as5140 austriamicrosystems, as5140 Datasheet - Page 13

• Manufacturer Part Number: as5140
• Description: 10-bit 360? Programmable Magnetic Rotary Encoder For High Ambient Temperatures Up To 150?c
• Manufacturer: austriamicrosystems

AS5140H 10-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER
11 3.3V / 5V Operation
The AS5140H operates either at 3.3V ±10% or at 5V
±10%. This is made possible by an internal 3.3V Low-
Dropout (LDO) voltage regulator. The internal supply
voltage is always taken from the output of the LDO,
meaning that the internal blocks are always operating at
3.3V.
For 3.3V operation, the LDO must be bypassed by
connecting VDD3V3 with VDD5V (see Figure 16).
For 5V operation, the 5V supply is connected to pin
VDD5V, while VDD3V3 (LDO output) must be buffered by
a 2,2..10µF capacitor, which is supposed to be placed
close to the supply pin (see Figure 16).
The VDD3V3 output is intended for internal use only It
must not be loaded with an external load.
The output voltage of the digital interface I/O’s
corresponds to the voltage at pin VDD5V, as the I/O
buffers are supplied from this pin (see Figure 16).
A buffer capacitor of 100nF is recommended in both
cases close to pin VDD5V. Note that pin VDD3V3 must
always be buffered by a capacitor. It must not be left
floating, as this may cause an instable internal 3.3V
supply voltage which may lead to larger than normal jitter
of the measured angle.
Revision 1.1, 02-03-2007
www.austriamicrosystems.com
4.5 - 5.5V
3.0 - 3.6V
5V Operation
3.3V Operation
100n
VDD5V
VDD5V
Figure 16: Connections for 5V / 3.3V supply voltages
VSS
VSS
LDO
LDO
VDD3V3
VDD3V3
2,2...10µF
Internal
VDD
N
R
C
Internal
VDD
N
R
C
T
E
F
A
E
T
E
F
A
E
I
I
DO
CLK
Index_W
DO
CLK
Index_W
Page 13 of 26
PWM_LSB
CSn
A_LSB_U
B_Dir_V
Prog
PWM_LSB
CSn
A_LSB_U
B_Dir_V
Prog
100n