his is an HW-689 PCF8563 Real-time Clock RTC module. It has a variety of functions, including an external programmable clock output, an alarm, a timer, features, external quartz, and a backup battery.
The PCF8563 RTC Board provides a real-time clock function that is powered by an
onboard battery and operates independently even when the MCU is turned off. I2C real-time clock (RTC) is less expensive and more precise than the DS1302 or DS1307.
 
Features
- High Accuracy
 
- Low Power Consumption
 
- Can be interfaced with Arduino
 
- Low Cost
 
- I2C Real Time Clock (RTC)
 
Pinout:
- 
 Pin-1: INT
 
-  Pin-2: COT
 
-  Pin-3: SCL
 
-  Pin-4: SDA
 
-  Pin-5: GND
 
-  Pin-6: VCC
 
SPECIFICATIONS
| Model | 
HW-689  | 
| Type | 
Real-time Clock RTC Module | 
| Using Inbuilt IC  | 
PCF8563 | 
| Size | 
43*17mm 
 | 
| No of Pins | 
06 | 
| Voltage Range | 
1 - 5.5V | 
| Interface | 
I2C |