Holtek ESK32-A2A31 User Manual

ESK32-A2A31 2.8 Inch TFT LCD Module

User Manual

Revision: V1.00 Date: February 02, 2018February 02, 2018

Rev. 1.00 2 of 12 February 02, 2018

ESK32-A2A31 2.8 Inch TFT LCD Module
User Manual

Table of Contents

Table of Contents

1 Introduction ............................................................................................................. 5

2 Hardware Layout ..................................................................................................... 5

Communication Interface Switch – SW1 .......................................................................................... 6

Extension Connector – CN2 ............................................................................................................. 6

3 Using the Module .................................................................................................... 7

Tool Preparation ..................................................................................................................... 7

LCD Module Setting ............................................................................................................... 7

Expansion Board Setting ....................................................................................................... 7

Board Assembly ..................................................................................................................... 9

Obtain the Example Program ................................................................................................ 9

Compile and Execute the Program ...................................................................................... 10

4 Schematics ............................................................................................................ 10

2.8 Inches TFT LCD Module – ESK32-A2A31.................................................................................11

Rev. 1.00 3 of 12 February 02, 2018

ESK32-A2A31 2.8 Inch TFT LCD Module
User Manual

List of Tables

List of Tables

Table 1. Communication Interface Switch SW1 ........................................................................................ 6

Table 2. Extension Connector CN2 ........................................................................................................... 6

Table 3. Expansion Board EBI Interface Switches .................................................................................... 8

Rev. 1.00 4 of 12 February 02, 2018

ESK32-A2A31 2.8 Inch TFT LCD Module
User Manual

List of Figures

List of Figures

Figure 1. TFT LCD Module Layout ........................................................................................................... 5

Figure 2. Extension Connector CN2 ......................................................................................................... 6

Figure 3. LCD Module Communication Interface Setting ......................................................................... 7

Figure 4. LCD Module + Expansion Board + Starter Kit ........................................................................... 9

Figure 5. HT32 Firmware Library Download Web Link ........................................................................... 10

Figure 6. 2.8 Inches TFT LCD Module (ESK32-A2A31) Schematic ........................................................11

Rev. 1.00 5 of 12 February 02, 2018

ESK32-A2A31 2.8 Inch TFT LCD Module
User Manual

Introduction

1

Introduction

The ESK32-A2A31 TFT LCD Module is designed for the HT32 series expansion board. It supports
SPI and EBI communication interfaces. The ESK32-A2A31 hardware and software can be used
with the ESK32-20001/ESK32-21001 and the HT32 firmware library, providing users with a
complete development environment with which to learn how to use the EBI and SPI interfaces.

Specications:

▆

Use Himax’s TFT LCD driver IC: HX8347-I (T)

▆

2.8 inch TFT LCD with 65 K colours and 320×240 resolutions

▆

Supports SPI and EBI interfaces

2

Hardware Layout

Figure 1. TFT LCD Module Layout

Rev. 1.00 6 of 12 February 02, 2018

ESK32-A2A31 2.8 Inch TFT LCD Module
User Manual

Hardware Layout

Communication Interface Switch – SW1

Table 1. Communication Interface Switch SW1

Switch No.

Description

1 2 3 4

0 0 0 x 8080 MCU 16-bit parallel

1 0 0 x 8080 MCU 8-bit parallel

ID 0 1 x 3-wire serial interface

x 1 1 x 4-wire serial interface

x: Don‘t care

Extension Connector – CN2

Figure 2. Extension Connector CN2

Table 2. Extension Connector CN2

Pin No. Description Pin No. Description

1 VDD5 2 GND

3 BL_EN 4 NC

5 NC 6 WR/SCL

7 MISO 8 MOSI

9 /CS 10 NC

11 NC 12 /Reset

13 GND 14 VDD33

15 PD0 16 PD1

17 PD2 18 PD3

19 PD4 20 PD5

21 PD6 22 PD7

23 PD8 24 PD9

25 PD10 26 PD11

27 PD12 28 PD13

29 PD14 30 PD15

31 PD16 32 PD17

33 /RD 34 RS

Rev. 1.00 7 of 12 February 02, 2018

ESK32-A2A31 2.8 Inch TFT LCD Module
User Manual

Using the Module

3

Using the Module

Tool Preparation

Users need to prepare the HT32 Series expansion board (ESK32-2x001) and the Starter Kit
(ESK32-30xxx)

LCD Module Setting

Before adjusting the communication interface using SW1, refer to the following descriptions and

gure 3 for the LCD module setting details.

