MMA7450LT Ver la hoja de datos (PDF) - Freescale Semiconductor
Número de pieza
componentes Descripción
Fabricante
MMA7450LT Datasheet PDF : 22 Pages
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Table 2. Operating Characteristics (Continued)
Unless otherwise noted: –20°C < TA < 65°C, 2.4 V < AVDD < 3.6 V, Acceleration = 0g, Loaded output
Characteristic
Symbol
Min
Typ
Max
Unit
Control Timing
Wait Time for IIC/SPI ready after power on
Turn On Response Time (Standby to Normal Mode)
Turn Off Response Time (Normal to Standby Mode)
Self Test Response Time
Sensing Element Resonant Frequency
XY
Z
Internal Sampling Frequency
Nonlinearity (2 g range)
tsu
1
ms
tru
20
ms
trd
20
ms
tst
ms
fGCELLXY
kHz
fGCELLZ
kHz
fCLK
kHz
-1
—
+1
%FS
Cross Axis Sensitivity
-5
+5
%
Orthogonality Error of Channels
TBD
TBD
°
Package to Die Misalignment
1
°
RF Field Influence to Sensor
TBD
LSB
1. These limits define the range of operation for which the part will meet specification.
2. Within the supply range of 2.4 and 3.6 V, the device operates as a fully calibrated linear accelerometer. Beyond these supply limits the device
may operate as a linear device but is not guaranteed to be in calibration.
3. This value is measured with g-Select in 2g mode.
4. The device can measure both + and - acceleration. The output is at mid-supply with no acceleration. The output will increase above VDD/2
for positive acceleration. The output will decrease below VDD/2 for negative acceleration.
5. The response time is between 10% of full scale Vdd input voltage and 90% of the final operating output voltage.
6. The response time is between 10% of full scale standby mode input voltage and 90% of the final operating output voltage.
7. The response time is between 10% of the full scale self test input voltage and 90% of the self test output voltage.
8. A measure of the device ability to reject acceleration is applied 90° from the true axis of sensitivity.
Table 3. Function Parameters for Detection
VL < VDD < VH; TL < TA < TH unless otherwise specified
Characteristic
Symbol
Min
Typ
Max
Level Detection
Detection Threshold Range
0
FS
Pulse Detection
Pulse detection range (Adjustable range)
0.5
127
Time step for pulse detection
0.5
Threshold range for pulses
0
FS
Detection levels for threshold (5)
127
Latency timer (Adjustable range)
1
150
Time Window (Adjustable range)
1
250
Measurement bandwidth for detecting interrupt
600
Time step for latency timer and time window
1
Note: The response time is between 10% of full scale Vdd input voltage and 90% of the final operating output voltage.
Unit
G
ms
ms
g
Levels
ms
ms
Hz
ms
MMA7450L
4
Sensors
Freescale Semiconductor
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