MMA8452QR1 Freescale Semiconductor, MMA8452QR1 Datasheet - Page 39

• Manufacturer Part Number: MMA8452QR1
• Description: Board Mount Accelerometers LOW G 3-AXIS 12BT EX VLT
• Manufacturer: Freescale Semiconductor

Specifications of MMA8452QR1

• Sensing Axis: X, Y, Z
• Acceleration: 2 g, 4 g, 8 g
• Digital Output - Number Of Bits: 8 bit, 12 bit
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 1.95 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Digital Output - Bus Interface: I2C
• Shutdown: Yes
• Sensitivity: 256 count/g, 512 count/g, 1024 count/g
• Package / Case: QFN-16
• Output Type: Digital
• Rohs Compliant: Yes
• Peak Reflow Compatible (260 C): Yes
• Acceleration Range: ± 2g, ± 4g, ± 8g
• No. Of Axes: 3
• Ic Interface Type: I2C
• Sensor Case Style: QFN
• No. Of Pins: 16
• Supply Voltage Range: 1.95V To 3.6V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

0x28: PULSE_WIND Second Pulse Time Window Register
0x28 PULSE_WIND Register (Read/Write)
the start of the second pulse event must be detected provided the device has been configured for double pulse detection. The
detected second pulse width must be shorter than the time limit constraints specified by the PULSE_TMLT register, but the end
of the double pulse need not finish within the time specified by the PULSE_WIND register.
Oversampling mode and LPF Filter Option multiplied by 255.
Table 47. PULSE_WIND Description
Sensors
Freescale Semiconductor
The bits WIND7 through WIND0 define the maximum interval of time that can elapse after the end of the latency interval in which
The minimum time step for the pulse window is defined in
WIND7
Table 48. Time Step for PULSE Detection Window @ ODR and Power Mode (Reg 0x0F) Pulse_LPF_EN = 1
Table 49. Time Step for PULSE Detection Window @ ODR and Power Mode (Reg 0x0F) Pulse_LPF_EN = 0
Bit 7
WIND[7:0]
ODR (Hz)
ODR (Hz)
12.5
6.25
1.56
12.5
6.25
1.56
800
400
200
100
800
400
200
100
50
50
WIND6
Normal
Normal
Bit 6
0.638
1.276
0.318
0.318
0.638
1.276
2.56
10.2
10.2
10.2
10.2
2.56
2.56
2.56
2.56
5.1
Second Pulse Time Window. Default value: 0000_0000.
Max Time Range (s)
Max Time Range (s)
LPLN
0.638
1.276
LPLN
0.318
0.318
0.638
1.276
2.56
10.2
40.8
40.8
40.8
2.56
10.2
10.2
10.2
WIND5
5.1
Bit 5
HighRes
HighRes
0.638
1.276
1.276
1.276
1.276
1.276
1.276
1.276
0.318
0.318
0.318
0.318
0.318
0.318
0.318
0.318
WIND4
Bit 4
Table 48
0.638
1.276
0.318
0.638
1.276
2.56
10.2
40.8
81.6
81.6
2.56
20.4
20.4
20.4
5.1
5.1
LP
LP
and
WIND3
Bit 3
Table
Normal
Normal
1.25
1.25
2.5
2.5
10
20
40
40
40
40
10
10
10
10
5
5
49. The maximum time is the time step at the ODR,
WIND2
Bit 2
LPLN
LPLN
1.25
1.25
160
160
160
2.5
2.5
10
20
40
10
40
40
40
Time Step (ms)
Time Step (ms)
5
5
HighRes
HighRes
WIND1
1.25
1.25
1.25
1.25
1.25
1.25
1.25
1.25
2.5
Bit 1
5
5
5
5
5
5
5
1.25
160
320
320
2.5
2.5
LP
LP
10
20
40
10
20
80
80
80
5
5
MMA8452Q
WIND0
Bit 0
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