data sheet - admatec · 17 pwr power supply 3.3v gpio24 18 i/o raspberry pi gpio port sda 19 i/o...
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admatec GmbH Wendenstrasse 29, 20097 Hamburg, Germany
Tel.: +49-40-238533-0, Fax: +49-40-238533-11
Internet: www.admatec.de , Email: [email protected]
LCD Module C-Berry28
DATA SHEET
Product specification V 1.0
This product complies to EU directive 2002/95/EC (RoHS) of January 27th, 2003.
C-Berry28 Product specification Version 1.0
2/18
Revision record
Table 0.1: Revision record
Rev. Date Chapter Description
1.0 2014-08-14 all initial release
C-Berry28 Product specification Version 1.0
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Table of content
Subject Page
1 General data 4
2 Absolute maximum ratings 5
2.1 Electrical absolute maximum ratings 5
2.2 Environmental absolute maximum ratings 5
3 Electrical characteristics 6
3.1 Electrical characteristics of C-Berry28 6
3.2 Electrical characteristics of backlight 6
4 Optical characteristics of TFT 7
5 Block diagram 8
6 Interface description 9
6.1 Interface of C-Berry28 connector X2 and X3 9
7 Hardware 10
7.1 Schematic of C-Berry28 10
7.2 PCB of C-Berry28 11
8 Software 12
8.1 C-Berry28 example 12
8.2 Additional software 14
8.3 Timing characteristics 14
9 Reliability data for TFT 15
9.1 Test condition 15
10 Assembly 16
11 Drawing 17
11.1 Drawing of TFT Module with TFT Adapter 17
12 LCM handling 18
C-Berry28 Product specification Version 1.0
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1 General data Table 1.1: General data
No. Item Content
1. module size 85.0 mm (W) * 56.0 mm (H) * 17 mm (D)
2. active area 43.2 mm (W) * 57.6 mm (H)
3. pixel size 0.18 mm (W) * 0.18 mm (H)
4. number of dots 240 * 3 (RGB) (W) * 320 (H)
5. LCD typ TFT color 262k, transmissive
6. backlight LED white
7. graphic controller ST7789
8. interface 4-wire SPI
9. weight 36g (approx.)
C-Berry28 Product specification Version 1.0
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2 Absolute maximum ratings Within this specification all voltages are referred to ground (GND).
Absolute maximum ratings are defined ratings, which when being exceeded may
cause permanent damage to the device. Moreover, this device is not guaranteed
to operate properly at the maximum ratings. These are stress ratings only and
functional operation of the device at these or any other condition beyond those
indicated under '3 Electrical characteristics' is not implied.
2.1 Electrical absolute maximum ratings Table 2.1: Electrical absolute maximum ratings
Item Symbol Min. Max. Unit Comment
power supply Vcc -0.3 4.0 V --
input voltage VI -0.5 VCC+0.3 V --
static electricity -- -- -- -- see note
Note: LCM should be grounded during handling.
2.2 Environmental absolute maximum ratings Table 2.2: Environmental absolute maximum ratings
Note: Background color might change slightly depending on ambient temperature (Ta).
That phenomenon is reversible.
Item Symbol Min. Max. Unit Comment
operating temperature TOP -20 70 °C --
storage temperature TST -30 80 °C --
C-Berry28 Product specification Version 1.0
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3 Electrical characteristics
3.1 Electrical characteristics of C-Berry28 Table 3.1: Electrical characteristic of C-Berry28
Ta=25°C
Item Symbol Condition Min. Typ. Max. Unit
power supply for
logic Vcc -- 2.6 2.8 3.3 V
input voltage VIH H-level 0.8VCC -- VCC
V VIL L-level GND -- 0.2VCC
power supply
current ICC VCC=2.8V -- 10 -- mA
3.2 Electrical characteristics of backlight Table 3.2: Electrical characteristics of backlight
Item Symbol Min. Typ. Max. Unit Condition
applied forward voltage VAC 3.0 3.2 3.3 V at 100%PWM
applied forward current IAC -- 80 -- mA
C-Berry28 Product specification Version 1.0
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4 Optical characteristics of TFT Table 4.1: Optical characteristics
Ta=25°C
Item Symbol Condition Min. Typ. Max. Unit
viewing angle
Cr≥10 Θ
( ) -- 65 -- °
( ) -- 55 -- °
( ) -- 60 -- °
( ) -- 60 -- °
contrast ratio Cr -- -- 250 -- °
surface luminance of LCM LI at 100% PWM -- 270 -- cd/m²
Note 1: Definition of viewing angle ( )
Note 2: Definition of contrast ratio (Cr)
The brightness is measured with a TOPCON BM-7 at the center point of the TFT.
