MMA8452QR1 Freescale Semiconductor, MMA8452QR1 Datasheet - Page 24

Board Mount Accelerometers LOW G 3-AXIS 12BT EX VLT

MMA8452QR1

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

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

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Data Registers: 0x01 OUT_X_MSB, 0x02 OUT_X_LSB, 0x03 OUT_Y_MSB, 0x04 OUT_Y_LSB, 0x05 OUT_Z_MSB, 0x06
OUT_Z_LSB
sample data output registers store the current sample data.
incrementing address range of 0x01 to 0x06 to reduce reading the status followed by 12-bit axis data to 7 bytes. If the F_READ
bit is set (0x2A bit 1), auto increment will skip over LSB registers. This will shorten the data acquisition from
7 bytes to 4 bytes. The LSB registers can only be read immediately following the read access of the corresponding MSB register.
A random read access to the LSB registers is not possible. Reading the MSB register and then the LSB register in sequence
ensures that both bytes (LSB and MSB) belong to the same data sample, even if a new data sample arrives between reading the
MSB and the LSB byte.
0x0B: SYSMOD System Mode Register
should use this register to synchronize the application with the device operating mode transitions.
0x01 OUT_X_MSB: X_MSB Register (Read Only)
Table 13. SYSMOD Description
0x02 OUT_X_LSB: X_LSB Register (Read Only)
0x05 OUT_Z_MSB: Z_MSB Register (Read Only)
24
0x06 OUT_Z_LSB: Z_LSB Register (Read Only)
MMA8452Q
0x03 OUT_Y_MSB: Y_MSB Register (Read Only)
0x04 OUT_Y_LSB: Y_LSB Register (Read Only)
0x0B SYSMOD: System Mode Register (Read Only)
These registers contain the X-axis, Y-axis, and Z-axis 12-bit output sample data expressed as 2's complement numbers. The
OUT_X_MSB, OUT_X_LSB, OUT_Y_MSB, OUT_Y_LSB, OUT_Z_MSB, and OUT_Z_LSB are stored in the auto-
The system mode register indicates the current device operating mode. Applications using the Auto-SLEEP/WAKE mechanism
SYSMOD[1:0]
XD11
ZD11
Bit 7
YD11
Bit 7
Bit 7
Bit 7
XD3
Bit 7
Bit 7
YD3
ZD3
Bit 7
0
System Mode. Default value: 00.
00: STANDBY mode
01: WAKE mode
10: SLEEP mode
XD10
ZD10
Bit 6
YD10
Bit 6
Bit 6
Bit 6
XD2
Bit 6
Bit 6
Bit 6
YD2
ZD2
0
Bit 5
Bit 5
Bit 5
Bit 5
Bit 5
XD9
XD1
Bit 5
Bit 5
YD9
XD1
ZD9
ZD1
0
Bit 4
Bit 4
Bit 4
Bit 4
Bit 4
Bit 4
Bit 4
XD8
XD0
YD8
XD0
ZD8
ZD0
0
Bit 3
Bit 3
Bit 3
Bit 3
Bit 3
Bit 3
Bit 3
XD7
YD7
ZD7
0
0
0
0
Bit 2
Bit 2
Bit 2
Bit 2
Bit 2
Bit 2
Bit 2
YD6
XD6
ZD6
0
0
0
0
SYSMOD1
Bit 1
Bit 1
Bit 1
Bit 1
Bit 1
Bit 1
YD5
Bit 1
ZD5
XD5
Freescale Semiconductor
0
0
0
SYSMOD0
Bit 0
Bit 0
Bit 0
Bit 0
Bit 0
YD4
Bit 0
Bit 0
ZD4
XD4
0
0
0
Sensors

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