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Features
• Complete Touchscreen Module:
– Projected Capacitive Multi Touch Controller
– 7in LCD
– 4 Capacitive “Navigation” Keys
– 200 bytes non-volatile serial EEPROM
• Touch:
– Atmel maXTouch™ mXT768E Touch Controller
– Supports up to 10 touches
• Display:
– 800x480 resolution
– ≤30 ms response time
– White LED backlight
– 18-bit RGB
• Navigation Keys:
– Atmel AT42QT1070 QTouch™ Button Sensor IC
• Cover Panel:
– 1.1mm Soda Lime Glass
PDA TM7000:
7in PCAP Touch
Module
1404-3-5
TM7000
2 PDA TM7000: 7in PCAP Touch Module 1404-3-5
Contents
1 Module Overview 4
1.1 PCB Connections 4
1.2 Debug Connector J1 5
1.3 LCD Backlight Power J2 5
1.4 Host Connector J4 6
1.5 Host Connector J5 7
1.6 Host Interface (Combined) J6 8
1.7 Display Flex Connector J8 9
1.8 Touch Sensor Flex Connector J7 10
2 Overview of the 7in PCAP Touch Module 11
2.1 Introduction 11
2.2 Understanding Unfamiliar Concepts 12
2.3 LCD Panel 12
2.3.1 Scan Direction Selection 12
2.3.2 RGB Signal Routing 13
2.4 maXTouch Capacitive Touchscreen Controller 14
2.4.1 maXTouch Controller Interface 15
2.5 QTouch Capacitive Button Controller 15
2.5.1 QTouch Controller Interface 15
2.6 Serial EEPROM 15
3 Getting Started 16
3.1 Hardware Connections 16
3.2 Software 16
3.3 Using the Touch Module 16
3.3.1 Navigation Keys 16
3.3.2 Evaluating the Touch Module 17
4 Specifications 18
4.1 Mechanical Specifications 18
4.2 Absolute Maximum Specifications 20
4.3 Recommended Operating Conditions 20
4.4 DC Specifications 20
4.5 I2C-compatible Bus Specifications 21
4.6 Power Consumption 21
4.7 Part Number 21
5 I2C Basics (I2C-compatible Operation) 22
4 PDA TM7000: 7in PCAP Touch Module 1404-3-5
1 Module Overview
1.1 PCB Connections
Figure 1 - PCB Connectors
NOTE: Insert flex in Connector J6 with contacts facing DOWN.
The following notations are used for pin descriptions:
I
Input only
OD
Open drain output
O
Output only, push-pull
P
Ground or power
MXT
maXTouch touchscreen
QT
QTouch Button Controller
EE
Serial EEPROM
LCD
LCD Panel
NOTE: Inputs and output are defined from the standpoint of the Touch Module.
MXT768E
D S24B 3 3
J4
J1 J2
J7
J5
J6
Touch
Sensor Flex
Host
Debug LCD Power
Host
Combined
Host
J8
Display Flex
Pin 1
Pin 1
Pin 1
Pin 1
Pin 1
Pin 1
PDA TM7000: 7in PCAP Touch Module
5
1.2 Debug Connector J1
Connector J1 carries signals used to debug the MaXTouch Touch Controller and QTouch Button Controller.
Pin
Type
Description
MXT
QT
Pin
Type
Description
MXT
QT
1
P
+5Vdc
6
I/O
I2C SCL
2
O
~QT_CHG
7
-
N/C
3
O
~MXT_CHG
8
P
GND
4
-
N/C
9
O
DBG DATA
5
I
I2C SDA
10
O
DBG CLK
1.3 LCD Backlight Power J2
Connector J2 is used to provide +5Vdc system and LCD backlight power to the touch module when the Connector
J6 host interface is being used. The host interface on connector J6 only provides +3.3Vdc system power. By
contrast, when the TM7000 is connected to the host via connectors J4 and J5, system power and LCD backlight
power is provided through those interfaces.
NOTE: J2 should NOT be used when J4 and J5 are in use.
