ams AG AS5045 Operation Manual - Page 10

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AS5045 12-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER
Adapter PCB Operation Manual
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)
IC1
1
16
VDD5V
MagINCn
2
15
MagDECn
VDD3V3
3
14
NC
NC
13
4
NC
NC
5
12
NC
PWM
6
11
CSn
Mode
7
10
VSS
CLK
8
9
Prog_DI
DO
10n
AS5045
Cap only required for
OTP programming
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.
Revision A.02, 14-Mar-07
For programming,
keep these 6 wires
as short as possible!
max. length = 2 inches (5cm)
7
6
5
4
3
2
1
+
22k
*see Text
1µF
www.austriamicrosystems.com
AS5045 Demoboard
3V3
PROG
CSN
µC
DO
CLK
5VUSB
VDD3V3
VSS
GND
connect to USB
interface on PC
VPROG
3
2
+
1
10µF
VSS
GND
7.5 ... 8.0V
only required for
OTP programming
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