor, which can be accessed through the I2C* interface (as time). The accuracy of this temperature sensor is ±3°C. The on-chip control circuit can realize automatic power detection and manage the power switch between the main power supply and the backup power supply (ie, low-voltage battery). If the main power supply fails, the device can continue to provide accurate timing and temperature, and its performance will not be affected. When the main power supply is re-energized or the voltage value returns to the allowable range, the on-chip reset function can be used to restart the system microprocessor.

Module parameters:

1. Working voltage: 3.3--5.5V2. Clock chip: high-precision clock chip DS32313. Clock accuracy: within the range of 0-40℃, the accuracy is 2ppm, and the annual error is about 1 minute4. With 2 calendar alarm clocks5. Programmable square wave output6. The real-time clock generates seconds, minutes, hours, day of the week, date, month and year, and provides leap year compensation with a valid period of up to 21007. The chip has its own temperature sensor with an accuracy of ±3℃8. Memory chip: AT24C32 (storage capacity 32K)9.IIC bus interface, the highest transmission speed is 400KHz (when the working voltage is 5V)10. Other IIC devices can be cascaded, the 24C32 address can be modified by short-circuiting A0/A1/A2, the default address is 0x5711.With CR2032 battery12.Packing method: single anti-static packagingWiring instructions (take Arduino uno r3 as an example):SCL→A5SDA→A4VCC→5VGND→GND

Product introduction

DS1302 is a trickle charge clock chip launched by DALLAS.It contains a real-time clock/calendar and 31 bytes of static RAM,It communicates with the microcontroller through a simple serial interface.The real-time clock/calendar circuit provides information of seconds, minutes, hours, days, weeks, months, and years,The number of days in a month and the number of days in a leap year can be adjusted automatically.The clock operation can be decided to adopt 24 or 12 hour format through AM/PM indication.The DS1302 and the microcontroller can simply communicate in a synchronous serial way,Only three ports are needed: (1) RST reset (2) I/O data line (3) SCLK serial clock.The read/write data of the clock/RAM is communicated in a byte or burst of up to 31 bytes.The DS1302 has very low power consumption when working, and the power is less than 1mW while maintaining data and clock information

Main performance indicators of DS1302:★ The real-time clock has the ability to calculate seconds, minutes, hours, days, weeks, months, and years before 2100, as well as the ability to adjust leap years★ 31 8-bit temporary data storage RAM★ Serial I/O port mode minimizes the number of pins★ Wide range of working voltage 2.0 5.5V★ When the working current is 2.0V, less than 300nA★ There are two transmission methods when reading/writing clock or RAM data, single-byte transmission and multi-byte transmission character group method★ 8-pin DIP package or optional 8-pin SOIC package according to surface assembly★ Simple 3-wire interface★ Compatible with TTL Vcc=5V★ Optional industrial temperature range -40 +85★ Dual power tubes are used for main power supply and backup power supply

Wiring method (take the provided program as an example, you can connect to any IO port, just modify the port definition in the program):

VCC→+5V/3.3V

GND→GND

CLK→P02

DAT→P01

RST→P00

DS1307 I2C real-time clock chip (RTC):24C32 32K I2C EEPROM memory

Solve the problem that DS1307 cannot read or write with backup battery.After fully charged, it can provide DS1307 timekeeping for 1 year.Small design, 27mm*28mm*8.4mmLead out the clock pin of DS1307 to provide a clock signal for the microcontroller.Other I2C devices can be cascaded.