If the MCU uses the EBI interface to drive the LCD module, the LCD module should be selected to

be in the EBI mode by switching SW1 of the LCD module to “0000” (default setting).

If the MCU uses the SPI interface to drive the LCD module, the LCD module should be selected to
be in the SPI mode by switching SW1 of the LCD module to “0010”.

Figure 3. LCD Module Communication Interface Setting

Expansion Board Setting

The expansion board settings, J1, J2 and J3 are associated with the LCD module, refer to table 3 for
more details. Refer to the “ESK32-2x001 Expansion Board User Manual” for details on using this
expansion board.

J1: This is used to select whether the LCD Backlight is controlled by the MCU I/O pins or not.

When the MCU I/O pins are insufcient, J1 can be switched to the BL_ON position, ensuring
that the LCD Backlight is always on.

J2: This is used for the EBI interface read operation and determines the MCU EBI OE pin is

connected to the nRD pin of the LCD module or not. When the LCD module needs to read back
the registers or display the RAM, J2 should be switched to OE.

J3: If the MCU supports the EBI interface, then J3 should be open, otherwise J3 should be shorted.

Rev. 1.00 8 of 12 February 02, 2018

ESK32-A2A31 2.8 Inch TFT LCD Module
User Manual

Using the Module

Table 3. Expansion Board EBI Interface Switches

Jumpers Descriptions

J1

LCD Backlight will always be on

LCD Backlight controlled by I/O pin

J2

The LCD module nRD pin is switched to the EBI OE pin

The LCD module nRD pin is switched to a xed pull high

J3

Short: LCD SPI mode

Open: LCD EBI mode

Rev. 1.00 9 of 12 February 02, 2018

ESK32-A2A31 2.8 Inch TFT LCD Module
User Manual

Using the Module

Board Assembly

The HT32 series expansion board (ESK32-2x001) is connected to the Starter Kit and the 2.8 inch
LCD module, as shown in gure 4.

Figure 4. LCD Module + Expansion Board + Starter Kit

Obtain the Example Program

Download the latest Holtek HT32 Firmware Library. The download web link is shown in gure 5.

Unzip the HT32 Firmware Library after downloading.

Rev. 1.00 10 of 12 February 02, 2018

ESK32-A2A31 2.8 Inch TFT LCD Module
User Manual

Schematics

Figure 5. HT32 Firmware Library Download Web Link

Compile and Execute the Program

Open the LCD example project:

Keil: \example\LCD\LCD28\MDK_ARMvx\Project_xxxxx.uvprojx

IAR: \example\LCD\LCD28\EWARMvx\Project_xxxxx.eww

Compile and execute the LCD example program after which, “Holtek HT32 Series LCD Example”

will appear on the LCD.

4

Schematics

This section shows the LCD module circuitry.

