Fire Bird V ATMEGA2560 Hardware Manual
3.19.9 REF5050 precision reference voltage generator
ATMEGA2560 microcontroller’s ADC channels require external stable voltage reference. In the
default state microcontroller uses “5V uC Supply” as a external reference voltage. In case if you
want to interface microcontroller with the sensors where precision is very important then
REF5050 external reference voltage generator can be added on the microcontroller board. In the
default state voltage reference is directly taken from “5V uC supply” by connecting pins 2 and 1
of the pads of SJ1 which is located just below the J2 on the microcontroller board. Figure 3.71
shows mounting of REF5050 and change in the solder pad shorting.
Figure 3.70: REF5050 Schematic
Figure 3.71: Left- Jumper shorted to use 5V uC as A Ref. Right- REF5050 is installed and
jumper shorted to use its 5V output as reference.
© NEX Robotics Pvt. Ltd. and ERTS Lab, CSE, IIT Bombay, INDIA 73