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3.2.2
Sensing Direction and Output Response
The following figure shows the device’s default sensing direction when measuring gravity in a static manner. Also included are
the standard abbreviations or names for the six different orientation modes: portrait up/down, landscape left/right and back/front.
Top View
PU
Pin 1
Gravity
Side View
LL
Xout @ 0 g
Yout @ -1 g
LR
BACK
Zout @ 0 g
Xout @ 0 g
Yout @ 0 g
Zout @ -1 g
PD
Xout @ -1 g
Xout @ 1 g
Yout @ 0 g
Zout @ 0 g
Yout @ 0 g
Zout @ 0 g
FRONT
Xout @ 0 g
Yout @ 0 g
Zout @ 1 g
Xout @ 0 g
Yout @ 1 g
Zout @ 0 g
Figure 3. Sensing direction and output response
3.2.3
Pin Functions
The following table ? summarizes functional options for each pin on this device.
Table 3. Pin functions
Pin #
1
2
3
4
5
6
7
8 (3)
9
Pin Function #1 (1)
BKGD/MS
SCL0
SDA0
RGPIO2
RGPIO3
RGPIO4
Pin Function #2
V DD
RGPIO9
(2)
RESETB
RGPIO0
V SS
RGPIO1
SCL1
SDA1
INT
Pin Function #3
SCLK
SDI
SDO
SSB
Description
Digital power supply
Background-debug / Mode select / RGPIO9
Active-low reset
Serial clock for slave I 2 C / RGPIO0 / Serial clock for slave SPI
Digital ground
Serial data for slave I 2 C / RGPIO1 / SPI serial data input
RGPIO2 / Serial clock for master I 2 C / SPI serial data output
RGPIO3 / Serial data for master I 2 C / SPI slave select
RGPIO4 / Interrupt input
10
RESERVED (Connect to V SS )
(Must be grounded externally.)
11
12
13
14
15
16
RGPIO5
RGPIO6
RGPIO7
RGPIO8
PDB_A
AN0
AN1
V DDA
PDB_B
V SSA
INT_O
TPMCH0
TPMCH1
RGPIO5 / PDB_A / INT_O slave-port interrupt output
RGPIO6 / ADC Input 0 / TPM Channel 0
RGPIO7 / ADC Input 1 / TPM Channel 1
Analog power
RGPIO8 / PDB_B
Analog ground
1.
2.
3.
Pin function #1 represents the reset state of the hardware. Pin functions can be changed via the SIM pin, mux-control registers in Freescale or user firmware.
RESETB is an open-drain, bidirectional pin. Reset must be pulled high at startup. After startup, Reset may be asserted to reset the device.
RGPIO3/SDA1/SSB = Low at startup selects SPI. High at startup selects I 2 C. This is a function of the application boot code, not of the hardware.
MMA955xL
Sensors
Freescale Semiconductor, Inc.
9
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