The mating connector for J2 is a 2.1mm I.D x 5.5mm O.D barrel connector (center positive). A +5Vdc supply
rated for 1A minimum should connected to J2.
Suggested power supplies:
- Phihong PSC12R-050, (+5Vdc, 2A)
- Phihong PSAC05R-050(P), (+5Vdc, 1A)
6 PDA TM7000: 7in PCAP Touch Module 1404-3-5
1.4 Host Connector J4
Connector J4 connects to the host and carries signals between the host and (1) the MaXTouch Touch Controller,
(2) the QTouch Button Controller and (3) LCD Panel.
NOTE: J4 (and J5) should not be used when J6 is in use.
J2 should not be used when J4 (and J5) are in use.
Pin
Type
Description
MXT
LCD
QT
EE
Pin
Type
Description
MXT
LCD
QT
EE
1
P
+3.3Vdc
16
I
LCD_DATA_12
2
P
GND
17
P
GND
3
P
+3.3Vdc
18
I
LCD_DATA_0
4
P
GND
19
I
LCD_DATA_1
5
O
~MXT_CHG
20
I
LCD_DATA_2
6
O
~QT_CHG
21
I
LCD_DATA_3
7
I
I2C SCL
22
I
LCD_DATA_4
8
I/O
I2C SDA
23
I
LCD_DATA_5
9
P
GND
24
I
LCD_DATA_6
10
I
LCD_DATA_15
25
I
LCD_DATA_7
11
P
GND
26
I
LCD_DATA_8
12
I
LCD_DATA_13
27
I
LCD_DATA_9
13
P
GND
28
I
LCD_DATA_10
14
I
LCD_DATA_14
29
I
LCD_DATA_11
15
P
GND
30
P
GND
PDA TM7000: 7in PCAP Touch Module
7
1.5 Host Connector J5
Connector J5 connects to the host and carries signals between the host and (1) the LCD Panel and (2) serial
EEPROM.
NOTE: J5 (and J4) should not be used when J6 is in use.
J2 should not be used when J5 (and J4) are in use.
Pin
Type
Description
MXT
LCD
QT
EE
Pin
Type
Description
MXT
LCD
QT
EE
1
P
+5Vdc
21
P
GND
2
P
GND
22
P
GND
3
P
+5Vdc
23
-
N/C
4
P
GND
24
-
N/C
5
I
LCD_DATA_16
25
-
N/C
6
I
LCD_DATA_17
26
-
N/C
7
I
LCD_DATA_18
27
-
N/C
8
I
LCD_DATA_19
28
I/O
One-Wire Interface
9
I
LCD_DATA_20
29
P
GND
10
I
LCD_DATA_21
30
P
GND
11
I
LCD_DATA_22
31
-
N/C
12
I
LCD_DATA_23
32
-
N/C
13
P
GND
33
-
N/C
14
P
GND
34
-
N/C
15
I
DISP (Display Enable)
35
-
N/C
16
I
Backlight PWM
36
O
Module Presence Detect
17
I
VSYNC
37
-
N/C – See Note 1
18
I
HSYNC
38
-
N/C
19
I
DE
39
P
GND
20
I
PCLK
40
P
GND
Note 1: by populating R5, the touch module’s ~RESET signal is accessible at this pin.
8 PDA TM7000: 7in PCAP Touch Module 1404-3-5
1.6 Host Interface (Combined) J6
Connector J6 connects to the host and carries the combined signals of J4 and J5. It provides an alternate
interface between the host and (1) the MaXTouch Touch Controller, (2) the QTouch Button Controller, (3) LCD
Panel, and (4) serial EEPROM.
When the host interface on connector J6 is used, +5Vdc system power must be provided using Connector J2. See
Section 1.3 for details.
Suggested Flex:
Manufacturer P/N: Wurth Electronics #687 650 100 002
Description: 0.5mm pitch 50 position FFC, Length 100mm
Flex should be inserted Connector J6 with contacts facing DOWN.
