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AS5035 PROGRAMMABLE 64 PPR INCREMENTAL MAGNETIC ROTARY ENCODER
DATA SHEET
1
General Description
2
-
Key Features
Full turn (360) contactless angular position encoder 2 quadrature A/B outputs with 64 pulses per revolution (ppr), 256 edges per revolution, 1.4 per step Index output (one pulse per revolution) Accurate user programmable zero position (0.35) Failure detection mode for magnet placement monitoring and loss of power supply Wide temperature range: - 40C to + 125C Small lead-free package: SSOP 16 (5.3mm x 6.2mm)
The AS5035 is a magnetic incremental encoder with 64 quadrature pulses per revolution (8-bit resolution) and index output. Two diagnostic outputs are provided to indicate an out-ofrange condition of the magnetic field as well as movement of the magnet in Z-axis. In addition a specific combination of output states indicate a loss of power supply. The AS5035 is available in a small 16pin SSOP package. It can be operated at either 3.3V or 5V supplies.
3
Applications
Industrial applications: - Robotics - Replacement of optical encoders - Flow meters - Man-machine interface Automotive applications: - Power seat position sensing - Power mirror position sensing
Figure 1: Typical arrangement of AS5035 and magnet
1.1
-
Benefits
Complete system-on-chip, including analog front end and digital signal processing 2-channel quadrature and index outputs provide an alternative to optical encoders User programmable Zero positioning by OTP allows easy assembly of magnet Diagnostic features for operation safety Ideal for applications in harsh environments due to magnetic sensing principle Robust system, tolerant to magnet misalignment, air gap variations, temperature variations and external magnetic stray fields No calibration required
4
Pin Configuration
Figure 2: AS5035 Pin configuration SSOP16
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AS5035 - 64 PPR INCREMENTAL MAGNETIC ROTARY ENCODER
VDDV3V
VDD5V
LDO 3.3V
MagINCn MagDECn CSn
Hall Array & Frontend Amplifier
Sin
Ang
Channel A Incremental Decoder Channel B Index
DSP
Cos Mag
AS5035
OTP Zero Position
OTP_CLK OTP_DO PROG
Figure 3: AS5035 Block diagram
4.1
Pin #
Pin List & Description
Name Type AS5035
SSOP16 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 MagInc MagDec A B N.C. Index VSS Prog OTP_DO OTP_CLK CSn N.C. N.C. N.C. VDD3V3 VDD5V DO_OD DO_OD DO DO test DO Supply DI , pd DO_T DI,ST DI_ST, pu test test test Supply Supply Mag. Field indicator Mag. Field indicator Quadrature channel A Quadrature channel B Must be left open Incremental Index output Supply Ground OTP Programming Input. Internal pull-down resistor (~74k). Should be connected to VSS if not used Data Output for Zero Position programming Clock Input for Zero Position programming; SchmittTrigger input. Should be connected to VSS if not used Enable outputs A,B,I (see 5.4). Connect to VSS for normal operation Must be left open Must be left open Must be left open 3V regulator output 5V positive supply input
Table 1: Pin description
DO_OD DI pu test
: : : :
digital output, open drain DO : digital push/pull output digital input ST : Schmitt-Trigger input internal pull-up resistor pd : internal pull-down resistor pin is used for factory testing, must be left unconnected
4.2
Unused Pins
Pins # 5, 8, 12, 13 and 14 are for factory testing and must be left unconnected Pins# 8, 9 and 10 are used for OTP Zero Position Programming only. In normal operation, they can be left open or connected to VSS (pins 8 and 10 only)
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AS5035 - 64 PPR INCREMENTAL MAGNETIC ROTARY ENCODER
5
5.1
5.1.1
Connecting the AS5035
Power Supply
5.0V Operation
5.2
Logic High and Low Levels
VDD5V will be either 3.0 - 3.6V or 4.5 - 5.5V, depending on configuration. In either case, the logic levels on output pins A, B and Index will be Vout high = VDD5V - 0.5V, Vout low = VSS+0.4V.
Connect a 4.5V to 5.5V power supply to pin VDD5V only. Add a 1F to 10F buffer capacitor to pin VDD3V3
5.1.2
3.3V Operation
The logic level on the CSn input pin will be Vin high = VDD5V*0.7, Vin low = VDD5V*0.3
Connect a 3.0V to 3.6 V power supply to both pins VDD5V and VDD3V3. If necessary, add a 100nF ceramic buffer capacitor to pin VDD3V3.
