MMA5206W Freescale Semiconductor, MMA5206W Datasheet - Page 24

• Manufacturer Part Number: MMA5206W
• Description: IC ACCELER 60G X-AXIS 16QFN
• Manufacturer: Freescale Semiconductor

Specifications of MMA5206W

• Sensing Axis: X
• Acceleration: 60 g
• Sensitivity: 0.125 g/LSB
• Package / Case: QFN-16
• Supply Voltage (max): 25 V
• Supply Current: 4 mA to 8 mA
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

24
3.5
3.5.1
3.5.2
block.
3.5.3
processing flow within the DSP block is shown in
MMA52xxWR
The transducer is an overdamped mass-spring-damper system defined by the following transfer function:
where:
Reference
A sigma delta modulator converts the differential capacitance of the transducer to a 1 MHz data stream that is input to the DSP
A Digital Signal Processing (DSP) block is used to perform signal filtering and compensation. A diagram illustrating the signal
ΣΔ_OUT
ΔC = C
Acceleration Signal Path
Transducer
ΣΔ Converter
Digital Signal Processing Block
C
C
A
TOP
BOT
g-CELL
Section 2.7
TOP
DOWNSAMPLING
SINC FILTER
ζ = Damping Ratio
ω
V = ΔC x V
- C
n
= Natural Frequency = 2 ∗ Π ∗ f
BOT
for transducer parameters.
X
α
/ C
B
E
1
=
INT1
C
OFFSET CANCELLATION
V
INT1
LOW PASS FILTER
LOW PASS FILTER
X
Figure 14. ΣΔ Converter Block Diagram
β
1
INTEGRATOR
Figure 15. Signal Chain Diagram
H s ( )
FIRST
1 - z
Figure
z
-1
-1
n
C
=
CANCELLATION
RATE LIMITING
OUTPUT
COMPENSATION
-------------------------------------------------------- -
s
OFFSET
15.
2
+
α
2 ξ ω n s
2
⋅ ⋅
ω n
2
D
⋅
β
2
INTEGRATOR
+
V = ±2 × V
SECOND
ω n
F
1 - z
2
z
-1
-1
REF
OUTPUT
SCALING
QUANTIZER
1-BIT
ADC
DAC
G
INTERPOLATION
Freescale Semiconductor
ΣΔ_OUT
H
OUTPUT
Sensors