SWRU493C July   2024  – January 2025 CC2564C

 

  1.   1
  2.   Trademarks
  3. 1Introduction to the CC256xCQFN-EM Board
    1. 1.1 Key Features
    2. 1.2 QFN EM Board Applications
  4. 2Module Description
  5. 3Module Detailed Description
    1. 3.1 Pin Description
      1. 3.1.1 Board Jumpers
        1. 3.1.1.1 Measuring Current Consumption
      2. 3.1.2 Antenna and U.FL Selector
      3. 3.1.3 RF Connectors
      4. 3.1.4 Debug Header
      5. 3.1.5 COM Connector
    2. 3.2 Clock Inputs
  6. 4Module Dimensions
  7. 5Tools and Software
    1. 5.1 TI's Bluetooth Software Solution
    2. 5.2 Evaluation Platforms
    3. 5.3 Bluetooth Hardware Evaluation Tool
  8. 6Certification
  9. 7Life Support Policy
  10. 8References
  11. 9Revision History

3.1.5 COM Connector

The COM connector, or edge card, is used to interface with TI's MPUs such as the AM437x and AM335x EVMs. As shown in Figure 3-3, the COM connector provides HCI, audio, slow clock, shutdown, and debug interfaces to the host connected through the edge card. All I/Os for the COM connector are at 1.8V. Some components must be DNI to use the COM connector. For more details, see the BOM.

COM Connector Pinout Figure 3-3 COM Connector Pinout

Table 3-5 lists the COM card pinout.

Table 3-5 COM CARD
Pin No. Relevant COM Connector Pin Assignment
1 SLOW_CLK_EDGE
8 1V8_IN
52 AUD_CLK_1V8
54 AUD_FSYNC_1V8
56 AUD_IN_1V8
58 AUD_OUT_1V8
66 HCI_TX_1V8
68 HCI_RX_1V8
70 HCI_CTS_1V8
72 HCI_RTS_1V8
76 TX_DEBUG_1V8
89 nSHUTDOWN_1V8

Pins 3, 9, 19, 37, 47, 63, 77, 83, 87, 95, and 97, as well as 2, 6, 18, 22, 42, 60, 64, and 92 are connected to ground.

All other pins are NC.

Some components must be removed (DNI) and R2 must be populated on the CC256XCQFN-EM to use the COM connector with the AM335x evaluation module (TMDXEVM3358) or similar Sitara EVM.

  • EM1, EM2, U2, U3, and U4 must be unpopulated (removed).
  • R2 (0 Ω) must be populated.

More information on the hardware changes required for the COM connector are in the CC256XCQFN-EM board design files (schematics and bill of materials).

CC256XCQFN-EM Hardware Modifications for COM Connector Figure 3-4 CC256XCQFN-EM Hardware Modifications for COM Connector