NXP Semiconductors Freescale TWR-POS-K81 User manual

TWR-POS-K81
Quick Start Guide
Development Kit for Point-of-Sale
Applications using the Kinetis K81 MCU
Tower System
Development
Platform

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Quick Start Guide
Get to Know the TWR-POS-K81
Figure 1: Front side of TWR-POS-K81
SW1
Reset
SW2
NMI/PTA4
D1–D4
LEDs
Character
Segment LCD
Capacitive
Touch PIN Pad

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TWR-POS-K81
Tower System Development Platform
The TWR-POS-K81 development platform is a reference platform for a
payment PIN entry device. This board includes Cirque SecureSense AFE
for secure PIN entry. The design files and associated software show an
example PIN pad application that has been submitted for Payment Card
Industry (PCI) certification. The board is designed to work standalone or as
part of the Freescale Tower System.
Figure 2: Back side of TWR-POS-K81
512 Mbit Serial
Flash QuadSPI
MK81FN256VDC15
Cirque
SecureSense
AFE
K81 USB
Debug
Header
Piezo
Buzzer
Battery
Receptacle
for VBAT

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Quick Start Guide
TWR-POS-K81 Features
• MK81FN256VDC15 MCU
150 MHz ARM®Cortex®-M4 core,
256KB Flash, 256 KB SRAM, 121
XFBGA, with tamper detection and
crypto hardware acceleration
• Tower compatible processor board and
POS reference design
• 20-pin Cortex JTAG connector
• 512 Mbit Twin-Quad On-board QuadSPI
memory @ 3.3V
• 256 Kbit SPI EEPROM
• Cirque secure touch sensor for PIN pad
control
• Capacitive PIN pad
• 2x16 character, dot matrix LCD display
• Four (4) user-controlled status LEDs
• One (1) mechanical push button for reset
• One (1) mechanical push button for non-
maskable interrupt (NMI) or pin interrupt
• Standalone full-speed USB host and
device function
• 3.3V regulator for VDD and VDDIO_E
voltage domains
• Independent, battery-operated power
supply for real-time clock (RTC) module
• Piezo buzzer
Expanded Software and Tools
Now Available for Kinetis MCUs
Documentation and software specific to
the TWR-POS-K81 platform is monitored
and available only through a secure
download process. To request access,
please contact your sales representative
or fill out a contact form at
freescale.com/TWR-POS-K81.
Supporting software and tools for
Kinetis MCUs are available online:
• Kinetis Design Studio IDE at
freescale.com/kds
• Bootloader for Kinetis MCUs at
freescale.com/kboot

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Step-by-Step Installation Instructions
In this Quick Start Guide, you will learn how to set up the TWR-POS-K81 board and
run the included demonstrated software.
1Download Software
and Tools
Download and install the KSDK for TWR-
POS-K81 software. See expanded software
and tools now available for Kinetis MCUs
section for information on how to get access
to the software if you do not have it already.
2Configure
the Hardware
Connect one end of the USB cable to
the PC and the other end to micro-AB
connector (J55) on the TWR-POS-K81
board. Allow the PC to automatically
configure the USB drivers if needed.
3Connect
a Terminal
Open a terminal emulator program of your
choice (TeraTerm, HyperTerm, etc.) and
connect to the board using the enumerated
Virtual COM port as shown below. If you
don’t see an option for the Virtual COM
port, then follow the directions at the end
of this document to install the driver.
NOTE: The number for the COM port can vary.
NOTE: Any previously active connection should be
terminated before plugging in the board. Failure to
do this may result in the COM port not showing up.

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Quick Start Guide
Step-by-Step Installation Instructions (cont.)
4Configure
the Terminal
Setup the terminal for 115200 8-N-1
communication with no flow control:
5Enter PIN
Entry Mode
Press any key in the terminal window to
place the system into PIN entry mode.
6Enter a
4-Digit PIN
Use the capacitive PIN pad on the board
to input any 4-digit value. Press the “Enter”
button on the PIN pad when complete.
7View
Results
The encrypted PIN block information
will be displayed on the terminal.
Example below.

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Jumper Option Setting Description
J50 Main 5V Power
Selection
2-4 Use 5V from USB connector (5V0_K81_USB)
3-4 Use 5V supply from elevator (P5V_ELEV)
J51
K81 3.3V
Regulator Source
Selection
3-4 Use 5V from USB connector (5V0_K81_USB)
4-6 Use 5V supply from elevator (P5V_ELEV)
2-4 Use elevator USB0_VBUS
J54 3.3V Board Power
Selection
3-4 Use on-board 3.3V regulator
2-4 Use K81 3.3V regulator
J56 USB Source
Selection
1-2 Use micro USB on TWR-POS-K81
2-3 Use TWR USB pins
J57, 1-3 Tamper1-Tamper3
Connection
ON Tamper 1 and Tamper 3 signals are connected
(close active tamper loop)
OFF Tamper 1 and Tamper 3 signals are disconnected
(open active tamper loop)
TWR-POS-K81 Jumper Options
The following is a list of all the jumper options. The default installed jumper settings are
indicated in the shaded boxes.

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Quick Start Guide
Jumper Option Setting Description
J57, 2-4 Tamper0-Tamper2
Connection
ON Tamper 0 and Tamper 2 signals are connected
(close active tamper loop)
OFF Tamper 0 and Tamper 2 signals are disconnected
(open active tamper loop)
J57, 5-7 Tamper5-Tamper7
Connection
ON Tamper 5 and Tamper 7 signals are connected
(close active tamper loop)
OFF Tamper 5 and Tamper 7 signals are disconnected
(open active tamper loop)
J57, 7-8 Tamper4-Tamper6
Connection
ON Tamper 4 and Tamper 6 signals are connected
(close active tamper loop)
OFF Tamper 4 and Tamper 6 signals are disconnected
(open active tamper loop)
TWR-POS-K81 Jumper Options (cont.)

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Virtual COM Port Driver Installation Instructions
1Find the MSD_CDC_
Device in the Device
Manager
2Click “Update Driver
Software…”
3Choose
“Browse...”
Then Select “Let me pick…”

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Quick Start Guide
Virtual COM Port Driver Installation Instructions
(cont.)
4Navigate to Your CDC
Driver Location
<install_dir>\examples\frdmk82f\demo_
apps\usb\device\cdc\virtual_com\inf
5Press
“Next”
6Ignore the Warning and
Press “Yes”
NOTE: If you run into driver signature issue on
Windows 8, please refer to the link below: https://
learn.sparkfun.com/tutorials/ disabling-driver-
signature-onwindows-8/disabling-signed-
driverenforcement-on-windows-8.