Sensors
Freescale Semiconductor
5
MMA7455L
Table 1. Pin Descriptions
*
This address selection capability is not enabled at the default state. If the user wants to use it, factory programming is required. If activated (pin4
on the device is active).
<$1D= 0001 1101> bit 0 is V
DD
on pin 4
<$1C=0001 1100> bit 0 is GND on pin 4. If the pin is programmed it cannot be left NC.
Figure 2. Simplified Accelerometer Functional Block Diagram
Pin #
Pin Name
Description
Pin Status
1
DVDD_IO
Digital Power for I/O pads
Input
2
GND
Ground
Input
3
N/C
No internal connection. Leave unconnected or connect to Ground.
Input
4
IADDR0
I
2
C Address Bit 0 (optional)*
Input
5
GND
Ground
Input
6
AVDD
Analog Power
Input
7
CS
SPI Enable (0), I
2
C Enable (1)
Input
8
INT1/DRDY
Interrupt 1/ Data Ready
Output
9
INT2
Interrupt 2
Output
10
N/C
No internal connection. Leave unconnected or connect to Ground.
Input
11
N/C
Leave unconnected or connect to Ground.
Input
12
SDO
SPI Serial Data Output
Output
13
SDA/SDI/SDO
I
2
C Serial Data (SDA), SPI Serial Data Input (SDI), 3-wire interface Serial Data Output (SDO) Open Drain/Input/Output
14
SCL/SPC
I
2
C Serial Clock (SCL), SPI Serial Clock (SPC)
Input
