OLIMEX© 2015
AM3352-SOM user's manual
CHAPTER 5: CONTROL CIRCUITY
5. Introduction to the chapter
Here you can find information about reset circuit and quartz crystals locations, the power supply
circuit is also briefly discussed.
5.1 Reset
The board has hardware reset is handled by MCP130T-300I/TT – a voltage supervisory device
designed to keep a microcontroller in reset until the system voltage has reached the proper level and
stabilized. The processor ball responsible for the reset of the board is ball A10 (WARMRSTn).
There is a hardware reset button placed on the board. The name of the button is “RST”.
It is a good practice to perform software reset of the board. Performing a hardware reset or power-
cycling the board (reset by disconnecting and re-applying the main power supply) might lead to
software corruption of the operating system of choice.
5.2 Clocks
RTC clock (32 768Hz) is connected to balls A4 and A6.
24 MHz quartz crystal Q2 is found at balls V11 and V10 of the AM3352 processor.
5.3 Power supply circuit
A stand-alone AM3352-SOM consumes around 0.10A when connected to a 5V voltage source
(provided at UART0 pins “GND” and “+5V”).
During heavy computational tasks the processor consumption might raise up to 0.15A of current
(tested at 5V of voltage with 'top d0').
The current consumed might have peaks as high as 0.20A during start-up when different on-board
modules are initialized.
Make sure your power supply is capable of providing at least 0.5A of current at 5V of voltage
(2.5W).
For more info on how to power the board refer to chapter “3.3 Powering the board”.
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