Texas Instruments TCA8418E User manual
User's Guide
SLVUAA2–August 2014
TCA8418E Keypad Scan EVM
This user’s guide describes the TCA8418E-EVM keypad scan evaluation module (EVM). This guide
contains an introduction, setup instructions, the EVM schematic, top and bottom board layouts, and a bill
of materials (BOM).
Contents
1 Information About Cautions and Warnings............................................................................... 2
2 Items Required for Operation .............................................................................................. 2
3 Items Recommended for Operation....................................................................................... 2
4 Introduction ................................................................................................................... 2
5 Setup .......................................................................................................................... 4
5.1 Header/Jumper Connections Description........................................................................ 4
5.2 LaunchPad Hardware/Firmware Setup ......................................................................... 5
5.3 GUI Software Setup ................................................................................................ 9
5.4 Default Register Settings in the TCA8418E when Using the LaunchPad ................................. 10
5.5 Getting Started Using the TCA8418E-EVM.................................................................... 11
6 Schematic ................................................................................................................... 14
7 Board Layout................................................................................................................ 15
8 Bill of Materials ............................................................................................................. 19
List of Figures
1 TCA8418E-EVM ............................................................................................................. 3
2 Header J5 Connections to TCA8418E Pins (Top View)................................................................ 4
3 Proper Jumper Configuration on the LaunchPad........................................................................ 5
4 Proper Orientation for the TCA8418E-EVM on the LaunchPad. ...................................................... 6
5 Opening Device Manager in Windows.................................................................................... 6
6 Updating Driver Software in Device Manager............................................................................ 7
7 Browsing for the Driver Software .......................................................................................... 7
8 Successful Installation of the MSP430 LaunchPad Drivers............................................................ 7
9 Flashing the MSP430 ....................................................................................................... 7
10 Successfully Flashed MSP430............................................................................................. 8
11 Installing the TCA8418E-EVM GUI........................................................................................ 9
12 TCA8418E-EVM GUI After Connecting the LaunchPad to the Computer ........................................... 9
13 TCA8418E-EVM GUI After Connecting the LaunchPad to the Computer.......................................... 11
14 Key Press Matrix Display While Holding Down the Middle Button (SW12)......................................... 12
15 Main Configuration and Input Register Display ........................................................................ 12
16 Reading Register 0x0E.................................................................................................... 13
17 Result of Reading Register 0x0E ........................................................................................ 13
18 Writing 0xA6 to Register 0x0E............................................................................................ 13
19 Result of Writing 0xA6 to Register 0x0E................................................................................ 13
20 TCA8418E-EVM Schematic .............................................................................................. 14
21 PCB Layer 1 (Top Layer).................................................................................................. 15
22 PCB Layer 2 (GND)........................................................................................................ 16
23 PCB Layer 3 (VCC)........................................................................................................ 17
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Information About Cautions and Warnings
www.ti.com
24 PCB Layer 4 (Bottom Layer).............................................................................................. 18
List of Tables
1 Device and Package Configurations ...................................................................................... 3
2 Default TCA8418E Register Values When Using the LaunchPad................................................... 10
3 Bill of Materials ............................................................................................................. 19
1 Information About Cautions and Warnings
CAUTION
This EVM contains components that can potentially be damaged by
electrostatic discharge. Always transport and store the EVM in its supplied ESD
bag when not in use. Handle using an antistatic wristband. Operate on an
antistatic work surface. For more information on proper handling, see the
Electrostatic Discharge (ESD) application note (SSYA008).
The information in a caution or a warning is provided for your protection. Read each caution and warning
carefully.
2 Items Required for Operation
The following items are required to use the TCA8418E-EVM:
• TCA8418E-EVM
• TCA8418E datasheet (SCPS222)
• One power supply for VCC
– 3.3 V at 100 mA recommended
3 Items Recommended for Operation
The following items are recommended for use with the TCA8418E-EVM:
• MSP430 LaunchPad
– Recommended rev 1.5
– MSP430G2553 installed
• USB standard-A to mini-B cable
• Computer running Microsoft®Windows®7 with 1 available USB port
4 Introduction
This document is the user’s guide for the TCA8418E-EVM. The TCA8418E-EVM can be used as a
standalone system or paired with the MSP-EXP430G2 LaunchPad to facilitate power and I2C
communication. When paired with the LaunchPad, The TCA8418E-EVM GUI can be used to read from or
write to internal registers of the TCA8418E keypad scan IC, allowing the user to control the states of the
I/O pins as well as see key presses in real-time.
