Rtc - Alinx AX301 User Manual

AX301 User Manual
lost. This kind of chip is simple to operate and has a very high price/performance ratio.
Therefore, although the capacity ratio is high, the price is very low, which is a good choice
for products that require high costs. Figure 7-1 shows the EEPROM schematic.
Figure 7-1
EEPROM pin assignment:
Signal Name Pin
SDA E6
SCL D1

8. RTC

The board contains a real-time clock RTC chip, model DS1302, whose function is to
provide calendar functions up to 2099. There are days, minutes, seconds and weeks. If the
system requires time, RTC needs to be involved in the product. He needs a 32.768KHz
passive clock externally to provide an accurate clock source to the clock chip so that RTC
can accurately provide clock information to the product. At the same time, in order to
power down the product, the real-time clock can still operate normally. Generally, a battery
is needed to power the clock chip. In figure 9-1, U10 is the battery holder. After we put the
button battery (model CR1220, voltage is 3V) into the battery, When the system loses the
battery, the button battery can also supply power to the DS1302. In this way, regardless of
whether the product is powered or not, the DS1302 will operate normally and will not be
interrupted, providing continuous time information. Figure 8-1 shows the DS1302
schematic.
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