NXP Semiconductors
UM10744
OM13500 & OM13500A user manual
UM10744
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2013. All rights reserved.
User manual
Rev. 1 — 23.September 2013
3 of 14
1. Introduction
This user manual describes the OM13500 and OM13500A demo boards. The boards
consist of a base board, with a plugged in LPCXpresso board which contains the
microcontroller to control the display driver. OM13500 and OM13500A are essentially the
same. The difference lies only in the segment driver which is mounted on the board. Only
one driver can be mounted. For OM13500 this is the PCA9620. The PCA9620 is a
peripheral device which interfaces to almost any Liquid Crystal Display (LCD) with low
multiplex rates. It generates the drive signals for any static or multiplexed LCD containing
up to eight backplanes, 60 segments and up to 480 display elements. On the
OM13500A, PCA8537BH is used instead. This driver generates the drive signals for any
static or multiplexed LCD containing up to eight backplanes, 46 segments and 352
elements. Both display drivers are compatible with most microprocessors or
microcontrollers. PCA9620 communicates via a two-line bidirectional I
2
C-bus. The
PCA8537 can be easily connected to a microcontroller by either the two line I
2
C-bus
(PCA8537AH) or a three-line bidirectional SPI-bus (PCA8537BH). Communication
overheads are minimized using a display RAM with auto-incremented addressing and
display memory switching. Both PCA9620 and PCA8537 feature an internal charge
pump for on-chip generation of the LCD driving voltages. To ensure an optimal and
stable contrast over the full temperature range, also a programmable temperature
compensation has been included.
This board was developed in order to provide a low cost tool to engineers, wishing to
demonstrate and evaluate these LCD drivers, and to get hands-on experience with
writing code for these drivers. Code written using this board can serve as an example for
the final application. This enables rapid prototyping.
Features:
•
Demonstrates PCA9620 (LQFP80) or PCA8537 (TQFP64) LCD driver
•
Features a vertical alignment (VA) display module with integrated backlight
•
Plugged in OM13035 LPCXpresso board with LPC1115 microcontroller
•
3 push buttons
•
User modifiable firmware, In-System/In-Application Programming (ISP/IAP) via
USB.
•
Power supply can be either using 2 AA-batteries, via USB or via an AC
adapter/external power supply. This can also be used for external V
LCD
.
•
Box contents:
o
OM13500 or OM13500A board (marked on the board)
o
OM13035 LPCXpresso board
The 12nc of the OM13500 board is: 9353 014 42598