| Parameter | Value | Units |
| Max. Shaft Axial Play |
±0.025 |
in. |
| Max. Shaft Eccentricity Plus Radial Play (1) |
0.004 |
in. |
| Max. Acceleration |
250000 |
rad/sec² |
| Moment of Inertia |
8.49 x 10^-7 |
oz-in-s² |
| Mounting Screw Size (pan head) |
4-40 x 1/4" |
- |
| 2 Screw Bolt Circle Diameter |
.750 ± .005 |
in. |
| 2 Screw Bolt Circle Diameter |
1.280 ± .005 |
in. |
| 2 Screw Bolt Circle Diameter |
1.812 ± .005 |
in. |
Required Shaft Length, including axial play (1)
Size 220 Shaft Length-option
Size 500 Shaft Length-option |
0.220 (+0.015 / -0.020)
0.500 (+0.015 / -0.020) |
in.
in. |
| Base to Mounting Surface Torque |
4 - 6 |
in-lbs |
| Shaft diameter tolerance, relative to nominal |
-0.0001 to -0.0006 |
in. |
| Technical Bulletin TB1001 - Shaft and Bore Tolerances |
Download |
(1) For optimum accuracy, the magnetic hub must be fully seated on the shaft and the shaft play must meet the specified axial and radial limits.
(2) The chip that decodes position uses sampled data. There will be fewer readings per revolution as the speed increases. The formula for number of readings per revolution is given by:
10-bit PWM:
n = 625200 / rpm
12-bit PWM / Analog:
n = 156600 / rpm
Analog output is only available in 10-bit resolution. The analog output voltage is ratiometric to the power supply voltage and will typically swing within 15 millivolts of the power supply rails with no output load. This non-linearity near the rails increases with increasing output loads. For this reason, the output load impedance should be ≥4.7kΩ and less than 100pF. The graphs below show the typical output levels for various output loads when powered by a 5V supply.
| Parameter | Min. | Typ. | Max. | Units |
| Position Sampling Rate |
2.35 |
2.61 |
2.87 |
kHz |
| Propagation Delay |
- |
- |
384 |
μS |
| Analog Output Voltage Maximum (1) |
- |
4.987 |
- |
Volts |
| Analog Output Voltage Minimum (1) |
- |
0.015 |
- |
Volts |
| Output Short Circuit Sink Current (2) |
- |
32 |
50 |
mA |
| Output Short Circuit Source Current (2) |
- |
36 |
66 |
mA |
| Output Noise (2) |
160 |
220 |
490 |
µVrms |
| Output Transition Noise (3) |
- |
0.03 |
- |
Deg. RMS |
(1) With no output load. See graphs below.
(2) Continuous short to +5V or ground will not damage the MAE3.
(3) Transition noise is the jitter in the transition between two adjacent position steps.
The magnetic sensor chip in the MAE3 has an on-chip RC oscillator which is factory trimmed to 5% accuracy at room temperature (10% over full temperature range). This tolerance influences the sampling rate and the pulse period of the PWM output. If only the PWM pulse width ton and nominal pulse period is used to measure the angle, the resulting value also has this timing tolerance. However, this tolerance can be cancelled by measuring both ton and toff and calculating the angle from the duty cycle.
| Parameter | Min. | Typ. | Max. | Units |
PWM Frequency (-40C to 125C)
10-bit
12-bit |
0.877
220 |
0.975
244 |
1.072
268 |
kHz
Hz |
Minimum Pulse Width
10-bit
12-bit |
0.95
0.95 |
1.00
1.00 |
1.05
1.05 |
uS
uS |
Maximum Pulse Width
10-bit
12-bit |
974
3892 |
1025
4097 |
1076
4302 |
uS
uS |
Internal Sampling Rate
10-bit
12-bit |
9.38
2.35 |
10.42
2.61 |
11.46
2.87 |
kHz
kHz |
Propagation Delay
10-bit
12-bit |
-
- |
-
- |
48
384 |
uS
uS |
| Output Transition Noise, 12-bit version (1) |
|
.03 |
|
Deg. RMS |
| Output Transition Noise, 10-bit version (1) |
|
.12 |
|
Deg. RMS |
| Output High Voltage (VOH: @4mA Source) (2) |
Vcc -0.5 |
- |
- |
V |
| Output Low Voltage (VOL: @4mA Sink) (2) |
- |
- |
0.4 |
V |
(1) Transition noise is the jitter in the transition between two adjacent position steps.
(2) Continuous short to +5V or ground will not damage the MAE3.
10-bit PWM:
x = ((t on * 1026) / (t on+ t off)) -1
If x <= 1022, then Position = x
If x = 1024 then Position = 1023
12-bit PWM:
x = ((t on * 4098) / (t on+ t off)) -1
If x <= 4094, then Position = x
If x = 4096 then Position = 4095
