Texas Instruments CC3235 SimpleLink Series User manual

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CC3235x SimpleLink™ Wi-Fi®LaunchPad™ Development Kit (LAUNCHXL-
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User's Guide
SWRU539–January 2019
CC3235x SimpleLink™ Wi-Fi®LaunchPad™
Development Kit (LAUNCHXL-CC3235x)
The CC3235 SimpleLink™ LaunchPad™ Development Kit (LAUNCHXL-CC3235x) is a low-cost
evaluation platform for Arm®Cortex®-M4-based MCUs. The LaunchPad (LP) design highlights the
CC3235 Dual Band (2.4 GHz and 5 GHz) wireless MCU system on a chip. The CC3235 LaunchPad™ kit
also features temperature and accelerometer sensors, programmable user buttons, RGB LED for custom
applications, and onboard emulator for debugging. The stackable headers of the LAUNCHXL-CC3235x
demonstrate how easy it is to expand the functionality of the LaunchPad™ kit. BoosterPack™ Plug-in
Modules allow for interfacing with other peripherals such as graphical displays, audio codecs, antenna
selection, environmental sensing, and more.
The CC3235S and CC3235SF devices are part of the SimpleLink™ microcontroller (MCU) ecosystem
which consist of Wi-Fi®, Bluetooth®low energy, Sub-1 GHz and host MCUs. All share a common, easy-to-
use development environment with a single core software development kit (SDK) and a rich tool set. A
one-time integration of the SimpleLink™ platform lets you add any combination of devices from the
portfolio into your design. The ultimate goal of the SimpleLink™ platform is to achieve 100% code reuse
when your design requirements change. For more information, visit www.ti.com/SimpleLink.
Contents
1 Introduction ................................................................................................................... 3
1.1 CC3235x LaunchPad™ Development Kit ....................................................................... 3
1.2 Key Features ........................................................................................................ 3
1.3 Kit Contents.......................................................................................................... 3
1.4 Regulatory Compliance ............................................................................................ 4
2 Hardware Description ....................................................................................................... 5
2.1 Block Diagram....................................................................................................... 6
2.2 Hardware Features ................................................................................................. 7
2.3 Connecting a BoosterPack™ ..................................................................................... 8
2.4 Wired Connections, Jumper Settings, Buttons, and LEDs .................................................... 9
2.5 Power ............................................................................................................... 18
2.6 Isolated Current Measurement of the CC3235 Device....................................................... 21
2.7 RF Connections ................................................................................................... 23
2.8 Assembly Drawing ................................................................................................ 25
List of Figures
1 CC3235 LaunchPad™ Board Overview.................................................................................. 5
2 CC3235 LaunchPad™ Block Diagram.................................................................................... 6
3 Pin 1 Marking on CC3235 LaunchPad™ (3v3 Tag) .................................................................... 8
4 Default Jumper Configuration for JTAG Lines........................................................................... 9
5 JTAG IN Connector........................................................................................................ 10
6 I2C Connections ............................................................................................................ 11
7 Power Jumpers J28, J23, J24, J18, J21, and J22..................................................................... 12
8 External Supply Connections and LED Enable Jumper............................................................... 13
9 SOP Jumpers (Default Setting Shown) ................................................................................. 14
10 UART Routed to USB COM Port......................................................................................... 15
11 UART Routed to 20-Pin Header Connector ............................................................................ 15
12 CC3235 BoosterPack™ Header Pin Assignments .................................................................... 17

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13 Powering From USB Jumper Settings................................................................................... 18
14 CC3235 LaunchPad™ Powered by Battery ............................................................................ 19
15 Only CC3235 Device and Serial Flash Powered by Battery ......................................................... 20
16 Low-Current Measurement (<1 mA)..................................................................................... 21
17 Active Power Measurements (>1 mA)................................................................................... 22
18 Using Onboard Antenna (Default Condition) ........................................................................... 23
19 Board Modified for External Antenna Connections (Measure 2.4 GHz) ............................................ 23
20 Board Modified for External Antenna Connections (Measure 2.4 GHz or 5 GHz)................................. 24
21 CC3235SF LaunchPad™ Top-Layer Assembly Drawing............................................................. 25
22 CC3235S LaunchPad™ Top-Layer Assembly Drawing............................................................... 26
List of Tables
1 JTAG Header Pin Definitions............................................................................................... 9
2 I2C Jumper Definitions..................................................................................................... 11
3 Default I2C Addresses (of Onboard Sensors) .......................................................................... 11
4 Jumper Settings for LaunchPad™ Power............................................................................... 12
5 External Supply Connections and LED Enable Jumper............................................................... 13
6 Reset Pull-Up Jumper ..................................................................................................... 13
7 J15, J16, J17 on LaunchPad™........................................................................................... 14
8 Push-Button Definitions ................................................................................................... 16
9 LED Indicators.............................................................................................................. 16
Trademarks
SimpleLink, LaunchPad, BoosterPack, Internet-on-a chip, Code Composer Studio, Texas Instruments,
Tiva are trademarks of Texas Instruments.
IAR Embedded Workbench is a registered trademark of Texas Instruments.
Arm, Cortex are registered trademarks of Arm Limited.
Bluetooth is a registered trademark of Bluetooth SIG, Inc..
Wi-Fi is a registered trademark of Wi-Fi Alliance.

