This chip allows CircuitPet to switch between Run Mode and programming mode!

CircuitPet can communicate with your computer over USB, thanks to this little guy! 

This transistor is mainly designed for low-gain signal amplification. Normally when a low gain signal is amplified to high gain, then the noise with the signal is also get amplified, but this transistor possesses a low noise feature that filters the noise from the amplified signal, and hence you will get a low noise and high gain signal at the output.

This is a real-time clock. RTC is a battery-powered clock that is included in a microchip in a computer motherboard. A small memory on this microchip stores system description or setup values - including current time values stored by the real-time clock.  

This chip is what keeps your LiPo battery safely charged!

This chip is used as a voltage regulator.

This is a linear regulator used for supplying CircuitPet with power. Also, CN2626 adopts temperature regulation instead of over-temperature protection, which will regulate the output current to limit the die temperature during high power operation or high ambient temperature.