MR-MINI-RTC is a Real Time Clock (RTC) board. It display time base such as clock, timer, and calendar. Moreover, it can be a counter for an external clock. The data can be interface via I2C bus. There are no external components required. This makes it perfect for embedded systems that need RTC. The board is small can compact in size 2.20 x 1.70 inches.
There are two modes of operation RTC mode and counter mode. When using RTC mode, there is a variable capacitor for frequency crystal adjustment. This makes crystal create correct frequency result in accurate time base. There is a on-board battery backup when there is no power apply to the board. This enable RTC to run continuously even without power supply. When using counter mode (CNT), user can input pulse signal from external generated source via a header pin. Moreover, there is an on-board push button switch so user can generate the pulse to test or experiment with this feature.
The MR-MINI-RTC is designed base on LM2575-5 IC. It is a clock/calendar circuit based on a 2048-bit static CMOS RAM organized as 256 words by 8 bits. Addresses and data are transferred serially via the two-line bidirectional I2C bus. The built-in word address register is incremented automatically after each written or read data byte.
Please take a look at PCF8583 datasheet for more information.
• I2C bus interface operating supply voltage: 2.5V to 6V
• Clock function with four year calendar
• 24 or 12 hour format
• Thermal shutdown and current limit protection
• On-board variable capacitor for frequency adjustment
• Jumpers setting configuration
• Small and compact in size
• Four mounting holes on each corner
• Male and female output headers
For more information please see:
MR-MINI-RTC User Manual