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VMX-pi Hardware Reference Manual (version 1.10)
I/O Summary
• 30 Digital I/O Channels
-
"FlexDIOs PWM-capable, H/W decode of 5 Quadrature Encoders
-
"High Current DIOs
- "Comm DIOs
and UART or Digital I/O functions
• 4 Analog Input Channels
• Dedicated CAN Interface
Analog
Inputs
(12-bit
resolution)
[5 or 3.3V]
4
150mA Analog
Supply
CAN
Figure 3 VMX-pi IO Summary
FlexDIO Channels: These channels drive 3.3V, are 5V tolerant when used as inputs, and each channel is
individually software configurable as input or output channel. FlexDIO channels have a lower output
current drive than other channel types, and support advanced timer functions including decoding of
signals from quadrature encoders.
High-Current DIO Channels: These channels drive 3.3V or 5V (jumper-configurable), and are jumper-
configurable to be either all inputs or all outputs. High-Current DIO channels provided enhanced
current-drive capabilities allowing them to be used to drive relays as well as motor controllers.
Analog Input Channels: These channels accept 3.3V or 5V input signals.
Comm DIO Channels: These channels drive 3.3V or 5V (jumper-configurable); some are fixed as input
channels, and some are as fixed output channels. These channels support a medium-current drive
capability to support communication across extended distances, subject to the restrictions of each
protocol; these channels are designed to support high-bandwidth communication rates.
VMX-pi I/O Summary
either all inputs or all PWM-capable outputs
PWM-capable outputs, 4 inputs) supporting SPI, I2C
High-
Current DIO
(PWM/Relay/
Digital Output
HW Quadrature Decode (Max 5 Pair [10 pins])
or Input)
[5 or 3.3V]
10
Up to 400mA Digital Supply
I2C
(or 2 DO or 2DI
(or 1 DO, 1DI)
w/pullups)
FlexDIO
PWM/Digital IOs (Max 12)
3.3 V (5V Tolerant
12
Comm DIO
[5 or 3.3V]
TTL UART
(or 3 DO, 1DI)
inputs)
SPI
8
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