產品說明0
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原廠 Wio LTE EU 擴展板 v1.3 兼容4G, GNSS, Espruino (102991022)
Description
The Pi RTC is based on the clock chip DS1307, it can provide a real-time clock(RTC) for raspberry pi via the I2C interface. Real-time clock of this module counts seconds,minutes, hours, date of the month,month, day of the week, and year with leap-year compensation valid up to 2100. The clock operates in either the 24-hour or 12-hour format with AM/PM indicator. If you want to keep this module timing when the Raspberry Pi is powered off, you need to put a 3-Volt CR1225 lithium cell in the battery-holder.
Note : The battery is not included.
注意 : 電池不包括在內。
參考影片: https://youtu.be/SKJ9iXhx0mc
Feature
- Support Raspberry Pi 2/ 3 B/B+ Zero
- Suport seconds,minuutes,hours,day of week,month, year
- Support 24-hour or 12-hour format with AM/PM indicator
- 56-byte, battery-backed, nonvolatile (NV) RAM for data storage
- Programmable squarewave output signal
- Automatic power-fail detect and switch circuitry
Typical applications
- Applications need Real Time on Raspberry.
Pin Out
注意 : 此模塊中不使用RX / TX，但5x2接頭佔用了Raspberry Pi的RX / TX引腳，因此我們將RX / TX輸出並帶有2pin接頭。
Schemaitc
Bi-directional level shifter circuit
This is a typical Bi-directional level shifter circuit to connect two different voltage section of an I2C bus. The I2C bus of Raspberry Pi uses 3.3V, however the chip DS1307 works at 5V, so this circuit will be needed. In the schematic above, Q1 and Q2 are N-Channel MOSFET 2N7002A, which act as a bidirectional switch. In order to better understand this part, you can refer to the AN10441
Technical Details
| Dimensions | 30mm x 23mm x 15mm |
| Weight | G.W 13.20g |
| Battery | Exclude |
Part List
| Pi RTC(DS1307) | 1 |
| 2pin header | 1 |
ECCN/HTS
