PPC-E7+ User Manual.doc
-8-
Rev 1.3 © 2015 EMAC, Inc.
Note:
When sizing a power supply, make sure to allow for USB Device consumption. A device can potentially
draw 500mA, therefore these devices could use a total of up to 1 amp of power.
2.6
Audio Port
The PPC-E7+ provides Audio Line Out and Line In capability through two standard audio jacks (JK5 & JK6).
Audio Jack JK5 is stereo line level input and Audio Jack JK6 is stereo line level output. The processor interfaces
to the Audio CODEC through its I
2
S interface. Command control of the CODEC is done using the processor’s SPI
interface. The CODEC is the Cirrus CS4271, which is a high performance 24-bit Stereo CODEC offering superior
sound quality.
Both the input and output are line level. You will probably not be able to drive an unamplified speaker although
standard headphones will work. Likewise, an un-amplified microphone probably will not work as an input although
the line out of a CD player will work.
2.7
LCD Brightness Control
The PPC-E7+ offers LCD brightness control that can change the brightness of the LCD via software. The LCD
utilizes LED backlighting. The board provides the backlight with approximately 10 volts at about 220mA. The
processor provides a PWM (SoM pin# 85) that is used to drive the LCD backlight. Changing the duty-cycle of the
PWM directly affects the brightness of the LCD. In addition, the backlight can be turned off or on via SoM port line
GPIO0 (SoM pin#114). This allows screensaver software to automatically turn off the backlight when the unit is
not being used and to automatically turn it back on when the touchscreen is touched.
2.8
MicroSD Card Socket
The PPC-E7+ provides two a high capacity MicroSD sockets. One socket is resident on the Carrier and
accessible from the board coast line, the other is resident on the module. Both sockets are hot-swappable and
can accept a wide variety of Flash Cards. A green activity light (LED LD3) is located towards the left side of the
socket on the Carrier while the socket on the module does not provide a status LED. When the processor is
accessing the Flash card this LED will be lit and the card should not be removed at this time. A card that is written
to by the PPC-E7+ can be read by another computer using an MicroSD card reader. The MicroSD interface is
compatible with Standard and High Capacity MicroSD cards
2.9
Keyboard/Mouse
The PPC-E7+ does not provide a PS/2 type keyboard/mouse interface. However, a USB keyboard and mouse
can be used if required.
2.10
Analog Inputs
The analog inputs are available on HDR1 (see table 5 below) and are labeled as analog_04, analog_05,
analog_06 and analog_07. Note: Using these A/Ds may degrade the touch screen performance and/or accuracy.
2.11
I/O Expansion
The Processor used by the PPC-E7+ provides a number of unused I/O lines. The PPC-E7+ provides access to
these lines on connector HDR1. This 44-pin dual row header contains GPIO lines, SPI bus, I
2
C bus, A/D lineS,
interrupts and power pins. Signal names listed in the table below are the SoM names as defined in the SoM 200
pin specification.
