Raspberry Pi_Eng_02.4.2 Current Consumption by Device


Published Book on Amazon


All of IOT Starting with the Latest Raspberry Pi from Beginner to Advanced – Volume 1
All of IOT Starting with the Latest Raspberry Pi from Beginner to Advanced – Volume 2


출판된 한글판 도서


최신 라즈베리파이(Raspberry Pi)로 시작하는 사물인터넷(IOT)의 모든 것 – 초보에서 고급까지 (상)
최신 라즈베리파이(Raspberry Pi)로 시작하는 사물인터넷(IOT)의 모든 것 – 초보에서 고급까지 (하)


Original Book Contents


2.4.2     Current Consumption by Device

 

Raspberry Pi has a limited current that can be supplied to the entire USB port. Raspberry Pi 1 model A, A+, B can supply up to 500mA of current to all USB devices. Raspberry Pi model 1 model B+ and Raspberry Pi 2 model B can supply up to 600mA/1.2A current to all USB devices, which can be switched according to the firmware setting. The Raspberry Pi 3 model B has been improved to provide up to 1.2 A current to the USB port, allowing you to connect more USB devices which requires much current directly to Raspberry Pi compared to the previous models.

 

If you want to connect a USB port to a device that requires more power than the available current of total USB port, you can not supply enough current with the system power, and you need to connect it through a USB hub with external power.

 

The GPIO pin can safely use up to 50mA of current, which is distributed to each GPIO pin. Individual GPIO pins can only safely use currents within 16mA. The HDMI port uses 50mA and the camera module requires 250mA. A keyboard or mouse can use as little as 100mA depending on the device, but can use more than 1000mA