Raspberry PI 3 Model B
Raspberry PI 3 Modle B has the Broadcom BCM43438 chip which provides 2.4GHz 802.11n wireless LAN, Bluetooth Low Energy, and Bluetooth 4.1 Classic radio support. Cleverly built directly onto the board to keep costs down, rather than the more common fully qualified module approach, its only unused feature is a disconnected FM radio receiver and is so small, the markings can only be seen through a magnifying glass.
The Raspberry Pi 3 radios are connected to this chip antenna which is soldered directly on the board, This antenna should be more than capable of picking up wireless LAN and Bluetooth signals – even through walls. There’s no need to connect any external antenna's to the Raspberry Pi 3 unit.
The Broadcom BCM2837 system-on-chip (SoC) includes:
The Raspberry Pi 3 features the same 40-pin general-purpose input-output (GPIO) header as all the Pis going back to the Model B+ and Model A+. Any existing GPIO hardware will work without modification; the only change is a switch to which UART is exposed on the GPIO’s pins, but that’s handled internally by the operating system.
The Raspberry Pi 3 shares the same SMSC LAN9514 chip as its predecessor, the Raspberry Pi 2, adding 10/100 Ethernet connectivity, four USB channels to the board, and the SMSC chip connects to the SoC via a single USB channel, allowing you to use the USB-to-Ethernet adaptor and USB hub.
The Raspberry Pi 3 model B uses between:
2.5A power supply micro usb
SoC: Broadcom BCM2837
CPU: 4× ARM Cortex-A53, 1.2GHz
GPU: Broadcom VideoCore IV
RAM: 1GB LPDDR2 (900 MHz)
Networking: 10/100 Ethernet, 2.4GHz 802.11n wireless
Bluetooth: Bluetooth 4.1 Classic, Bluetooth Low Energy
GPIO: 40-pin header, populated
Ports: HDMI, 3.5mm analogue audio-video jack, 4× USB 2.0, Ethernet, Camera Serial Interface (CSI), Display Serial Interface (DSI)