DATA SHEET - Admatec · 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

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.

mailto:[email protected]

C-Berry28 Product specification Version 1.0

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Revision record

Table 0.1: Revision record

Rev. Date Chapter Description

1.0 2014-08-14 all initial release


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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


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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.)


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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 --


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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


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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:


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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


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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


GND 6 PWR ground



GND 9 PWR ground



BL_PWM 12 I PWM for backlight control


GND 14 PWR ground

RS 15 I register select

'H' = control word 'L' = display data


VCC 17 PWR power supply 3.3V


SDA 19 I/O serial data

GND 20 PWR ground


/RST 22 I reset

SCLK 23 I serial clock

/CS 24 I chip select

GND 25 PWR ground


Female connector: 2x13 pin, 2.54 mm pitch

connect it to Raspberry Pi© Model B port P1


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7 Hardware

7.1 Schematic of C-Berry28

Figure 7.1 : Schematic for C-Berry28

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D

GP

IO15

/RX

DG

PIO

17

GP

IO18

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MG

PIO

21

GP

IO22

/RS

GP

IO23

GP

IO24

GN

D

GP

IO10

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GP

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17

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20

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25

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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


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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.

http://admatec.de/sites/default/files/downloads/C-Berry28.tar.gz

http://admatec.de/sites/default/files/downloads/C-Berry28.tar.gz


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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.


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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.


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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.


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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


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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


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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.

1st Choice for Display Solutions

http://admatec.de/sites/default/files/downloads/precautions_for_lcm_handling.pdf

Documents

DATA SHEET - Admatec · 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