VMAC v2 specification overview:
- Full size quality two layer Raspberry Pi Hat board to HAT mechanical specification
- Suitable for Raspberry PI 2, 3 or Zero Models Raspberry Family
- Size 85mm x 56mm
- Weight: PCB with connectors 40g, PCB without connectors 20g
- Standard 40 pin Pi GPIO header
- All logic I/O (GPIO), levels are at 3v3
- Impedance Video 75 Ohms and Audio 600 Ohms (Line Level)
- Programmable individual Video input Clamp, Bias and Gain
- 9 x AV Inputs to Matrix
- 6 x RCA Sockets – Component configurable for Video or Audio Inputs
- 3.5mm Jack Socket providing (Used to loopback from Pi 3.5mm Socket)
- 1 x video Input
- 2 x audio Inputs
- 4 x AV Outputs from Matrix
- 4 x RCA Sockets – Component configurable for Video or Audio Outputs
- Pi Zero video connector Pin Header
- 4 x matrix logic control inputs
- Connected to GPIO on Pi GPIO header
- FET switched output (Intended for PTT)
- Connected via GPIO on Pi GPIO header
- PiHat powered from on-board 3V3 regulator
- Taking 5V from Pi Header
- DTMF decoder (CM88L80)
- Logic outputs to GPIO on Pi GPIO header
- Level control preset on PCB
- OSD (MAX7456)
- Controlled from SPI on Pi GPIO header
- 3 x Video Signal Detectors (MAX7461)
- Connected to AV Inputs 1, 2 and 3
- Logic outputs to GPIO on Pi GPIO header
- 4 x On-board LEDs. 3v3 Power, User, Status and PTT
- EEPROM
- Optionally connected to either E2 ID, or I2C, on Pi GPIO header
- UART TXD, RXD and RTS
- Connected to GPIO on Pi GPIO header
- RTS is also connected to a LED, allowing multiple use
- Two PiHat boards may be stacked for increased A/V IO count
- Require to unpopulate DTMF on 2nd board
- Require to clear EEPROM solder jumper on 2nd board
- Change matrix I2C address via solder jumper on 2nd board
- Eleven test points on PCB for expansion, testing or other uses
- Mounting holes
- Suitable for Raspberry PI 2, 3 or Zero risers
- Component Temperature Range 0°C to 85°C
- Operating Temperature Range 0°C to 45°C
- Air movement over PCB is advisable at high temperatures