Texas Instruments CC1110-CC1111DK, User Manual

Page: 14 / 32

CC1110/CC2510
Page 14 of 31 swru134a
6.8 EM connectors
The EM connectors are used for connecting the EM to the SmartRF
®
04EB. The connectors
P1 and P2 are used as the main interface.
The EM should be used as an RF reference design with the Chipcon SoC, decoupling, and all
required RF circuitry. It is recommended to copy this reference design when designing
applications with Chipcon RF devices in order to achieve best RF performance.
Note that while it is physically possible to plug an EM not belonging to the SmartRF
®
04
product range into the SmartRF
®
04EB, the factory firmware and SmartRF
®
Studio do not
support the use of older devices. The SmartRF
®
04EB can be used with custom firmware for
prototyping using older Chipcon RF devices.
6.9 Signal flow
EM C
o
nne
c
tor
0 ohm
Peripheral
I/O Connector
Silabs USB
controller
Figure 7: Evaluation Board Signal flow
The signal lines from the EM connectors run via 0-ohm resistors to the USB MCU and the
various peripherals on the SmartRF
®
04EB. This allows connecting an EM module to other
applications. The USB MCU can be disconnected from the signal pins by removing the 0-ohm
resistors. The I/O connectors are located on the “outside” of the 0-ohm resistors, so they are
still connected to the EM connectors even if the 0-ohm resistors are removed. Please refer to
Table 1 on page 8 for a list of 0-ohm resistors and corresponding signals.
The SmartRF
®
04EB may not work with In-Circuit Emulator (ICE), SmartRF
®
Studio or the SW
examples when the 0-ohm resistors are removed.