Monthly Archives: September 2012

RasPiComm Update

RasPiComm v3

I want to give you a short update about the status of the RasPiComm project.

We already have ordered parts for the first production batch of 1.000 RasPiComms. We expect all parts to arrive in 4 weeks, so the RasPiComm will be available in approximately 6 weeks.

We are also had a conversation with RS-Components. We are very confident that they will add the RasPiComm to their product lineup! So if everything works out the RasPiComm will be available worldwide!

Raspberry Pi with RasPiComm

Raspberry Pi with RasPiComm

The RasPiComm will most probably get a distinctive subsite on Designspark.

I made some changes to the final board, most of them are minor layout changes.

The pull-ups for the I2C were removed since they are already present on the Raspberry Pi. I still have to check how the I2C pull-ups are with the RasPi rev2.

ESD Protection
I also made an important change to the RS-232 and RS-485 ports. I added TVS-diodes for protection which is a massive improvement in terms of stability.

Here are the specs of the ESD-protection:

RS-232 port:

  • 300 watts peak pulse power (tp = 8/20µs)
  • ‹40 watts peak pulse power (tp = 10/1000µs)
  • ‹Transient protection for data and power lines to
    • IEC 61000-4-2 (ESD) ±15kV (air), ±8kV (contact)
    • IEC 61000-4-4 (EFT) 40A (5/50ns)
    • IEC 61000-4-5 (Lightning) 12A (1.2/50µs)

RS-485 port:

  • 400 watts peak pulse power (tp = 8/20µs)
  • ‹Transient protection for asymmetrical data lines to
    • IEC 61000-4-2 (ESD) ±15kV (air), ±8kV (contact)
    • IEC 61000-4-4 (EFT) 40A (5/50ns)
    • IEC 61000-4-5 (Lightning) 12A (8/20µs)

RasPiComm Technical Specifications

RasPiComm Technical Specifications

  • Size: 35,2 x 56mm
  • RS-485
    • up to 230.400 baud
    • pluggable screw terminal connector (A, B, GND)
  • RS-232
    • No hardware handshake
    • up to 115.200 baud
    • pluggable screw terminal connector (RX, TX, GND)
  • Real Time Clock
    • battery included
    • powers the clock for approximately 10 years
    • counts seconds, minutes, hours, date of the month, month, day of the week, and year with leap-year compensation valid up to 2100
  • 5 Inputs
    • connected to onboard joystick (4 way + push)
    • 5V tolerant
    • 2mm pitch external connector, not polulated
  • 2 Outputs,
    • 5V, 100mA max. each
    • 5V relays can be connected without additional circuitry
    • 2mm pitch connector, not populated
  • SPI Connector
    • 2mm pitch connector, not populated
  • 2 I2C Connectors
  • Power Connector
    • pluggable screw terminal connector (+, -)
    • either powers the Raspberry Pi and RasPiComm (5V, 1.5A max)
    • or is a power output when powered over USB
  • RasPiComm Power Ponsumption
    • max. 10mA (outputs off)
    • max. 210mA (outputs on and maximum rating drawn)
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