NOTE: J6 should not be used when J4 and J5 are in use.
Pin
Type
Description
MXT
LCD
QT
EE
Pin
Type
Description
MXT
LCD
QT
EE
1
I/O
One-Wire Interface
26
I
LCD_DATA_19
2
P
GND
27
P
GND
3
I
LCD_DATA_0
28
I
LCD_DATA_20
4
I
LCD_DATA_1
29
I
LCD_DATA_21
5
I
LCD_DATA_2
30
I
LCD_DATA_22
6
I
LCD_DATA_3
31
I
LCD_DATA_23
7
P
GND
32
P
GND
8
I
LCD_DATA_4
33
I
PCLK
9
I
LCD_DATA_5
34
I
VSYNC
10
I
LCD_DATA_6
35
I
HSYNC
11
I
LCD_DATA_7
36
I
DE
12
P
GND
37
-
N/C
13
I
LCD_DATA_8
38
-
N/C
14
I
LCD_DATA_9
39
-
N/C
15
I
LCD_DATA_10
40
-
N/C
16
I
LCD_DATA_11
41
I
DISP
17
P
GND
42
I
I2C SDA
18
I
LCD_DATA_12
43
I/O
I2C SCL
19
I
LCD_DATA_13
44
O
~MXT_CHG
20
I
LCD_DATA_14
45
O
~QT_CHG
21
I
LCD_DATA_15
46
I
LCD_PWM
22
P
GND
47
I
~RESET
23
I
LCD_DATA_16
48
P
+3.3Vdc
24
I
LCD_DATA_17
49
P
+3.3Vdc
25
I
LCD_DATA_18
50
P
GND
PDA TM7000: 7in PCAP Touch Module
9
1.7 Display Flex Connector J8
Connector J8 connects to the LCD panel flex and carries signals between the host and the LCD Panel.
Pin
Type
Description
Pin
Type
Description
1
O
U/D
21
P
GND
2
O
L/R
22
O
B0
3
P
GND
23
O
B1
4
O
PCLK
24
O
B2
5
P
GND
25
P
GND
6
O
R0
26
O
B3
7
O
R1
27
O
B4
8
O
R2
28
O
B5
9
P
GND
29
P
GND
10
O
R3
30
O
HSYNC
11
O
R4
31
O
VSYNC
12
O
R5
32
O
DE
13
P
GND
33
O
MODE
14
O
G0
34
P
+3.3Vdc
15
O
G1
35
P
+3.3Vdc
16
O
G2
36
P
LED-
17
P
GND
37
P
LED-
18
O
G3
38
O
LCD_PWM
19
O
G4
39
P
LED+
20
O
G5
40
P
LED+
10 PDA TM7000: 7in PCAP Touch Module 1404-3-5
1.8 Touch Sensor Flex Connector J7
Connector J7 connects to the touch sensor flex and carries signals used by the maXTouch controller to detect user
input on the touch sensor.
Pin
Type
Description
Pin
Type
Description
1
P
GND
29
I/O
Y7
2
I/O
X0
30
I/O
Y8
3
I/O
X1
31
I/O
Y9
4
I/O
X2
32
I/O
Y10
5
I/O
X3
33
I/O
Y11
6
I/O
X4
34
I/O
Y12
7
I/O
X5
35
I/O
Y13
8
I/O
X6
36
I/O
Y14
9
I/O
X7
37
I/O
Y15
10
I/O
X8
38
I/O
Y16
11
I/O
X9
39
I/O
Y17
12
I/O
X10
40
I/O
Y18
13
I/O
X11
41
I/O
Y19
14
I/O
X12
42
I/O
Y20
15
I/O
X13
43
I/O
Y21
16
I/O
X14
44
I/O
Y22
17
I/O
X15
45
I/O
Y23
18
I/O
X16
46
I/O
Y24
19
I/O
X17
47
I/O
Y25
20
I/O
X18
48
I/O
Y26
21
P
GND
49
I/O
Y27
22
I/O
Y0
50
I/O
Y28
23
I/O
Y1
51
I/O
Y29
24
I/O
Y2
52
I/O
Y30
25
I/O
Y3
53
I/O
Y31
26
I/O
Y4
54
P
GND
27
I/O
Y5
55
P
GND
28
I/O
Y6
PDA TM7000: 7in PCAP Touch Module
11
2 Overview of the 7in PCAP Touch Module
2.1 Introduction
The 7in PCAP Touch Module is a touchscreen module offering best-in-class projected capacitance multi-touch
functionality combined with a 7in LCD panel. The module is configured for development and evaluation with
several Atmel ARM-based EK solutions as well as development and integration with a custom host system.