5.3
5V Operation
2.2...10F
Output Current
The available maximum output current on pins A, B and Index to maintain the Vout high and Vout low levels is 2mA (sink and source) at VDD5V = 3.0V
VDD3V3
100n
VDD5V
LDO
Internal VDD A
4mA (sink and source) at VDD5V = 4.5V
4.5 - 5.5V
I N T E R F A C E
B Index CSn
5.4
5.4.1
Chip Select Pin CSn
Without Power-up Diagnostic Feature
VSS
Prog OTP_CLK OTP_DO
For standalone operation without microcontroller, pin CSn should be connected to VSS permanently. The incremental outputs will be available, as soon as the internal offset compensation is finished (within <50ms).
5.4.2
With Power-up Diagnostic Feature
3.3V Operation
VDD3V3
100n
A diagnostic feature is available to detect a temporary loss of power or initial power-up of the AS5035: if the CSn pin is high or left open (internal pull up resistor
Internal VDD A
VDD5V
LDO
~50k) during power-up, the incremental outputs will remain in high state: A = B = Index = High. This state indicates a power-up or temporary loss of power, as in normal operation A, B and Index will never be high at the same time. When Index is high, both A and B are low. To clear this state end enable the incremental outputs, CSn must be pulled low. The incremental outputs will remain enabled if CSn returns to high afterwards.
3.0 - 3.6V
I N T E R F A C E
B Index CSn
VSS
Prog OTP_CLK OTP_DO
Figure 4: Connections for 5V / 3.3V supply voltages
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AS5035 - 64 PPR INCREMENTAL MAGNETIC ROTARY ENCODER
5.5
MagInc and MagDec Indicators
These two pins are open-drain outputs with a maximum driving capability of 2mA @ 3.0V and 4mA @ 4.5V. MagINC, (Magnitude Increase) turns on, when the magnet is pushed towards the IC, thus when the magnetic field strength is increasing. MagINC off off on on MagDEC off on off on Description
MagDEC, (Magnitude Decrease) turns on, when the magnet is pulled away from the IC, thus when the magnetic field strength is decreasing. If both outputs are low, they indicate that the magnetic field out of the allowed range:
No distance change. Magnetic Input Field OK Distance increase (Magnet pulled away from IC) Distance decrease (Magnet pushed towards IC) Magnetic Input Field invalid - out of range: either too large (magnet too close) or too small (missing magnet or magnet too far away)
Table 2: Magnetic field strength diagnostic outputs
off = open-drain output transistor is off. Using a pull-up resistor, the output is high on = open-drain output transistor is on. Using a pull-up resistor, the output is low Both outputs MagInc and MagDec may be tied together, using one common pull-up resistor. In this case, the output will be high only when the magnetic field is in range. It will be low when either the magnet is moving in Z-axis or when the magnetic field is out of range.
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6.1
Incremental Outputs
A, B and Index
6.2
Hysteresis
The phase shift between channel A and B indicates the direction of the magnet movement. Channel A leads channel B at a clockwise rotation of the magnet (top view, magnet placed above or below the device) with 90 electrical degrees. Channel B leads channel A at a counter-clockwise rotation. The Index pulse has a width of 1LSB = 1.4
To avoid flickering of the incremental outputs at a stationary mechanical position, a hysteresis of 0.7 is introduced. When the direction of rotation is reversed, the incremental outputs will not change state unless the movement in the opposite direction is larger than the hysteresis. This leads to the effect that the A,B and Index pulse positions will be shifted by 0.7 when the rotational direction is reversed. This shift is cancelled again with the next reversal of direction so that the A,B and Index pulses appear always at the same position for a given rotational direction no matter how often the rotational direction is reversed (see Figure 5). .
Mechanical Zero Position
Rotation Direction Change
Mechanical Zero Position
A B
1.40625 =90e Hysteresis =0.7 5.625 =360e Index= 1.40625
Index
CSn
power-up t
Incremental outputs valid
Figure 5: Incremental quadrature outputs Revision 1.5 www.austriamicrosystems.com Page 4 of 17
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7
Zero Position Programming
For Zero Position Programming, the magnet is turned to the mechanical zero position (e.g. the "off"-position of a rotary switch) and an automatic zero position programming is applied. The zero position is programmed to an accuracy of +/0.35.
