AS5045ASSU austriamicrosystems, AS5045ASSU Datasheet - Page 9

• Manufacturer Part Number: AS5045ASSU
• Description: IC, MAGNETIC ROTARY ENCODER 12BIT SSOP16
• Manufacturer: austriamicrosystems

Specifications of AS5045ASSU

• Ic Function: Encoder IC
• Supply Voltage Range: 3V To 3.6V, 4.5V To 5.5V
• Operating Temperature Range: -40°C To +125°C
• Digital Ic Case Style: SSOP
• No. Of Pins: 16
• Msl: MSL 3 - 168 Hours
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AS5045 12-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER
5
The mode input pin activates or deactivates an internal filter that is used to reduce the analog output noise.
Activating the filter (Mode pin = LOW) provides a reduced output noise of 0.03° rms. At the same time, the output delay is
increased to 384µs. This mode is recommended for high precision, low speed applications.
Deactivating the filter (Mode pin = HIGH) reduces the output delay to 96µs and provides an output noise of 0.06° rms. This
mode is recommended for higher speed applications.
The MODE pin should be set at power-up. A change of the mode during operation is not allowed.
Switching the Mode pin affects the following parameters:
5.1
If CSn changes to logic low, Data Out (DO) will change from
high impedance (tri-state) to logic high and the read-out will
be initiated.
Revision 1.5
CSn
CLK
DO
After a minimum time t
output shift register with the first falling edge of CLK.
Each subsequent rising CLK edge shifts out one bit of
data.
The serial word contains 18 bits, the first 12 bits are
the angular information D[11:0], the subsequent 6 bits
contain system information, about the validity of data
such as OCF, COF, LIN, Parity and Magnetic Field
status (increase/decrease).
A subsequent measurement is initiated by a “high”
pulse at CSn with a minimum duration of t
Parameter
sampling rate
transition noise (1 sigma)
output delay
max. speed @ 4096 samples/rev.
max. speed @ 1024 samples/rev.
max. speed @ 256 samples/rev.
max. speed @ 64 samples/rev.
Mode Input Pin
t
DO active
Synchronous Serial Interface (SSI)
t
CLK FE
1
D11
T
t
CLK/2
DO valid
D10
Table 2: Slow and fast mode parameters 12-bit Absolute Angular Position Output
CLK FE,
D9
Figure 5: Synchronous serial interface with absolute angular position data
D8
data is latched into the
D7
Angular Position Data
slow mode (Mode = low)
2.61 kHz (384 µs)
≤ 0.03° rms
384µs
38 rpm
153 rpm
610 rpm
2441 rpm
D6
CSn.
www.austriamicrosystems.com
D5
8
D4
D3
D2
5.1.1
D11:D0 absolute angular position data (MSB is clocked
out first)
OCF
indicates the finished Offset Compensation Algorithm
COF (Cordic Overflow), logic high indicates an out of
range error in the CORDIC part. When this bit is set, the
data at D9:D0 is invalid. The absolute output maintains
the last valid angular value.
This alarm may be resolved by bringing the magnet
within the X-Y-Z tolerance limits.
LIN (Linearity Alarm), logic high indicates that the input
field
When this bit is set, the data at D9:D0 may still be used,
but can contain invalid data. This warning may be
resolved by bringing the magnet within the X-Y-Z
tolerance limits.
Even Parity bit for transmission error detection of bits
1…17 (D11…D0, OCF, COF, LIN, MagINC, MagDEC)
D1
D0
Data Content
(Offset
generates
OCF COF
Compensation
Status Bits
fast mode (Mode = high, VDD5V)
10.42 kHz (96µs)
≤ 0.06° rms
96µs
153 rpm
610 rpm
2441 rpm
9766 rpm
LIN
a
Mag
INC
critical
DEC
Mag
18
Finished),
Even
PAR
t
DO Tristate
t
output
CSn
t
CLK FE
logic
Page 9 of 24
linearity.
1
high
D11