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Summary of Contents for PI 2 Design Pi 2 Media PI2AES
- Page 1 PI2Media PI2AES Hardware Reference Manual – P3.4 - 06/02/2020 Pi Pi Pi 2 2 2 Media Media Media PI2AES Digital Pro Audio Hat Hardware Reference Manual © 2019 PI 2 Design PAGE 1...
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Page 2: Table Of Contents
PI2Media PI2AES Hardware Reference Manual – P3.4 - 06/02/2020 Table of Contents 1 Warranty ........................................4 2 Operating Specifications ..................................5 2.1 PI2AES Operating specifications..............................5 3 Overview........................................6 3.1 Introduction ....................................6 3.2 Block Diagram....................................6 4 On-Board Devices ....................................8 4.1 Overview ......................................8 4.1 PI2AES I2C Bus Devices................................8 4.1 WM8804 SPDIF Transmitter................................8 4.1.1 WM8804 SPDIF Transmitter Notes ............................9 4.2 Dual High Resolution NDK Clocks ..............................9... - Page 3 PI2Media PI2AES Hardware Reference Manual – P3.4 - 06/02/2020 List of Figures Figure 1 – PI2AES Block Diagram ..............................7 Figure 2 – PI2AES Power, Simplified Block Diagram ..........................12 PAGE 3...
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Page 4: Warranty
This warranty is valid only for so long as the product is used intact as shipped from PI 2 Design. Any attempt or effort to alter the Product, including but not limited to any attempt to solder, de-solder, unplug, replace, add or affix any part or component of... -
Page 5: Operating Specifications
PI2Media PI2AES Hardware Reference Manual – P3.4 - 06/02/2020 2 2 2 OPERATING SPECIFICATIONS OPERATING SPECIFICATIONS OPERATING SPECIFICATIONS 2.1 PI2AES OPERATING SPECIFICATIONS The PI2AES conforms to the following specifications: Specification Value Dimensions 85mm x 56.5mm Weight ~10g Storage Temperature -20C to +85C Operating Temperature 0C to +70C Humidity... -
Page 6: Overview
OVERVIEW 3.1 INTRODUCTION The PI2AES, designed and manufactured by PI 2 Design, is a professional I/O Shield designed to bring Professional Studio Grade Audio to the Raspberry PI ® family of Single Board Computers. This low-cost Shield converts the Raspberry Pi ® I2S Interface to High Definition Digital Audio Coax, OPTO and Balanced XLR. - Page 7 PI2Media PI2AES Hardware Reference Manual – P3.4 - 06/02/2020 Figure 1 – PI2AES Block Diagram PAGE 7...
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Page 8: On-Board Devices
PI2Media PI2AES Hardware Reference Manual – P3.4 - 06/02/2020 4 4 4 ON-BOARD DEVICES ON-BOARD DEVICES ON-BOARD DEVICES OVERVIEW The PI2AES interfaces to the RPi via the 40-Pin GPIO Connector. This section describes in detail the devices located on the PI2AES. 4.1 PI2AES I2C BUS DEVICES The following table describes the CPU I2C Bus usage of the PI2AES. -
Page 9: Wm8804 Spdif Transmitter Notes
4.1.1 WM8804 SPDIF TRANSMITTER NOTES 1. The WM8804 is controlled using the I2C port. Refer to the WM8804 documentation and Pi 2 Design supplied driver code for more detail. 2. The PI2AES is designed to operate the WM8804 in Master mode. In this mode the WM8804 receives its master clock from XIN and drives MCLK (unused), BCLK and LRCLK to the Pi. -
Page 10: Rpi Gpio
