Plessey Data-Vu PD01000 User manual
www.plesseysemi.com
Tamerton Road, Roborough | Plymouth, Devon | PL6 7BQ, UK |t: + 1752 693 00
PD01000
Data-Vμ™ microLED Display
Development Kit User Gui e
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Contents
Contents ............................................................................................................................... 2
Scope and Introduction ......................................................................................................... 3
Description............................................................................................................................ 3
Related Documents and Specifications................................................................................. 3
Evaluation Kit Contents......................................................................................................... 4
Safety and Safe Operation ................................................................................................ 4
Driver Board.......................................................................................................................... 5
Description ........................................................................................................................ 5
Mechanical Specification ................................................................................................... 6
Electrical Specification....................................................................................................... 6
Mother/base Board Specifications......................................................................................... 7
Electrical Specification....................................................................................................... 7
Display Board Specifications................................................................................................. 8
Mechanical Specification ................................................................................................... 8
Electrical Specification PD01002....................................................................................... 8
Connection and Control Options ........................................................................................... 9
Driver Board Block Diagram .............................................................................................. 9
Electrical Connection Detail............................................................................................... 9
Control, Command Set and Programming Options ............................................................. 11
Button Control ................................................................................................................. 11
Serial Connection – UART & USB ................................................................................... 11
Programming using the Arduino Integrated Design Environment..................................... 13
Segment driver address mapping ....................................................................................... 17
Arrows and Symbols........................................................................................................ 17
Large 7-segment characters and dots ............................................................................. 18
Small 7-segment characters and dots ............................................................................. 20
Appendix A - Driver PCB Schematics ................................................................................. 21
Appendix B - Handling and Safety Instructions ................................................................... 24
Contact ............................................................................................................................... 24
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Scope an Intro uction
This document provides an outline design, specifications and user manual for the Plessey
Data-Vμ™ microLED Evaluation Kit PD01000. The kit contains a microLED display with driver
and control board.
Description
The Plessey Data-Vμ™ microLED Evaluation Kit contains components for the user to
evaluate the Plessey Data-Vμ™ microLED display. The kit can be used standalone to
demonstrate the intensity of the display, or with a computer to evaluate the display
technology in more depth. The display can be integrated into existing optical systems to
evaluate the benefits of Plessey’s Data-Vμ™ microLED displays.
Relate Documents an Specifications
2961 1 - PD01xxx - Data-Vμ™ microLED Chip Advance Product Datasheet
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Evaluation Kit Contents
The PD01000 evaluation kit consists the following (contained within a card box):
•PD01001 (driver board assembly)
•PD01002 (green display module)
•Base module board
•Bluetooth Module (HC-06)
•USB battery
•USB Type-A to Micro-B Cable
•USB Memory Stick
•Printed Quick Start Guide
The PD01001 Driver and Connector set consists of the component populated driver board,
assembled to the display (PD01002) using a Samtec interposer connector board using
screws and alignment pins. The PD01002 display is a PPS 138 green display with normal
orientation on an FR board. The driver board is supplied with Data-Vμ™ firmware which
allows a command line interface over UART/USB.
The PD01001 and PD01002 are supplied assembled, plugged into the PPS 1 base module
(which can be powered by the supplied USB).
Safety an Safe Operation
Operating the isplay on high brightness settings can cause eye amage. When increasing
the brightness o not look irectly at the light source. Do not stare at the light source.
Direct the isplay away from the eyes, e.g. towar a piece of car .
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Driver Boar
Description
Refer to Appendix A for the driver board schematic. The driver board is based around an
ATMega328 microcontroller and is compatible with the Arduino Integrated Design
Environment (IDE). The driver generates a programmable voltage source for the common
anode of the Data-Vμ™ microLED display.
The driver board voltage source is generated from the ATMega328 and is buffered through
an Op-Amp, NMOS voltage follower and can be programmed anywhere between 0V to VDD
(norm 5V).
