PI2Embedded 502V2S
Hardware Reference Manual – P2.1 - 6/3/2016
PAGE 12
RPi
2
PIN
DIR
AF PUP/
PDN
502V2S
Name
Description/Notes
21
IN
-
-
MISO
GPIO9/SPI_MISO – from PMOD
22
OUT
-
-
WI_TXEN
GPIO25 – WiFi Transmit Enable
23
OUT
Y
-
SPI_CLK
GPIO11/SPI_CLK - to PMOD
24
OUT
Y
-
*SPI_CS0
GPIO8/*SPI_CS0 - to PMOD
25
-
-
-
GND
26
OUT
Y
-
*SPI_CS1
GPIO1/*SPI_CS1 - to PMOD
27
I/O
Y
-
ID_SDA
ID I2C Bus Data to/from 24AA32
28
OUT
Y
-
ID_SCL
ID I2C Bus Clock to 24AA32
29
OUT
-
-
MUTE
GPIO5 - to PCM5102A Soft Mute Enable
30
-
-
-
GND
31
OUT
-
-
DEMP
GPIO6 - to PCM5102A De-emphasis Enable
32
IN
-
PUP
VG_PG
GPIO12 - Power Supply Good
33
OUT
-
-
FILT
GPIO13 - to PCM5102A Filter Enable
34
-
-
-
GND
35
OUT
Y
-
I2S_LRCLK GPIO19 – to PCM5102 Left/Right Clock
36
OUT
-
-
WI_WPS
GPIO16 – WiFi WPS Enable
37
-
-
-
-
GPIO26 - Unused
38
IN
-
PUP
*RTC_INT
GPIO20 - DS1339 RTC Interrupt
39
-
-
-
GND
40
-
-
-
-
GPIO21 - Unused
Table 6 – 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.