Zero Position Programming is an OTP option that simplifies assembly of a system, as the magnet does not need to be manually adjusted to the mechanical zero position. Once the assembly is completed, the mechanical and electrical zero positions can be matched by software. Any position within a full turn can be defined as the permanent new index position.
Figure 6: Hardware connection of AS5035 to AS50xx Demoboard for Zero Position Programming
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7.1
OTP Programming Timing
The specified programming voltage at pin Prog is 7.3 - 7.5V (see section 12.8). To compensate for the voltage drop across the VPROG switching transistor, the applied programming voltage may be set slightly higher (7.5 8.0V). 7.1.1 CCW Bit Programming
OTP programming requires access to the factory settings register of the AS5035. Improper or accidental modification of the factory settings may render the chip unusable. Therefore the Zero Position and CCW programming is recommended only with austriamicrosystems proprietary hardware and software. Note: During the programming process, the transitions in the programming current may cause high voltage spikes generated by the inductance of the connection cable. To avoid these spikes and possible damage to the IC, the connection wires, especially the signals Prog and VSS must be kept as short as possible. The maximum wire length between the VPROG switching transistor and pin Prog (see Figure 6) should not exceed 50mm (2 inches). To suppress eventual voltage spikes, a 10nF ceramic capacitor should be connected close to pins Prog and VSS. This capacitor is only required for programming, it is not required for normal operation. The clock timing tclk must be selected at a proper rate to ensure that the signal Prog is stable at the rising edge of CLK (see Figure 7). Additionally, the programming supply voltage should be buffered with a 10F capacitor mounted close to the switching transistor. This capacitor aids in providing peak currents during programming.
The absolute angular output value, by default, increases with clockwise rotation of the magnet (top view). Setting the CCW-bit (see Figure 7) allows for reversing the indicated direction, e.g. when the magnet is placed underneath the IC: CCW = 0 - angular value increases clockwise; CCW = 1 - angular value increases counterclockwise.
Note: Further information on the required hardware and software for Zero Position programming of the AS5035 can be found in the "AS5035" section of the austriamicrosystems website: http:www.austriamicrosystems.com ( Rotary Encoders AS5035)
Figure 7: Programming access - write data (first section of Figure 8)
Figure 8: Complete programming sequence
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8
Simulation Modelling
3.9 mm 0.235mm
1
removes any common mode error due to DC components introduced by the magnetic source itself or external disturbing magnetic fields. A ratiometric division of the sine and cosine vectors removes the need for an accurate absolute magnitude of the magnetic field and thus accurate Z-axis alignment of the magnetic source. The recommended differential input range of the magnetic field strength (B(X1-X2),B(Y1-Y2)) is 75mT at the surface of the die. In addition to this range, an additional offset of 5mT, caused by unwanted external stray fields is allowed.
2.433 mm
0.235mm
Y1 X1 X2
Y2 The chip will continue to operate, but with degraded output linearity, if the signal field strength is outside the recommended range. Too strong magnetic fields will introduce errors due to saturation effects in the internal preamplifiers. Too weak magnetic fields will introduce errors due to noise becoming more dominant.
AS5040 die
Center of die
Radius of circular Hall sensor array: 1.1mm radius
Figure 9: Arrangement of Hall sensor array on chip (principle)
9
With reference to Figure 9, a diametrically magnetized permanent magnet is placed above or below the surface of the AS5035. The chip uses an array of Hall sensors to sample the vertical vector of a magnetic field distributed across the device package surface. The area of magnetic sensitivity is a circular locus of 1.1mm radius with respect to the center of the die. The Hall sensors in the area of magnetic sensitivity are grouped and configured such that orthogonally related components of the magnetic fields are sampled differentially. The differential signal Y1-Y2 will give a sine vector of the magnetic field. The differential signal X1-X2 will give an orthogonally related cosine vector of the magnetic field. The angular displacement () of the magnetic source with reference to the Hall sensor array may then be modelled by:
Choosing the Proper Magnet
Typically the magnet should be 6mm in diameter and 2.5mm in height. Magnetic materials such as rare earth AlNiCo, SmCo5 or NdFeB are recommended.