The contrast is defined by the following equation:
C-Berry28 Product specification Version 1.0
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5 Block diagram
Figure 5.1 : Block diagram of C-Berry28
2.8" TFT LCD240 (RGB) x 320
Controller IC
LED Backlight
GN
D
VCC
/CS
RS
SD
A
SCLK
/RST
VCC_5V
BL_PW
M
C-Berry28 Product specification Version 1.0
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6 Interface description
6.1 Interface of C-Berry28 connector X2 and X3
Table 6.1: LCD interface description
Symbol Pin no. IO Function
VCC 1 PWR power supply 3.3V
VCC_5V 2 PWR power supply 5V
GPIO2 3 I/O raspberry pi GPIO port
VCC_5V 4 PWR power supply 5V
GPIO3 5 I/O raspberry pi GPIO port
GND 6 PWR ground
GPIO4 7 I/O raspberry pi GPIO port
GPIO14 8 I/O raspberry pi GPIO port
GND 9 PWR ground
GPIO15 10 I/O raspberry pi GPIO port
GPIO17 11 I/O raspberry pi GPIO port
BL_PWM 12 I PWM for backlight control
GPIO21 13 I/O raspberry pi GPIO port
GND 14 PWR ground
RS 15 I register select
'H' = control word 'L' = display data
GPIO23 16 I/O raspberry pi GPIO port
VCC 17 PWR power supply 3.3V
GPIO24 18 I/O raspberry pi GPIO port
SDA 19 I/O serial data
GND 20 PWR ground
GPIO9 21 I/O raspberry pi GPIO port
/RST 22 I reset
SCLK 23 I serial clock
/CS 24 I chip select
GND 25 PWR ground
GPIO7 26 I/O raspberry pi GPIO port
Female connector: 2x13 pin, 2.54 mm pitch
connect it to Raspberry Pi© Model B port P1
C-Berry28 Product specification Version 1.0
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7 Hardware
7.1 Schematic of C-Berry28
Figure 7.1 : Schematic for C-Berry28
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C-Berry28 Product specification Version 1.0
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7.2 PCB of C-Berry28
The layout of the C-Berry28 is depicted by Figure 7.2. The connector X2 will be
used to connect the C-Berry28 to the Raspberry Pi Module. On the bottom is an
additional connector X3. It is the same connector as P1 from the Raspberry Pi
module. For detailed information about X2 and X3 see chapter
"6 Interface description".
Figure 7.2 : PCB for C-Berry28
C-Berry28 Product specification Version 1.0
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8 Software
8.1 C-Berry28 example
An example software for C-Berry28 is available for download. Please follow this
> link < or use the following install guide:
start LXTerminal
download the package wget http://admatec.de/sites/default/files/downloads/C-Berry28.tar.gz
unzip the package tar zxvf C-Berry28.tar.gz
compile the test software cd C-Berry28/SW/tft_test
make
start the programm sudo ./tft_test
To use this example it is required that the BCM2835 library is successfully
installed.
C-Berry28 Product specification Version 1.0
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The package contains the folder structure like Figure 8.1.
C-Berry28
doc
C-Berry28.pdf
ST7789.pdf
HW
Schematic_C-Berry28.pdf
SW
bmp
admatec.bmp
tft_test
tft_test.c
bmp.c
bmp.h
ST7789.c
ST7789.h
tft.c
tft.h
examples.c
examples.h
makefile
fb2cberry28
…
Figure 8.1: Folder structure
In the doc folder is the specification of the C-Berry28 and the lcd driver ST7789.
The HW folder contains the schematic of the C-Berry28.
The SW folder contains the source code. The source code consists of ST7789.c,
tft.c, bmp.c, example.c and the corresponding header files, as well as tft_test.c and a makefile. A short description of each file is given in Table 8.1. The program allows displaying BMP files.
C-Berry28 Product specification Version 1.0
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Table 8.1: Functions of the different source files
File Function
bmp.h /
bmp.c
Image processing for showing BMP file on the
TFT. The BMP files must have a dimension of
320 x 240 pixel and a color depth of 24Bit.
ST7789.h /
ST7789.c
Contains the definitions of the ST7789 register
and several functions to control the lcd driver
ST7789.
tft.h /
tft.c
Responsible for the SPI communications and for
the initialization of the GPIO Pins.
examples.h /
examples.c
Contains functions to demonstrate some
opportunities
tft_test.c This file contains the main loop. The program
shows one BMP file on the TFT.
8.2 Additional software
The package will be expanded with additional software examples on demand, like
fb2cberry28.
8.3 Timing characteristics
Please refer to the specification of IC ST7789.
C-Berry28 Product specification Version 1.0
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9 Reliability data for TFT
9.1 Test condition Table 9.1: Test condition
No. Item Condition Standard Note
1. high temp. storage 80°C 240h
appearance
w/o defect
--
2. low. temp storage -30°C 240h --
3. high temp. & high
humid. storage
60°C
90%RH 240h --
4. high temp. operating 70°C 240h --
5. low temp. operating -20°C 240h --
6. thermal shock
30min@-30°C 30min@25°C
(1 cycle)
30min@25°C 30min@80°C
10
cycles
Note 1: In the standard condition, there shall be no practical problem that may
affect the display function. After the reliability test, the product only
guarantees operation, but doesn´t guarantee to fulfill all of the cosmetic
specifications.
Note 2: Before cosmetic and function test, the product must have enough recovery
time, at least 4 hours at room temperature.
C-Berry28 Product specification Version 1.0
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10 Assembly Switch off the power of the Raspberry Pi. Plug the C-Berry28 with the Raspberry
Pi such as shown in the Figure 10.1. The final assembled module is depicted in
Figure 10.2.
Figure 10.1: Plug C-Berry28 to Raspberry Pi
Figure 10.2: Final assembly
C-Berry28 Product specification Version 1.0
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11 Drawing
11.1 Drawing of TFT Module with TFT Adapter
Fig 11.1: Drawing of TFT Module with TFT Adapter
C-Berry28 Product specification Version 1.0
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12 LCM handling LCMs and especially LC-glasses are very fragile and easy to damage.
Please follow this > link < to find a guideline for recommended LCM handling.
Its purpose is to help customers best in handling LCMs correctly to avoid any
malfunction of LCMs due to incorrect handling.
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