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Bluetooth Module Series
HC06U_Hardware_Design 18 / 31
SPI makes it suitable for most of SPI slave devices for its flexibility. SPI offers four modes due to the
programmable ability of SCK’s polarity and phase. The delay from CS to SCK, the delay from SCK to
NCS and SCK period are also programmable. SPI timing diagram is shown in figure below:
Figure 5: SPI Timing
3.8. GPIOs

Programmable GPIOs;

Each pin can choose either pull-up or pull-down resistors;

Each pin remains the last state when the chipset enters sleep mode;

Each pin interrupt can wake up chipset from sleep mode.
3.9. ADC Interfaces
HC06U integrates high speed and low power consumption 12-bit General Purpose Analog-to-Digital
Converter (GPADC) for sampling an external signal. It can operate in unipolar (single-ended) mode as
well as bipolar (differential) mode. The ADC has its own 1.2 V voltage regulator (LDO), which represents
the full-scale reference voltage.
The features of ADC interfaces are as follows:
 12-bit dynamic ADC with 65 ns conversion time
 Maximum sampling rate 3.3 M sample/s

Ultra-low power (5 A typical supply current at 100 k sample/s)