AS5043 10-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER
Demoboard Operation Manual
Revision 1.1, 04 Jul-06 www.austriamicrosystems.com
Page 17 of 21
6
Demoboard Schematic Description
6.1
Main Parts
AS5043 rotary encoder
Microcontroller
Power supply
Indicators
Connectors
6.1.1
AS5043 Rotary Encoder
The AS5043 (IC3) is configured for 3.3V supply (pin 15 & 16 tied together). The serial interface (pins CSn, CLK, DO) is
controlled by the microcontroller. The Mode output, Magnet diagnostic outputs (MagInc, MagDec) and PWM output are
directly connected to LEDs
6.1.2
Microcontroller
The installed Cypress™ EZ-USB controller (IC1) includes an on-chip USB PC-interface. The firmware is stored in an external
E²PROM (IC2). The I/O-ports directly control the AS5043 and the 4-digit 7-segment display.
The firmware is configured such that the demoboard runs as standalone application or as an input device for the demoboard
software. No user switching is required, the software detects automatically, which mode is required.
Furthermore, the controller provides the proper pulse timings for OTP programming of an external AS5043 encoder,
connected to CON2. All that is required for programming is an external DC voltage of about 7.5V / 130mA.
6.1.3
ADC
To acquire voltage of the analog output of the onboard or external encoder an ADC (IC4) is used.
6.1.4
Power Supply
The 3.3V supply is provided by the linear voltage regulator IC5. Either the 5V supply from the USB port or an external DC
voltage at pin 2/Con3 may be used as supply inputs.
6.1.5
Indicators
The 4digit 7-segment display for the absolute angle is controlled directly by the Microcontroller. The LEDs are connected to
the digital outputs of the AS5043
6.1.6
Connectors
CON1 = USB connector for data transmission and power supply from PC
CON2 = 8-pin male 100mil pitch connector for connecting an external AS5043 application or the AS5043 adapter PCB (see
chapter 3.6)
CON3 = 3-pin male 100mil pitch connector for connecting an external power supply and the OTP programming voltage.