For convenience, this module features host interface connectors (J4 and J5) positioned for direct installation on
Atmel ARM-based EK boards.
As shown in Figure 2 below, the module provides host access to several sub-system components to maximize
effective integration.
Figure 2 - Functional Block Diagram
HOST
Touch sensor
LCD Panel
TM7000 - Touch Module
QT1070
Nav Keys
mXT768E
DS24B33
Capacitive Button
Controller
Capacitive Touchscreen
Controller
Serial EEPROM
PCB
J5
J4
J7
J8
J6
12 PDA TM7000: 7in PCAP Touch Module 1404-3-5
2.2 Understanding Unfamiliar Concepts
Throughout this document, the functionality of the module sub-system will be outlined and summarized. However,
the user is encouraged to refer to the resources and documents below in order to gain a more thorough
understanding of each sub-system.
• For a basic overview of I2C communication, refer to Section 5 of this document
• Atmel maXTouch mXT768E Datasheet (www.atmel.com)
• Atmel QTouch QT1070 Datasheet (www.atmel.com)
• Maxim DS24B33 Datasheet (www.maximintegrated.com)
In addition, when developing or evaluating with the Atmel ARM-based EK’s, it is recommended that the user visit
www.at91.com which contains a broad range of resources for the EK’s and the ARM devices they feature.
2.3 LCD Panel
The module provides the host with a direct connection from the host (Connector J6 or Connectors J4 and J5) to the
LCD panel interface (Connector J8). Aside from generating supply voltages for the LED backlight and providing
backlight control to the host, no display panel control is performed by the module.
2.3.1 Scan Direction Selection
The touch module provides a means for configuring the scan direction of the LCD by populating resistors indicated
in Figure 3 below.
Figure 3 – LCD Scan Direction Configuration Resistors
The LCD panel Up/Down scanning direction is configured by populating R69 and R65 as shown in Table 2-1 below.
The LCD panel Left/Right scanning direction is configured by populating R70 and R69 as shown in Table 2-2
below.
Table 2-1 - LCD Up/Down Scanning Selection
R69
R65
Direction
0 Ω
DNP
Up
DNP
0 Ω
Down
Note: Factory setting is scanning “Down”
J8
J6
J5
PDA TM7000: 7in PCAP Touch Module
13
Table 2-2 - LCD Left/Right Scanning Selection
R70
R66
Direction
0 Ω
DNP
Right
DNP
0 Ω
Left
Note: Factory setting is scanning “Right”
2.3.2 RGB Signal Routing
To support use with multiple host EK options, the touch module provides a means for selecting the routing of
LCD_DAT_xx signals to the LCD RGB data signals by populating one of the two groups of resistors indicated in
Figure 4 below.
Figure 4 – RGB Signal Routing Configuration Resistors
Populating resistors R46-R63 selects the Atmel “Series-5 / A5D3x” routing scheme. Populating resistors
R27-R44 selects the Atmel “Islero” routing scheme. The PCB ships with R46-R63 populated – selecting the
“Series-5 / A5D3x” scheme by default.
Details of each scheme are shown in Table 2-3 below.
