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KAmodRPiRTC

Description

KAmodRPiRTC is a functional expander for RaspberryPi and Raspberry Pi+ minicomputers, that make possible to equip them with RTC real time clock (M41T00S from STMicroelectronics offer) integrated with the calendar and automatic battery maintaining.

Fota na i strone.JPG


Basic features and parameters
  • compatibility with minicomputer RaspberryPi and RaspberryPi+
  • Communication with microporcessor systems via I2C interface (channel 0)
  • Embedded one-chip RTC from STMicroelectronics (M41T00S)
  • Extended I/O connector of RPi minicomputer
  • Embedded battery to maintaining of RTC work
  • Power supply voltage range 2.7...5.5VDC
  • Power consumption <400 µA


Rpi B plus.jpg

The expander is adapted to cooperate also with RaspberryPi+ minicomputers


Standard equipment
Code Description
KAmodRPiRTCr
  • Assembled and launched board with battery 3V (CR2032)


Schematic
KAmodRPiRTC schemat.png


View of board
Pcb.jpg


Embedded RTC

In the expander are used a single-chip RTC M41T00S from STMicroelectronics. The system is a complete calendar, it is also equipped with a monitor of the supply voltage level and an automatic switch connecting the battery supply voltage in the event of a failure of the main supply voltage. The M41T00S chip communicates with the microprocessor of the RPi minicomputer (RPi+) using the I2C interface (channel 0).

Rtc.jpg

The lines used for RTC communication with the microprocessor are shown in the table below.

Line Function Number of GPIO pin Comments
GPIO2 SDA 3 Lines pulled up to +3,3 V with 4,7kΩ resistors
GPIO3 SCL 5 Lines pulled up to +3,3 V with 4,7kΩ resistors
Installation of expander on RaspberryPi minicomputer
KamodRTC RPi.jpg


Installation of expander on RaspberryPi+ minicomputer
KamodRTC RPi B plus.jpg