typ. 6mm diameter
N
S
Magnet axis R1
Magnet axis
Vertical field component
= arctan
(Y 1 - Y 2) 0.5 ( X 1 - X 2)
R1 concentric circle; radius 1.1mm Vertical field component Bv (45...75mT)
The 0.5 angular error assumes a magnet optimally aligned over the center of the die and is a result of gain mismatch errors of the AS5035. Placement tolerances of the die within the package are 0.235mm in X and Y direction, using a reference point of the edge of pin #1 (Figure 11) In order to neglect the influence of external disturbing magnetic fields, a robust differential sampling and ratiometric calculation algorithm has been implemented. The differential sampling of the sine and cosine vectors
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0
360
360
Figure 10: Typical magnet and magnetic field distribution
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AS5035 - 64 PPR INCREMENTAL MAGNETIC ROTARY ENCODER
The magnet's field strength perpendicular to the die surface should be verified using a gauss-meter. The magnetic field Bv at a given distance, along a concentric circle with a radius of 1.1mm (R1), should be in the range of 45mT...75mT. (see Figure 10).
N
Die surface
S
Package surface
z
0.576mm 0.1mm 1.282mm 0.15mm
9.1
Physical Placement of the Magnet
Figure 12: Vertical placement of the magnet
The best linearity can be achieved by placing the center of the magnet exactly over the defined center of the IC package as shown in Figure 11:
3.9 mm
1
10 Angular Output Tolerances
10.1 Accuracy
Accuracy is defined as the error between measured angle and actual angle. It is influenced by several factors:
3.9 mm
2.433 mm Defined center
the non-linearity of the analog-digital converters, internal gain and mismatch errors, non-linearity due to misalignment of the magnet
Rd
2.433 mm Area of recommended maximum magnet misalignment
As a sum of all these errors, the accuracy with centered magnet = (Errmax - Errmin)/2 is specified as better than 0.5 degrees @ 25C (see Figure 14). Misalignment of the magnet further reduces the accuracy. Figure 14 shows an example of a 3D-graph displaying non-linearity over XY-misalignment. The center of the square XY-area corresponds to a centered magnet (see dot in the center of the graph). The X- and Y- axis extends to a misalignment of 1mm in both directions. The total misalignment area of the graph covers a square of 2x2 mm (79x79mil) with a step size of 100m.
Figure 11: Defined IC center and magnet displacement radius
Magnet Placement: The magnet's center axis should be aligned within a displacement radius Rd of 0.25mm from the defined center of the IC with reference to the edge of pin #1 (see Figure 11). This radius includes the placement tolerance of the chip within the SSOP-16 package (+/- 0.235mm). The displacement radius Rd is 0.485mm with reference to the center of the chip The vertical distance should be chosen such that the magnetic field on the die surface is within the specified limits (see Figure 10). The typical distance "z" between the magnet and the package surface is 0.5mm to 1.8mm with the recommended magnet (6mm x 3mm). Larger gaps are possible, as long as the required magnetic field strength stays within the defined limits. A magnetic field outside the specified range may still produce usable results, but the out-of-range condition will be indicated by MagINCn (pin 1) and MagDECn (pin 2), see 5.5.
6
5 4 3 2 1 0 1000 800 600
800 500 200 -100 -400 400 200 -700 -200 -400 -600 -1000 -800 -1000 x
y
Figure 13: Example of linearity error over XY misalignment
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For each misalignment step, the measurement as shown in Figure 14 is repeated and the accuracy (Errmax - Errmin)/2 (e.g. 0.25 in Figure 14) is entered as the Z-axis in the 3D-graph. The maximum non-linearity error on this example is better than 1 degree (inner circle) over a misalignment radius of ~0.7mm. For volume production, the placement tolerance of the IC within the package (0.235mm) must also be taken into account.
The total nonlinearity error over process tolerances, temperature and a misalignment circle radius of 0.25mm is specified better than 1.4 degrees.
