MMA8205EG Freescale Semiconductor, MMA8205EG Datasheet - Page 22

• Manufacturer Part Number: MMA8205EG
• Description: Board Mount Accelerometers X- AXIS 50G SOIC 16
• Manufacturer: Freescale Semiconductor
• Series: MMA82r

Specifications of MMA8205EG

• Sensing Axis: X
• Acceleration: 50 g
• Sensitivity: 8.02 mV/g
• Package / Case: SOIC-16
• Axis: X or Y
• Acceleration Range: ±50g
• Voltage - Supply: 6.3 V ~ 30 V
• Output Type: Digital
• Bandwidth: -
• Interface: SPI
• Mounting Type: Surface Mount
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Data returned in response to a Read Acceleration Data command varies, as illustrated in
also affected by the state of the self-test circuitry and internal parity. If the self-test circuitry is enabled, the ST bit will be set in
data bit D12 of a short word response. If a transient undervoltage condition, parity fault, ground fault or device disable condition
exists, the reserved data value of zero will be reported in response to a short word command structure to indicate that a fault
condition has been detected. The data value is not affected by a fault condition when a long word response is reported, however
the S and GF bits will be set as appropriate.
If the self-test circuitry is active, acceleration data is reported regardless of parity faults. The Status (S) bit will be set in either
short word or long word responses if a parity fault is detected.
4.5.4.1
Acceleration values may be determined from the 10-bit digital output (DV) as follows:
a = sensitivity × (DV - 512)
Sensitivity is determined by nominal full-scale range (FSR), linear range of digital values and a scaling factor to compensate for
sensitivity error.
The linear range of digital values for MMA81XXEG/MMA82XXEG/MMA82XXTEG is 1 to 1023. The digital value of 0 is reserved
as an error
indicator.
For the linear ranges of digital values indicated, the nominal value of 1 LSB for each full-scale range is shown in the table below.
MMA81XXEG
22
D15
A3
Response
Length
10
11
12
13
14
15
D14
A2
ACCELERATION DATA REPRESENTATION
DEVCFG1[1]
D13
A1
D14
D12
A0
Table 4-5 Short Response Structure - Read Acceleration Data Command
Table 4-6 Long Response Structure - Read Acceleration Data Command
D11
DEVCFG1[0]
GF
D13
Full-Scale Range (g)
D10
S
Table 4-7 Nominal Sensitivity (10-bit data)
250
150
100
AD9
50
40
20
D9
D12
ST
AD8
D11
D8
GF
Data
D10
AD7
D7
S
Nominal Sensitivity (g/digit)
AD9 AD8 AD7 AD6 AD5 AD4 AD3 AD2 AD1 AD0
D9
AD6
D6
Response
D8
AD5
0.0976
0.0488
0.366
0.244
0.122
D5
0.61
D7
AD4
D4
D6
AD3
D3
Table 4-5
D5
AD2
D2
D4
and
AD1
Freescale Semiconductor
D1
D3
Table
AD0
D0
D2
4-6. The result is
0 to 8 bits
D1
CRC
Sensors
D0