User's Manual

JukeBlox Networked Media Modules – CX Series

Datasheet

SMSC CX Module 29 Revision 2.8 (09-30-12)

9.1.1 Power up, Reset and Power Down Timing

Time

Voltage

NRESET_MOD

+1.2V

+3.3V

< 300ms

>= 2ms

Power Up Power Down

9.2 RF Considerations

Note that overall system, RF and WiFi performance is significantly affected by the product design, environment and

the application. It is the responsibility of the product designer to ensure proper system level shielding (if required) and

to verify performance and fitness for the given product features and applications.

The WiFi performance will be affected by the RF environment surrounding the CX module. Please ensure that the CX

module is positioned in a “quiet” RF environment, as far away as possible from high frequency clock signals and any

other sources of RF energy. Also, make sure the antenna is not shielded by any metal objects, for example

loudspeakers or other metal parts. Please make sure that the power supplies, in particular the +1.9V supply, are quiet

and free from noise.

SMSC recommends that systems implementing AirPlay should use a module configuration that includes on-module

shielding, as well as paying particular attention to system configuration and shielding. In particular, SMSC is

recommending the use of the Bottom Shield versions of the modules, which allows greater freedom in antenna

positioning.

Also, please see the SMSC Application Note:

SMSCAppNote - CX870_Antenna_Placement_V1_4.pdf

regarding antenna positioning guidelines.

Please see below picture for the recommended keep out area and cable routing for the antennas.