as5140 austriamicrosystems, as5140 Datasheet - Page 10

• 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
9.1
9.4
In addition to the regular programming, a redundant programming option is available. This option allows that one selectable
OTP bit can be set to “1” (programmed state) by writing the location of that bit into a 5-bit address decoder. This address
can be stored in bits RA5..0 in the OTP user settings.
Example: setting RA5…0 to “00001” will select bit 51 = MD0, “00010” selects bit 50 = MD1, “10000” selects bit 36 = CCW,
etc..
9.5
PROG
Revision 1.1, 02-03-2007
CLK
CSn
Bit
51
50
49
48
47
46
37
36
35
31
30
18
17
16
0
:
:
:
:
OTP Memory Assignment
Redundant programming option
OTP register entry and exit condition
Setup Condition
Figure 13:OTP access timing diagram
ChipID17
Symbol
ChipID0
ChipID1
FS 12
mbit1
Index
mbit0
Operation Mode Selection
CCW
FS 0
FS 1
Table 6: OTP Bit Assignment
Md0
Md1
Div0
Div1
RA0
RA4
Z0
Z9
:
:
:
18 bit Chip ID
Redundancy
Output Mode
Factory Bit
Incremental
10 bit Zero
Factory Bit
Factory Bit
Factory Bit
Factory Bit
Function
Direction
Selection
Position
Address
OTP Access
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Exit Condition
9.2
The AS5140H allows programming of the following user
selectable options:
Md1, Md0
Div1,Div0
Index
Z [9:0]
CCW
RA [4:0]
9.3
The AS5140H can also be operated without
programming. The default, un-programmed setting is:
Md0, MD1: 00 = incremental mode = quadrature
Div0,Div1 : 00 = incremental resolution = 10bit
Index: 0
Z9 to Z0: 00
CCW: 0
RA4 to RA0:0 = no OTP bit is selected
ccw=1 – angular value increases in counterclockwise direction
ccw=0 – angular value increases in clockwise direction
To avoid accidental modification of the OTP during
normal operation, each OTP access (Load, Write, Read,
Program) requires a defined entry and exit procedure,
using the CSn, PROG and CLK signals as shown in
Figure 13.
User selectable settings
OTP Default Setting
Incremental Output Mode Selection
Divider Setting of Incremental Output
Index Pulse Width Selection: 1LSB / 3LSB
Programmable Zero / Index Position
Counter Clockwise Bit
Redundant Address:
addressed by this address is always set to “1”
independent of the corresponding original OTP
bit setting
= no programmed zero position
= clockwise operation
= Index bit width = 1LSB
an OTP bit location
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