pinout.vvzero.com/src/en/overlay/iqaudio-pi-dac.md

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<!--
---
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name: "Pi-DAC+"
manufacturer: IQaudIO
buy: http://www.iqaudio.co.uk
description: An I2S digital to analog audio converter HAT for the Pi
install:
'devices':
- 'i2c'
pincount: 40
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pin:
3:
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mode: i2c
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5:
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mode: i2c
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12:
name: I2S
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15:
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name: Mute/Unmute
description: Pi-AMP+ only (optional)
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16:
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name: Rotary Encoder
description: (optional)
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18:
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name: Rotary Encoder
description: (optional)
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22:
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name: IR Sensor
description: (optional)
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35:
name: I2S
38:
name: I2S
40:
name: I2S
-->
#IQaudIO Pi-DAC+
The Pi-DAC+ takes the digital audio signals (I2S) from the Raspberry Pi and through the
onboard Texas Instruments PCM5122 DAC delivers variable output (hardware volume
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control) analog audio to the Pi-DAC+ Phono connectors. The PI-DAC+ also, via the
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Texas Instruments TPA6133A headphone amp, supports the direct use of headphones via
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the Pi-DAC+ 3.5mm audio jack.
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The Pi Dac uses GPIO22 to mute/unmute the Pi-AMP+.
You can use GPIO25 to connect an IR sensor and GPIO23/24 for a rotary encoder. Both of
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these parts are optional, but are broken out on the Pi-DAC+ for convenient access.
Note: pins reserved for the rotary encoder and IR sensor can be used for other purposes if those add-ons have not been fitted and enabled by software.