AS5145A AMSCO [austriamicrosystems AG], AS5145A Datasheet - Page 14

• Manufacturer Part Number: AS5145A
• Description: 12-Bit Programmable Magnetic Rotary Encoder
• Manufacturer: AMSCO [austriamicrosystems AG]

AS5145
Data Sheet - D e t a i l e d D e s c r i p t i o n
Z-axis Range Indication (Push Button Feature, Red/Yellow/Green Indicator).
movement and distance of the magnet in the Z-direction. Signal indicators MagINCn and MagDECn are available both as hardware pins (pins #1
and 2) and as status bits in the serial data stream
In the default state, the status bits MagINC, MagDec and pins MagINCn, MagDECn have the following function:
Table 9. Magnetic Field Strength Red-Yellow-Green Indicator
Note: Pin 1 (MagINCn) and pin 2 (MagDECn) are active low via open drain output and require an external pull-up resistor. If the magnetic
The two pins may also be combined with a single pull-up resistor. In this case, the signal is high when the magnetic field is in range. It is low in all
other cases
8.1.2 Incremental Mode
The AS5145 has an internal interpolator block. This function is used if the input magnetic field is to fast and a code position is missing. In this
case an interpolation is done.
With the OTP bits OutputMd0 and OutputMd1 a specific mode can be selected. For the available pre-programmed incremental versions (10bit
and 12bit), these bits are set during test at austriamicrosystems. These settings are permanent and can not be recovered.
A change of the incremental mode (WRITE command) during operation could cause problems. A power-on-reset in between is recommended.
During operation in incremental mode it is recommended setting CSn = High, to disable the SSI-Interface.
Table 10. Incremental Resolution
www.austriamicrosystems.com/AS5145
Default mode
Incremental
Incremental
mode (high
Sync mode
(low DNL)
Mac
INC
Mode
10 bit
mode
12 bit
DNL)
0
1
1
All other combinations
field is in range, both outputs are turned off.
(see Table
Status Bits
Mag DEC
DTEST1_A and DTEST2_B are used as
Mode_Index pin is used for selection of
In this mode a control signal is switched
Mode_Index Pin is switched from input
to output and will be the Index Pin. The
decimation rate is set to 64 (fast mode)
and cannot be changed from external.
0
1
1
the decimation rate (low speed/high
AS5145 function DTEST1_A and
A and B signal. In this mode the
to DTEST1_A and DTEST2_B.
DTEST2_B are not used. The
9).
LIN
Description
0
0
1
speed).
Mac INCn Mag DECn
n/a
Off
On
On
Hardware Pins
(see Figure
Off
Off
On
n/a
Output
5).
Md1
0
0
1
1
Revision 1.10
RED range: magnetic field is ~<25mT or >~135mT. It is still possible to
AS5145 may still be operated in this range, but with slightly reduced
YELLOW range: magnetic field is ~ 25…45mT or ~75…135mT. The
Output
operate the AS5145 in the red range, but not recommended.
Md0
0
1
0
1
Magnetic input field OK (GREEN range, ~45…75mT)
OPT: Mag CompEn = 1 (Red-Yellow-Green)
Resolution
The AS5145 provides several options of detecting
10
12
No distance change
Not available
Description
accuracy.
DTest1_A
DTest2_B
Pulses
1024
and
256
Index Width
LSB
1/3
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