MMA7455L(2007) Просмотр технического описания (PDF) - Freescale Semiconductor
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MMA7455L Datasheet PDF : 27 Pages
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NOTES:
1. Use a 1 μF and a 10 μF capacitor on AVDD to and
DVDD_IO to decouple the power source.
2. Physical coupling distance of the accelerometer to
the microcontroller should be minimal.
3. Place a ground plane beneath the accelerometer to
reduce noise, the ground plane should be attached to
all of the open ended terminals shown in Figure 15
and Figure 16.
4. PCB layout of power and ground should not couple
power supply noise.
5. Accelerometer and microcontroller should not be a
high current path.
6. Any external power supply switching frequency
should be selected such that they do not interfere
with the internal accelerometer sampling frequency
(sampling frequency). This will prevent aliasing
errors.
Table 6. User Register Summary
Address Name
Definition
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
$00
XOUTL
10 bits output value X LSB
XOUT[7] XOUT[6] XOUT[5] XOUT[4] XOUT[3] XOUT[2] XOUT[1] XOUT[0]
$01
XOUTH
10 bits output value X MSB
--
--
--
--
--
--
XOUT[9] XOUT[8]
$02
YOUTL
10 bits output value Y LSB
YOUT[7] YOUT[6] YOUT[5] YOUT[4] YOUT[3] YOUT[2] YOUT[1] YOUT[0]
$03
YOUTH
10 bits output value Y MSB
--
--
--
--
--
--
YOUT[9] YOUT[8]
$04
ZOUTL
10 bits output value Z LSB
ZOUT[7] ZOUT[6] ZOUT[5] ZOUT[4] ZOUT[3] ZOUT[2] ZOUT[1] ZOUT[0]
$05
ZOUTH
10 bits output value Z MSB
--
--
--
--
--
--
ZOUT[9] ZOUT[8]
$06
XOUT8
8 bits output value X
XOUT[7] XOUT[6] XOUT[5] XOUT[4] XOUT[3] XOUT[2] XOUT[1] XOUT[0]
$07
YOUT8
8 bits output value Y
YOUT[7] YOUT[6] YOUT[5] YOUT[4] YOUT[3] YOUT[2] YOUT[1] YOUT[0]
$08
ZOUT8
8 bits output value Z
ZOUT[7] ZOUT[6] ZOUT[5] ZOUT[4] ZOUT[3] ZOUT[2] ZOUT[1] ZOUT[0]
$09
STATUS
Status registers
--
--
--
--
--
PERR DOVR DRDY
$0A
DETSRC
Detection source registers
LDX
LDY
LDZ
PDX
PDY
PDZ
INT1
INT2
$0B
TOUT
“Temperature output value” (Optional) TMP[7] TMP[6] TMP[5] TMP[4] TMP[3] TMP[2] TMP[1] TMP[0]
$0C
$0D
I2CAD
(Reserved)
I2C device address
--
I2CDIS
--
DAD[6]
--
DAD[5]
--
DAD[4]
--
DAD[3]
--
DAD[2]
--
DAD[1]
--
DAD[0]
$0E
USRINF
User information (Optional)
UI[7]
UI[6]
UI[5]
UI[4]
UI[3]
UI[2]
UI[1]
UI[0]
$0F
WHOAMI
“Who am I” value (Optional)
ID[7]
ID[6]
ID[5]
ID[4]
ID[3]
ID[2]
ID[1]
ID[0]
$10
XOFFL
Offset drift X value (LSB)
XOFF[7] XOFF[6] XOFF[5] XOFF[4] XOFF[3] XOFF[2] XOFF[1] XOFF[0]
$11
XOFFH
Offset drift X value (MSB)
--
--
--
--
--
XOFF[10] XOFF[9] XOFF[8]
$12
YOFFL
Offset drift Y value (LSB)
YOFF[7] YOFF[6] YOFF[5] YOFF[4] YOFF[3] YOFF[2] YOFF[1] YOFF[0]
$13
YOFFH
Offset drift Y value (MSB)
--
--
--
--
--
YOFF[10] YOFF[9] YOFF[8]
$14
ZOFFL
Offset drift Z value (LSB)
ZOFF[7] ZOFF[6] ZOFF[5] ZOFF[4] ZOFF[3] ZOFF[2] ZOFF[1] ZOFF[0]
$15
ZOFFH
Offset drift Z value (MSB)
--
--
--
--
--
ZOFF[10] ZOFF[9] ZOFF[8]
$16
MCTL
Mode control
LPEN DRPD SPI3W STON GLVL[1] GLVL[0] MOD[1] MOD[0]
$17
INTRST
Interrupt latch reset
--
--
--
--
--
--
CLRINT2 CLRINT1
$18
CTL1
Control 1
--
THOPT ZDA
YDA
XDA INTRG[1] INTRG[0] INTPIN
$19
CTL2
Control 2
--
--
--
--
--
DRVO
PDPL
LDPL
$1A
LDTH
Level detection threshold limit value LDTH[7] LDTH[6] LDTH[5] LDTH[4] LDTH[3] LDTH[2] LDTH[1] LDTH[0]
$1B
PDTH
Pulse detection threshold limit value PDTH[7] PDTH[6] PDTH[5] PDTH[4] PDTH[3] PDTH[2] PDTH[1] PDTH[0]
$1C
PW
Pulse duration value
PD[7]
PD[6]
PD[5]
PD[4]
PD[3]
PD[2]
PD[1]
PD[0]
$1D
LT
$1E
TW
Latency time value
Time window for 2nd pulse value
LT[7]
TW[7]
LT[6]
TW[6]
LT[5]
TW[5]
LT[4]
TW[4]
LT[3]
TW[3]
LT[2]
TW[2]
LT[1]
TW[1]
LT[0]
TW[0]
$1F
(Reserved)
--
--
--
--
--
--
--
--
MMA7455L
14
Sensors
Freescale Semiconductor
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