J8
J6
J5
14 PDA TM7000: 7in PCAP Touch Module 1404-3-5
Table 2-3 – RGB Signal Routing Selection
Series 5/A5D3x
(R46 – R63)
Islero
(R27 - R44)
LCM
LCD_DAT_17
LCD_DAT_23
R5
LCD_DAT_16
LCD_DAT_22
R4
LCD_DAT_15
LCD_DAT_21
R3
LCD_DAT_14
LCD_DAT_20
R2
LCD_DAT_13
LCD_DAT_19
R1
LCD_DAT_12
LCD_DAT_18
R0
LCD_DAT_11
LCD_DAT_15
G5
LCD_DAT_10
LCD_DAT_14
G4
LCD_DAT_9
LCD_DAT_13
G3
LCD_DAT_8
LCD_DAT_12
G2
LCD_DAT_7
LCD_DAT_11
G1
LCD_DAT_6
LCD_DAT_10
G0
LCD_DAT_5
LCD_DAT_7
B5
LCD_DAT_4
LCD_DAT_6
B4
LCD_DAT_3
LCD_DAT_5
B3
LCD_DAT_2
LCD_DAT_4
B2
LCD_DAT_1
LCD_DAT_3
B1
LCD_DAT_0
LCD_DAT_2
B0
Note: Factory setting is “Series 5/A5D3x”
2.4 maXTouch Capacitive Touchscreen Controller
The module touch screen interface is based on the Atmel maXTouch mXT768E Touch Controller and operates
using the touch sensor at connector J7.
The touch controller scans the touch sensor and will signal the host with an active low interrupt signal (~MXT_CHG
on J4 or J6) when new touch data is available. Data communication with the maXTouch controller is performed
over a shared I2C interface (I2C SCL and I2C SDA on J4 or J6). The I2C address of the touch controller can be
configured by populating R12 or R13 (shown below in Figure 5) according to Table 2-4 below. The PCB ships
with R12 populated – thus the I2C address is set to 0x4C by default.
NOTE: The TM7000 does not have pull-up resistors on the I2C SCL and SDA lines. A pull-up resistor for
the maXTouch ~CHG interrupt signal is located at R14.
Figure 5 - Touch Controller I2C Address Selection
J4
PDA TM7000: 7in PCAP Touch Module
15
Table 2-4 - Touch Controller I2C Address Selection
R12
R13
I2C Address
0 Ω
DNP
0x4C
DNP
0 Ω
0x4D
Note: 0x4C is the default I2C address
2.4.1 maXTouch Controller Interface
Details of the maXTouch communication protocol are beyond the scope of this document. However information is
provided in Section 3.2 below to facilitate evaluation and initial development.
This module is pre-loaded with a configuration already optimized for this touch sensor and panel, so the
developer need only focus on interfacing with the device. When developing the maXTouch controller
interface during evaluation and host development, care should be taken to avoid changing the maXTouch
configuration or committing changes to NV storage on the maXTouch controller.
To get started with host interface development, the user is strongly encouraged to leverage existing code available
from the resources outlined in Sections 3.2.
2.5 QTouch Capacitive Button Controller
The module’s “nav key” interface is based on the Atmel QT1070 7-Channel Capacitive Sensor Driver.
The button controller scans the 4 capacitive nav keys (K1, K2, K3 and K4) and will signal the host with an active
low interrupt signal (~QT_CHG on Connector J4 or J6) when a touch event has occurred. Data communication
with the QT1070 controller is performed over a shared I2C interface (I2C SCL and I2C SDA on J4 or J6). The I2C
address of the button controller is 0x1B and cannot be changed.
NOTE: The TM7000 does not have pull-up resistors on the I2C SCL and SDA lines. A pull-up resistor for
the QTouch ~CHG interrupt signal is located at R16.
2.5.1 QTouch Controller Interface
Details of the QTouch communication protocol are beyond the scope of this document. The user is encouraged
to review the QT1070 Datasheet (www.atmel.com).
2.6 Serial EEPROM
The module includes a DS24B33 Serial EEPROM providing 512 bytes of non-volatile storage. Data
communication with the EEPROM is performed over a One-Wire Interface. The EEPROM is not used by another
subsystem on the touch module and can be freely used by the host system for any purpose. For example, Atmel
ARM-based EK’s running Linux or Android operating systems use the pre-programmed contents of the EEPROM
to identify this module type.
