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AIROC™ Bluetooth® LE module
Peripheral and communication interfaces
SPI master device that supports 1.8 V or 3.3 V SPI slaves. The CYBLE-3x307x-02 can also act as an SPI slave device
that supports a 1.8 V or 3.3 V SPI master.
Note SPI voltage depends on VDDO/VDDM; therefore, it defines the type of devices that can be supported.
8.6
Infrared modulator
The CYBLE-3x307x-02 includes hardware support for infrared TX. The hardware can transmit both modulated and
unmodulated waveforms. For modulated waveforms, hardware inserts the desired carrier frequency into all IR
transmissions. IR TX can be sourced from firmware-supplied descriptors, a programmable bit, or the peripheral
UART transmitter.
If descriptors are used, they include IR on/off state and the duration between 1–32767/µs. The CYBLE-3x307x-02
IR TX firmware driver inserts this information in a hardware FIFO and makes sure that all descriptors are played
out without a glitch due to under run (see
Figure 11
Infrared TX
8.7
PDM microphone
The CYBLE-3x307x-02 accepts a -based one-bit pulse density modulation (PDM) input stream and outputs
filtered samples at either 8 kHz or 16 kHz sampling rates. The PDM signal derives from an external kit that can
process analog microphone signals and generate digital signals. The digital signal passes through the chip IO and
MUX inputs using an aux ADC signal. The PDM shares the filter path with the aux ADC.
Two types of data rates can be supported:
• 8 kHz
• 16 kHz
The external digital microphone accepts a 2.4 MHz clock generated by the CYBLE-3x307x-02 and outputs a PDM
signal which is registered by the PDM interface with either the rising or falling edge of the 2.4 MHz clock selectable
through a programmable control bit. The design can accommodate two simultaneous PDM input channels, so
stereo voice is possible.
8.8
Security engine
The CYBLE-3x307x-02 includes a hardware security accelerator that greatly decreases the time required to
perform typical security
operations. These functions include:
• Public key acceleration (PKA) cryptography
• AES-CTR/CBC-MAC/CCM acceleration
• SHA2 message hash and HMAC acceleration
Preliminary Datasheet
Figure
11).
CYBLE-3x307x-02
27 of 58
002-33419 Rev. **
2021-07-22
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