PI 2 Design PI2AES-LITE, Hardware Reference Manual

Page: 10 / 18

Pi 2 Design – PI2AES-LITE Hardware Reference Manual – P0.1 - 5/23/2022
PAGE 10
RPi
PIN DIR AF PUP/
PDN
PI2AES-
LITE
Name
Description/Notes
22 - - - GPIO25 Unused
23 - - - GPIO11 Unused
24 - - - GPIO8 Unused
25 - - - GND
26 - - - GPIO1 Unused
27 I/O Y - ID_SDA Unused
28 OUT Y - ID_SCL Unused
29 - - - GPIO5 1 = Select 22.5792Mhz Clock Input to WM8804
30 - - - GND
31 OUT - PUP GPIO6 1 = Select 24.576Mhz Clock Input to WM8804
32 - - - GPIO12 Unused
33 OUT - - GPIO13 Unused
34 - - - GND
35 IN Y - LRCLK I2S Left/Right Clock from WM8804
36 - - - GPIO16 Unused
37 - - - GPIO26 Unused
38 - - - GPIO20 Unused
39 - - - GND
40 OUT Y - SDOUT Pi I2S Serial Audio Data Out
Table 4 – CPU GPIO Pin Assignments
5.1.1 RPI GPIO NOTES
1. DIR is from the point of view of the RPi.
2. Y in the Alternate Function (AF) column indicates that the use of this pin
requires the pin to be assigned to the function as defined by the RPi
specifications.
3. PUP/PDN indicates if the GPIO should have its associated Pullup (PUP)
or Pulldown (PDN) resistor enabled.
4. An asterisk ‘*’ at the beginning of the name indicates a low true signal.