Microsoft, Windows are registered trademarks of Microsoft Corporation.
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COL9 COL8 COL7 COL6 COL5 COL4
GND VCC ROW7 ROW6 ROW5 ROW4
COL3 COL2 COL1
ROW3 ROW2 ROW1
COL0
ROW0
J5
Setup
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5 Setup
This section describes the header/jumper connections on the TCA8418E-EVM, installation of the firmware
on the MSP430 LaunchPad, installation of the software (GUI) on the computer, and getting started using
the TCA8418E-EVM with any of the supported devices.
5.1 Header/Jumper Connections Description
5.1.1 TP1: Power Input
Test point TP1 allows power input without the LaunchPad. The range is 1.65 V to 3.6 V.
5.1.2 TP2 and TP3: Ground
Test points TP2 and TP3 are connected to ground.
5.1.3 J1 and J2: MSP430 LaunchPad Interface Headers
Headers J1 and J2 are the connectors for the MSP430 LaunchPad to the TCA8418E-EVM.
5.1.4 J3: I2C Test Points
Header J3 is a test point for SDA and SCL, and allows I2C input when the LaunchPad is not present.
5.1.5 J4: RESET and Interrupt Test Points
Test point J4 is a test point for the RESET input, INT output, and CAD_INT output.
5.1.6 J5: Keypad Extension Header
Header J5 allows extension of the functionality of the TCA8418E-EVM onto a larger keypad or GPIO
expander board.
Figure 2. Header J5 Connections to TCA8418E Pins (Top View)
5.1.7 SW1, SW2, SW3, SW11, SW12, SW13, SW21, SW22, SW23: Keypad Switches
These switches are named in accordance with the Key Value Assignment table in the TCA8418E
(SCPS222) datasheet. They are for ROW0-ROW2 and COL0-COL2, which are programmed as keypad
I/Os, by default, on the TCA8418E-EVM.
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Setup
5.2 LaunchPad Hardware/Firmware Setup
If using the TCA8418E-EVM GUI, the MSP430 LaunchPad board needs to be configured properly in order
to flash the processor with the TCA8418E-EVM firmware. Implement the following steps before using the
TCA8418E-EVM in conjunction with the LaunchPad:
1. With the LaunchPad unplugged, configure the headers on the LaunchPad to be in HW UART mode by
attaching jumpers on the headers indicated by the yellow boxes in Figure 3.
Figure 3. Proper Jumper Configuration on the LaunchPad
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Setup
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2. Place the TCA8418E-EVM on top of the LaunchPad so that all connectors on J1 and J2 of the
LaunchPad are inserted into J1 and J2 of the TCA8418E-EVM and J7 on the TCA8418E-EVM is on
the same side as the mini-USB connector of the LaunchPad.
Figure 4. Proper Orientation for the TCA8418E-EVM on the LaunchPad.
3. Download the firmware (for the MSP430) and software (graphical user interface, or GUI) in a zipped
folder (SLVC601) located on the TCA8418E-EVM webpage on ti.com.
4. Right-click on the zip folder and select Extract All.
5. Click Extract.
6. Plug in the MSP430 LaunchPad to the computer.
7. Open Device Manager (Type “devmgmt.msc” into the Start menu and hit Enter):
Figure 5. Opening Device Manager in Windows
8. Select the MSP430 Application (see Figure 6), right click →Properties, and click Update Driver
Software. The MSP430 Application may appear either in Ports or Other Devices.
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Setup
Figure 6. Updating Driver Software in Device Manager
9. Select Browse my computer.
Figure 7. Browsing for the Driver Software
10. Select the folder where you extracted [SLVC601].zip.
11. Click Next. Click Close after you see the following:
Figure 8. Successful Installation of the MSP430 LaunchPad Drivers
12. Flash the MSP430 by double-clicking TCA8418E_Flasher.bat in the TCA8418E-EVM LaunchPad Files
folder where you extracted [SLVC601].zip.
Figure 9. Flashing the MSP430
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Setup
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13. Verify that the command window says “no errors” and then press any key to close the window. A
successful flash of the firmware results in the following command line prompt:
Figure 10. Successfully Flashed MSP430
14. Press any key to continue.
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Setup
5.3 GUI Software Setup
1. Run setup.exe, located in the TCA8418E_GUI folder. From now on, the TCA8418E software is
available under the Start menu in Programs →Texas Instruments, Inc →TCA8418E.exe.