The symbols can then be individually turned on by switching an NMOS to ground. There is
an array of 2 dual NMOS transistors to allow up to 8 symbols to be dimmed
independently. The gates of the NMOS array is controlled by two LT8500 PWM chips. These
chips have 8 individually controllable PWM channels with 12 bit resolution. The PWM is
supplied a 2MHz clock generated by the ATMega328, resulting in a PWM frequency of
2MHz/ 095 = 88Hz.
The LT8500 ICs also allow a duty cycle correction to be applied to each channel. This is a 6
bit correction which allows a duty cycle variation of 0.5x – 1.5x. Refer to the LT8500
datasheet for more information on calculating the calibration values
(https://www.analog.com/media/en/technical-documentation/data-sheets/LT8500.pdf)
The ATMega328 can be connected by UART over USB using the driver board’s FTDI chip.
Reprogramming over USB is supported by the bootloader present on the ATMega328. Only
one UART port is present on the ATMega328 and is shared by direct UART connection and
via the FTDI for USB connection; communicate by UART or USB, the ATMega328 cannot
communicate with both simultaneously.
To measure the current of the display measure the voltage drop across R1 , the 1 Ohm (+/-
0.25%) current sense resistor. This can be accessed from the VDEV, VCOM pins. The display
can be driven with an external power supply if required – connect an external power supply
to VCOM and de-solder the current sense resistor R1 . The current sense resistor may be
bypassed using a zero Ohm resistor in R1 position or by shorting resistor R13.
The driver board is connected to the display using a Samtec Z-Ray. This consists of an
interposer and a pair of screws and alignment pins.
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Mechanical Specification
Electrical Specification
Parameter Minimum Typical Maximum Units
Supply Voltage 5.0 5.25 Volts
Supply Current (TBC) Amps
Current per
channel
(TBC) Amps
Microcontroller
operating
frequency
8 MHz
Channel PWM
frequency
2 MHz
Channel PWM
resolution
12 bits
Number of
channels
8
UART 9600 Baud
62
58
22
18
Ø 1.8
Ø 1.0
Ø 1.3
14.3
12.3
2.9
2.1
6.25
4.15
Ø 0.7
4.6
Top View
-
All dimensions in mm
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Mother/base Boar Specifications
The USB battery is supplied partly charged, it is advised to fully charge prior to use. When
charged, insert the battery’s USB Micro-B plug into the base module. Do not connect to the
driver board USB when the battery is in use.
Electrical Specification
Parameter Minimum Typical Maximum Units
Supply Voltage 5.0 5.25 Volts
Supply Current Amps
Battery
Capacity
3 Ah
Battery Charge
Current (USB)
1 Amps
Battery Charge
Time
Hours
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Display Boar Specifications
Refer to display PD01xxx Data-Vμ™ microLED Chip Advance Product Datasheet for full
information.
Mechanical Specification
Electrical Specification PD01002
Parameter Minimum Typical Maximum Units
Forward
Voltage
3 Volts
Dominant
Wavelength
500 555 nm
Current per
channel
Amps
Number of
segments
61
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Connection an Control Options
Driver Boar Block Diagram
Electrical Connection Detail
The driver board connections consist of a microUSB socket and 17 pins on a 0.1” pitch,
connections and major components shown below.
Pin Function
RESET Device reset (active HIGH?) – TTL levels
SCK SPI connection clock – TTL levels
USB
FT232
ATMega328
Samtec
Connector
LT8500
LT8500
NMOS array
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MOSI SPI data input (Master Output Slave Input) – TTL levels
MISO SPI data output (Master Input Slave Output) – TTL levels
GND Ground connection (0V)
VCC Supply Voltage (+5V) – do not connect if microUSB providing power
Tx UART transmit (data from driver board) – TTL levels
Rx UART receive (data to driver board) – TTL levels
SDA I2C data – TTL levels
SCL I2C clock – TTL levels
GPIOx General Purpose I/O to microcontroller, or button inputs – TTL levels
GND Ground connection (0V)
VDEV LED drive voltage – high side of current sense resistor
COM LED common – anode of display (can be used to power display by
removing R1 )
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