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Pins and Connections
3.2
Pin descriptions
The following sections provide descriptions of the various pin functions available on the MMA955xL
devices. Ten of the device pins are multiplexed with Rapid GPIO (RGPIO) functions. (See “Rapid GPIO”
on page 239 .) The “Primary Pin Function #1” column of Table 3-1 lists the functions that are active when
the device exits the reset state. The pin mux control registers in the System Integration Module (or SIM)
can be used to change pin assignments for these pins after reset. (See “System Integration Module” on
page 189 .)
3.2.1
V DD and V SS
These are the digital power and ground pins and must be connected to the same voltage. V DD is nominally
1.8V for this device.
3.2.2
V DDA and V SSA
These are the analog-power and ground pins. V DDA is nominally 1.8V for this device and must be filtered
to remove any digital noise that may be present on the supply. V DDA is usually connected to V DD through
an appropriate filtering network.
3.2.3
RESETB
The RESETB pin is an open-drain, bidirectional pin with an internal weak pull-up resistor. At power-up,
it is configured strictly as an input pin. Setting RCSR[DR] (Reset Control and Status Register “Drive
Reset” bit) to 1 will cause the RESET function to become bidirectional. (See “Reset Control and Status
Register” on page 201 .) Using this feature, the MMA955xL platform can reset external devices whenever
it is reset for any purpose other than power-on-reset.
3.2.4
Slave I 2 C: SDA0 and SCL0
These are the slave I 2 C data and clock signals, respectively. The MMA955xL platform may be controlled
via this serial port or through the slave SPI interface.
State at reset: Open-drain, bidirectional in input mode, pull-up resistor disabled.
3.2.5
Master I 2 C: SDA1 and SCL1
These are the master I 2 C clock and data signals, respectively. Because the MMA955xL device contains a
32-bit ColdFire V1 CPU, it is fully capable of mastering other devices in the system via this serial port.
(For details, see “Inter-Integrated Circuit” on page 153 .) This allows the MMA955xL platform to off-load
certain tasks from the main CPU, allowing it to conserve power by entering sleep mode. The MMA955xL
device can then issue a wake-up interrupt to the main CPU when motion is detected by the on-chip
transducer or when a slave device (such as pressure sensor or magnetometer) flags that activity has
occurred.
State at reset: Inactive. SDA1 and SCL1 are secondary functions on RGPIO[3:2], which owns the pins at
reset.
MMA955xL Intelligent, Motion-Sensing Platform Hardware Reference Manual, Rev. 1.0
28
Freescale Semiconductor, Inc.
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