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AIROC™ Bluetooth® LE module
Functional description
6.1.2
Test mode support
The CYBLE-3x307x-02 fully supports the Bluetooth® Test mode as described in Part I:1 of the Specification of the
Bluetooth® System Version 3.0. This includes the transmitter tests, normal and delayed loopback tests, and
reduced hopping sequence.
In addition to the standard Bluetooth® Test Mode, the CYBLE-3x307x-02 also supports enhanced testing features
to simplify RF debugging and qualification and type-approval testing. These features include:
• Fixed frequency carrier wave (unmodulated) transmission
- Simplifies some type-approval measurements (Japan)
- Aids in transmitter performance analysis
• Fixed frequency constant receiver mode
- Receiver output directed to I/O pin
- Allows for direct BER measurements using standard RF test equipment
- Facilitates spurious emissions testing for receive mode
• Fixed frequency constant transmission
- 8-bit fixed pattern or PRBS-9
- Enables modulated signal measurements with standard RF test equipment.
6.1.3
Frequency hopping generator
The frequency hopping sequence generator selects the correct hopping channel number based on the link
controller state, Bluetooth® clock, and device address.
6.2
Microcontroller unit
The CYW20835 microprocessor unit runs software from the link control (LC) layer up to the host controller
interface (HCI). The microprocessor is a Cortex-M4 32-bit RISC processor with embedded ICE-RT debug and serial
wire debug (SWD) interface units.
The microprocessor also includes 2 MB of ROM memory for program storage and 384 KB of RAM for data
scratch-pad. The internal ROM provides flexibility during power-on reset to enable the same device to be used in
various configurations. At powerup, the lower-layer protocol stack is executed from internal ROM.
External patches can be applied to the ROM-based firmware to provide flexibility for bug fixes and feature
additions. The device also supports the integration of user applications and profiles.
6.2.1
Floating point unit
CYW20835 includes the CM4 single precision IEEE-754 compliant floating point unit. For details, see the Cortex-M4
manual.
6.2.2
OTP memory
The CYW20835 includes 2 KB of one-time programmable memory that can be used by the factory to store
product-specific information.
Note Use of OTP requires that a 3V supply be present at all times.
6.2.3
NVRAM configuration data and storage
NVRAM contains configuration information about the customer application, including the following:
• Fractional-N information
• BD_ADDR
• UART baud rate
• SDP service record
Preliminary Datasheet
22 of 58
002-33419 Rev. **
2021-07-22
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