v32

21

10-Dec-2020

14. Advanced information

The following section is for more advanced users.

GPIO usage / Pin headers)

The IQaudio range of sound cards for the Raspberry Pi take advantage of a number of Pi signals in

order to operate successfully. Some of these signals are solely for the use of the IQaudio board and

some can be shared with other peripherals, sensors, etc. The information below covers the general

cases. For more Raspberry Pi GPIO information please see the excellent site: https://pinout.xyz

We expect the following Raspberry Pi GPIO to be used by IQaudio audio boards

• ALL POWER PINS

• ALL GROUND PINS

• GPIO 2/3 (I2C)

• GPIO 18/19/20/21 (I2S)

If appropriate then the following are also used

• GPIO 22 (DigiAMP+ mute / unmute support)

• GPIO 23/24 for Rotary Encoder (physical volume control) or status LED (Codec Zero)

• GPIO 25 for the IR Sensor.

• GPIO 27 for the Rotary Encoder push switch / Code Zero switch

DAC PRO, DAC+, DigiAMP+, Codec Zero

SIGNALS

Pin

Name

Name

Pin

1

3V3 (DC Power)

☐

☐

(DC Power) 5V

2

Shared Use

3

GPIO2 (I2C SDA1)

☐

☐

(DC Power) 5V

4

Shared Use

5

GPIO3 (I2C SCL1)

☐

☐

(Ground) 0V

6

7

GPIO4 (GCLK)

☐

☐

(TXD0) GPIO14

8

9

0V (Ground)

☐

☐

(RXD0) GPIO15

10

11

GPIO17 (GEN0)

☐

☐

(I2S CLK) GPIO18

12

I2S Audio

Encoder / Button

13

GPIO27 (GEN2)

☐

☐

(Ground) 0V

14

DigiAMP+ (Mute)

15

GPIO22 (GEN3)

☐

☐

(GEN4) GPIO23

16

Rotary Encoder / LED

17

3V3 (DC Power)

☐

☐

(GEN5) GPIO24

18

Rotary Encoder / LED

19

GPIO10 (SPI_MOSI)

☐

☐

(Ground) 0V

20

21

GPIO9 (SPI_MISO)

☐

☐

(GEN6) GPIO25

22

IR Receiver

23

GPIO11 (SPI_CLK)

☐

☐

(SPI_CE0_N) GPIO8

24

25

0V (Ground)

☐

☐

(SPI_CE1_N) GPIO7

26

EEPROM

27

ID_SD (HAT)

☐

☐

(HAT) ID_SC

28

EEPROM

29

GPIO5

☐

☐

(Ground) 0V

30

31

GPIO6

☐

☐

GPIO12

32

33

GPIO13

☐

☐

(Ground) 0V

34

I2S Audio

35

GPIO19 (I2S)

☐

☐

GPIO16

36

37

GPIO26

☐

☐

(I2S DIN) GPIO20

38

I2S Audio

39

0V (Ground)

☐

☐

(I2S DOUT) GPIO21

40

I2S Audio