Chips and other components on my Arduino Uno board

Let us have a look at the chips and some other components seen on the Arduino Uno board.

This is the ATmega328 on the Arduino Uno board, about which I had posted earlier in connection with Arduino Nano and as a seperate post. It is an 8-bit microcontroller which has 32 KB flash memory. ATmega328 has a maximum CPU speed of 20 MHz.

The components marked 47 and 25V are surface mount capacitors of 47 microfarad capacity and working voltage 25V. LM358 is a low-power dual operational amplifier integrated circuit. As you can see, it is an 8 pin integrated circuit. The part labelled 662K is a low dropout (LDO) regulator for providing a stable voltage supply. It is rated for 3.3V, 250mA. MS1117 5.0 is a linear voltage regulator with low voltage drop. It can provide 5V regulated output with an unregulated 9V DC input.

CH340C is a USB to serial converter chip. It is a full speed USB 2.0 device with baud rate 50 bps to 2 Mbps. Below that you can see a crystal oscillator, the inscription on which is not clear, though I tried visualization from various angles with different illuminations.

The reset button near the USB type B port is seen here.

A1SHB is a P-Channel MOSFET.

This is the underside of Arduino Uno board, with no chips seen.

Another crystal oscillator with the part number clearly seen, unlike the previous one on which the number was not clear.

This view shows both the crystal oscillators together. LEDs in a vertical row can be seen marked as ON, RX, XT and L. ON will light up with power on, RX and XT during data transmission and L blinks while power is on and the blinking rate can be controlled by programming, as with Arduino Nano.

ON and L LEDs have been captured in on position after connecting a USB power bank using a Type A to Type B USB cable.