AS5030 8 bit high speed magnetic rotary encoder
Demoboard Operation Manual
Revision 1.0, 29-May-08 www.austriamicrosystems.com
Page 5 of 8
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AS5030 Demoboard hardware
Figure 6: AS5030_DB_1.3 Demoboard schematics
3.1.1
Power supply
The demoboard is powered directly from the USB plug of a PC or from an external DC power supply (>7.5V, 100mA) connected
on the DC jack J6 and regulated through a 5V voltage regulator (I1, ZR78L05).
The programming high voltage (8.5V) for the external AS5030 is generated directly from the 5V source through a DC/DC step-up
converter U3. This source is used for the LCD power supply as well, for the contrast control through the P1 potentiometer.
The U2 voltage regulator is necessary for the 3.3V LCD power supply.
3.1.2
AS5030 Encoder
The AS5030 (U4) is running with the 5V source. The resistor R27 (0R) can be removed if the user wants to use his own power
supply for his own tests.
The SSI serial interface (DIO, CS, DCLK) is controlled by the microcontroller U5.
The LED D7 is directly connected to the AS5030 on the MagRngn pin on one side, and on U5 for the other side to make it
blinking if MagRngn = 5V (magnet too far away).
The PWM LED is directly connected on the PWM signal of U4.
The Test3..0 signals are connected to U5 but are not used.
3.1.3
Microcontroller
The microcontroller PIC 18F4550 (U5) from Microchip includes an on-chip USB interface.
The U1 switch enables the bootloader mode of the microcontroller, if pressed during power up.
In normal mode, pressing the switch makes the microcontroller writing the zero position value into the active AS5030.
The connector U7 is used for ISP programming of the microcontroller only.