Figure 11. Installing the TCA8418E-EVM GUI
2. If the GUI does not launch automatically, run the installed TCA8418E-EVM GUI program from the Start
menu.
3. The GUI looks like the following image when it is opened and the LaunchPad is connected:
Figure 12. TCA8418E-EVM GUI After Connecting the LaunchPad to the Computer
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Setup
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5.4 Default Register Settings in the TCA8418E when Using the LaunchPad
Upon startup, the MSP430 LaunchPad configures the TCA8418E to work as a keypad scanner with the
following values:
Table 2. Default TCA8418E Register Values When Using the LaunchPad
Register Register Name Default Value for EVM Comment
0x00 Reserved 0x97 Interrupts enabled (except Overflow)
0x01 CFG 0x00
0x02 INT_STAT 0x00
0x03 KEY_LCK_EC 0x00
0x04 KEY_EVENT_A 0x00
0x05 KEY_EVENT_B 0x00
0x06 KEY_EVENT_C 0x00
0x07 KEY_EVENT_D 0x00
0x08 KEY_EVENT_E 0x00
0x09 KEY_EVENT_F 0x00
0x0A KEY_EVENT_G 0x00
0x0B KEY_EVENT_H 0x00
0x0C KEY_EVENT_I 0x00
0x0D KEY_EVENT_J 0x00
0x0E KP_LCK_TIMER 0xA7
0x0F Unlock1 0x0C Key #12
0x10 Unlock2 0x0C Key #12 – Press twice to unlock
0x11 GPIO_INT_STAT1 0x00
0x12 GPIO_INT_STAT2 0x00
0x13 GPIO_INT_STAT3 0x00
0x14 GPIO_DAT_STAT1 0xFF
0x15 GPIO_DAT_STAT2 0xFF
0x16 GPIO_DAT_STAT3 0x03
0x17 GPIO_DAT_OUT1 0x00
0x18 GPIO_DAT_OUT2 0x00
0x19 GPIO_DAT_OUT3 0x00
0x1A GPIO_INT_EN1 0x00
0x1B GPIO_INT_EN2 0x00
0x1C GPIO_INT_EN3 0x00
0x1D KP_GPIO1 0xFF ROW0 through ROW7: keypad scan
0x1E KP_GPIO2 0xFF COL0 through COL7: keypad scan
0x1F KP_GPIO3 0x00
0x20 GPI_EM1 0x00
0x21 GPI_EM2 0x00
0x22 GPI_EM3 0x00
0x23 GPIO_DIR1 0x00
0x24 GPIO_DIR2 0x00
0x25 GPIO_DIR3 0x00
0x26 GPIO_INT_LVL_1 0x00
0x27 GPIO_INT_LVL_2 0x00
0x28 GPIO_INT_LVL_3 0x00
0x29 DEBOUNCE_DIS_1 0x00
0x2A DEBOUNCE_DIS_2 0x00
0x2B DEBOUNCE_DIS_3 0x00
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Setup
Table 2. Default TCA8418E Register Values When Using the LaunchPad (continued)
Register Register Name Default Value for EVM Comment
0x2C GPIO_PULL1 0x00
0x2D GPIO_PULL2 0x00
0x2E GPIO_PULL3 0x00
5.5 Getting Started Using the TCA8418E-EVM
5.5.1 Evaluating the TCA8418E EVM without the LaunchPad
1. To power the TCA8418E-EVM without the LaunchPad, apply a 3.3-V, 100-mA power supply to TP1
(VCC pin). Although 3.3 V is preferred, the voltage range can be from 1.65 V to 3.6 V.
2. Attach an external microcontroller to J3 to provide SCL and SDA inputs for I2C. Keep in mind that SCL
and SDA are pulled up to VCC on the TCA8418E-EVM through 4.7-kΩresistors. Therefore, using the
same power supply for the microcontroller and the TCA8418E-EVM is recommended.
3. Use the built-in 3x3 keypad on the TCA8418E-EVM or use J5 to attach an external keypad. If attaching
an external keypad, the KP_GPIO registers (0x1D, 0x1E, and 0x1F) should be configured to
accommodate the additional keys.
