AVR16EB32 datasheet(26/46 Pages) MICROCHIP

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AVR16EB32 Curiosity Nano

Hardware Implementation

User Guide

DS50003605B - 26

Do not apply any voltage to the VOFF pin. Let the pin float to enable the power

supply.

The absolute maximum external voltage is 5.5V for the on-board level shifters,

and the standard operating condition of the AVR16EB32 is 1.8–5.5V. Applying a

higher voltage may cause permanent damage to the board.

Info: The on-board debugger monitors the voltage supplied to the board. If

VOFF is not pulled low and external power is supplied that differs by more

than ±100 mV from the target regulator setting, the on-board debugger will shut

off the target regulator and begin blinking the status LED rapidly, indicating an

error condition. Once the input voltage returns to within ±100 mV of the target

regulator setting, the on-board debugger will switch on the target regulator and

stop blinking the status LED.

Programming, debugging, and data streaming are still possible with an external power supply. The

USB cable will power the debugger and signal level shifters. Both regulators, the debugger, and the

level shifters are powered down when the USB cable is removed.

Info: In addition to the power consumed by the AVR16EB32 and its peripherals,

approximately 100 µA will be drawn from any external power source to power

the on-board level shifters and voltage monitor circuitry when plugging a USB

cable into the DEBUG connector on the board. When a USB cable is unplugged,

some current is used to supply the level shifter’s voltage pins, having a worst-case

current consumption of approximately 5 µA. Typical values may be as low as 100

nA.

4.4.4

Power Supply Exceptions

This section sums up most exceptions that can occur with the power supply.

Target Voltage Shuts Down

Not reaching the target voltage setting can happen if the target section draws too much current at

a given voltage and causes the thermal shutdown safety feature of the MIC5353 regulator to kick in.

To avoid this, reduce the current load of the target section.

Target Voltage Setting is Not Reached

The USB input voltage (specified to be 4.4-5.25V) limits the maximum output voltage of the MIC5353

regulator at a given voltage setting and current consumption. If a higher output voltage is needed,

use a USB power source with a higher input voltage or use an external voltage supply on the VTG

pin.

Target Voltage is Different From Setting

An externally applied voltage to the VTG pin without setting the VOFF pin low can cause this. If the

target voltage varies more than 100 mV over/under the voltage setting, the on-board debugger will

detect it, and the internal voltage regulator will shut down. To fix this issue, remove the applied

voltage from the VTG pin, and the on-board debugger will enable the on-board voltage regulator

when the new condition is detected. Note that the PS LED will blink rapidly if the target voltage is

below 100 mV of the setting but will ordinarily turn on when higher than 100 mV above it.

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