About the module Multiplexed GPIO
ConnectCore for i.MX51 Hardware Reference Manual
51
Interfaces
1-Wire
The ConnectCore for i.MX51 provides a 1-Wire communication interface. The module sends or receives
one bit at a time. The required protocol for accessing the generic 1-Wire device is defined by Maxim.
The main features of the 1-Wire interface are the following:
n Performs the 1-Wire bus protocol to communicate with an external 1-Wire device
n Provides a clock divider to generate a 1-Wire bus reference clock
Accelerometer
The module provides a three axis digital output accelerometer. This device is connected to the i.MX51
through the I
2
C bus. The I
2
C device address of the accelerometer is the following:
Interface I2C Address (7 bits)
Accelerometer (MMA7455L) 0 x 1D
The main features of the accelerometer device are the following:
n User assigned registers for offset calibration
n Programmable threshold interrupt output
n Level detection for motion recognition (shock, vibration, freefall)
n Pulse detection for single or double pulse recognition
n Selectable sensitivity (±2g, ±4g, ±8g) for 8-bit mode
ADC and touch screen
The module provides an eight channel 10-bit ADC. The ADC/Touch interface is integrated in the
MC13892 power management device. You can use this ADC as a standard ADC or as a touch screen
interface.
The ADC runs at approximately 2MHz, and it has an auto calibration circuit which reduces the offset
and gain errors.
The main features of the ADC are the following:
n Resolution: 10-bit
n Differential linearity error: 1 LSB
n Integral linearity error: 3 LSB
n Conversion time per channel: 10 us
n Low power consumption (1 mA of conversion current)
n Analog input range: 0 ~ 2.4V
n Five channels pre-assigned to battery interface measurements
n Internal voltage scaling for pre-assigned measurements
n Normal conversion mode and touch screen mode
n The following table shows the ADC channel assignment in ADC and touch screen modes:
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