Freescale Semiconductor
MCIMX53SMD Board Hardware User’s Guide, Rev. 0
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Three other common JTAG signals used by debugging devices (Return Clock, Data Enable, and Data
Acknowledge) are not used by the i.MX53 processor and are either pulled-up or pulled-down by the
MCIMX53SMD board.
On the MCIMX53SMD board, the logic signals for JTAG are designed to be 1.8V. A 1.8V reference signal from
VLDO8_1V8 is connected to pin 1 of the 20-pin JTAG connector to provide this logic level signal to the
attached debugging device. In addition, a limited amount (~0.5A) of 3.3V power can be supplied to the
debugging device for debugging devices that required power.
5.17.
CMOS Sensor
The MCIMX53SMD board includes a 500 Megapixel CMOS Camera, OV5642, by OmniVision. The i.MX53
processor can configure the OV5642 registers through I2C port, and get the value from an 8-bit data interface.
The MCIMX53SMD board does not support AF function. The developer can use another CMOS module, but
must follow the pin map of the connector. The MCIMX53SMD board uses FX12B-40P-0.4SV from HIROSE.
5.18.
Sensors
The MCIMX53SMD board has four sensors: Accelerometer (MMA8452), eCOMPASS (MAG3112), CAP Touch
Sensor (MRP121), and Light Sensor (ISL29023). These four sensors are connected with three i.MX53 I2C ports:
Accelerometer is connected with I2C1 port, eCOMPASS and CAP Touch Sensor are connected with I2C2 port,
and Light Sensor is connected with I2C3 port.
6.18.1.
Accelerometer
Accelerometer, MMA8452, is an intelligent low power and lower noise, 3 x 3 x 1 mm capacitive micro-
machined accelerometer having 12 bits of resolution. This accelerometer is packed with many flexible user
programmable embedded functions that are available with two configurable interrupt pins. MMA8452 has
user selectable full scales of ±2g/±4g/±8g and it is capable of measuring accelerations with an Output Data
Rate (ODR) of 400 Hz, 200 Hz, 100 Hz, 50 Hz, 12.5 Hz, and 1.563 Hz. These output data rates correspond to
sample intervals from 2.5 ms to 640 ms. The device can be configured to generate inertial wake-up interrupt
signals, when a programmable acceleration threshold is crossed on any of the three sensed axes. Acceleration
and time thresholds of interrupt generators are programmable by the end user.
6.18.2.
eCOMPASS
eCOMPASS, MAG3112, is a small, low-power, 3-axis digital magnetometer. It works by measuring the strength
of a magnetic field, which is a combination of earth’s magnetic field and the magnetic fields of the nearby
objects, including distortions. The device can be used in conjunction with a 3-axis accelerometer to produce
orientation-independent, accurate compass heading information. It features a standard I2C serial interface
output and smart embedded functions.
6.18.3.
CAP Touch Sensor
CAP Touch Sensor, MPR121, is the second generation sensor controller after the initial release of the MPR03x
series devices. The MPR121 features increased internal intelligence in addition to Freescale’s second
generation capacitance detection engine. Some of the major additions include an increased electrode count, a
hardware configurable I2C address, an expanded filtering system with debounce, and completely independent
electrodes with built-in auto configuration. The total number of electrodes is 13, including 12 physical
electrodes and one electrode for proximity detection. Only four electrodes pad on the MCIMX53SMD board:
electrodes for “HOME”,"BACK”,"SEARCH”, and “ENTER”.
