Pi 2 Design – PI2AES-LITE
Hardware Reference Manual – P0.1 - 5/23/2022
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Table of Contents
1 Warranty ......................................................................................................................................................................................... 3
2 Operating Specifications ................................................................................................................................................................. 4
2.1 PI2AES-LITE Operating specifications .................................................................................................................................... 4
3 Overview ........................................................................................................................................................................................ 5
3.1 Introduction ............................................................................................................................................................................. 5
3.2 Block Diagram ......................................................................................................................................................................... 5
4 On-Board Devices .......................................................................................................................................................................... 7
4.1 Overview ................................................................................................................................................................................. 7
4.1 PI2AES-LITE I2C Bus Devices ................................................................................................................................................ 7
4.1 WM8804 SPDIF Transmitter .................................................................................................................................................... 7
4.1.1 WM8804 SPDIF Transmitter Notes .................................................................................................................................. 8
4.2 Dual High Resolution NDK Clocks ........................................................................................................................................... 8
5 RPi GPIO ........................................................................................................................................................................................ 9
5.1 Overview ................................................................................................................................................................................. 9
5.1.1 RPi GPIO Notes ............................................................................................................................................................. 10
6 PI2AES-LITE Power ..................................................................................................................................................................... 12
6.1 Overview ............................................................................................................................................................................... 12
7 PI2AES-LITE Software ................................................................................................................................................................. 13
7.1 Overview ............................................................................................................................................................................... 13
8 Top Side Connectors .................................................................................................................................................................... 14
8.1 Overview ............................................................................................................................................................................... 14
8.2 J1 - DC Jack .......................................................................................................................................................................... 16
8.3 J2 – BNC ............................................................................................................................................................................... 16
8.4 J3 - RCA ............................................................................................................................................................................... 16
8.1 U9 –Opto Transmitter ............................................................................................................................................................ 16
8.2 P1 – 40-Pin GPIO Header ..................................................................................................................................................... 16
8.3 W1 – 2.54MM Jumper Plug ................................................................................................................................................... 16
9 Document Revisions ..................................................................................................................................................................... 17
10 Errata.......................................................................................................................................................................................... 18
10.1 Overview ............................................................................................................................................................................. 18
List of Tables
Table 1 – PI2AES-LITE Operating Specifications .............................................................................................................................. 4
Table 2 – PI2AES-LITE I2C Bus Devices ........................................................................................................................................... 7
Table 3 – RPi to WM8804 Connections ............................................................................................................................................. 8
Table 4 – CPU GPIO Pin Assignments ............................................................................................................................................ 10
Table 5 – Document Revisions ........................................................................................................................................................ 17
List of Figures
Figure 1 – PI2AES-LITE Block Diagram............................................................................................................................................. 6
Figure 2 – PI2AES-LITE Power, Simplified Block Diagram .............................................................................................................. 12
Figure 3 – PI2AES-LITE Top View ................................................................................................................................................... 15
Figure 4 – PI2AES-LITE Side View (shown mounted on Raspberry Pi 4) ......................................................................................... 16