The magnet used for these measurement was a cylindrical NdFeB (Bomatec(R) BMN-35H) magnet with 6mm diameter and 2.5mm in height.
linearity error with centered magnet [degrees] 0.5 0.4 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5
transition noise Err m ax 0
90
180 Err m in
270
360
Figure 14: Example of linearity error over 360
e = electrical degrees (see Figure 5)
10.2 Transition Noise
Transition noise is defined as the jitter in the transition between two steps. Due to the nature of the measurement principle (Hall sensors + Preamplifier + ADC), there is always a certain degree of noise involved. This transition noise voltage results in an angular transition noise at the outputs. It is specified as 0.06 degrees rms (1 sigma) *1 . This is the repeatability of an indicated angle at a given mechanical position. The transition noise influences the period, width and phase shift of the output signals A, B and Index: Parameter Index Pulse width A,B Pulse width Period A-B Phase shift Tolerance (1) (rms) 1.406 +/-0.06 2.813 +/-0.06 5.625 +/-0.06 90e +/-1.9e Tolerance (3) (peak) 1.406 +/-0.18 2.813 +/-0.18 5.625 +/-0.18 90e +/-5.7e
*1
: statistically, 1 sigma represents 68.27% of readings, 3 sigma represents 99.73% of readings.
The algorithm used to generate the incremental outputs guarantees no missing or additional pulses even at high speeds (up to 30,000 rpm and higher)
10.3 High Speed Operation
10.3.1 Sampling Rate The AS5035 samples the angular value at a rate of 10k samples per second. Consequently, the incremental outputs are updated each 100s. At a stationary position of the magnet, this sampling rate creates no additional error. Incremental encoders are usually required to produce no missing pulses up to several thousand rpm's. Therefore, the AS5035 has a built-in interpolator, which ensures that there are no missing pulses at the incremental outputs for rotational speeds of up to 10,000rpm.
Table 3: Incremental signal tolerances with transition noise Revision 1.5 www.austriamicrosystems.com Page 9 of 17
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10.4 Output Delays
Due to the sampling rate of 10kHz, there will be a delay of up to 100s between the time that the sample is taken until it is converted and available as angular data. A rotating magnet will therefore cause an angular error caused by the output delay. This error increases linearly with speed:
10.5.3
Timing Tolerance over Temperature
The internal RC oscillator is factory trimmed to 5%. Over temperature, this tolerance may increase to 10%. Generally, the timing tolerance has no influence in the accuracy or resolution of the system, as it is used mainly for internal clock generation.
esampling = rpm 6 E -4
At low speeds this error is small (e.g. <= 0.06 at 100 rpm). At speeds over 586 rpm, the error approaches 1LSB (0.35). The maximum error caused by the sampling rate of the ADCs is 0/+100s. It has a peak of 1LSB = 0.35 at 586 rpm. At higher speeds this error is reduced again due to interpolation and the output delay remains at 200s as the DSP requires two sampling periods (2x100s) to synthesize and redistribute any missing pulses.
11 Failure Diagnostics
The AS5035 also offers several diagnostic and failure detection features:
11.1 Magnetic Field Strength Diagnosis
Pins #1 (MagINCn) and #2 (MagDECn) are open-drain outputs and will both be turned on (= low with external pull-up resistor) when the magnetic field is out of range. If only one of the outputs is low, the magnet is either moving towards the chip (MagINCn) or away from the chip (MagDECn).
11.2 Power Supply Failure Detection
11.2.1 MagINCn and MagDECn Pins:
10.5 Temperature
10.5.1 Magnetic Temperature Coefficient One of the major benefits of the AS5035 compared to linear Hall sensors is that it is much less sensitive to temperature. While linear Hall sensors require a compensation of the magnet's temperature coefficients, the AS5035 automatically compensates for the varying magnetic field strength over temperature. The magnet's temperature drift does not need to be considered, as the AS5035 operates with magnetic field strengths from 45...75mT.
These are open drain outputs and require external pullup resistors. In normal operation, these pins are high ohmic and the outputs are high (see Table 2). In a failure case, either when the magnetic field is out of range or the power supply is missing, these outputs will become low. To ensure adequate low levels in case of a broken power supply to the AS5035, the pull-up resistors (>10k) must be connected to the positive supply at pin 16 (VDD5V). 11.2.2 Incremental Outputs:
Example: A NdFeB magnet has a field strength of 75mT @ -40C and a temperature coefficient of -0.12% per Kelvin. The temperature change is from -40 to +125 = 165K. The magnetic field change is: 165 x -0.12% = -19.8%, which corresponds to 75mT at -40C and 60mT at 125C .