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1 Introduction
1.1 CC3235x LaunchPad™ Development Kit
Created for the Internet of Things (IoT), the SimpleLink™ Wi-Fi®CC3235 device is a single-chip
microcontroller (MCU) with built-in Wi-Fi®connectivity for the LaunchPad™ ecosystem, which integrates a
high-performance Arm®Cortex®-M4 MCU and lets customers develop an entire application with one
device. With on-chip Wi-Fi®, Internet, and robust security protocols, no prior Wi-Fi®experience is required
for fast development.
The CC3235 LaunchPad™ kit, referred to by its part number LAUNCHXL-CC3235x, is a low-cost
evaluation platform for Arm®Cortex®-M4-based MCUs. The LaunchPad™ design highlights the CC3235
Internet-on-a chip™ solution and Wi-Fi®capabilities. The CC3235 LaunchPad™ also features temperature
and accelerometer sensors, programmable user buttons, RGB LED for custom applications, and onboard
emulation for debugging. The stackable headers of the CC3235 LaunchPad™ XL interface demonstrate
how easy it is to expand the functionality of the LaunchPad™ when interfacing with other peripherals on
many existing BoosterPack™ add-on boards, such as graphical displays, audio codecs, antenna selection,
environmental sensing, and more. There are two variants of the LaunchPad™: LAUNCHXL-CC3235S and
LAUNCHXL-CC3235SF. This user's guide applies to both variants, and any differences are noted in
relevant sections.
Multiple development environment tools are also available, including the Eclipse-based Code Composer
Studio™ (CCS) integrated development environment (IDE) and IAR Embedded Workbench®from Texas
Instruments™. More information about the LaunchPad™, the supported BoosterPack™ modules, and the
available resources can be found at the LaunchPad™ portal from TI. Also, visit the CC3235 Wiki page for
design resources and example projects.
NOTE: The maximum RF power transmitted in each WLAN 2.4-GHz band is 18.3 dBm. The
maximum RF power transmitted in each WLAN 5-GHz band is 17 dBm.
The antennas used for this transmitter must be installed to provide a separation distance of
at least 20 cm from all people, and must not be colocated or operating in conjunction with
any other antenna or transmitter.
1.2 Key Features
• CC3235x Dual Band (2.4GHz and 5GHz) SimpleLink™ Wi-Fi®, Internet-on-a chip™ solution with
integrated MCU
• 40-pin LaunchPad™ pinout that leverages the BoosterPack™ ecosystem
• on-board XDS110-based JTAG emulation with serial port for flash programming
• Two buttons and RGB LED for user interaction
• Back-channel universal asynchronous receiver/transmitter (UART) through USB to PC
• Onboard chip antenna with U.FL connector for conducted testing
• Onboard accelerometer and temperature sensor
• Micro USB connector for power and debug connections
1.3 Kit Contents
• CC3235 LaunchPad™ development tool (LAUNCHXL-CC3235x)
• Micro USB cable
• Quick Start Guide

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1.4 Regulatory Compliance
The SimpleLink™ CC3235x Wi-Fi®LaunchPads™ are tested for and found to be in compliance with FCC
and ISED regulations regarding unlicensed intentional radiators. Hereby, Texas Instruments Inc. declares
that the radio equipment type LAUNCHXL-CC3235S and LAUNCHXL-CC3235SF are in compliance with
Directive 2014/53/EU. The full text of the EU declaration of conformity is available at the following internet
addresses:
•LAUNCHXL-CC3235x Certification Documents
•LAUNCHXL-CC3235S Declaration of Conformity
•LAUNCHXL-CC3235SF Declaration of Conformity
Indoor Usage Restrictions:
The device is restricted to indoor use only when operating in the 5150 to 5350 MHz frequency range.
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2 Hardware Description
Figure 1 shows the CC3235 LaunchPad™ board.
Figure 1. CC3235 LaunchPad™ Board Overview