NOTE: The user should take care if choosing to overwrite the pre-programmed EEPROM contents. As
noted above, certain builds of Linux or Android targeted for the Atmel ARM-based EKs use the EEPROM
contents to identify the module and may no longer recognize the module. The user is advised to backup
the EEPROM contents before overwriting.
The serial EEPROM communicates via a one-wire interface (One-wire Interface on J5 or J6). Refer to the
DS24B33 Datasheet (www.maximintegrated.com) for details.
16 PDA TM7000: 7in PCAP Touch Module 1404-3-5
3 Getting Started
This module was designed to install on a variety of Atmel ARM-based EK’s including the SAM9X5-EK,
SAM9N12-EK, SAMA5D3x-EK and the SAMA5D3 Xplained. This provides the fastest way to evaluate the
performance of the touchscreen and display using a familiar, full-featured OS.
The following sections provide basic information related to using and evaluating the Touch Module. Visit
Precision Design Associates website ( www.pdaatl.com ) or Atmel’s AT91 Community website ( www.at91.com )
for more information related to this touch module or guidance appropriate for your specific EK.
3.1 Hardware Connections
The module interfaces with the EK board via one of two methods depending on the EK:
the two large dual-row headers, J4 and J5
the flex connector, J6
Refer to the specific EK documentation to determine which method is appropriate.
3.2 Software
Several options exist when developing for the touch module whether targeting a custom host or an Atmel EK.
3.2.1.1 Atmel Software Framework
The Atmel Software Framework (asf.atmel.com) contains examples of code for interfacing with devices in the
maXTouch family of touch controllers. The capabilities of various maXTouch devices may differ, but the basic
communication protocol is common and can be applied to this module.
3.2.1.2 Linux Kernel / Android
The Linux Kernel (www.kernel.org) has included basic support for maXTouch touch devices since version 2.6.36.
The mainline driver has undergone considerable evolution since then.
Atmel hosts the AT91 community website with resources dedicated to developing their EKs for Android
( www.at91.com/android4sam/ ) and Linux ( www.at91.com/linux4sam/ )
In addition, Atmel maintains patches (www.github.com/atmel-maxtouch/linux) which provide numerous out-of-cycle
improvements to the mainline Linux Kernel driver.
3.3 Using the Touch Module
3.3.1 Navigation Keys
When using this module with one of the standard Atmel Android demo builds, the navigation keys function as
shown in Table 3-1 below:
PDA TM7000: 7in PCAP Touch Module
17
Table 3-1 - Navigation Key Function (Android)
Key
Navigation Function
K1
Back
K2
Menu
K3
Home
K4
Power / Sleep
3.3.2 Evaluating the Touch Module
For effective evaluation of the module – the touch sensor and the LCD panel in particular – the user is encouraged to try
the following applications and tools depending on the host OS.
3.3.2.1 Android
The following Android apps available from Google Play:
TouchTest by Moonblink
Dotty by Gerry Steele
Multitouch Visible Test by Battery Powered Games
Screen Test by Amberfog
3.3.2.2 Linux
The user can perform simple touch / drawing test using the ts_test utility that is part of tslib.
18 PDA TM7000: 7in PCAP Touch Module 1404-3-5
4 Specifications
For complete specifications, refer to the datasheets listed in section 2.2 for the various sub-system components
outlined in sections 2.3 through 2.6.
4.1 Mechanical Specifications
Drawings and CAD models available upon request.
Figure 6 - Sensor Only Dimensions
Sensor Assy (P/N: 90-00020-A0) may be purchased individually.
Minimum order quantities apply. Contact PDA for details.