In normal operation, pins A(#3), B(#4) and Index (#6) will never be high at the same time, as Index is only high when A=B=low. However, after a power-on-reset, if VDD is powered up or restarts after a power supply interruption, all three outputs will remain in high state until pin CSn is pulled low (see 5.4.2 ). If CSn is already tied to VSS during power-up, the incremental outputs will all be high until the internal offset compensation is finished (within tPwrUp). Another way to detect a power supply loss is by connecting pull-up resistors to the A,B and Index pins at the receiving side (C, control unit, etc..). If the negative power line to the sensor is interrupted, all three outputs will be pulled high by the external pull-up resistors. This unique state again indicates a failure as it does not occur in normal operation.
The AS5035 can compensate for this temperature related field strength change automatically, no user adjustment is required. 10.5.2 Accuracy over Temperature
The influence of temperature in the absolute accuracy is very low. While the accuracy is 0.5 at room temperature, it may increase to 0.9 due to increasing noise at high temperatures.
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12 Electrical Characteristics
12.1 Absolute Maximum Ratings (non operating)
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only. Functional operation of the device at these or any other conditions beyond those indicated under "Operating Conditions" is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Parameter DC supply voltage at pin VDD5V DC supply voltage at pin VDD3V3 Input pin voltage Input current (latchup immunity) Electrostatic discharge Storage temperature Body temperature (Lead-free package) Humidity non-condensing
Symbol VDD5V VDD3V3 Vin Iscr ESD Tstrg TBody rH
Min -0.3
Max 7 5
Unit V V V mA kV
Note
-0.3 -100 2 -55
VDD5V +0.3 100
Norm: JEDEC 78 Norm: MIL 883 E method 3015 Min - 67F ; Max +257F t=20 to 40s, Norm: IPC/JEDEC J-Std-020C Lead finish 100% Sn "matte tin"
125 260
C C %
5
85
12.2 Operating Conditions
Parameter Ambient temperature Supply current Supply voltage at pin VDD5V Voltage regulator output voltage at pin VDD3V3 Supply voltage at pin VDD5V Supply voltage at pin VDD3V3 Symbol Tamb Isupp VDD5V VDD3V3 VDD5V VDD3V3 4.5 3.0 3.0 3.0 Min -40 16 5.0 3.3 3.3 3.3 Typ Max 125 25 5.5 3.6 3.6 3.6 Unit C mA V V V V 5V Operation 3.3V Operation (pin VDD5V and VDD3V3 connected) Note -40F...+257F
12.3 DC Characteristics for Digital Inputs and Outputs
12.3.1 CMOS Schmitt-Trigger Inputs: OTP_CLK, CSn (CSn = internal Pull-up) Symbol VIH VIL VIon- VIoff ILEAK IiL 1 -1
-30
Parameter High level input voltage Low level input voltage Schmitt-Trigger hysteresis Input leakage current Pull-up low level input current
Min 0.7 * VDD5V
Max 0.3 * VDD5V 1
-100
Unit V V V A A
Note Normal operation
CLK only CSn only, VDD5V: 5.0V
12.3.2
CMOS Output Open Drain: MagINCn, MagDECn Symbol VOL IO IOZ Min Max VSS+0.4 4 2 1 Unit V mA A VDD5V: 4.5V VDD5V: 3V Note
Parameter Low level output voltage Output current Open drain leakage current
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12.3.3
CMOS Outputs: A, B, Index, OTP_DO Symbol VOH VOL IO Min VDD5V-0.5 VSS+0.4 4 2 Max Unit V V mA mA VDD5V: 4.5V VDD5V: 3V Note
Parameter High level output voltage Low level output voltage Output current
12.4 Magnetic Input Specification
