Pins and Connections
3.1.1
Pin functions
Table 3-1 summarizes functional options for each of the device’s pins.
Table 3-1. Pin functions
Pin #
Pin function
#1 1
Pin function #2
Pin function #3
Description
1
V DD
Digital power supply
RESETB
2
3
BKGD/MS
RGPIO9
2
Background debug/mode select RGPIO9
Active low reset
4
5
6
7
8 3
9
10
11
12
13
14
15
16
SCL0
SDA0
RGPIO2
RGPIO3
RGPIO4
RGPIO5
RGPIO6
RGPIO7
RGPIO8
RGPIO0
V SS
RGPIO1
SCL1
SDA1
INT
RESERVED (Connect to V SS )
PDB_A
AN0
AN1
V DDA
PDB_B
V SSA
SCLK
SDI
SDO
SSB
INT_O
TPMCH0
TPMCH1
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
Must be connected to GND externally
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
26
Pin Function 1 represents the reset state of the device. Pin functions may be changed via the SIM pin mux-control
registers ( “Pin Mux Control Register0” ).
RESETB is an open-drain, bidirectional pin. By default, the output function is not on.
RGPIO3/SDA1/SSB = LOW at startup indicates that SPI should be used as slave instead of the I 2 C module.
MMA955xL Intelligent, Motion-Sensing Platform Hardware Reference Manual, Rev. 1.0
Freescale Semiconductor, Inc.
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