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MXD6241AU Datasheet Preview

MXD6241AU Datasheet

Autonomous 8-Angle Tip-Over Sensor

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MXD6241AU pdf
Autonomous 8-Angle Tip-Over Sensor
with High Vibration Immunity
MXD6240/6241AU
FEATURES
8 Pin-programmable angle thresholds
Single-wire digital output
Fully autonomous- no uC required
Built-in self-test functionality
Small, 6-pin 3 x 3mm LCC package
Operates from 2.7V to 5.5V Supply
No sensor resonance
Vibration filter: tolerates 20 g p-p @ 50Hz
vibration with < 1º incremental angle error
High reliability automotive process
RoHS compliant
Operates from -40 C to +125 C
APPLICATIONS :
Motorcycle Fall-Down Detection
Off-Road Vehicles
Jetski, watercraft
Other Tip-Over Detection (Space heaters, Irons, etc)
VDD
P2 P1 P0
2-Axis
Sensor
Signal
Cond’g
&A/D
DSP &
Hyst.
Delay
3-state
Output
Driver
OUT
Trim &
Cal
Circuits
Ref &
Bias
Gen
Clock &
Timing
Gen
GND
Figure 1. FUNCTIONAL BLOCK DIAGRAM
DESCRIPTION:
The MXD6240/6241AU is an inclination sensor with 8
built-in, pin-programmable angle thresholds. If the
device orientation with respect to vertical exceeds the
programmed threshold angle, the digital output
changes state to alert the system to a tip-over or fall-
down event. An internal anti-vibration filter
provides >45dB attenuation above 25Hz, and >60dB
attenuation above 50Hz.
The MXD6240/6241AU is designed to run
autonomously, making it ideal for systems where there
is no uC available. One of eight threshold angles (40,
42.5, 45, 50, 55, 60, 65, and 70 degrees) is selected
by connecting each of three programming pins to Vdd
or Gnd. The threshold accuracy is guaranteed to meet
+/-5 degrees (max) over a temperature range of -20C
to +80C (Operation is guaranteed over -40C to
+125C).
A built-in self-test function can detect a fault in the
internal sensor, and if triggered will cause the output
to go to a high impedance state.
Information furnished by MEMSIC is believed to be accurate and reliable.
However, no responsibility is assumed by MEMSIC for its use, or for any
infringements of patents or other rights of third parties which may result from
its use. No license is granted by implication or otherwise under any patent or
patent rights of MEMSIC.
The MXD6240/6241AU uses MEMSIC’s proprietary
thermal accelerometer technology. Because the
sensing element uses heated gas molecules instead
of a mechanical beam structure, the device is
extremely robust and reliable, with 50,000g shock
tolerance, no possibility of “stiction”, virtually no
mechanical resonance, and extremely high accuracy
over temperature. This makes the device extremely
well suited to harsh or high vibration environments,
where other sensors can exhibit false readings due to
resonance or other errors.
The MXD6240AU output is a logic low under normal
operation, and logic high during tip-over; the
MXD6241AU uses the opposite output polarity
(normally high, low during tip-over). A high-Z output
state signifies an internal self-test failure.
Both devices operate from a single 2.7V to 5.5V
supply, and are packaged in a small 6-pin, 3x3x1 mm
LCC package.
MEMSIC, Inc.
One Technology Drive, Suite 325, Andover, MA 01810, USA
Tel: +1 978 738 0900
Fax: +1 978 738 0196
www.memsic.com
MEMSIC MXC6240/41AU Rev.A (6/27/2016)
Page 1 of 6
Formal release date: 8/18/2016



MEMSIC
MEMSIC

MXD6241AU Datasheet Preview

MXD6241AU Datasheet

Autonomous 8-Angle Tip-Over Sensor

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MXD6241AU pdf
SENSOR CHARACTERISTICS:
(TA=25C, VDD= 5V, unless otherwise specified. Typical values are specified at 25C)
Parameter
Conditions
Min Typ Max Units
Threshold Angles
Threshold Accuracy (Note 1)
Pin-Programmable via P2, P1, P0
TA = -20C to +80C
40, 42.5,
45, 50,
55, 60,
65, 70
±2
±5
Deg
Deg
Threshold Error due to Vibration 20g p-p @ f 25Hz
(Note 2)
20g p-p @ f 50Hz
±3
±0.5
Deg
Sensor Bandwidth
(Note 3)
11 Hz
Resonance
(Note 4)
Undetectable
Hz
Shock Tolerance
50,000
g
Off-Axis Tilt Range
(For rated accuracy)
±15 Deg
LOW-G Lockout Threshold
(Note 5)
0.375
g
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Guaranteed by design and characterization, using ±4σ limits.
This is the incremental threshold error due to the vibration signal, applied parallel to the y axis
The sensor has an inherent low pass filter characteristic, which is very effective in attenuating out of band vibration.
The thermal accelerometer sensors use heated gas molecules, and have no measurable resonance
The LOW-G Lockout feature disables tip-over detection if the magnitude of both X and Y acceleration vectors fall below 0.375g (as in
the case of a free-fall or large off-axis tilt condition). See also “Fault Detection”.
ELECTRICAL SPECIFICATIONS:
(TA=25C, VDD= 5V, unless otherwise specified. Typical values are specified at 25C)
Parameter
Conditions
Min Typ Max Units
Supply Voltage
Supply Current
Operating Temperature
Output Update Rate (ODR)
Power On Time
Power On Reset Threshold
VDD Rise Time
(Note 6)
VDD rising edge to angle detection active
(Note 7)
2.7 5.5
0.8 3
-40 125
2.7 3 3.3
300 500
0.8 1.2 1.6
8
V
mA
C
Hz
ms
V
ms
Note 6:
Note 7:
This is the rate at which the logic state of the OUTPUT pin is updated. The output will typically change state within 1 – 2 ODR cycles of
a change in tip-over orientation. The above applies for Vdd = 5V. At Vdd = 2.7V, the ODR slows by ~15%.
Maximum allowable power supply rise time from 0.25V to 2.7V (minimum). Slower VDD rise time may cause erroneous data retrieval
from OTP memory at power-up.
DIGITAL PARAMETERS
(TA=25C, VDD= 5V, unless otherwise specified. Typical values are specified at 25C)
Parameter
Conditions
Min Typ Max Units
Logic Input Low
Logic Input High
Logic Output Low
Logic Output High
Logic Output High-Z
P2, P1, P0 Inputs
P2, P1, P0 Inputs
Sinking 0.5mA (Note 8)
Sourcing 0.5mA (Note 8)
After sensor fault is detected
0.7*Vdd
0.9*Vdd
0 0.3*Vdd
Vdd
0.1*Vdd
1
V
V
V
Mohm
Note 8: The output driver is capable of sourcing and sinking much higher currents, but it is recommended to keep the load current below 0.5mA
to avoid thermal gradients which may affect the angle threshold accuracy.
MEMSIC MXC6240/41AU Rev.A (6/27/2016)
Page 2 of 6
Formal release date: 8/18/2016


Part Number MXD6241AU
Description Autonomous 8-Angle Tip-Over Sensor
Maker MEMSIC
Total Page 6 Pages
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