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2.1 Block Diagram
Figure 2 shows the CC3235 LaunchPad™ block diagram.
Figure 2. CC3235 LaunchPad™ Block Diagram

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2.2 Hardware Features
• CC3235 SimpleLink™ Wi-Fi®, Internet-on-a chip™ solution with integrated MCU
• 40-pin LaunchPad™ standard that leverages the BoosterPack™ ecosystem
• TI Standard XDS110-based JTAG emulation with serial port for flash programming
• Supports both 4-wire JTAG and 2-wire SWD
• Two buttons and a RGB LED for user interaction
• Virtual COM port UART through USB on PC
• Onboard chip antenna with U.FL or SMA for conducted testing, selectable using 0-Ωresistors
• Onboard accelerometer and temperature sensor for out-of-box demo, with the option to isolate them
from the inter-integrated circuit (I2C) bus
• Micro USB connector for power and debug connections
• Headers for current measurement and external JTAG connection, with an option to use the onboard
XDS110 to debug customer platforms
• Bus-powered device, with no external power required for Wi-Fi®
• Long-range transmission with a highly optimized antenna (200-meter typical in open air with a 6-dBi
antenna AP)
• Can be powered externally, working down to 2.3 V (typical)

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2.3 Connecting a BoosterPack™
A compatible BoosterPack™ can be stacked on top of the LaunchPad™ using the 2-pin × 20-pin
connectors. The connectors do not have a key to prevent misalignment of the pins or reverse connection.
For ease of use, a BoosterPack™ Checker tool can be used to verify if the LaunchPad™ is compatible
with a given BoosterPack™ (see dev.ti.com/bpchecker/#).
Ensure that the 3V3 and 5V pins are aligned with the BoosterPack™ module header pins. On the CC3235
LaunchPad™, a small white 3V3 tag symbol is provided near pin 1 (see Figure 3) to orient all
BoosterPack™ modules. This same marking, provided on compatible BoosterPack™ modules, must be
aligned before powering up the boards.
Figure 3. Pin 1 Marking on CC3235 LaunchPad™ (3v3 Tag)

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2.4 Wired Connections, Jumper Settings, Buttons, and LEDs
2.4.1 JTAG Headers
Headers are provided onboard to isolate the CC3235 device from the onboard XDS110-based JTAG
emulator. These jumpers are shorted by default when the board is shipped from TI. Figure 4 and Table 1
show default configurations. Figure 5 shows the external emulator connection.
Figure 4. Default Jumper Configuration for JTAG Lines
(1) For SWD mode, only TCK and TMS must be shorted to the CC3235 device.
Table 1. JTAG Header Pin Definitions
Reference Use Comments
J4 (TCK)(1) JTAG and SWD
Jumpers populated: onboard emulator connected
Jumpers not populated: onboard emulator disconnected
J4 (TMS)(1) JTAG and SWD
J4 (TDI) JTAG
J4 (TDO) JTAG

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To connect an external emulator, remove these jumpers and place the external emulator on the JTAG IN
connector (see Figure 5).
Figure 5. JTAG IN Connector

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2.4.2 I2C Connections
The board features an accelerometer and a temperature sensor for the out-of-box demo. These features
are connected to the I2C bus, and can be isolated using the jumpers provided (J19 and J20).
Figure 6. I2C Connections
By removing J19 and J20, the accelerometer and the temperature sensors are isolated from the I2C bus.
This also removes the I2C pull-up resistors from the sensor side of the circuit, and therefore any
connection to the circuit requires the user to install external pull-up resistors.
Table 2 lists the I2C jumper definitions.
Table 2. I2C Jumper Definitions
Reference Use Comments
J20 I2C SDA Jumpers populated: onboard sensors connected
Jumpers not populated: onboard sensors disconnected
J19 I2C SCL
2.4.2.1 Default I2C Addresses
Table 3 lists the default I2C addresses of the onboard sensors.
Table 3. Default I2C Addresses (of Onboard Sensors)
Sensor Type Reference Designator on
LaunchPad Part Number (Manufacturer) Default Slave Address (Hex)
Temperature (MEMS IR Thermpile) U12 TMP116 (TI) 0x41
Accelerometer (Triaxial) U13 BMA280 (Bosch) 0x18

