찾아보니.. 6채널 PWM을 지원하는 MCU이니까
모터 하나당 1개의 PWM 채널로 DC 브러시모터를 제어하는 식으로
ESC없이 단순화 시킨 것으로 보인다.
The three main chips on the control board are:
Processor : NUVOTON MINI 54ZAN
Wireless : BEKEN BK2423
Stability : INVENSENSE MPU 6050C
[링크 : http://hackedgadgets.com/2014/11/27/syma-x5c-1-quadcopter-review-and-teardown/]
PWM Independent 16-bit PWM duty control units with maximum six outputs Supports group/synchronous/independent/ complementary modes Supports One-shot or Auto-reload mode Supports Edge-aligned and Center-aligned type Programmable dead-zone insertion between complementary channels Each output has independent polarity setting control Hardware fault brake protections Supports duty, period, and fault break interrupts Supports duty/period trigger ADC conversion Timer comparing matching event trigger PWM to do phase change Supports comparator event trigger PWM to force PWM output low for current period Provides interrupt accumulation function |
[링크 : http://www.nuvoton.com/resource-files/DS_Mini51DE_Series_EN_Rev1.01.pdf]
무선은 2.4GHz대 GFSK 라는 방식을 쓴다는데
Gaussian Frequency Shift Keying 의 약자인데 먼지 감이 안오네
[링크 : http://www.rfwireless-world.com/Terminology/GFSK-vs-FSK.html]