AS5045 12-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER
Adapter PCB Operation Manual
Revision A.02, 14-Mar-07 www.austriamicrosystems.com
Page 9 of 12
If you use the Adapter PCB as external encoder for the AS5045 demoboard with an extension cable or experience
data transmission errors, it is requested to configure the Adapter PCB for 3.3V supply voltage.
9.1.1
Modifications to operate the adapter board at 3.3V
Perform the following modifications:
•
disconnect the 5V supply between Demoboard and Adapter PCB: remove or cut off pin "+5VUSB" at the
bottom of the AS5045 demoboard
•
connect pins "3V3" and "5V" on the Adapter PCB. Ideally, connect the pins right at the bottom of the
7pin female connector with a piece of wire or solder joint.
•
you may also remove the 78L05 voltage regulator from the Adapter PCB to prevent accidental damage
of the IC when an input voltage is applied to the regulator (and the 5V output is fed to the VDD3V3
supply pin)
Figure 9: Configuring the Adapter PCB for 3.3V operation (See Figure 10)
AS5045 Demoboard
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
1 MagINCn
MagDECn
NC
NC
NC
Mode
VSS
Prog_DI
DO
CLK
CSn
PWM
NC
NC
VDD3V3
VDD5V
AS5045
IC1
+
7
2
3
4
5
6
1
10n
1µF
µC
Cap only required for
OTP programming
GND
PROG
CSN
DO
CLK
5VUSB
VDD3V3
VSS
+
10µF
2
3
1
GND
VSS
VPROG
7.5 … 8.0V
only required for
OTP programming
connect to USB
interface on PC
USB
For programming,
keep these 6 wires
as short as possible!
max. length = 2 inches (5cm)
22k
*see Text
3V3
Figure 10: Connecting an external AS5045 application to the demoboard (See Figure 9)
* If longer cables are used, a pull-down resistor at the DO line of 22k - 56k Ohms is recommended to discharge
the signal between data transmissions and no static voltage is built up.
ams
AG
Technical
content
still
valid
