MINI51ZAN QFN33-Pin Manual 3.2.2, p.16 CPNx/CPPx = Analog comparator input CPO=Analog comparator output AINx= ADC input CK0=Frequency divider output TxEX=Timer capture/reset input Pin Primary Secondary Function understood External connection 1 P1.5 AIN5, CPP0 Partially Connected to motor ctrl circuit 4 (sense?) 2 reset YES SWD Port reset 3 P3.0 AIN6, CPN1 NC? Not connected? 4 P5.4 NC? Not connected? 5 P3.1 AIN7, CPP1 Partially Connected to motor ctrl circuit 1 (sense?) 6 P3.2 T0EX,STADC,INT0 YES MPU6050, pin 12 (interrupt) 7 P3.4 SDA, T0 YES MPU6050, pin 24 (SDA) 8 P3.5 SCL, T1 YES MPU6050, pin 23 (SCL) 9 P3.6 T1EX,CK0,CPO0 Partially Connected to test pad 10 P5.1 XTAL2 NC? Not connected? 11 P5.0 XTAL1 NC? Not connected? 12 VSS YES VSS 13 P5.2 INT1 Partially Connected to unpopulated circuit part. Possibly be to control LEDS on left side 14 P2.2 PWM0 NC? Not connected? 15 P2.3 PWM1 NC? Not connected? 16 P2.4 PWM2 Partially Connected to Motor 1 ctrl 17 P2.5 PWM3 Partially Connected to Motor 2 ctrl 18 P2.6 PWM4, CPO1 Partially Connected to Motor 3 ctrl 19 P4.6 ICE_CLK (SWD) YES SWD Port CLK 20 P4.7 ICE_DAT (SWD) YES SWD Port Dat 21 P0.7 SPICLK YES BK2423 SPI CLK 22 P0.6 MISO YES BK2423 SPI MISO 23 P0.5 MOSI YES BK2423 SPI MOSI 24 P0.4 PWM5, SPISS Partially Connected to Motor 4 ctrl 25 P0.1 RTSn, RX, SPISS YES BK2434 SPI CSN 26 P0.0 CTSn, TX YES Controls LEDS via 10 Ohm resistors 27 P5.3 AIN0 NC? Not connected? 28 VDD YES 29 P1.0 AIN1 NO Connected to motor ctrl circuit 2 (sense?) 30 P1.2 RX, AIN2 YES UART PORT RX 31 P1.3 TX, AIN3 YES UART PORT TX 32 P1.4 CPN0, AIN4 Partially Connected to motor ctrl circuit 3 (sense?) 33 (Pad) VSS