1.1 mm
(Cover Panel)
0.45 mm (Sensor
+ Optically Clear
Adhesive)
0.08 mm
(FPC)
X18,Y0
X0,Y0
X18,Y31
X0,Y31
107.02
( Outline)Substrate
±0.15mm
166.55
( Outline)Substrate
±0.15mm
54.7 mm
(Sensor Substrate
to FPC Edge)
50.4 mm
(FPC Max Width)
28 mm
(FPC Min Width)
NOTE: PCB Contacts
face DOWN as drawn
PIN 1
12 mm
(Cover Panel Edge
to Backprint Viewable)
12 mm
(Cover Panel Edge
to Backprint Viewable)
154 mm
(Backprint Viewable)
93 mm
(Backprint Viewable)
152.4 mm
(LCD Active)
91.44 mm
(LCD Active)
Glass Profile
178mm x 117mm
R3.75mm in corners
PIN 55
Viewed from
user side
User side
LCD side
PDA TM7000: 7in PCAP Touch Module
19
Figure 7 – Module Dimensions
MXT768E
DS2 4B33
50 mm
63.5 mm
(PCB Width)
134.6 mm
(PCB Length)
22 mm
Glass Profile
178mm x 117mm
R3.75mm in corners
9.3 mm
(Cover Panel rear surface
to PCB rear surface)
104 mm
(LCM Frame Width)
104 mm
(LCM Frame Length)
6.6 mm
(Cover Panel rear surface
to LCM rear surface)
13.5mm
20 PDA TM7000: 7in PCAP Touch Module 1404-3-5
4.2 Absolute Maximum Specifications
Parameter
Value
Operating temp
0oC to + 70oC
Storage temp
-40oC to + 85oC
Vdd
-0.5 to +6V
Max continuous pin current, any control or drive pin
±40 mA
Voltage forced onto any pin
-0.5V to (Vdd + 0.5) Volts
CAUTION: Stresses beyond those listed under Absolute Maximum Specifications may cause permanent
damage to the device. This is a stress rating only and functional operation of the device at these or other
conditions beyond those indicated in the operational sections of this specification are not implied. Exposure to
absolute maximum specification conditions for extended periods may affect device reliability.
4.3 Recommended Operating Conditions
Parameter
Value
Vin
5.0V ±5 percent
Supply ripple + noise
±20 mV
4.4 DC Specifications
Vin = 5.0V, Vdd=3.3Vdc, Ta = recommended range, unless otherwise noted
Parameter
Description
Min
Typ
Max
Units
Notes
VIL
Low input logic level
- 0.5
–
0.3 Vdd
V
1.8V <Vdd <3.3V
VHL
High input logic level
0.7 Vdd
–
Vdd + 0.5
V
1.8V <Vdd <3.3V
VOL
Low output voltage
–
–
0.2Vdd
V
VOH
High output voltage
0.8Vdd
–
–
V
IIL
Input leakage current
–
–
1
µA
PDA TM7000: 7in PCAP Touch Module
21
4.5 I2C-compatible Bus Specifications
Parameter
Operation
Touchscreen Controller Address
Selectable: 0x4C or 0x4D
Navigation Key Controller Address
0x1B
Maximum bus speed (SCL)
400 kHz
I2C Specification
Version 2.1
4.6 Power Consumption
Vdd (V)
Mode
Idd (mA)
+3.3Vdc
mXT768E in Free Run, LCD backlight on
maximum intensity
300 max
+5Vdc
650
4.7 Part Number
Part Number
Description
90-00036-A0
TM7000: 7in PCAP Touch Module
22 PDA TM7000: 7in PCAP Touch Module 1404-3-5
5 I2C Basics (I2C-compatible Operation)
5.1 Interface Bus
The device communicates with the host over an I2C-compatible bus, in accordance with version 2.1 of the I2C
specification. The following sections give an overview of the bus; more detailed information is available from
www.i2C-bus.org. Devices are connected to the I2C-compatible bus as shown in Figure 8 both bus lines are
connected to Vdd via pull-up resistors. The bus drivers of all I2C-compatible devices must be open-drain type. This
implements a wired “AND” function that allows any and all devices to drive the bus, one at a time. A low level on
the bus is generated when a device outputs a zero.
