Raspberry Pi_Eng_02.4.2 Current Consumption by Device

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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.

Raspberry Pi_Eng_02.4.1 Micro USB Power Supply Port

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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.

Raspberry Pi_Eng_02.2 SoC, CPU and Memory

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2.2 SoC, CPU and Memory

● System on a Chip(SoC)

Raspberry Pi is a System on a Chip (SoC) type computer. System on a Chip (SoC) refers to the way in which all electronic components required for computer operation are concentrated on one chip. In this method, the CPU, GPU, USB controller, RAM, Northbridge, Southbridge, and other components are compressed and bundled together on one chip without installing separate chips.

Raspberry Pi_Eng_02.1.2 Characteristics Comparison of Raspberry Pi Model

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2.1.2 Characteristics Comparison of Raspberry Pi Model

● Characteristics of Raspberry Pi 1 model A and Raspberry Pi 1 model B

device

Raspberry Pi 1 model A/A+

Raspberry Pi 1 model B/B+

SoC

Broadcom BCM2835

Broadcom BCM2835

CPU

700MHz Single-Core

ARM 1176JZFS

700MHz Single-Core

ARM 1176JZFS

Raspberry Pi_Eng_02.1.1 Basic configuration of Raspberry Pi

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2.1 Hardware Configuration of Raspberry Pi

2.1.1 Basic configuration of Raspberry Pi

The hardware of Raspberry Pi has depends on the model, but the basic framework maintains the same structure as before. However, as the popularity of Raspberry Pi has increased recently, and the requirements for higher performance and various functions have been raised, and thus usage area has been expanded, hardware configuration of the latest model is slightly changed to support higher performance and add new functionality.

Raspberry Pi_Eng_01.2 Features of the Raspberry Pi

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1.2 Features of the Raspberry Pi

● Small size

Raspberry Pi is a System on a Chip (SoC) type computer. System on a Chip (SoC) refers to the way in which all electronic components required for computer operation are concentrated on one chip. All the functions are installed on one board and additional work for installation or assembly is not necessary. And it is a completely working computer by itself.

Raspberry Pi is a very small computer with the size of a credit card. It can be easily attached to other machines or equipment if necessary, and it is also very easy to carry because of its small size.

Raspberry Pi_Eng_01.1.2 Development History of the Raspberry Pi

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1.1.2 Development History of the Raspberry Pi

Raspberry Pi is launched in April 2012 with the first Raspberry Pi 1 model B, and Raspberry Pi 1 model A was released in November 2012 to the world.

Since then, improvements have been made to the functions of model A and model B, and Raspberry Pi B+ in July 2014 and Raspberry Pi A+ in November 2014 was supplied. They have increased the number of USB ports to 4, enabled Micro SD cards, and expanded the GPIO pin to 40 to enhance the system for the improved usability and various applications.

The popularity of Raspberry Pi has increased and there is a lot of demand for universal use. So there is a need to run a bigger program, and system performance improvement work has been done. As a result, Raspberry Pi 2 has been released in February 2015. It is equipped with a CPU that supports 900MHz quad-core and supports 1GB of RAM to run large programs.

Raspberry Pi_Eng_01.1.1 Birth of the Raspberry Pi

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1.1 Overview

1.1.1 Birth of the Raspberry Pi

Raspberry Pi (abbreviated as RPi or RasPi) is a very cheap credit card-sized Linux computer developed by the British charity Raspberry Pi Foundation, originally developed to teach computer programming to students from poor countries around the world.

Since then, because of its powerful functions, its small size and low cost, Raspberry Pi has been widely known around the world and become popular, and not only it has been used for computer education for children that is its original development purposes, but also many people have purchased and used it for their own business or personal purposes.