Part 10:Real-Time Clock - Alinx Cyclone IV FPGA User Manual

Figure 9-2: EEPROM on the AX515 FPGA board
EEPROM PIN assignment:
EEPROM_I2C_SDA
EEPROM_I2C_SCL
Part 10:Real-Time Clock DS1302
The FPGA development board contains a real-time clock RTC chip, model
DS1302. Its function is to provide the calendar function to 2099, with days,
minutes, minutes, seconds and weeks. If time is required in the system, the
RTC needs to be designed into the product. He needs to connect a 32.768KHz
passive clock to provide an accurate clock source to the clock chip, so that the
RTC can accurately provide clock information to the product. At the same time,
in order to power off the product, the real-time clock can still run normally.
Generally, a battery is required to supply power to the clock chip. In Figure 8.1,
U7 is the battery holder. We put the button battery (model CR1220, voltage is
3V) into the battery. When the system is powered off, the button battery can also
supply power to the DS1302, so that regardless of whether the product is
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Cyclone IV FPGA Development Board AX515 User Manual
Net Name
Contact Email: rachel.zhou@alinx.com.cn
FPGA PIN
A8
G11