5.5.2 Evaluating the TCA8418E EVM with the LaunchPad
After completing the steps in Section 5.2, launch the TCA8418E-EVM software. The screen will look like
Figure 13.
Figure 13. TCA8418E-EVM GUI After Connecting the LaunchPad to the Computer
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Setup
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5.5.2.1 Using the Key Press Matrix Display
Connect the TCA8418E-EVM and launch the GUI. The key press matrix display will only work when
KE_IEN (0x01, bit 0) is set to 1. By default, key event interrupts are enabled because KE_IEN (0x01, bit 0)
is set to 1 and the key press matrix display responds in real-time to key presses and releases. Press the
middle button (SW12) on the TCA8418E-EVM and observe the feedback from the display (Figure 14).
Figure 14. Key Press Matrix Display While Holding Down the Middle Button (SW12)
Releasing the key causes the grey box to become white again.
5.5.2.2 Main Configuration and Input Registers
Figure 15. Main Configuration and Input Register Display
The main configuration and input registers are the registers most likely to change while operating the
TCA8418E-EVM. For this reason, they are more prominent on the GUI.
The CFG register contains the interrupt enable bits for different types of interrupts.
The INT_STAT register contains the actual state of each type of interrupt.
The KEY_LCK_EC contains the lock status, can be written to lock the keypad, and counts the number of
key events (in the 4 least significant bits).
KEY_EVENT_A is the top of the first-in first-out (FIFO) stack that records key presses and releases.
KEY_EVENT_A is read automatically when KE_IEN = 1 and a key has been pressed or released.
Whenever one of these four registers is read, the main configuration and input register display updates to
show the newly read value of those registers.
The Read registers 1-4 every second checkbox causes the TCA8418E-EVM GUI to start a timer that will
read registers 1 through 4 every second. The read takes 100 ms. This feature shows how KEY_EVENT_A
and KEY_LCK_EC change every time the registers are read. Disable the KE_IEN bit before checking this
box; otherwise, nothing appears to occur in registers 3 and 4.
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Setup
5.5.2.3 Reading and Writing Registers
All registers in the TCA8418E can be read using the TCA8418E-EVM GUI. Figure 16 shows how to read
register 0x0E:
Figure 16. Reading Register 0x0E
Click the Read Register button and the following appears in the activity log text (Figure 17):
Figure 17. Result of Reading Register 0x0E
Similarly, any register can be written as well. Figure 18 shows how to write 0xA6 to register 0x0E:
Figure 18. Writing 0xA6 to Register 0x0E
The activity log reflects the newly written register:
Figure 19. Result of Writing 0xA6 to Register 0x0E
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1
1
2
2
3
3
4
4
5
5
6
6
D D
C C
B B
A A
1 1
7/22/2014
HVL049A.SchDoc
Sheet Title:
Size:
Mod. Date:
File: Sheet: of
Bhttp://www.ti.com
Contact: http://www.ti.com/support
TCA8418E-EVMProject Title:
Designed for:Public Release
Assembly Variant:Variant name not interpreted
7H[DV,QVWUXPHQWV 2014
Drawn By:
Engineer: Ryan Land
Texas Instruments and/or its licensors do not warrant the accuracy or completeness of this specification or any information contained therein. Texas Instruments and/or its licensors do no
warrant that this design will meet the specifications, will be suitable for your application or fit for any particular purpose, or will operate in an implementation. Texas Instruments and/or its
licensors do not warrant that the design is production worthy. You should completely validate and test your design implementation to confirm the system functionality for your application.
