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Summary of Contents for PI 2 Design PI2AES-LITE
- Page 1 Pi 2 Design – PI2AES-LITE Hardware Reference Manual – P0.1 - 5/23/2022 Pi 2 Design PI2AES-LITE Digital Pro Audio Hat Hardware Reference Manual © 2022 PI 2 Design PAGE 1...
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Page 2: Table Of Contents
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 PAGE 2... -
Page 3: 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 4: Operating Specifications
Pi 2 Design – PI2AES-LITE Hardware Reference Manual – P0.1 - 5/23/2022 2 2 2 2 OPERATING OPERATING OPERATING S S S S PECIFICATIONS OPERATING PECIFICATIONS PECIFICATIONS PECIFICATIONS 2.1 PI2AES-LITE OPERATING SPECIFICATIONS The PI2AES-LITE conforms to the following specifications: Specification... -
Page 5: Overview
AES TRANSMITTER – The industry standard WM8804 converts the PI I2S stream to AES3/SPDIF • formatted data at 24-Bit up to 192Khz Frame Rate. The PI2AES-LITE works with the industry standard WM8804 w/multiple clocks, Linux driver. MULTIPLE SIMULTANEOUS OUTPUTS – All output ports are active with the same Digital Audio •... -
Page 6: Figure 1 - Pi2Aes-Lite Block Diagram
Pi 2 Design – PI2AES-LITE Hardware Reference Manual – P0.1 - 5/23/2022 Over-Voltage Protection 2.5MM JUMPER DC Jack LT3042 LT3042 Clock Select TOSLINK NDK NZ2520SD OPTO 24.576Mhz NDK NZ2520SD 22.792Mhz 1:1 Isolation GPIO Transformer I2S (Slave Mode) MCLK IN I2S OUPUT... -
Page 7: On-Board Devices
PI2AES-LITE. 4.1 PI2AES-LITE I2C BUS DEVICES The following table describes the CPU I2C Bus usage of the PI2AES-LITE. Most of these addresses are set by the startup script supplied by Pi2Design. Refer to the respective device documentation for more detail. -
Page 8: 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-LITE 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 9: Rpi Gpio
5 5 5 5 R R R R PI PI PI PI GPIO GPIO GPIO GPIO 5.1 OVERVIEW The PI2AES-LITE 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 10: Rpi Gpio Notes
Pi 2 Design – PI2AES-LITE Hardware Reference Manual – P0.1 - 5/23/2022 PUP/ PI2AES- Description/Notes LITE Name GPIO25 Unused 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... - Page 11 Pi 2 Design – PI2AES-LITE Hardware Reference Manual – P0.1 - 5/23/2022 PAGE 11...
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Page 12: Pi2Aes-Lite Power
POWER 6.1 OVERVIEW The PI2AES-LITE is designed to be powered the Raspberry PI +5V Pins. Optionally, external 5V can be used, such as Linear Power Supplies. When jumper W2 is removed, separate 5V power must be supplied to the Raspberry PI. Note that when the PI2AES-... -
Page 13: Pi2Aes-Lite Software
SOFTWARE 7.1 OVERVIEW Due to the various resources interfaced on the PI2AES-LITE, 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. These values and their proper sequencing are beyond the scope of this document. -
Page 14: Top Side Connectors
TOP SIDE CONNECTORS TOP SIDE CONNECTORS TOP SIDE CONNECTORS 8.1 OVERVIEW This section provides the type, location, and pinout for the various connectors on the PI2AES-LITE. Top View and Side View are shown in the following 3D renders. PAGE 14... -
Page 15: Figure 3 - Pi2Aes-Lite Top View
Pi 2 Design – PI2AES-LITE Hardware Reference Manual – P0.1 - 5/23/2022 OPTO 2.5MM DC JACK Figure 3 – PI2AES-LITE Top View PAGE 15... -
Page 16: J1 - Dc Jack
Pi 2 Design – PI2AES-LITE Hardware Reference Manual – P0.1 - 5/23/2022 J2 – AES SPDIF COAX 2.5MM TOSLINK DC JACK Figure 4 – PI2AES-LITE Side View (shown mounted on Raspberry Pi 4) 8.2 J1 - DC JACK This jack is designed to accept a 5.5mm x 2.5mm center positive plug for external power in. -
Page 17: Document Revisions
Pi 2 Design – PI2AES-LITE Hardware Reference Manual – P0.1 - 5/23/2022 9 9 9 9 DOCUMENT REVISIONS DOCUMENT REVISIONS DOCUMENT REVISIONS DOCUMENT REVISIONS Date Revision Change 05/22/2022 P0.1 Preliminary Release Table 5 – Document Revisions PAGE 17... -
Page 18: Errata
Pi 2 Design – PI2AES-LITE Hardware Reference Manual – P0.1 - 5/23/2022 10 10 10 10 ERRATA ERRATA ERRATA ERRATA 10.1 OVERVIEW There are currently no known errata for the PI2AES-LITE Rev. P1. PAGE 18...
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