2.8 Inches TFT LCD Module – ESK32-A2A31

Mount only for SPI interfaceMount only for parallel interface

0 0 0 80-System 16-bit

Ⅰ

IM2 IM1 IM0 Interface Mode

0 0 1 80-System 8-bit

Ⅰ

1 0 ID 3-Wire serial

Ⅰ

1 1 X 4-Wire serial

Ⅰ

LED_A

PD0

PD1

PD2

PD3

PD4

PD5

PD6

PD7

PD8

PD9

PD11

PD12

PD13

PD14

PD15

PD16

PD17

SDI

WR/SCL

/RD

/RESET

RS

/CS

WR/SCL

/CS

/RD

RS

EN

/CS

PD0
PD2
PD4
PD6
PD8
PD10
PD12
PD14
PD16
/RD RS

PD17

PD15

PD13

PD11

PD9

PD7

PD5

PD3

PD1

/RESET

WR/SCL
SDISDO

SDO

LED_K1

LED_K2

LED_K3

LED_K4

PD10

PD15

PD14

PD13

PD12

PD11

PD10

PD9

PD8

PD7

PD6

PD5

PD4

PD3

PD2

PD1

PD0

PD16

PD17

LED_A

EN

LED_K1

LED_K2

LED_K3

LED_K4

VDD33

VDD33

VDD33

VDD33

RN1

RP4K7

RN1

RP4K7

182736

45

R3

10K/5%/0603

R3

10K/5%/0603

R8 75/5%/0603R8 75/5%/0603

C3

1uF/0603C31uF/0603

C2 1uF/0603C2 1uF/0603

R1 4K7/0603R1 4K7/0603

R11 75/5%/0603R11 75/5%/0603

R7
4K7/0603R74K7/0603

U1

HT7936U1HT7936

VOUT

1

GND

2

EN3C-

4

VIN

5

C+

6

CN2

LCM HEADER 17X2

CN2

LCM HEADER 17X2

VDD51GND0

2

BL_EN3I2C_SDA

4

I2C_SCL5WR/SCL

6

MISO7MOSI

8

/CS9PENIRQ

10

NC011/RESET

12

GND113VDD33

14

PD0

15

PD1

16

PD2

17

PD3

18

PD4

19

PD5

20

PD6

21

PD7

22

PD8

23

PD9

24

PD1025PD11

26

PD1227PD13

28

PD1429PD15

30

PD1631PD17

32

/RD

33

RS

34

RN2

RP4K7

RN2

RP4K7

182736

45

SW1

SW DIP-4

SW1

SW DIP-4

R10 75/5%/0603R10 75/5%/0603

R9 75/5%/0603R9 75/5%/0603

RN5

RP4K7

RN5

RP4K7

182736

45

C1
1uF/0603C11uF/0603

RN3

RP4K7

RN3

RP4K7

182736

45

R5
4K7/0603R54K7/0603

R4
4K7/0603R44K7/0603

R2 4K7/0603R2 4K7/0603

+

C4

10uF/CASE-A

+

C4

10uF/CASE-A

RN4

RP4K7

RN4

RP4K7

182736

45

CN1

TFT3P4263 /40PIN

CN1

TFT3P4263 /40PIN

LEDA1LEDK12LEDK23LEDK34LEDK45IM06IM17IM28IM39/RESET10DB1711DB1612DB1513DB1414DB1315DB1216DB1117DB1018DB919DB820DB721DB622DB523DB424DB325DB226DB127DB028SDO29SDI30RD31WR/SCL32RS33CS34FMARK35IOVCC36VCC37VCI38GND39NC

40

R6
4K7/0603R64K7/0603

Figure 6. 2.8 Inches TFT LCD Module (ESK32-A2A31) Schematic

Rev. 1.00 12 of 12 February 02, 2018

ESK32-A2A31 2.8 Inch TFT LCD Module
User Manual

Schematics

Copyright© 2018 by HOLTEK SEMICONDUCTOR INC.

The information appearing in this Data Sheet is believed to be accurate at the time
of publication. However, Holtek assumes no responsibility arising from the use of
the specifications described. The applications mentioned herein are used solely for
the purpose of illustration and Holtek makes no warranty or representation that such
applications will be suitable without further modification, nor recommends the use of
its products for application that may present a risk to human life due to malfunction or
otherwise. Holtek's products are not authorized for use as critical components in life
support devices or systems. Holtek reserves the right to alter its products without prior

notication. For the most up-to-date information, please visit our web site at http://www.

holtek.com/en/.