Two-pole cylindrical diametrically magnetised source: Parameter Diameter Thickness Magnetic input field amplitude Magnetic offset Field non-linearity Input frequency (rotational speed of magnet) Magnetic field temperature drift Displacement radius fmag_inc Btc Disp - 0.035 0.25 500 Hz %/K mm Symbol dmag tmag Bpk Boff Min 4 2.5 45 75 10 5 Typ 6 Max Unit mm mm mT mT % Note Recommended magnet O 6mm x 2.5mm for cylindrical magnets Required vertical component of the magnetic field strength on the die's surface, measured along a concentric circle with a radius of 1.1mm Constant magnetic stray field Including offset gradient Incremental mode: no missing pulses at rotational speeds of up to 30,000 rpm Samarium Cobalt ReComa28 Max. offset between defined device center and magnet axis (see Figure 11)
12.5 Electrical System Specifications
Parameter Resolution Index bit width Integral non-linearity (optimum) Symbol LSB RES tw,Index INLopt 1.406 0.5 Min Typ 1.406 8 64 Max Unit deg bit ppr deg deg Note Degrees / step Channel A and B = 1 LSB (see Table 3) Maximum error with respect to the best line fit. Centered magnet placement without calibration, Tamb =25 C. Maximum error with respect to the best line fit. Centered magnet placement without calibration, Tamb = -40 to +125C Best line fit = (Errmax - Errmin) / 2 Integral non-linearity Differential non-linearity Transition noise Hysteresis Power-on reset thresholds
On voltage; 300mV typ. hysteresis Off voltage; 300mV typ. hysteresis
Integral non-linearity (optimum)
INLtemp
0.9
deg
INL DNL TN Hyst Von Voff 1,37 1.08 0.704 2.2 1.9
1.4 0.176 0.06
deg deg Deg rms deg
Over displacement tolerance with 6mm diameter magnet, without calibration Tamb = -40 to +125C no missing codes rms = 1 sigma (see 10.2)
2.9 2.6
V V
DC supply voltage 3.3V (VDD3V3) DC supply voltage 3.3V (VDD3V3)
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12.6 Timing Characteristics
Parameter Power-up time Symbol tPwrUp Min Typ Max 50 500 Incremental outputs valid after power-up t Incremental
outputs valid
Unit ms ns
Note until internal offset compensation is finished if CSn is high during power up: = Time after tPwrUp from first falling edge of CSn to valid incremental outputs. If CSn is low during power up: Incremental outputs are valid as soon as tPwrUp is expired
System propagation delay Sampling rate fS 9.5 10
192 10.5
s kHz
Calculation over two samples Internal sampling rate
12.7 Incremental Output Signal Tolerances
See Table 3 on page 9
12.8 Programming Conditions
(operating conditions: Tamb = -40 to +125C, VDD5V = 3.0-3.6V (3V operation) VDD5V = 4.5-5.5V (5V operation) unless otherwise noted)
Parameter Programming enable time Write data start Write data valid Load programming data Rise time of VPROG before CLK PROG Hold time of VPROG after CLK PROG Write data - programming CLK PROG CLK pulse width Hold time of Vprog after programming Programming voltage Programming voltage off level Programming current
Symbol t Prog enable t Data in t Data in valid t Load PROG t PrgR t PrgH CLK PROG t PROG t PROG
finished
Min 2 2 250 3 0 0
Typ
Max
Unit s s ns s s
Note Time between rising edge at Prog pin and rising edge of CSn Write data at the rising edge of CLKPROG
5 250
s kHz s s During programming; 16 clock cycles Programmed data is available after next power-on Must be switched off after zapping Line must be discharged to this level During programming
1.8 2 7.3 0
2
2.2
V PROG V ProgOff I PROG
7.4
7.5 1 130
V V mA
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AS5035 - 64 PPR INCREMENTAL MAGNETIC ROTARY ENCODER
13 Package Drawings and Markings
16-Lead Shrink Small Outline Package SSOP-16
AYWWIZZ AS5035
Dimensions
Symbol A A1 A2 b c D E E1 e K L 0 0.63 mm Min 1.73 0.05 1.68 0.25 0.09 6.07 7.65 5.2 Typ 1.86 0.13 1.73 0.315 6.20 7.8 5.3 0.65 0.75 8 0.95 0 .025 Max 1.99 0.21 1.78 0.38 0.20 6.33 7.9 5.38 Min .068 .002 .066 .010 .004 .239 .301 .205 inch Typ .073 .005 .068 .012 .244 .307 .209 .0256 .030 8 .037 Max .078 .008 .070 .015 .008 .249 .311 .212
