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CE #2650

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26 changes: 12 additions & 14 deletions documentation/asciidoc/accessories/iqaudio/codec_zero.adoc
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=== Raspberry Pi Codec Zero

Raspberry Pi Codec Zero is a Raspberry Pi Zero sized audio HAT. It delivers bi-directional digital audio signals (I2S) between Raspberry Pi and its onboard Dialog Semiconductor DA7212 codec. The Codec Zero has multiple features and supports a range of input and output devices:
Raspberry Pi Codec Zero is a Raspberry Pi Zero-sized audio HAT. It delivers bi-directional digital audio signals (I2S) between a Raspberry Pi and the Codec Zero's on-board Dialog Semiconductor DA7212 codec. The Codec Zero supports a range of input and output devices.

* High performance 24-bit audio codec
* Supports common audio sample rates between 8-96kHz
* Built in MEMS (micro-electro-mechanical) microphone (Mic2)
* Mono Electret microphone (Mic2 left)
* Built in micro-electro-mechanical (MEMS) microphone (Mic2)
* Mono electret microphone (Mic2 left)
* Automatic MEMS disabling on Mic2 insert detect
* Supports additional (no fit) Mono Electret microphone (Mic1 right)
* Supports additional (no fit) mono electret microphone (Mic1 right)
* Stereo auxiliary input channel (AUX IN) - PHONO/RCA connectors
* Stereo auxiliary output channel (Headphone / AUX OUT)
* Flexible analog and digital mixing paths
* DSP (Digital Signal Processors) for ALC (Automatic Level Control)
* 5-band EQ (Equalisation)
* Mono line-out / mini speaker driver: 1.2W @ 5V, THD<10%, R=8Ω
* Stereo auxiliary output channel (Headphone/AUX OUT)
* Flexible analogue and digital mixing paths
* Digital signal processors (DSP) for automatic level control (ALC)
* Five-band EQ
* Mono line-out/mini speaker driver: 1.2W @ 5V, THD<10%, R=8Ω

image::images/Codec_Zero_Board_Diagram.jpg[width="80%"]

The Codec Zero includes an EEPROM which can be used for auto-configuration of the Linux environment if necessary.

The unit has an integrated MEMS microphone, can be used with stereo microphone input via 3.5mm socket and a mono speaker (1.2W / 8Ω).
The Codec Zero includes an EEPROM which can be used for auto-configuration of the Linux environment if necessary. It has an integrated MEMS microphone, and can be used with stereo microphone input via a 3.5mm socket and a mono speaker (1.2W/8Ω).

In addition to the green (GPIO23) and red (GPIO24) LEDs, a tactile programmable button (GPIO27) is also provided.

==== Pinouts
[cols="1,12"]
|===
| *P1/2* | Support external PHONO / RCA sockets if needed. P1: AUX IN, P2: AUX OUT.
| *P1/2* | Support external PHONO/RCA sockets if needed. P1: AUX IN, P2: AUX OUT.
| *P1* | Pin 1 is square.
|===
image::images/CODEC_ZERO_ZOOMED_IN_DIAGRAM.jpg[width="50%"]

A Codec Zero is an ideal design starting point for projects such as walkie-talkies, smart doorbells, vintage radio hacks, or smart speakers.
Codec Zero is an ideal design starting point for small-scale projects such as walkie-talkies, smart doorbells, vintage radio hacks, or smart speakers.