The module J6 and J7 connectors interface to the expansion board through twin, high-density 100-pin connectors, J2 and J3, on the expansion board.

Caution:   The board-to-board connectors are rated for a maximum of 30 socketing cycles. You risk signal degradation after seating and removing the compute module more than 30 times.

Expansion Board Feature Highlights

The expansion board provides two 40-pin (0.1 x 0.1 pitch) breakout connectors that expose various features, power signals, and communication buses of the compute module. The expansion board also provides some standard, physical interface ports.

Some signals to and from the module are routed directly to the breakout connectors (J12 and J13) and physical ports; others receive level-conditioning when in transit on the board.

Component Description
Power input

Physical input connector, fused for current protection

Physical interfaces

Physical connectors for a number of module interfaces are provided by the expansion board:

  • Micro USB Type A
  • USB Type-C
  • Micro USB Type-B for serial debug (UART bridge)
  • Micro HDMI*
Level translation

The expansion board provides open collector type level translation and requires pullups on the attached mezzanine cards to the end-user’s desired voltage levels, not to exceed 3.3 VDC.

Voltage regulation

Expansion board provides additional voltage regulators to enable the level transition and conditioning devices.

Configuration jumpers

Header pins provide the ability to disable booting from the SD Card or from the eMMC image on the module.

 

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