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Amps, Volts, Power Converters and Power Supplies.

Step 3. EZ-B v4 Port Pins.

Electrical details for the EZ-B v4...

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A break down of the EZ-B v4 pin specifications.

Vin (Voltage input) = 4.5-16VDC Unregulated input voltage (Digital port section Red power pins)

Vcc (Voltage Common Collector) = 3.3VDC Regulated voltage (Analog port section Red power pins)

VDC: meaning "Volts of Direct Current".


The "minimum" input voltage from a power source that powers the EZ-B v4 is 4.5VDC.

The "maximum" input voltage from a power source that powers the EZ-B v4 is 16VDC.

The "maximum" continuous current draw through the EZ-B v4, is 5 amps. (limited by reverse polarity protection).

The "maximum" momentary power spike through the EZ-Bv4 is 20 amps (limited by 20A ATM Fuse in power base or power harness).


The "maximum" continuous current draw on the EZ-B v4 Vcc (3.3VDC) regulated supply (middle red power pins on analog ports), is 1 amp.

The "maximum" momentary power spike on the EZ-B v4 Vcc (3.3VDC) regulated supply (middle red power pins on analog ports), is 3 amps.

The EZ-B's current draw with no devices connected to it, is 80 milliamps. With the EZ-Robot camera connected, it's 180milliamps.

The digital I/O pin (white signal pin) voltage output "high" level, is 3.3VDC.

The digital I/O pin (white signal pin) voltage output "low" level, is 0VDC.

The digital I/O pin minimum voltage input "high" level is 1.6VDC.

The digital I/O pin maximum voltage input "high" level is 3.3VDC (5V tolerant).

The digital I/O pin minimum voltage input "low" level is 0VDC.

The digital I/O pin maximum voltage input "low" level is 1VDC .

The source/sink limitation from a single digital signal pin is 10milliamps. (up to 120mA total for all pins combined).

The ADC reads voltage levels from 0-3.6VDC but is 5V tolerant (voltage from 3.6V to 5V will likely show up as 3.6VDC).

The ADC signal pin "minimum" voltage level, is 0VDC.

The ADC signal pin "maximum" input voltage level, is 3.6VDC (5v tolerant).

The ADC power (centre) pin voltage, is 3.3VDC (regulated).


The i2c communication voltage level is 3.3VDC. (5V tolerant)
The i2c power pin voltage, is 3.3VDC (regulated).


The UART (port 0) communication voltage level, is 3.3VDC (5V tolerant).

The UART (port 0) power pin voltage, is 3.3VDC (regulated)


The Camera TTL communication voltage is 3.3VDC. (5V tolerant)

The Camera power pin voltage, is 3.3VDC (regulated)


Where it is noted that the digital power pins can handle 5 amp per digital pin, this is combined constant amperage of 5A for all the digital power pins. The maximum amperage for each pin is 2 amps per pin. While you can have a spiked (pulsed) current up to 20A, the ez-bv4 is only rated for 5A of constant current.