Not in version controlSVN Rev:
HVL049Number: Rev: A
J3
J4
ROW7 A1
ROW6 B1
ROW5 C1
ROW4 D1
ROW3 E1
ROW2 A2
ROW1 C2
ROW0 D2
COL0 E2
COL1 A3
COL2 B3
COL3 C3
COL4 D3
COL5 E3
COL6 A4
COL7 B4
COL8 C4
COL9 D4
GND E4
RESET
A5
VCC
B5
SDA
C5 SCL
D5
INT
E5
CAD_INT
B2
U1
TCA8418EYFPR
5
4
1
2
3
6
7
8
9
10
J1
5
4
1
2
3
6
7
8
9
10
J2
TP1
SDA
SCL
RESET
INT
CAD_INT
VCC
VCC
VCC
VCC
GND
P1.0
P1.1
P1.2
P1.3
RESET
INT
CAD_INT
P2.1
P2.2 P2.3
P2.4
P2.5
SCL
SDA
RST
TST
XOUT
XIN
ROW7
COL9
ROW2
ROW3
ROW4
ROW5
ROW6
COL0
COL1
COL2
COL3
COL4
COL5
COL6
COL7
COL8
INT
SCL
SDA
CAD_INT
RESET ROW1
VCC
ROW0
1
3
56
4
2
7
910
8
12 11
14 13
16 15
18 17
20 19
J5
41 32
SW1
41 32
SW2
41 32
SW3
41 32
SW11
41 32
SW12
41 32
SW13
41 32
SW21
41 32
SW22
41 32
SW23
ROW0
ROW1
ROW2
COL0 COL1 COL2
4.7k
R1 4.7k
R2
10k
R3 10k
R4 10k
R5
GND
)
C1
GND
)
C2
GND
TP2
GND
TP3
GND
VCC is power input to the board. Range is 1.65 V to 3.6 V.
Switch designators named to match Key Value Assignment table in TCA8418E datasheet.
ROW0
ROW1
ROW2
ROW3
ROW4
ROW5
ROW6
ROW7
VCC
GND
COL0
COL1
COL2
COL3
COL4
COL5
COL6
COL7
COL8
COL9
Schematic
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6 Schematic
Figure 20 shows the schematic for the TCA8418E-EVM.
Figure 20. TCA8418E-EVM Schematic
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Bill of Materials
8 Bill of Materials
Table 3 lists the BOM for this EVM.
Table 3. Bill of Materials
Designator Qty Value Description Package Reference Part Number Manufacturer
C1 1 1µF CAP, CERM, 1µF, 16V, ±10%, X5R, 603 GRM188R61C105KA93D Murata
0603
C2 1 0.1µF CAP, CERM, 0.1µF, 16V, ±10%, 402 GRM155R71C104KA88D Murata
X7R, 0402
J1, J2 2 Receptacle 100mil 10x1, Tin, TH Receptacle, 10x1, 100mil, PPTC101LFBN-RC Sullins Connector
Tin Solutions
J3 1 Header, 100mil, 2x1, Gold plated, TH Header, 2x1, 100mil 5-146261-1 TE Connectivity
J4 1 1x3 Header, TH, 100mil, 1x3, Gold plated, PBC03SAAN PBC03SAAN Sullins Connector
230 mil above insulator Solutions
J5 1 Receptacle, 10x2, 100mil, TH 10x2 Receptacle PPPC102LFBN-RC Sullins Connector
Solutions
LBL1 1 Thermal Transfer Printable Labels, PCB Label 1.25"H x THT-13-457-10 Brady
1.250" W x 0.250" H - 10,000 per roll 0.250"W
R1, R2 2 4.7k RES, 4.7kΩ, 5%, 0.1W, 0603 603 CRCW06034K70JNEA Vishay-Dale
R3, R4, R5 3 10k RES, 10kΩ, 5%, 0.1W, 0603 603 CRCW060310K0JNEA Vishay-Dale
SW1–SW3, 9 SWITCH TACTILE SPST-NO 0.02A 6x4.3x6mm EVQ-PAD04M Panasonic
SW11–SW13, 15V, TH
SW21–SW23
TP1, TP2, TP3 3 Header, 100mil, 1pos, Gold, TH Testpoint TSW-101-07-G-S Samtec
U1 1 I2C CONTROLLED KEYPAD SCAN YFP0025ABAB TCA8418EYFPR Texas Instruments
IC WITH INTEGRATED ESD
PROTECTION, YFP0025ABAB
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agents, representatives, affiliates, licensors and their representatives harmless from and against any and all claims, damages, losses,
expenses, costs and liabilities (collectively, "Claims") arising out of, or in connection with, any handling and/or use of EVMs. User’s
indemnity shall apply whether Claims arise under law of tort or contract or any other legal theory, and even if EVMs fail to perform as
described or expected.
Safety-Critical or Life-Critical Applications. If user intends to use EVMs in evaluations of safety critical applications (such as life support),
and a failure of a TI product considered for purchase by user for use in user’s product would reasonably be expected to cause severe
personal injury or death such as devices which are classified as FDA Class III or similar classification, then user must specifically notify TI
of such intent and enter into a separate Assurance and Indemnity Agreement.
This manual suits for next models
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Table of contents
