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Pi 2 Design – PI2AES-LITE

Hardware Reference Manual – P0.1 - 5/23/2022

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Pi 2 Design

PI2AES-LITE

Digital Pro Audio Hat

Hardware Reference Manual

© 2022 PI 2 Design

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Summary of Contents for PI2AES-LITE

Page 1: ...Pi 2 Design PI2AES LITE Hardware Reference Manual P0 1 5 23 2022 PAGE 1 Pi 2 Design PI2AES LITE Digital Pro Audio Hat Hardware Reference Manual 2022 PI 2 Design ...

Page 2: ...verview 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...

Page 3: ...include proper temperature humidity radiation atmosphere and voltage standard commercial environment 0C to 70C 60 RH Any Product that has been modified without the express prior written consent of Pi 2 Design is not covered by this warranty The use or connection of any test or bus Connector adapter or component with any device other than a Pi 2 Design Connector or adapter shall void this warranty ...

Page 4: ...IFICATIONS 2 1 PI2AES LITE OPERATING SPECIFICATIONS The PI2AES LITE conforms to the following specifications Specification Value Dimensions 65mm x 56 5mm Weight 5g Storage Temperature 20C to 85C Operating Temperature 0C to 70C Humidity 0 to 95 RH Non Condensing Input Voltage VIN 5V 10 Power Consumption 250mw Typical 1W Maximum Table 1 PI2AES LITE Operating Specifications ...

Page 5: ...UTPUTS All output ports are active with the same Digital Audio Data Bit Depth and Frame Rate at the same time No further configuration required AES COAX OUTPUT A 1 1 Isolation Transformer provides Bit Perfect Impedance Controlled Coaxial Transmission of the Digital Audio Data SPDIF OUTPUT A 1 1 Isolation Transformer provides Bit Perfect Transmission of the Digital Audio Data via RCA Jack SPDIF OPT...

Page 6: ... 40 PIN GPIO Header 5V LT3042 LDO WM8804 24 Bit SPDIF Transmitter Master Mode I2S OUPUT I2C CONTROL Clock Select NDK NZ2520SD 22 792Mhz RCA 2 5MM DC Jack Over Voltage Protection 1 1 Isolation Transformer 1 1 Isolation Transformer SPDIF OUTPUT MCLK IN 40 Pin Socket NDK NZ2520SD 24 576Mhz LT3042 LDO TOSLINK OPTO 5V Buffer BNC JUMPER Figure 1 PI2AES LITE Block Diagram ...

Page 7: ...us 7 Bit I2C Address Description I2C 0x3B WM8804 SPDIF Transmitter Table 2 PI2AES LITE I2C Bus Devices 4 1 WM8804 SPDIF TRANSMITTER At the core of the PI2AES LITE is the Cirrus Logic WM8804 AES Digital Audio Transmitter This device interfaces to the Raspberry Pi via I2S and I2C The signals used to interface with the WM8804 are shown in the following table WM8804 Signal RPi Signal Description MCLK ...

Page 8: ...igned 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 Serial Data in is received from Pi 3 Pi GPIO s 6 and 13 are used to select the desired clock input GPIO 6 and 13 are pulled low by default CAUTION Do not select more than one clock at a time 4 2 DUAL HIGH RESOLUTION NDK CLOCKS A pair of NDK NZ2520SD ...

Page 9: ...IN DIR AF PUP PDN PI2AES LITE Name Description Notes 1 RPi 3 3V Unused 2 5V 5V Power to from the RPi 3 I O Y PUP I2C_SDA I2C Bus Data 4 5V 5V Power to from the RPi 5 OUT Y PUP I2C_SCL I2C Bus Clock 6 GND 7 OUT GPIO4 Unused 8 GPIO14 Unused 9 GND Unused 10 GPIO15 Unused 11 GPIO17 Unused 12 IN Y BCLK I2S Bit Clock from WM8804 13 GPIO27 Unused 14 GND 15 GPIO22 Unused 16 GPIO23 Unused 17 RPi 3 3V Used ...

Page 10: ...13 Unused 34 GND 35 IN Y LRCLK I2S Left Right Clock from WM8804 36 GPIO16 Unused 37 GPIO26 Unused 38 GPIO20 Unused 39 GND 40 OUT Y SDOUT Pi I2S Serial Audio Data Out Table 4 CPU GPIO Pin Assignments 5 1 1 RPI GPIO NOTES 1 DIR is from the point of view of the RPi 2 Y in the Alternate Function AF column indicates that the use of this pin requires the pin to be assigned to the function as defined by ...

Page 11: ...Pi 2 Design PI2AES LITE Hardware Reference Manual P0 1 5 23 2022 PAGE 11 ...

Page 12: ...e powered first for proper operation Note that an on board protection circuit ensures proper operation when jumper W2 is installed while power is applied via J1 AND from the PI P1 simultaneously In this instance whichever voltage rail is higher supplies the power See the below block diagram for a simplified view of the PI2AES LITE power J1 2 5MM JACK RESETABLE POLY FUSE OPTIONAL 5V INPUT 58V OVERP...

Page 13: ...nterfaced 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 For most Raspberry Pi Software Volumio Moode Ropiee etc the HifiBerry Digi Pro driver can be selected There are no additional options be...

Page 14: ...PAGE 14 8 8 8 8 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 15: ...Pi 2 Design PI2AES LITE Hardware Reference Manual P0 1 5 23 2022 PAGE 15 Figure 3 PI2AES LITE Top View W2 J1 2 5MM DC JACK U9 OPTO J2 BNC J3 RCA P1 ...

Page 16: ...e level is 1 0V 8 4 J3 RCA This jack is designed to carry the SPDIF COAX Digital Audio Signal Voltage level is 0 6V 8 1 U9 OPTO TRANSMITTER U9 is a Toslink Transmitter for SPDIF Optical Digital Audio output 8 2 P1 40 PIN GPIO HEADER This is a standard 40 Pin 1 Dual Row Female Header It is designed to accept a Raspberry Pi single board and conforms to the standard Raspberry Pi 40 Pin GPIO Header pi...

Page 17: ...LITE Hardware Reference Manual P0 1 5 23 2022 PAGE 17 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 18: ...Pi 2 Design PI2AES LITE Hardware Reference Manual P0 1 5 23 2022 PAGE 18 10 10 10 10 ERRATA ERRATA ERRATA ERRATA 10 1 OVERVIEW There are currently no known errata for the PI2AES LITE Rev P1 ...

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