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Pi 2 Design CM4AES Hardware Reference Manual – P0.1

PAGE 1

Pi

2

Design

CM4AES

CM4 Digital Audio Carrier

Hardware Reference Manual

© 2021 PI 2 Design

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Summary of Contents for CM4AES

Page 1: ...Pi 2 Design CM4AES Hardware Reference Manual P0 1 PAGE 1 Pi 2 Design CM4AES CM4 Digital Audio Carrier Hardware Reference Manual 2021 PI 2 Design...

Page 2: ...er 13 6 1 Overview 13 6 2 Power Control 13 6 3 Power Status 14 6 4 Power Hold 14 7 CM4AES Software 15 7 1 Overview 15 8 Connector Locations 16 9 1 Overview 16 9 2 P1 Expansion I O Connector 17 9 4 P3...

Page 3: ...y and appropriate for a complex electronic device These conditions include proper temperature humidity radiation atmosphere and voltage standard commercial environment 0C to 70C 60 RH Any Product that...

Page 4: ...4AES conforms to the following specifications Specification Value Dimensions 170mm x 120mm Weight 10g Storage Temperature 20C to 85C Operating Temperature 0C to 70C Humidity 0 to 95 RH Non Condensing...

Page 5: ...t 0 INTERNAL HDMI A vertical HDMI connector allows access to CM4 HDMI Output 1 AES TRANSMITTER The industry standard WM8804 converts the CM4 I2S stream to AES3 SPDIF formatted data at 24 Bit up to 192...

Page 6: ...Header GPIO I2C I2S Slave Mode Raspberry Pi or Clone w 40 PIN GPIO Header 5V AP1155 LDO WM8804 24 Bit SPDIF Transmitter Master Mode I2S OUPUT I2C CONTROL Clock Select NDK NZ2520SD 22 792Mhz 50 OHM BN...

Page 7: ...encode OpenGL ES 3 0 graphics 4GB or 8GB LPDDR4 3200 SDRAM 2 4 GHz 5 0 GHz IEEE 802 11 b g n ac wireless Bluetooth 5 0 BLE Gigabit Ethernet PHY supporting IEEE 1588 PCIe 1 lane Host Gen 2 5Gbps USB 2...

Page 8: ...Select 24 576Mhz Input Clock for 48Khz 92Khz and 192Khz Frame Rates TXO AES3 SPDIF encoded digital audio output Table 3 CM4 to WM8804 Connections 4 4 1 WM8804 SPDIF TRANSMITTER NOTES 1 The WM8804 is...

Page 9: ...ex Connector This device is designed to drive the I2S Bus short distances 12 inches 4 8 I2S DIFFERENTIAL DRIVER A Quad Differential LVDS Driver takes the I2S Bus and converts each signal into a balanc...

Page 10: ...CM4 Activity LED_PWR LED2 Red LED Power Analog_IP0 1 Unused Camera_GPIO Unused EXT_RST RST Reset Out to Peripherals USB_P N USB2504A USB Host to USB2504A Hub USB_OTG_ID USEL Factory use only CAM0 1 U...

Page 11: ...Usage Description Notes 0 I O I2C0 PUP SDA0 Routed to P5 for DSI 0 1 I O I2C0 PUP SCL0 Routed to P5 for DSI 0 2 I O I2C1 PUP SDA I2C Data for CM4AES and Expansion 3 I O I2C1 PUP SCL I2C Clock for CM4A...

Page 12: ...to P17 26 IN PUP ROT_DT Rotary Data Switch Routed to P17 27 I O GPIO27 Routed to P1 Expansion Connector Table 5 CM4 Port and GPIO Pin Assignments 5 3 1 CM4 GPIO NOTES 3 DIR is from the point of view o...

Page 13: ...3 3V to NDK CLOCKS COMPUTE MODULE 4 TPS54560 3 3V 5A SWITCHING REGULATOR CM4AES POWER BLOCK DIAGRAM EXPANSION HEADER POWER PINS 3 3V to CM4AES POWER CONTROL Figure 2 CM4AES Power Simplified Block Dia...

Page 14: ...on off switch Note that for proper operation this circuit requires user software to program GPIO24 as an input with the internal pullup enabled 6 4 POWER HOLD GPIO22 PHLD allows the CM4 to hold the po...

Page 15: ...Due to the various resources interfaced on the CM4AES both internal and external to the CM4 it is necessary to initialize a large number of CPU registers and external devices before correct operation...

Page 16: ...VERVIEW This section provides the type location and pinout for the various connectors on the CM4AES Figure 4 CM4AES Connector Locations P15 I2S P11 BALANCED AES P10 AES U15 COAX OPTO P9 ETHERNET SD1 S...

Page 17: ...O20 10 PSW Power Enable Low True 11 RSVD Connected to CM4 GPIO27 12 RST Reset from CM4 13 RSVD Connected to CM4 GPIO4 14 RSVD Connected to CM4 GPIO5 15 GND Ground 16 SCL I2C Clock 17 SDA I2C Data 18 A...

Page 18: ...5V Switch Supply Pinout is Pin1 5V Pin 2 GND 9 8 P7 DUAL USB P7 is a standard Dual USB2 0 Host connector and conforms to the industry standard USB2 0 Pinout It is connected to the USB2504A USB Hub Po...

Page 19: ...cuit 9 GND Ground 10 VIN 19V to 28V Input from Input Power Circuit 11 GND Ground 12 VCC5 5V from On Board Switching Supply 13 GND Ground 14 VCC5 5V from On Board Switching Supply 15 GND Ground 16 VCC5...

Page 20: ...led low unless W1 Pin 2 3 Jumper In 17 GND Ground 18 W1 No Connect unless W1 Pin 1 2 Jumper In 19 NC No Connect Table 8 I2S Over HDMI Pinout 9 17 U15 COMBO RCA OPTO TRANSMITTER U15 is a Cliff OTJ6 tha...

Page 21: ...Pi 2 Design CM4AES Hardware Reference Manual P0 1 PAGE 21 9 DOCUMENT REVISIONS Date Revision Change 10 09 2021 P0 1 Preliminary Release Table 9 Document Revisions...

Page 22: ...Pi 2 Design CM4AES Hardware Reference Manual P0 1 PAGE 22 10 ERRATA 10 1 OVERVIEW There are currently no known errata for the CM4AES Rev P6...

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