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2.4.3 Power Connections
The board can be powered by using the onboard micro USB connector. An onboard DC-DC converter
provides 3.3 V for the CC3235 device and the rest of the board to operate. This supply can be isolated
from the DC-DC converter using the jumpers on the board. See the yellow jumpers in Figure 7. VBAT and
VBRD are both attached to 3V3, but are routed to different devices to allow for power measurements.
VBAT is routed only to critical parts of the LaunchPad™ that are required for operation. This allows for
proper measurements of our devices power consumption. VBRD is routed to other devices, like the LEDs,
I2C devices, and BoosterPack™ header by default.
Figure 7. Power Jumpers J28, J23, J24, J18, J21, and J22
Table 4 lists the jumper settings for the LaunchPad™ power.
Table 4. Jumper Settings for LaunchPad™ Power
Reference Use Comments
J18 OPAMP EN If uninstalled, the power supply to the operational amplifier (OPAMP) is
cut off. This can be used to enable low-power measurements.
J28 GND Ground reference
J23 5V Connects+5 VDC from emulator section to the rest of the board.
J24 VBAT current
measurement Used to measure the current flowing into the CC3235 device. Also includes the serial flash.
J21 BRD power Supplies the board power from the onboard DC/DC converter. The
board power is used for the sensors, LED, and the OPAMP used to
drive the ADC input.
J22 VCC_BUFFER Used to power the level shifters on the emulator side of the board. The
level shifters can be powered by shorting this jumper. Removing this
jumper enables low-current measurement.

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The board can be powered by an external supply when USB power is not available, by using J24. J25 is
also available to remove any current draw from LEDs being driven by the GPIOs.
Figure 8 shows the external supply connections and LED Enable jumper.
Figure 8. External Supply Connections and LED Enable Jumper
Table 5 lists the jumper settings for the external supply connections.
Table 5. External Supply Connections and LED Enable Jumper
Reference Use Comments
J27 +5V power input Used to power the board from an external 5-V supply.
J26 3.3-V power input Used to power the board from an external 3.3-V supply.
A reverse-voltage protecting diode can be populated on Q6 to prevent
the battery from being plugged in the reverse manner. Additionally,
resistor R163 must be depopulated and a 0-Ωresistor must be soldered
on R169.
J25 LED EN If uninstalled, the LEDs connected to the GPIO are disabled; this can be
used to enable low-power measurements.
2.4.4 Reset Pull-Up Jumper
Table 6 lists the reset pull-up jumper.
Table 6. Reset Pull-Up Jumper
Reference Use Comments
J12 RESET pullup Install this jumper to enable the pull-up resistor on the nRESET pin of
the device when the board is powered from an external supply.

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2.4.5 Sense on Power (SOP)
The CC3235 device can be set to operate in four different modes, based on the state of the sense-on-
power (SOP) lines. These SOP lines are pins 21, 34, and 35 on the CC3235 device. Table 7 lists the
states of the device, and Figure 9 shows the SOP jumpers. Each SOP line has a 3 position header that
can be be pulled up or pulled down. The bottom of the SOP configuration is pull ups, and top is pull
downs. The current SOP configuration in Figure 9 would then be 010 (Flash/Function).
Table 7. J15, J16, J17 on LaunchPad™
SOP[2:0] (Binary) Function
000 Functional mode and 4-wire JTAG
001 Functional mode and 2-wire JTAG
010 Functional mode and flash programming
011 Factory default
100 Flash programming
Figure 9. SOP Jumpers (Default Setting Shown)

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NOTE: In the LaunchPad™ schematic design:
• SOP2 corresponds to J15
• SOP1 corresponds to J16
• SOP0 corresponds to J17
Placing a jumper on the top two pins of the header pull downs the SOP line. Placing a
jumper on the bottom two pins of the header pulls up the SOP line.
J14 provides an option to pull up the SOP lines using either VBAT_CC or VCC_BRD.
2.4.6 UART Signals
The board supports a USB-based virtual COM port, using the Tiva™ Arm®MCU. The LaunchPad™ is
shipped with the UART lines from the CC3235 device connected to the UART of the TM4C129 (Tiva)
MCU. The CC3235 UART can also be routed to the 20-pin connector for use as a GPIO or external
UART. The selection is performed using onboard jumpers.
Figure 10 shows the UART routed to the USB COM port and Figure 11 shows the UART routed to 20-pin
header connector.
Figure 10. UART Routed to USB COM Port
Figure 11. UART Routed to 20-Pin Header Connector

