Power Supply; Target Regulator - Microchip Technology ATtiny1607 Curiosity Nano Hardware User's Manual

Figure 3-1. Curiosity Nano Standard Pinout
3.3

Power Supply

The kit is powered through the USB port and contains two LDO regulators, one to generate 3.3V for the
on-board debugger, and an adjustable LDO regulator for the target microcontroller ATtiny1607 and its
peripherals. The voltage from the USB connector can vary between 4.4V to 5.25V (according to the USB
specification) and will limit the maximum voltage to the target. The figure below shows the entire power
supply system on ATtiny1607 Curiosity Nano.
Figure 3-2. Power Supply Block Diagram
VUSB
USB
Power consumer
Power converter
Power protection
Power source
Cut strap
3.3.1

Target Regulator

The target voltage regulator is a MIC5353 variable output LDO. The on-board debugger can adjust the
voltage output supplied to the kit target section by manipulating the MIC5353's feedback voltage. The
hardware implementation is limited to an approximate voltage range from 1.7V to 5.1V. Additional output
voltage limits are configured in the debugger firmware to ensure that the output voltage never exceeds
the hardware limits of the ATtiny1607 microcontroller. The voltage limits configured in the on-board
debugger on ATtiny1607 Curiosity Nano are 1.8-5.1V.
©
2019 Microchip Technology Inc.
PS LED
NC
ID
CDC RX
CDC TX
DBG1
DBG2
CURIOSITY NANO
Target
Regulator
On/Off
Adjust
DEBUGGER
Regulator
PTC
Fuse
VBUS
ATtiny1607 Curiosity Nano
USB
DEBUGGER
VREG
VLVL
Measure
On/Off
I/O
P3V3
DEBUGGER
#VOFF
ID system
User Guide
Curiosity Nano
VBUS
VOFF
DBG3
DBG0
GND
VTG
VTG
Power Target
Supply Power
strap strap
I/O
I/O
Level GPIO
shifter straps
DS50002897A-page 10
Target
MCU