![\"rpi_model_b_plus_io_pinouts\"](\"https:\/\/raspberry-projects.com\/pi\/wp-content\/uploads\/2014\/09\/rpi_model_b_plus_io_pinouts.jpg\")
<\/a>\n<\/p>\n\nNote that we are not currently sure if the new pin 27-40 PWM1, GPCLK1 and GPCLK2 peripheral pin functions will be made accessible under Raspbian and if so which pins they will be assigned to, hence the duplicated pins shown with these functions.<\/em>\n<\/p>\n \nThe P5 connector is not present on the new Model B+ board and its pins have not been moved to the new J8 connector,. This means the loss of the 2nd I2C port (although this peripheral is available via the display and camera FFC connectors – TBC if this is easy to enable for general use under Raspbian). The pins that are no longer present via a header are:\n<\/p>\n \nI2C0 SDA \/ GPIO28 \nExternal circuitry may draw up to a total of 50mA max current from the 3.3V Out pins (true for Model B so presumably true for Model B+ but not confirmed as full schematic not yet available).\n<\/p>\n \nIs maximum current from 3.3V pin really 50mA?<\/a>\n<\/p>\n \nAll IO pins are 3.3V, not 1.8V. Pins are not 5V tolerant.\n<\/p>\n \nFull details are available here<\/a>\n<\/p>\n \nMaximum 16mA per IO pin (sink or source) with the total current from all pins not exceeding 51mA (true for Model B so presumably true for Model B+ but not confirmed as full schematic not yet available). See a detailed explanation here<\/a>.\n<\/p>\n \nIts likely all pins are set as inputs on power up (TBC).\n<\/p>\n \nI2C pins (e.g. Pj-3 and P8-5) are therefore high due to the pull up resistors on these pins.\n<\/p>\n \nThe GPIO ports include the ability to enable and disable internal pull-up or pull-down resistors from code.\n<\/p>\n \nPull-up is 50K min – 65K max.\n<\/p>\n \nPull-down is 50K min – 60K max.\n<\/p>\n \n1K8 pull up resistors are included on the RPi board so are not needed externally (true for Model B so presumably true for Model B+ but not confirmed as full schematic not yet available).\n<\/p>\n \nInterfacing the RPi 3.3V I2C pins to a 5V device like an Arduino – see here<\/a>.\n<\/p>\n \nThe Chip Select signals are for up to two independent slave devices. It seems that with the SPI port enabled in Raspbian both the CS0 and CS1 pins are assigned to it and therefore can't be used as IO (our assumption – correct?)\n<\/p>\n \nThe PWM pin available on the GPIO header is shared with the Audio system (true for Model B so presumably true for Model B+ – not confirmed as full schematic not yet available). This means that you can't use the PWM output and play audio through the 3.5mm jack at the same time.\n<\/p>\n \nSee our other page here<\/a>\n<\/p>\n\nLost From The Model B Rev 2 Board
\n<\/h4>\n
\nI2C0 SCL \/ GPIO29
\nGPIO30
\nGPIO31\n<\/p>\n\n3.3V Output
\n<\/h4>\n\nIO Pins
\n<\/h4>\n\nMax Current
\n<\/h5>\n\nPower-up State
\n<\/h5>\n\nPull-Up & Pull-Down resistors
\n<\/h5>\n\nI2C
\n<\/h4>\n\nSPI
\n<\/h4>\n\nPWM Pin
\n<\/h4>\n\n3.3V \/ 5V Interfacing
\n<\/h4>\n\nID_SD & ID_SC Pins
\n<\/h4>\n