Raspberry Pi_Eng_02.4.1 Micro USB Power Supply Port


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   Power Supply

 

2.4.1     Micro USB Power Supply Port

 

Raspberry Pi supports Micro USB socket to power the system. Micro USB sockets are a common standard for charging mobile phones and mobile devices.

 

The power supplied to the system is using a 5.1V DC power supply. How much current is needed in Raspberry Pi depends on the type of Raspberry Pi model and number of peripherals connected to Raspberry Pi.

 

The following shows the standard current consumption of each model of Raspberry Pi, and the maximum amount of current that can be consumed in the entire USB device, and the current consumption when only the board is operated without a peripheral device.

 

Product

Recommended

PSU current

consumption

Maximum current consumption of all USB peripherals

Operating current consumption of typical bare-board

RasPi 1 model A

700mA

500mA

200mA

RasPi 1 model A+

700mA

500mA

180mA

RasPi 1 model B

1.2A

500mA

500mA

RasPi 1 model B+

1.8A

600mA/1.2A (switchable)

330mA

RasPi 2 model B

1.8A

600mA/1.2A (switchable)

RasPi 3 model B

2.5A

1.2A

~400mA

Table 2‑3 Power consumption by Raspberry Pi model

 

In this diagram, the "PSU recommendation" is based on the maximym typical current consumption, which is the typical power consumption measured when each board operates in a "desktop computer" configuration. In this table, it is recommended that the Raspberry Pi 1 will be provided with 700 mA current supply, Raspberry Pi 2 model B with 1.8 A current supply, and Raspberry Pi 3 model B with 2.5 A current supply.

 

 

Generally, Raspberry Pi is known to be able to run in almost operating environments if only the officially recommended minimum power supply is available, but more power may be needed depending on the circumstances. For example, in the situation of a model that supports 4 USB ports, if external devices that consume a lot of current can not be connected through an externally powered USB hub and should be connected to the USB port directory, it coould be necessary to use a power supply that supplies much more current.