Freescale Semiconductor M9328MX21ADSE 2.3.7 Touchscreen ADC

Configuration and Operation

M9328MX21ADSE User’s Manual, Rev. A

2-8 Freescale Semiconductor

Figure 2-8. Ethernet Interface

2.3.7 Touchscreen ADC

The ADS is equipped with an Analog Devices AD7873BRQZ ADC. The ADC communicates with the

touchscreen of the LCD on the Base board. Variable resistor VR1 on the Base board can be used to change

the VBAT input voltage to the ADC. The i.MX21 communicates with the ADC via the CSPI1 interface.

Setting S1-7 to ON connects CSPI1_SS0 to the ADC chip select. Setting S1-8 to ON connects the ADC

interrupt out to UART3_CTS. Figure2-9 shows the ADC interface.

Figure 2-9. ADC Interface

CS8900A-CQ3Z

RJ45 Connector

Isolation

Transformer

i.MX21

CS_LAN

BA1..3

D0..15

B_OE

B_RW

B_DQM3_EB3

UART3_RTS

SBHE

IOW

IOR

AEN

D0..15

INTRQ0

SA8

SA9

SA0

SA4..7

SA10..19

SA1..3

VCC

CHIPSEL

Y+

X+

VCC

X-

Y-

LCD CONNECTOR

VBAT

DCLK

DOUT

DIN

i.MX21

UART3_CTS PENIRQ

CSPI1_SCLK

CSPI1_MISO

CSPI1_MOSI

CSPI1_SS0

VREF

VR1

AD7873BRQZ

Contents

Main Page Chapter 1 General Information Chapter 2 Configuration and Operation Chapter 3 Support Information Page Page Definitions, Acronyms, and Abbreviations Chapter 1 General Information 1.1 Description 1.2 M9328MX21ADSE Features 1.3 System and User Requirements 1.4 M9328MX21ADSE Diagram General Information CPU BOARDBASE BOARD M9328MX21ADSE Users Manual, Rev. A Freescale Semiconductor 1-3 Figure 1-1. M9328MX21ADSE Application Development System 1.5 ADS Specifications Chapter 2 Configuration and Operation 2.1 Introduction 2.2 Configuring Board Components Table2-1. Component Configuration Settings 2.2.1 Peripheral Selection Switch (S1) Table2-2. S1 Switch Settings Table2-1. Component Configuration Settings (continued) Figure 2-1. Switch S1 S1 2.2.2 Mode/User Switch (S2) Figure 2-2. Switch S2 Table2-3. Boot Mode Switch Settings 2-4 Freescale Semiconductor 2.3 Operation Keypad Board i.MX21 This section describes how the system functions and how to use the boards. 2.3.1 Functional Block Diagram 2.3.3 Memory Map 2.3.4 USB On-The-Go Interface 2.3.5 UART and IrDA Freescale Semiconductor 2-7 Figure 2-7. UARTs and IrDA Interface 2.3.6 Ethernet Buffer UART1 DCE DTE 2.3.7 Touchscreen ADC Figure 2-9. ADC Interface 2.3.8 CD Quality CODEC The WM8731SEDS data sheet is available at http://www.wolfsonmicro.com/ 2.3.9 Keypad Table2-5. Audio Connectors Table2-6. Keypad Layout and Connections 2.3.10 Memory Mapped I/O 2.3.10.1 Input I/O Table2-7. Input Buffer Signals 2.3.10.2 Output I/O Table2-8. Output Latch Functions 2.3.11 Audio Indicator (Buzzer) 2.3.12 LED Indicators 2.4 Using The Board Connectors 2.5 Add-On Module Connections and Usage Table2-10. M9328MX21ADSE Connectors (continued) 2-14 Freescale Semiconductor CPU BOARDBASE BOARD CPU BOARDBASE BOARD Figure 2-10. Installation of the Main Boards Figure 2-11. Installation of the PCMCIA Daughter Card LCD BOARD RIBBON CABLE 20 CONDUCTOR RIBBON CABLE 2.5.1 Using the TFT LCD Display Panel TV ENCODER CARD 2.5.2 Using the Keypad 2.5.3 Using a NAND Flash Card 2.5.4 Using a SD/MMC Card 2.5.5 Using Image Sensor Daughter Card 2.5.6 Using the PCMCIA Daughter Card 2.5.7 Using the TV Encoder Card Page Chapter 3 Support Information 3.1 Introduction 3.2 CPU to Base Board Connectors PX1, PX2, PY1, and PY2 Figure 3-1. CPU to Base Board PX1/PY1 Connector Pin Assignments 3-2 Freescale Semiconductor PX1 Table3-1. CPU to Base Board PX1/PY1 Connector Signals Page Page Page Figure 3-2. CPU to Base Board PX2/PY2 Connector Pin Assignments Freescale Semiconductor 3-7 PX2 Table3-2. CPU to Base Board PX2/PY2 Connector Signals Page Page Page 3.3 CPU to Option Card Connectors Page Table3-3. CPU to Option Card PK1 Connector Signals Figure 3-4. CPU to Option Card PK2 Connector Pin Assignments Table3-4. CPU to Option Card PK2 Connector Signals Table3-4. CPU to Option Card PK2 Connector Signals (continued) 3.4 UART/RS-232 Connectors P1 1 3.4.1 UART1 Connector 2345 9876 3.4.2 UART4 Connector P2 5 4321 6789 3.4.3 External UART Connector 3.5 Multi-ICE Connector Table3-7. Connector P3 (EXT UART) DCE Signal Descriptions RXD TXD RI CTS RTS 2345 9876 3.6 Ethernet Connector Figure 3-9. Ethernet Connector P9 Pin Numbers Table3-8. Multi-ICE Connector P20 (on the CPU) Signal Descriptions Table3-9. Ethernet Connector P9 Signal Descriptions 3.7 USB OTG Connector Figure 3-11. NAND Flash Connector PM1 (on the CPU Board) Pin Assignments Figure 3-10. USB Connector P4 Pin Assignments 3.8 NAND Flash Connector Table3-10. USB OTG Connector P4 Signal Descriptions Figure 3-12. NAND Flash Connector PM2 (on the CPU) Pin Assignments Table3-11. NAND Flash Connector PM1 Signal Descriptions Table3-12. NAND Flash Connector PM2 Signal Descriptions 3.9 External Keypad Connector Figure 3-13. External Keypad Connector P5 Pin Assignments Table3-13. External Keypad Connector P5 Signal Descriptions 3.10 LCD Panel Connector Figure 3-14. LCD Panel Connector P7 Pin Assignments Table3-14. LCD Panel Connector P8 Signal Descriptions 3.11 TV Encoder Connector Figure 3-15. TV encoder Connector P13 Pin Assignments Table3-15. TV encoder Connector P13 Signal Descriptions Table3-14. LCD Panel Connector P8 Signal Descriptions (continued) 3.12 SD/MMC Connector 3.13 Extension and Image Sensor Connectors Figure 3-17. Connectors PE1, PE2, and PE3 Pin Numbering Table3-17. Image Sensor Connector PE1 Signal Description Table3-18. Extension Connector PE2 Signal Description Table3-18. Extension Connector PE2 Signal Description (continued) Table3-19. Extension Connector PE3 Signal Description 3.14 Disposal Information Table3-19. Extension Connector PE3 Signal Description (continued) Page Page How to Reach Us: