Features
• Complete Touchscreen Module:
•
•
•
•
– Projected Capacitive Multi Touch Controller
– 7in LCD
– 4 Capacitive “Navigation” Keys
– 200 bytes non-volatile serial EEPROM
Touch:
– Atmel maXTouch™ mXT640T 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 Dragontrail™
PDA TM7000B:
7in PCAP Touch
Module
P/N: 90-00106-A0
Doc: 111-00217-A2
TM7000B
Visit http://www.pdaatl.com/tm7000b
for the latest information on the TM7000B
© Copyright Precision Design Associates
© Copyright Precision Design Associates
Contents
1
2
Module Overview
1.1
PCB Connections
4
1.2
LCD Backlight Power J1
5
1.3
Host Connector J3
6
1.4
Host Connector J5
7
1.5
Host Interface (Combined) J6
8
1.6
Display Flex Connector J7
9
Overview of the 7in PCAP Touch Module
Introduction
10
2.2
Understanding Unfamiliar Concepts
11
2.3
LCD Panel
11
2.3.1
Scan Direction Selection
11
2.3.2
RGB Signal Routing
12
maXTouch Capacitive Touchscreen Controller
2.4.1
2.5
2.5.1
2.6
4
2
10
2.1
2.4
3
4
13
maXTouch Controller Interface
13
QTouch Capacitive Button Controller
14
QTouch Controller Interface
Serial EEPROM
14
14
Getting Started
15
3.1
Hardware Connections
15
3.2
Software
15
3.3
Using the Touch Module
15
3.3.1
Navigation Keys
15
3.3.2
Evaluating the Touch Module
16
Specifications
17
4.1
Mechanical Specifications
17
4.2
Absolute Maximum Specifications
19
4.3
Recommended Operating Conditions
19
4.4
DC Specifications
19
4.5
I2C-compatible Bus Specifications
20
4.6
LCM Specification
20
4.6.1
LCM Parameters
20
4.6.2
LCM Absolute Maximum Specifications
21
4.6.3
LCM DC Specifications
21
4.6.4
LCM Optical Characteristics
21
PDA TM7000B:
7in PCAP Touch Module
Doc:111-00217-A2
PDA TM7000B:
5
7in PCAP Touch Module
4.7
Power Consumption
22
4.8
Part Number
22
I2C Basics (I2C-compatible Operation)
23
5.1
Interface Bus
23
5.2
Transferring Data Bits
23
5.3
START and STOP Conditions
23
5.4
Address Byte Format
24
5.5
Data Byte Format
24
5.6
Combining Address and Data Bytes into a Transmission
25
6
Revision History
26
7
Notes
27
© Copyright Precision Design Associates
3
© Copyright Precision Design Associates
1
Module Overview
1.1 PCB Connections
LCD Power
DS24 B33
Combined
Host
J6
Pin 1
J5
Pin 1
Pin 1
Pin 1
Host
J3
Host
J1
J7
Display Flex
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
O
Output only, push-pull
MXT
EE
maXTouch touchscreen
Serial EEPROM
OD
Open drain output
P
Ground or power
QT
LCD
QTouch Button Controller
LCD Panel
NOTE: Inputs and output are defined from the standpoint of the Touch Module.
4
PDA TM7000B:
7in PCAP Touch Module
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PDA TM7000B:
7in PCAP Touch Module
1.2 LCD Backlight Power J1
Connector J1 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 TM7000B is connected to the host via connectors J3 and J5, system power and LCD backlight
power is provided through those interfaces.
NOTE: J1 should NOT be used when J3 and J5 are in use.
The mating connector for J1 is a 2.1mm I.D x 5.5mm O.D barrel connector (center positive).
rated for 1A minimum should be used.
A +5Vdc supply
Suggested power supplies:
-
Phihong PSC12R-050, (+5Vdc, 2A)
-
Phihong PSAC05R-050(P), (+5Vdc, 1A)
© Copyright Precision Design Associates
5
© Copyright Precision Design Associates
1.3 Host Connector J3
Connector J3 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: J3 (and J5) should NOT be used when J6 is in use.
Take care to support the PCB when removing the touch module from an EK
6
3
P
4
16
I
LCD_DATA_12
17
P
GND
+3.3Vdc
18
I
LCD_DATA_0
P
GND
19
I
LCD_DATA_1
5
O
~MXT_CHG
20
I
LCD_DATA_2
6
O
~QT_CHG
I
LCD_DATA_3
7
I
I C SCL
21
2
22
I
LCD_DATA_4
2
23
I
LCD_DATA_5
24
I
LCD_DATA_6
25
I
LCD_DATA_7
26
I
LCD_DATA_8
27
I
LCD_DATA_9
28
I
LCD_DATA_10
29
I
LCD_DATA_11
30
P
GND
8
I/O
9
P
I C SDA
GND
10
I
LCD_DATA_15
11
P
GND
12
I
LCD_DATA_13
13
P
GND
14
I
LCD_DATA_14
15
P
GND
PDA TM7000B:
7in PCAP Touch Module
EE
GND
Description
QT
+3.3Vdc
P
Type
LCD
P
2
Pin
MXT
1
EE
Description
QT
Type
LCD
Pin
MXT
J1 should NOT be used when J3 (and J5) are in use.
Doc:111-00217-A2
PDA TM7000B:
7in PCAP Touch Module
1.4 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 J3) should NOT be used when J6 is in use.
Take care to support the PCB when removing the touch module from an EK
+5Vdc
21
P
GND
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
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
One-Wire Interface
18
I
HSYNC
38
-
N/C
19
I
DE
39
P
GND
20
I
PCLK
40
P
GND
EE
2
Description
QT
Type
LCD
Pin
MXT
P
EE
1
Description
QT
Type
LCD
Pin
MXT
J1 should NOT be used when J5 (and J3) are in use.
– See Note 1
Note 1: by populating R3, the touch module’s ~RESET signal is accessible at this pin.
© Copyright Precision Design Associates
7
© Copyright Precision Design Associates
1.5 Host Interface (Combined) J6
Connector J6 implements Atmel’s “XPRO LCD” connector found on various Xplained and Xplained Pro evaluation
kits.
Connector J6 connects to the host and carries the combined signals of J3 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 J1. See
Section 1.2 for details.
Suggested Flex:
Wurth Electronics #687 650 100 002,
Description: 0.5mm pitch 50 position FFC, Length 100mm
See section 2.3.2 for additional information on flex cable options.
Flex should be inserted Connector J6 with contacts facing DOWN.
26
I
LCD_DATA_19
27
P
GND
28
I
LCD_DATA_20
LCD_DATA_1
29
I
LCD_DATA_21
LCD_DATA_2
30
I
LCD_DATA_22
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
1
I/O
2
P
GND
3
I
LCD_DATA_0
4
I
5
I
6
P
Description
One-Wire Interface
GND
42
I
Description
2
2
I C SDA
18
I
LCD_DATA_12
43
I/O
I C 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 TM7000B:
7in PCAP Touch Module
EE
Type
Type
QT
LCD
MXT
EE
QT
LCD
Pin
Pin
17
8
MXT
NOTE: J6 should NOT be used when J3 and J5 are in use.
Doc:111-00217-A2
PDA TM7000B:
7in PCAP Touch Module
1.6 Display Flex Connector J7
Connector J7 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+
© Copyright Precision Design Associates
9
© Copyright Precision Design Associates
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 (J3 and J5) positioned for direct installation on
Atmel ARM-based EK boards. In addition, the module includes Atmel’s “Xplained Pro LCD” connector (J6) for use
with Xplained and XPro evaluation hardware.
As shown in Figure 2 below, several sub-system components are accessible to maximize effective integration.
TM7000B - Touch Module
PCB
Nav Keys
J4
Capacitive
Touchscreen
Controller
J6
J3
QT1070
mXT640T
Capacitive Button
Controller
Sensor Tail
J7
LCD Panel
J5
Touch sensor
HOST
DS24B33
Serial EEPROM
Figure 2 - Functional Block Diagram
10
PDA TM7000B:
7in PCAP Touch Module
Doc:111-00217-A2
PDA TM7000B:
7in PCAP Touch Module
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.
2
• For a basic overview of I C communication, refer to Section 5 of this document
• Atmel maXTouch mXT640T (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 J3 and J5) to the
LCD panel interface (Connector J7). 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.
J6
J7
Figure 3 – LCD Scan Direction Configuration Resistors
The LCD panel Up/Down scanning direction is configured by populating R55 and R58 as shown in Table 2-1 below.
The LCD panel Left/Right scanning direction is configured by populating R56 and R59 as shown in Table 2-2
below.
Table 2-1 - LCD Up/Down Scanning Selection
R55
0Ω
DNP
R58
DNP
0Ω
Direction
Down
Up
Note: Factory setting is scanning “Down”
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11
© Copyright Precision Design Associates
Table 2-2 - LCD Left/Right Scanning Selection
R56
0Ω
DNP
R59
DNP
0Ω
Direction
Left
Right
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.
As an alternative, an adapter flex cable (P/N: 91-00112-A0) is available which handles this signal routing without
the need for soldering and moving resistors on the PCB. Contact PDA for more information.
J6
J7
Figure 4 – RGB Signal Routing Configuration Resistors
Populating resistors R37-R54 selects the Atmel “Series-5 / A5D3x” routing scheme. Populating resistors
R19-R36 selects the Atmel “Islero” routing scheme used on newer A5D4 and A5D2 Xplained and Xplained PRO
kits. The PCB ships with R37-R54 populated – selecting the “Series-5 / A5D3x” scheme by default.
Details of each scheme are shown in Table 2-3 below.
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PDA TM7000B:
7in PCAP Touch Module
Doc:111-00217-A2
PDA TM7000B:
7in PCAP Touch Module
Table 2-3 – RGB Signal Routing Selection
Series 5/A5D3x
“Islero”
(R37 – R54 populated)
(R19 – R36 populated)
LCD_DAT_17
LCD_DAT_16
LCD_DAT_15
LCD_DAT_14
LCD_DAT_13
LCD_DAT_12
LCD_DAT_11
LCD_DAT_10
LCD_DAT_9
LCD_DAT_8
LCD_DAT_7
LCD_DAT_6
LCD_DAT_5
LCD_DAT_4
LCD_DAT_3
LCD_DAT_2
LCD_DAT_1
LCD_DAT_0
LCD_DAT_23
LCD_DAT_22
LCD_DAT_21
LCD_DAT_20
LCD_DAT_19
LCD_DAT_18
LCD_DAT_15
LCD_DAT_14
LCD_DAT_13
LCD_DAT_12
LCD_DAT_11
LCD_DAT_10
LCD_DAT_7
LCD_DAT_6
LCD_DAT_5
LCD_DAT_4
LCD_DAT_3
LCD_DAT_2
LCM
R5
R4
R3
R2
R1
R0
G5
G4
G3
G2
G1
G0
B5
B4
B3
B2
B1
B0
Note: Factory setting is “Series 5/A5D3x”
See the AT91 Linux4SAM website for additional details:
https://www.linux4sam.org/bin/view/Linux4SAM/ConnectModuleFromPDA
2.4 maXTouch Capacitive Touchscreen Controller
The module touch screen interface is based on the Atmel maXTouch mXT640T Touch Controller and operates
using the touch sensor at connector J4.
The touch controller scans the touch sensor and will signal the host with an active low interrupt signal (~MXT_CHG
on J3 or J6) when new touch data is available. Data communication with the maXTouch controller is performed
2
2
2
2
over a shared I C interface (I C SCL and I C SDA on J3 or J6). The I C address of the touch controller is 0x4A.
2
NOTE: The TM7000B has pull-up resistors on the shared I C SCL and SDA lines at R7 and R8 respectively.
A pull-up resistor for the maXTouch ~CHG interrupt signal is located at R4.
2.4.1 maXTouch Controller Interface
Details of the maXTouch communication protocol are beyond the scope of this document.
provided in Section 3.2 below to facilitate evaluation and initial development.
However information is
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.
