Getting Started with EZ-BT WICED Modules
Document Number: 002-23400 Rev. **
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header open.
details the available power supply options and the associated header position connections
required.
Table 19. J8 Header Power Supply Connection Options
J8 Jumper Configuration
VDD Voltage Level
Short 1 & 2
3.6 V Supply
Short 2 & 3
3.3 V Supply
No Jumper (all headers open)
2.3 V Supply
All Other Configurations
Not Allowed
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Arduino-compatible base headers
– headers J3/J4/J6/J7: CYBT-353027-EVAL provides Arduino-compatible base
headers that can be used for Arduino shield connections. Associated signals that are routed out to these headers
are noted on the PCB silk screen on both the top and bottom side of the evaluation board.
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HCI UART direct connection header (J1): The J1 header provides all HCI UART communication lines to the user.
This allows for connection to the EZ-BT WICED Module without having to connect through USB. This can be used
to connect a host controller evaluation board directly to the EZ-BT WICED Module HCI UART connection. HCI
UART connections are not brought out to the Arduino-compatible headers. The J1 direct HCI UART connection
bypasses the SW4 (HCI UART to USB-to-UART bridge to Host PC) configuration. It is recommended that SW4
elements 1 ~ 4 are placed in the OFF position if the J1 direct HCI UART connection is used.
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Power consumption measurement header (J2): J2 is provided to allow for easy power consumption measurement
reading with a multimeter or current measurement probe. Refer to
for information related to low-
power implementations for the CYBT-353027-02 module as well as power consumption measurement methods
using the J2 header.
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User Element Disconnection Headers (J9 and J10): J9 (USER SW3) and J10 (USER D1 - LED) are provided to
allow for disconnection of these elements from the CYBT-353027-02 module. In both cases, the GPIO that is
routed to these USER elements are also routed to the Arduino-compatible headers. Disconnecting the elements
(SW3 and/or D1) may be required if you plan to use either of these GPIOs through the Arduino-compatible headers.
C . 2 . 3 S w i t c h e s a n d L E D s
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SW4 (HCI UART configuration switch): SW4 controls the connection of USB data traffic to the HCI UART
connections of the module. SW4 is a four-element switch (each element corresponding to the 4-wire UART signals
– TX, RX, CTS, RTS); used to connect the HCI UART signals on CYBT-353027-EVAL to the host PC USB
interface. To connect HCI UART signals from CYBT-353027-02 to the host PC, simply put each element of SW4
in the “On” position. To disconnect HCI UART communication from the CYBT-353027-02 module and the host PC,
simply set each of the SW4 elements to the Off position. There is no High-Z configuration available on the SW4
elements; only On or Off positions. Flow control is supported in hardware on the HCI UART connection.
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SW5 (Peripheral UART (PUART) configuration switch): SW5 controls the connection of the PUART signals of the
CYBT-353027-02 module to the host PC connection (via the USB/UART Bridge). SW5 is a four-element switch; to
connect PUART signals on CYBT-353027-EVAL to the host PC, simply
put each element of SW4 in the “On”
position. To disconnect PUART communication from the CYBT-353027-02 module and the host PC, simply set
each of the SW5 elements to the Off position. There is no High-Z configuration available on the SW5 elements;
only On or Off positions. PUART of the CYBT-353027-02 module supports only 2-wire UART interface. Flow
control is not supported on PUART of the CYBT-353027-02 module.
Note:
PUART connections from the CYBT-353027-02 module to the Arduino headers are not gated by SW5.
These connections are always present.
Notes on HCI UART and PUART configurations:
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It is acceptable to have SW4 and SW5 elements all set to the “On” position at the same time (i.e., HCI UART and
PUART both connected to the CYBT-353027-02 module). The PUART and HCI UART connections are handled
by two different hardware UART blocks, and the connection to the CYBT-353027-02 module from the USB-to-
UART bridge enumerates as two different COM ports on the host PC (not a shared connection/bus).
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Both HCI UART and PUART configurations can be used for UART communication within your application.
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HCI UART (Positions 1 ~ 4 of SW4 =
ON
) is the UART configuration generally used for interfacing to the WICED
Studio SDK, with the goal of downloading a compiled image to the EZ-BT WICED Module. The HCI UART
connection can also be used for general UART communication in Application mode (executing a downloaded