Marking: AYWWIZZ A: Pb-free Identifier Y: Last Digit of Manufacturing Year WW: Manufacturing Week I: Plant Identifier ZZ: Traceability Code
JEDEC Package Outline Standard: MO - 150 AC Thermal Resistance Rth(j-a): typ. 151 K/W in still air, soldered on PCB IC's marked with a white dot or the letters "ES" denote Engineering Samples
13.1 Packing Options
Delivery: Tape and Reel (1 reel = 2000 devices) Tubes (1 box = 100 tubes a 77 devices)
Order # AS5035 for delivery in tubes Order # AS5035TR for delivery in tape and reel
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AS5035 - 64 PPR INCREMENTAL MAGNETIC ROTARY ENCODER
14 Recommended PCB Footprint:
Recommended Footprint Data A B C D E mm 9.02 6.16 0.46 0.65 5.01 inch 0.355 0.242 0.018 0.025 0.197
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AS5035 - 64 PPR INCREMENTAL MAGNETIC ROTARY ENCODER
15 Contact
15.1 Headquarters
austriamicrosystems AG A 8141 Schloss Premstatten, Austria Phone: Fax: +43 3136 500 0 +43 3136 525 01
austriamicrosystems USA, Inc. 8601 Six Forks Road Suite 400 Raleigh, NC 27615, USA Phone: Fax: +1 919 676 5292 +1 509 696 2713
industry.medical@austriamicrosystems.com www.austriamicrosystems.com 15.2 Sales Offices
austriamicrosystems Germany GmbH Tegernseer Landstrasse 85 D-81539 Munchen, Germany Phone: Fax: +49 89 69 36 43 0 +49 89 69 36 43 66
austriamicrosystems USA, Inc. 4030 Moorpark Ave Suite 116 San Jose, CA 95117, USA Phone: Fax: +1 408 345 1790 +1 509 696 2713
austriamicrosystems Italy S.r.l. Via A. Volta, 18 I-20094 Corsico (MI), Italy Phone: Fax: +39 02 4586 4364 +39 02 4585 773
austriamicrosystems AG Suite 811, Tsimshatsui Centre East Wing, 66 Mody Road Tsim Sha Tsui East, Kowloon, Hong Kong Phone: Fax: +852 2268 6899 +852 2268 6799
austriamicrosystems France S.A.R.L. 124, Avenue de Paris F-94300 Vincennes, France Phone: Fax: +33 1 43 74 00 90 +33 1 43 74 20 98
austriamicrosystems AG austriamicrosystems Switzerland AG Rietstrasse 4 CH 8640 Rapperswil, Switzerland Phone: Fax: +41 55 220 9008 +41 55 220 9001 AIOS Gotanda Annex 5 t h Fl., 1-7-11, Higashi-Gotanda, Shinagawa-ku Tokyo 141-0022, Japan Phone: Fax: +81 3 5792 4975 +81 3 5792 4976
austriamicrosystems UK, Ltd. 88, Barkham Ride, Finchampstead, Wokingham Berkshire RG40 4ET, United Kingdom Phone: Fax: +44 118 973 1797 +44 118 973 5117
austriamicrosystems AG #805, Dong Kyung Bldg., 824-19, Yeok Sam Dong, Kang Nam Gu, Seoul Korea 135-080 Phone: Fax: +82 2 557 8776 +82 2 569 9823
austriamicrosystems AG Klaavuntie 9 G 55 FI 00910 Helsinki, Finland Phone: Fax: +358 9 72688 170 +358 9 72688 171 austriamicrosystems AG Singapore Representative Office 83 Clemenceau Avenue, #02-01 UE Square 239920, Singapore Phone: austriamicrosystems AG Bivagen 3B S 19163 Sollentuna, Sweden Phone: +46 8 6231 710 Fax: +65 68 30 83 05 +65 62 34 31 20
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AS5035 - 64 PPR INCREMENTAL MAGNETIC ROTARY ENCODER
Copyrights
Copyright (c) 1997-2007, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered (R). All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. All products and companies mentioned are trademarks or registered trademarks of their respective companies. This product is protected by U.S. Patent No. 7,095,228.
Disclaimer
Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or lifesustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for each application. The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However, austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of austriamicrosystems AG rendering of technical or other services.
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