PI2Media PI2AES Hardware Reference Manual – P3.4 - 06/02/2020 5 5 5 RPI RPI GPIO GPIO GPIO 5.1 OVERVIEW The PI2AES uses a number of signals from the RPi GPIO header for control and status purposes. This usage is defined in the following table. PUP/ PI2AES Description/Notes... -
Page 11: Rpi Gpio Notes
PI2Media PI2AES Hardware Reference Manual – P3.4 - 06/02/2020 PUP/ PI2AES Description/Notes Name GPIO11 Unused GPIO8 Unused GPIO1 Unused ID_SDA Unused ID_SCL Unused GPIO5 1 = Select 22.5792Mhz Clock Input to WM8804 GPIO6 1 = Select 24.576Mhz Clock Input to WM8804 GPIO12 Unused GPIO13... -
Page 12: Pi2Aes Power
PI2Media PI2AES Hardware Reference Manual – P3.4 - 06/02/2020 6 6 6 PI2AES POWER PI2AES POWER PI2AES POWER 6.1 OVERVIEW The PI2AES is designed to be powered from an external +24V to +48V source. Jumper W2, when installed, allows the Raspberry PI to be powered from the PI2AES. When jumper W2 is removed, separate 5V power must be supplied to the Raspberry PI. -
Page 13: Pi2Aes Software
PI2Media PI2AES Hardware Reference Manual – P3.4 - 06/02/2020 7 7 7 PI2AES SOFTWARE PI2AES SOFTWARE PI2AES SOFTWARE 7.1 OVERVIEW Due to the various resources interfaced on the PI2AES, both internal and external to the RPi, it is necessary to initialize a large number of CPU registers and external devices before correct operation can begin. -
Page 14: Pi2Aes Connectors
PI2Media PI2AES Hardware Reference Manual – P3.4 - 06/02/2020 8 8 8 PI2AES CONNECTORS PI2AES CONNECTORS PI2AES CONNECTORS 8.1 OVERVIEW This section provides the type, location and pinout for the various connectors on the PI2AES. Top View is shown in the following 3D render. PAGE 14... - Page 15 PI2Media PI2AES Hardware Reference Manual – P3.4 - 06/02/2020 RCA COAX BALANCED AES XLR J2 BNC AND OPTO 2.5MM DC JACK P4 – I2S OVER HDMI P3 – I2S EXPANSION HEADER PIN 1 PIN 16 PAGE 15...
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Page 16: J1 - Dc Jack
PI2Media PI2AES Hardware Reference Manual – P3.4 - 06/02/2020 8.2 J1 – DC JACK This jack is designed to accept a 5.5mm x 2.5mm center positive plug for external power in. Voltage must be +24V to +48V. 8.3 J2 – BNC This 75 Ohm Jack is used to transmit Single Ended AES digital audio output. -
Page 17: P3 - Xlr Balanced Output
PI2Media PI2AES Hardware Reference Manual – P3.4 - 06/02/2020 8.1 P3 – XLR BALANCED OUTPUT P3 is a 3-Pin XLR Connector. This 110-ohm connector carries the AES balanced digital audio output. 8.2 P4 – I2S OVER HDMI P4 is a standard HDMI Connector that carries the Differential I2S signal. The Pinout for P4 is shown in the following table. -
Page 18: U9 - Combo Rca/Opto Transmitter
PI2Media PI2AES Hardware Reference Manual – P3.4 - 06/02/2020 W1 PINS Name Description, Jumper In Enable +5V to Pin 18 of the HDMI Connector P4 I2C_SD Enable I2C Data to Pin 15 of the HDMI Connector P4 I2C_SCL Enable I2C Clock to Pin 15 of the HDMI Connector P4 8.4 U9 –... -
Page 19: Document Revisions
PI2Media PI2AES Hardware Reference Manual – P3.4 - 06/02/2020 9 9 9 DOCUMENT REVISIONS DOCUMENT REVISIONS DOCUMENT REVISIONS Date Revision Change 03/26/2019 P0.1 Preliminary Release 06/02/2019 P2.0 Design Revision P2 Initial Release 08/15/2019 P3.0 Design Revision P3 Initial Release Added description of I2S over HDMI option block W1 08/16/2019 P3.1 Added entry for HifiBerry Digi+ Pro compatibility... -
Page 20: Errata
PI2Media PI2AES Hardware Reference Manual – P3.4 - 06/02/2020 10 10 10 ERRATA ERRATA ERRATA 10.1 OVERVIEW Below is the current known errata for the PI2AES Rev. P3.x: 1. This revision changes no circuitry, but clarifies the required voltage range. It is now +24V to +48V.
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