Figure 8. I2C-compatible Interface Bus
5.2 Transferring Data Bits
Each data bit transferred on the bus is accompanied by a pulse on the clock line. The level of the data line must be
stable when the clock line is high; the only exception to this rule is for generating START and STOP conditions.
Figure 9. Data Transfer
5.3 START and STOP Conditions
The host initiates and terminates a data transmission. The transmission is initiated when the host issues a START
condition on the bus, and is terminated when the host issues a STOP condition. Between the START and STOP
conditions, the bus is considered busy. As shown in Figure 10 START and STOP conditions are signaled by
changing the level of the SDA line when the SCL line is high.
SDA
SCL
Device 1 Device 2 Device 3 Device n
Vdd
R1 R2
SDA
SCL Data Stable Data Stable
Data Change
PDA TM7000: 7in PCAP Touch Module
23
Figure 10. START and STOP Conditions
5.4 Address Byte Format
All address bytes are 9 bits long. They consist of 7 address bits, one READ/WRITE control bit and an acknowledge
bit. If the READ/WRITE bit is set, a read operation is performed. Otherwise a write operation is performed. An
address byte consisting of a slave address and a READ or a WRITE bit is called SLA+R or SLA+W, respectively.
When the device recognizes that it is being addressed, it acknowledges by pulling SDA low in the ninth SCL (ACK)
cycle.
The most significant bit of the address byte is transmitted first.
Figure 11. Address Byte Format
5.5 Data Byte Format
All data bytes are 9 bits long, consisting of 8 data bits and an acknowledge bit. During a data transfer, the host
generates the clock and the START and STOP conditions. The slave device is responsible for acknowledging the
reception. An acknowledge (ACK) is signaled by the slave device pulling the SDA line low during the ninth SCL
cycle. If the slave device leaves the SDA line high, a NACK is signaled.
Figure 12. Data Byte Format
SDA
SCL
START STOP
SDA
SCL
START 1 2 7 8 9
R/WAddr LSB ACKAddr MSB
SLA+R/W 1 2 7 8 9
R/WAddr LSB ACKAddr MSB
Aggregate
SDA
SDA from
Transmitter
SDA from
Receiver
SCL from
Master STOP or
Next Data ByteData Byte
24 PDA TM7000: 7in PCAP Touch Module 1404-3-5
5.6 Combining Address and Data Bytes into a Transmission
A transmission consists of a START condition, an SLA+R or SLA+W, one or more data bytes and a STOP
condition. The wired “ANDing” of the SCL line is used to implement handshaking between the host and the device.
The device extends the SCL low period by pulling the SCL line low whenever it needs extra time for processing
between the data transmissions.
Figure 13 shows a typical data transmission. Note that several data bytes can be transmitted between the SLA+R
or SLA+W and the STOP.
Figure 13. Byte Transmission
ACK
1 2 7 8 9
Data Byte
SDA
SCL
START
Data
LSB
Data
MSB
R/W
1 2 7 8 9
SLA+R/W
Addr
LSB
Addr
MSB ACK
STOP
PDA TM7000: 7in PCAP Touch Module
25
6 Revision History
TM7000 Datasheet - 20140404.docx : 4/4/2014 5:01:00 PM
4/4/2014 5:01 PM Greg Sullivan
Revision No.
History
Rev1403-1-1
Initial Draft (unreleased)
Rev1403-1-2
Rev1403-1-3
Rev1403-2-4
Preliminary Release (limited release)
Rev1404-3-5
Initial Release
26 PDA TM7000: 7in PCAP Touch Module 1404-3-5
7 Notes
email: sales@pdaatl.com
Precision Design Associates, Inc.
736 Johnson Ferry Rd, Suite C-270
Marietta, GA 30068
USA
tel: (770)-971-4490
url: http://www.pdaatl.com
© 2014 Precision Design Associates. All rights reserved. Atmel®, Atmel logo and combinations thereof, maXTouch®, QTouch®, and others are
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