Hardware Reference
In-Depth Information
Table 3-3.
Rev 2.0 GPIO Header Connector P1 (Top View)
Lower Left
Upper Left
3.3 V power, 50 mA max
P1-01
P1-02
5 V power
GPIO 2 (I2C1_SDA1)+R1=1.8k
P1-03
P1-04
5 V power
GPIO 3 (I2C1_SCL1)+R2=1.8k
P1-05
P1-06
Ground
GPIO 4 (GPCLK 0/1-Wire)
P1-07
P1-08
GPIO 14 (TXD0)
Ground
P1-09
P1-10
GPIO 15 (RXD0)
GPIO 17 (GEN0)
P1-11
P1-12
GPIO 18 (PCM_CLK/GEN1)
GPIO 27 (GEN2)
P1-13
P1-14
Ground
GPIO 22 (GEN3)
P1-15
P1-16
GPIO 23 (GEN4)
3.3 V power, 50 mA max
P1-17
P1-18
GPIO 24 (GEN5)
GPIO 10 (SPI_MOSI)
P1-19
P1-20
Ground
GPIO 9 (SPI_MISO)
P1-21
P1-22
GPIO 25 (GEN6))
GPIO 11 (SPI_SCKL)
P1-23
P1-24
GPIO 8 (CE0_N)
Ground
P1-25
P1-26
GPIO 7 (CE1_N)
Lower Right
Upper Right
Table 3-4.
Rev 2.0 P5 Header (Top View)
Lower Left
Upper Left
(Square) 5 V
P5-01
P5-02
3.3 V, 50 mA
GPIO 28
P5-03
P5-04
GPIO 29
GPIO 30
P5-05
P5-06
GPIO 31
Ground
P5-07
P5-08
Ground
Lower Right
Upper Right
Safe Mode
If your Raspbian SD image supports it, a
safe mode
can be activated when needed. The
New Out of Box Software (NOOBS) image still appears to support this feature.
Pin P1-05, GPIO 3 is special to the boot sequence for Rev 2.0 models. (This is GPIO 1 on
the pre Rev 2.0 Model B.) Grounding this pin or jumpering this to P1-06 (ground) causes the
boot sequence to use a safe mode boot procedure. If the pin is used for some other purpose,
you can prevent this with configuration parameter avoid_safe_mode=1. Be very careful that
you don't accidentally ground a power pin (like P1-01 or P1-02) when you do use it.
