Device Interface:
In this approach Common Processor PCB have a footprint PG‐USON‐8‐1. Apple authentication device will not
be assembled to this footprint by default.
Required I2C0, Power, Reset and Ground signals from J721E SoC is routed to this footprint, as shown in Table
4-28.
Table 4-28. APPLE AUTH Footprint U108 Pinout
Pin No Signal Description
6 I2C0_SCL I2C slave interface, clock connection
2 I2C0_SDA I2C slave interface, data connection
7 APPLE_AUTH_RSTz Reset, Active low
8 VSYS_IO_3V3 Power 3.3 V
1, 9 DGND Ground
3,4,5 NC Not Connected
4.24 EVM Expansion Connectors
The Common processor board includes an Expansion connector of QSH-060-01-L-D-A-K with 5mm mating
height allowing multiple expansion boards (Infotainment or GESI Expansion) to be stacked below the processor
board.
Either Infotainment or GESI Expansion board can be plugged into EVM expansion connectors (J46 and J51) at
once.
Figure 4-43. Expansion Board Interface Connectors
www.ti.com J721E EVM Hardware Architecture
SPRUIS4D – MAY 2020 – REVISED MARCH 2022
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Jacinto7 J721E/DRA829/TDA4VM Evaluation Module (EVM) 73
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