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SWRU495C March 2020 – December 2021 CC2564C

5.1 EM Connector Settings

The CC256XCQFN-EM can be mounted on TI MCU platforms such as the MSP-EXP432P401R using the BOOST-CCEMADAPTER. The CC256XCQFN-EM EM1/EM2 connectors can also be used with the CC256XEM-STADAPT to mount the CC256XCQFN-EM on other MCU platforms.

All EM I/Os are at 3.3-V levels. Pin assignments are described with respect to the front (CC2564C) side. For example, MODULE_UART_RX refers to the receiving UART RX pin on the CC256xC device that connects to the UART_TX pin on the MCU.

Table 5-1 describes the standard pinout for EM1.

Table 5-1 EM1 Standard Pinout

Pin	EM Adapter Assignment⁽¹⁾	Pin	EM Adapter Assignment⁽¹⁾
1	GND	2	NC
3	MODULE_UART_CTS	4	NC
5	SLOW_CLK	6	NC
7	MODULE_UART_RX	8	NC
9	MODULE_UART_TX	10	NC
11	NC	12	NC
13	NC	14	NC
15	NC	16	NC
17	NC	18	NC
19	GND	20	NC

(1) NC = not connected

Table 5-2 describes the standard pinout for EM2.

Table 5-2 EM2 Standard Pinout

Pin	EM Adapter Assignment⁽¹⁾	Pin	EM Adapter Assignment⁽¹⁾
1	NC	2	GND
3	NC	4	NC
5	NC	6	NC
7	3.3 V	8	MODULE_AUDIO_DATA_OUT
9	3.3 V	10	MODULE_AUDIO_DATA_IN
11	MODULE_AUDIO_FSINK	12	NC
13	NC	14	NC
15	NC	16	NC
17	MODULE_AUDIO_CLK	18	MODULE_UART_RTS
19	nSHUTD	20	NC

(1) NC = not connected

For complete evaluation of the audio applications with the MSP432 LaunchPad and STM32 Evaluation boards, the level shifter U4 must be properly configured to ensure proper direction of PCM signals.

When using CC256XC as PCM master:
- R19 must be populated with a 10K Ω resistor.
- R18 and R11 must be unpopulated (removed).
When using CC256XC as PCM slave:
- R18 must be populated with a 0Ω resistor.
- R19 and R11 must be unpopulated (removed).

More information on the hardware changes required for PCM signals on EM connectors is in the Dual-Mode Bluetooth CC2564C Evaluation Board User's Guide and the CC256XCQFN-EM board design files (schematics and bill of materials).