Mega-IO Expansion Card for Raspberry Pi/Zero

Description

The Sequent Microsystems Mega-IO Expansion Card for Raspberry Pi/Zero is a stackable expansion card for Raspberry Pi B+, 2, 3 and Zero. Two of the Raspberry Pi’s GPIO pins are used for I2C communication. Another pin is allocated for the interrupt handler, leaving 23 GPIO pins available for the user.  Up to four MEGA-IO cards can be stacked on top of a Raspberry Pi. Any of the inputs of the MEGA-IO can be configured as interrupt inputs.

The top 40 pin header plugs into the Raspberry Pi GPIO header and passed through the pins to the next MEGA-IO expansion card. The bottom 40 pin header is a right-angle connector for I/O expansion. The eight Relays are numbered from upper left to lower right. Numbering the Relays is important to associate them correctly with the Relay Headers and Relay LEDs. The Relays are SPST, with three output pins labeled COM, NO and NC.

Technical specifications

Microcontroller: STM8L151C8U6

• Operating voltage: 3.3V
• CPU frequency: 16 MHz
• Touch sensing capability
• Max. input voltage on any pin: 4V
• Series protection resistor on IO pins: 51 Ohms
• Output Low-Level Voltage on I/O pins: Max. 0.45V
• Output High-Level Voltage on I/O pins: Min. 2.6V

Four Open Drain Outputs:

• Driver: ULN2003F12FN-7
• Output Low Voltage: 0.6V
• Max Pull Up Voltage: 20V
• Max sink per channel: 100mA @ 3.3V Logic Input
• 140mA @ 5.0V Logic Input
• ESD: 4kV HBM, 1kV CDM

Eight 12 Bit Adc:

• Sample rate: Up to 1 Msps
• Input low pass filter: 0.22µF/51 Ohms

Optoisolators: TLP293-4

• LED current limit resistor: 1 Kohm
• Input Forward Current: Typ. 5 mA, Max 50 mA
• Input Reverse Voltage: 5V
• Input Forward Voltage: 1.25V @ 10 mA
• Isolation Resistance: Min 10 exp(12) Ohms
• Isolation Voltage: Typ 10,000 V

Relays: SRD-05VDC-SL-C

• Relay max current/voltage: 10A/25V
• PCB max current/voltage: 2.5A/24V

Power Requirements:

• 60 mA @ +5V (all relays off)
• 800 mA @ 5V (all relays on)

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