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2.4.7 Push-Buttons and LED Indicators
Table 8 list the push-button definitions. See Figure 1 for location.
Table 8. Push-Button Definitions
Reference Use Comments
SW1 RESET This signal is used to reset the CC3235 device. This signal is also output
on the 20-pin connector to reset any external BoosterPack that may be
stacked. The reset can be isolated using the jumper block at the center
of the board.
SW2 GPIO_13 When pushed, GPIO_13 is pulled to VCC.
SW3 GPIO_22 When pushed, GPIO_22 is pulled to VCC.
SW4 Factory default (FRST) Pressing this button and toggling RESET (SW1) restores the factory
default image on the serial flash. This can be used to recover a
corrupted serial flash, provided the s-flash was programmed with a
recovery image.
Table 9 lists the LED indicators. See Figure 1 for location.
(1) GPIO_10 and GPIO_11 are also used as I2C. Thus, when the pull-up resistors are enabled, the LEDs are on by default, without
configuring the GPIOs.
Table 9. LED Indicators
Reference Color Use Comments
D1, D2 Green and Red Debug Indicates the state of the JTAG emulator. For TI
use only.
D3 Yellow nRESET Indicates the state of the nRESET pin. If this LED
is on, the device is functional.
D6 Red Factory Reset Indicates that the push-button for the factory reset
is pressed.
D7 RGB GPIO_10(1)
GPIO_11(1)
GPIO_09
On when the GPIO_xx is logic-1.
D8 Red Power Indicates when the 3.3-V power is supplied to the
board.

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2.4.8 BoosterPack™ Header Pin Assignment
The BoosterPack™ header pinout specification is available at Build Your Own BoosterPack. Also, see the
BoosterPack Module Pinout Standard, and the BoosterPack Compatibility Checker.
The CC3235 LaunchPad™ follows this standard, with the exception of naming (P1:P4 is used instead of
J1:J4.) See Figure 12 for CC3235 pin-mapping assignments and functions.
Figure 12. CC3235 BoosterPack™ Header Pin Assignments
NOTE: The RESET output is an open-drain-type output and can only drive the pin low. The pullup
ensures that the line is pulled back high when the button is released. No external
BoosterPack™ can drive this pin low.
All the signals are referred to by the pin number in the SDK; Figure 12 shows the default mappings. Some
of the pins are repeated across the connector. For example, pin 62 is available on P1 and P4, but only P1
is connected by default. The signal on P4 is marked with an asterisk (*) to signify that it is not connected
by default. The signal can be routed to the pin by using a 0-Ωresistor in the path. For the exact resistor
placement, see the CC3235S/CC3235SF SimpleLink™ Wi-Fi®LaunchPad™ Design Files.

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2.5 Power
2.5.1 USB Power
The LaunchPad™ is designed to work from the USB-provided power supply. The LaunchPad™ provides
addresses as a bus-powered device on the computer. When the board is powered from the USB
connector, the jumpers for VBAT and VBRD must be placed on the following headers, as shown in
Figure 13.
Figure 13. Powering From USB Jumper Settings

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2.5.2 Battery Powering CC3235 LaunchPad™ Kit
The LaunchPad™ kit can also be powered from an external battery pack by applying the voltage on the
J26 header. This input features an option to place a reverse-voltage protecting MOSFET, to ensure that
the board is not damaged due to an accidental reverse voltage. Perform the following steps before using
the board with a battery:
1. Remove the USB cable.
2. Plug in the battery pack on J26 with the correct polarity as shown in Figure 14.
3. Connect the jumper across J121and J24, as shown in Figure 14.
4. Connect Jumper J12 (RST PU) as shown in Figure 14.
Figure 14. CC3235 LaunchPad™ Powered by Battery

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2.5.3 Battery Powering Only CC3235 Device and U10 (Onboard Serial Flash)
In some cases, there may be a requirement to power only the CC3235 device and the serial flash from the
battery. The use may not require LEDs, an OP AMP for the ADC, and the sensors. In this case, the other
sections can be powered off by removing the appropriate jumpers. Ensure that a jumper is placed on
RST_PU (J12) of the LaunchPad™. Lastly, plug in the battery pack on J26 with the correct polarity. The
board would appear as shown in Figure 15.
Figure 15. Only CC3235 Device and Serial Flash Powered by Battery