PPC-E4-3354_User_Manual.docx
-11-
Rev 1.0 © 2016 EMAC, Inc.
2.6
MicroSD Card Socket
The PPC-E4-3354 provides a high capacity MicroSD socket. This socket is hot-swappable and can accept a wide
variety of Flash Cards. A green activity light (LED LD2) is located towards the left side of the socket. W hen 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-E4-3354, can be read by another computer, using a MicroSD card reader. The
MicroSD interface is compatible with Standard and High Capacity MicroSD cards.
2.7
Keyboard/Mouse
The PPC-E4-3354 does not provide a PS/2 type keyboard/mouse interface. However, a USB keyboard and
mouse can be used if required.
2.8
Analog Inputs
The analog inputs are available on HDR1 (see table below) and are labeled as analg_04, analg_05, analg_06 and
analog_07. Voltages applied to the inputs must be in the range of 0V to 3.3V with reference to ground. Different
operating systems may provide access to the analog inputs differently or even not at all. See the operating
system documentation for details. Note: In some cases using the Analog Inputs can have adverse effect on the
touchscreen sensitivity.
2.9
I/O Expansion
The Processor used by the PPC-E4-3354 provides a number of unused I/O lines. The PPC-E4-3354 provides
access to these lines on connector HDR1. This 20-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.
Table 8
Pin
Signal
Pin
Signal
1
GND
2
3.3V
3
I2DAT
4
I2CLK
5
~RESET_OUT
6
SPI_MISO
7
SPI_CLK
8
SPI_MOSI
9
SPI_CS1
10
SPI_CS0
11
SPI_CS3
12
GPIO07
13
ANALG_05
14
GPIO13
15
ANALG_06
16
IROA
17
ANALG_04
18
GPIO15
19
ANALG_07
20
GPIO12
2.10
Real-Time Clock
The PPC-E4-3354 emulates a real time clock using the internal real time clock on the AM3354 processor. Battery
backup is provided from the carrier board using the VSTBY pin. The real-time clock is a precise timer which can
generate interrupts on intervals specified by the user.