© Copyright Precision Design Associates
13
© Copyright Precision Design Associates
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 J3 or J6) when a touch event has occurred. Data communication
2
2
2
2
with the QT1070 controller is performed over a shared I C interface (I C SCL and I C SDA on J3 or J6). The I C
address of the button controller is 0x1B and cannot be changed.
2
NOTE: The TM7000B has pull-up resistors on the shared I C SCL and SDA lines at R7 and R8 respectively.
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.
to review the QT1070 Datasheet (www.atmel.com).
The user is encouraged
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 provided by Atmel and 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 back up the EEPROM contents before overwriting.
The serial EEPROM communicates via a one-wire interface (“One-Wire Interface” on J5 or J6).
DS24B33 Datasheet (www.maximintegrated.com) for details.
14
PDA TM7000B:
7in PCAP Touch Module
Refer to the
Doc:111-00217-A2
PDA TM7000B:
7in PCAP Touch Module
3 Getting Started
This module was designed to install on a variety of Atmel ARM-based EK’s including the SAM9X5-EK,
SAM9N12-EK, SAMA5D3-EK, SAMA5D3 Xplained, SAMA5D4-EK, and the SAMA5D4 Xplained Ultra among
others. With prebuilt Linux and/or Android images available for these evaluation platforms, 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 evaluation board via one of two methods depending on the eval hardware:
the two large dual-row headers, J3 and J5 (typically found on full-sized EK kits)
the flex connector, J6 (typically found on Xplained or Xplained Ultra kits)
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
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 on their EKs for Android
( www.at91.com/android4sam/ ) and Linux ( www.at91.com/linux4sam/ )
Finally, Atmel maintains an up-to-date driver (www.github.com/atmel-maxtouch/linux) which includes numerous
out-of-cycle improvements to the mainline Linux Kernel maXTouch driver.
3.2.1.2
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.
3.3 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:
© Copyright Precision Design Associates
15
© Copyright Precision Design Associates
Table 3-1 - Navigation Key Function (Android)
Key
K1
K2
K3
K4
Navigation Function
Back
Menu
Home
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.
16
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7in PCAP Touch Module
Doc:111-00217-A2
PDA TM7000B:
7in PCAP Touch Module
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
Contact PDA for drawings and CAD models available.
1.1mm
(Cover Panel)
165.55mm±0.15mm (Sensor Outline)
7.9mm
0.18mm
(OCA)
0.7mm
(Sensor)
156.6mm±0.2mm (Touch AA)
154 mm (Backprint Viewable)
12 mm
LCD side
User side
57.7mm
4.0 mm
94.44mm±0.2mm (Touch AA)
33.7mm
0.08mm
(FPC)
12 mm
Glass Profile
178mm x 117mm
R3.75mm in corners
93 mm (Backp rint Viewable)
91.44 mm (LCD Active)
102.96mm±0.15mm (Sensor Outline)
152.4 mm (LCD Active)
J1 1
1
J2
0.3mm
(FPC+Stiffener)
21.0mm
142.6mm
Figure 5 - Sensor Only Dimensions
Sensor Assy (P/N: 90-00087-A0) may be purchased individually.
Minimum order quantities apply. Contact PDA for details.
© Copyright Precision Design Associates
17
© Copyright Precision Design Associates
165.0mm
(LCM Frame Length)
139.7mm
(PCB Length)
104.0mm
(LCM Frame Width)
50 mm
63.6mm
(PCB Width)
DS 24B33
13.5mm
21.7 mm
J2
1
J1 1
9.8mm
(Cover Panel rear surface
to PCB rear surface)
Glass Profile
178mm x 117mm
R3.75mm in corners
7mm
(Cover Panel rear surface
to LCM rear surface)
Figure 6 – Module Dimensions
18
PDA TM7000B:
7in PCAP Touch Module
Doc:111-00217-A2
PDA TM7000B:
7in PCAP Touch Module
4.2 Absolute Maximum Specifications
Parameter
Value
Operating temp
0 C to + 70 C
Storage temp
-40 C to + 85 C
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
o
o
o
o
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
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