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SCA720-D01-10

P1-P3P4-P6P7-P9P10-P12P13-P13
SCA720-D01
Murata Electronics Oy 10/13
www.muratamems.fi Doc. nr. 82171500 Rev.A
The self-test generates an electrostatic force, deflecting the sensing element’s proof mass, thus
checking the complete signal path. The true self test performs following checks:
• Sensing element movement check
• ASIC signal path check
• PCB signal path check
• Micro controller A/D and signal path check
The created deflection can be seen in analogue output. Self test can be activated applying logic”1”
(positive supply voltage level) to ST pin (pin 9) of SCA720. The self test Input high voltage level is
4 – Vdd+0.3 V and input low voltage level is 0.3 – 1 V.
Figure 7. Self test wave forms.
V1 = initial output voltage before the self test function is activated.
V2 = output voltage during the self test function.
V3 = output voltage after the self test function has been de-activated and after stabilization time
Please note that the error band specified for V3 is to guarantee that the output is within 5% of the
initial value after the specified stabilization time. After a longer time (max. 1 second) V1=V3.
T1 = Pulse length for Self test activation
T2 = Saturation delay
T3 = Recovery time
T4 = Stabilization time =T2+T3
T5 = Rise time during self test.
T1 [ms] T2 [ms] T3 [ms] T4 [ms] T5 [ms] V2: V3:
10-100 Typ. 20 Typ. 50 Typ. 70 Typ. 10 Min 0.95*VDD
(4.75V @Vdd=5V)
0.95*V1-
1.05*V1
Self test characteristics.
Vout
5V
0 V
T
IME
[
MS
]
T1
T2
T3
T4
V1
V2
V3
ST pin
voltage
0 V
5 V
T5
SCA720-D01
Murata Electronics Oy 11/13
www.muratamems.fi Doc. nr. 82171500 Rev.A
3. Application information
The SCA720 should be powered from a well regulated 5 V DC power supply. Coupling of digital
noise to the power supply line should be minimized. 100nF filtering capacitor between VDD pin 11
and GND plane must be used. If regulator is placed far from component for example other PCB it
is recommend adding more capacitance between VDD and GND to ensure current drive capability
of the system. For example 470 pF and 1uF capacitor can be used.
The SCA720 has a ratiometric output. To get the best performance use the same reference
voltage for both the SCA720 and Analog/Digital converter.
Locate the 100nF power supply filtering capacitor close to VDD pin 11. Use as short a trace length
as possible. Connect the other end of capacitor directly to the ground plane. Connect the GND pin
5 to underlying ground plane. Use as wide ground and power supply planes as possible. Avoid
narrow power supply or GND connection strips on PCB.
3.1. Housing dimensions and recommended PCB layout
Figure 8
.
Housing dimensions and recommended PCB layout [mm].
Notes:
• It is important that the part is parallel to the PCB plane and that there is no angular alignment
error from intended measuring direction during assembly process.
• 1° mounting alignment error will increase the cross-axis sensitivity by 1.7%
• 1° mounting alignment error will change the output by 17 mg
• Wave soldering is not recommended
• Ultrasonic cleaning is not allowed
• A supply voltage by-pass capacitor (> 100 nF) is recommended
SCA720-D01
Murata Electronics Oy 12/13
www.muratamems.fi Doc. nr. 82171500 Rev.A
3.2. Reflow soldering
The SCA720 is suitable for Sn-Pb eutectic and Pb- free soldering process and mounting with
normal SMD pick-and-place equipment. Recommended body temperature profile during reflow
soldering:
Figure 10.
Recommended body temperature profile during reflow soldering. Ref.
IPC/JEDEC J-STD-020D.
Profile feature Sn-Pb Eutectic
Assembly
Pb-free Assembly
Average ramp-up rate (T
L
to T
P
) 3 °C/second max. 3 °C/second max.
Preheat
- Temperature min (T
smin
)
- Temperature max (T
smax
)
-
Time (min to max) (ts)
100 °C
150 °C
60-120 seconds
150 °C
200 °C
60-180 seconds
Tsmax to T
L
- Ramp up rate
3°C/second max
Time maintained above:
- Temperature (T
L
)
- Time (t
L
)
183 °C
60-150 seconds
217 °C
60-150 seconds
Peak temperature (T
P
) 240 +0/−5 °C 250 +0/−5 °C
Time within 5 °C of actual Peak Temperature
(T
P
)
10-30 seconds 20-40 seconds
Ramp-down rate 6 °C/second max 6 °C/second max
Time 25 °C to Peak temperature 6 minutes max 8 minutes max
The Moisture Sensitivity Level of the part is 3 according to the IPC/JEDEC J-STD-020D. The
part should be delivered in a dry pack. The manufacturing floor time (out of bag) in the
customer’s end is 168 hours.
P1-P3P4-P6P7-P9P10-P12P13-P13

SCA720-D01-10

Mfr. #:
Buy SCA720-D01-10
Manufacturer:
Murata Electronics
Description:
Accelerometers 1-Axis Accelerometer Analog
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
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