Hardware Reference
In-Depth Information
Table 3-2.
Rev 1.0 GPIO Header Connector P1 (Top View)
Lower Left
Upper Left
3.3 V power
P1-01
P1-02
5 V power
GPIO 0 (I2C0_SDA)+
R1=1.8k
P1-03
P1-04
5 V power
GPIO 1 (I2C0_SCL)+
R2=1.8k
P1-05
P1-06
Ground
GPIO 4 (GPCLK 0/1-Wire)
P1-07
P1-08
GPIO 14 (TXD)
Ground
P1-09
P1-10
GPIO 15 (RXD)
GPIO 17
P1-11
P1-12
GPIO 18 (PCM_CLK)
GPIO 21 (PCM_DOUT)
P1-13
P1-14
Ground
GPIO 22
P1-15
P1-16
GPIO 23
3.3 V power
P1-17
P1-18
GPIO 24
GPIO 10 (MOSI)
P1-19
P1-20
Ground
GPIO 9 (MISO)
P1-21
P1-22
GPIO 25
GPIO 11 (SCKL)
P1-23
P1-24
GPIO 8 (CE0)
Ground
P1-25
P1-26
GPIO 7 (CE1)
Lower Right
Upper Right
■
the Model a can supply a maximum of 500 ma from the +5 V pins of p1. the
model B has a lower maximum limit of 300 ma. these limits are due to the fusible link F3 on
the pCB (shown previously in Figure 2-2 in Chapter 2). note also for both models, the +3.3 V
pins of p1 and p5 are limited to a maximum of 50 ma. this is the remaining capacity of the
onboard voltage regulator. GpiO currents also draw from this resource. (See Figure 2-3.)
Caution
Table
3-3
shows the connections for the Model B revision 2.0. According to the
Raspberry Pi website
14
, these pin assignments are not expected to change beyond Rev 2.0
in future revisions. The additional Rev 2.0 header P5 is shown in Table
3-4
.
■
Chapter 5 provides more information on identifying your raspberry pi. if you have
an early pre rev 2.0 board, be aware that the GpiO pins differ.
Note
