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Cypress CapSense Express CY3280-MBR, Manual

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CY3280-MBR CapSense Express with SmartSense Auto-Tuning Kit Guide, Doc. # 001-64772 Rev. **

Kit Operation

2.4

Connector Details

2.4.1

SmartSense Evaluation Header (Connector J5)

Various signals are connected to the J5 connector, as shown in the following table. For more infor-
mation on each signal, see the schematics of the CY3280-MBR kit.

VDD and GND are connected to pin #1 and pin #2 on this connector such that external power supply
can be connected to kit, if required. This power supply is not gated through CapSense based power
buttons; therefore, the same voltage applied on the connector reaches the CapSense controller.
When the kit is powered though J5 connector, only CapSense controller is powered, LEDs and other
part of kit do not function.

It is not recommended to power the kit through J5 connector and one of the gated power sources. 

Pin #3 of the J5 connector is connected to reset pin (XRES) of the CapSense controller; providing
logic high signal to this pin resets the CapSense controller.

The remaining two pins (pin #4 and pin #5) are connected to CapSense sensors BTN1 and BTN2,
respectively. This is done to provide an option to increase the capacitance of the sensor and evalu-
ate the SmartSense based auto tuning feature of CY8CMBR2044.

Connector J5 (SmartSense Evaluation Header)

2.4.2

Expansion Connector One (Connector J1)

All the GPO signals are connected to J1 connector, allowing the output signals of CapSense to be
interfaced with host controllers. This is a good option to build a mock design for testing purposes.

All hardware strapping inputs of CY8CMBR2044, except ARST, are connected to connector J1.
These signals can be used to measure the value of the strapping input resistor configured.

One end of the ScanRate/Sleep resistor is connected to pin #1 of J1. When the sleep mode is in
enabled state by making SW2 in Sleep On, the CapSense controller can be made to work in deep
sleep mode by providing recommended logic signal on the pin 1 of J1 connector. Refer the

CY8CMBR2044 data sheet

 for details on how to activate deep sleep mode and reduce the current

consumption of CapSense controller to 100 nA.

Connector J1 (Expansion Connector -1)

J5 - 1

VDD (external only to CapSense controller)

J5 - 2

GND

J5 - 3

XRES

J5 - 4

CS1 (BTN1)

J5 - 5

CS2 (BTN2)

J1 - 1

SLEEP_CNT (control input of ScanRate/Sleep)

J1 - 2

XRES

J1 - 3

DELAY

J1 - 4

TOGGLE/FSS

J1 - 5

GND

J1 - 6

GND

J1 - 7

GPO 0

J1 - 8

GPO 1

J1 - 9

GPO 2

J1 - 10

GPO 3

Summary of Contents for CapSense Express CY3280-MBR

Page 1: ...MBR CapSense Express with SmartSense Auto Tuning Kit Guide Doc 001 64772 Rev Cypress Semiconductor 198 Champion Court San Jose CA 95134 1709 Phone USA 800 858 1810 Phone Intnl 408 943 2600 http www cypress com ...

Page 2: ...ESS FOR A PARTICULAR PURPOSE Cypress reserves the right to make changes without further notice to the materials described herein Cypress does not assume any liability arising out of the application or use of any product or circuit described herein Cypress does not authorize its products for use as critical components in life support systems where a malfunction or failure may reasonably be expected...

Page 3: ...ller 13 3 2 SmartSense Feature 13 3 2 1 Enable SmartSense Feature 13 3 2 2 Test CapSense Buttons with SmartSense Feature Enabled 13 3 3 Toggle Feature 14 3 3 1 Test CapSense Buttons with Toggle Feature Disabled 14 3 3 2 Enable Toggle Feature 15 3 3 3 Test CapSense Buttons with Toggle Feature Enabled 15 3 4 Flanking Sensor Suppression FSS Feature 16 3 4 1 Test CapSense Buttons with FSS Feature Disa...

Page 4: ... Sleep Feature Enabled 21 3 8 ARST Feature 21 3 8 1 Enable ARST Feature 21 3 8 2 Test CapSense Buttons with ARST Feature Enabled 22 3 9 FMEA Features 22 3 9 1 Enable FMEA Feature 22 3 9 2 Test FMEA Feature CapSense Button Short to Ground 22 3 9 3 Test FMEA Feature CapSense Button to Button Short 23 A Appendix 25 A 1 Board Schematics 25 A 2 Board Layouts 27 A 3 Bill of Materials 29 A 4 Frequently A...

Page 5: ...on is required to make the kit work 1 3 Features of CY3280 MBR Kit Board Four CapSense buttons of different dimensions Four LEDs connected to general purpose output pins CapSense based power button and power indicator LED Operates from external power supply and battery Expansion slots allowing I O to expand to external boards 1 4 Factory Default Configuration When shipped this kit is stuck with th...

Page 6: ...er New Displays file locations user entered text and source code C cd icc Italics Displays file names and reference documentation Read about the sourcefile hex file in the PSoC Designer User Guide Bracketed Bold Displays keyboard commands in procedures Enter or Ctrl C File Open Represents menu paths File Open New Project Bold Displays commands menu paths and icon names in procedures Click the File...

Page 7: ...to know how to demonstrate each feature of the CapSense controller using the kit The board has three connectors Connector J5 can be used to demonstrate the SmartSense feature and connectors J1 and J2 are used to provide external power to the kit and connect output signals for CapSense controller to host systems Touch the power button first and ensure the power LED is turned on Each CapSense button...

Page 8: ...200 mV less than what is supplied to the power supply connector J2 due to voltage drop across regulator circuitry External supply to be used should be greater than 2 0 V and lesser than 3 8 V to provide 1 71 V to 3 6 V supply to the CapSense controller 2 2 System Block Diagram and Operation Figure 2 2 shows the block diagram of the CY3280 MBR kit The block diagram has two main sections power suppl...

Page 9: ...e when the external power through J5 is connected Four CapSense buttons and receptive LEDs are connected to the CapSense controller used for demonstration The output signals and hardware strapping inputs are also connected to J1 and J2 connectors This helps to connect them to host and monitor status and control the CapSense con troller 2 3 Controller Pin Assignment Details The following table show...

Page 10: ...This is done to provide an option to increase the capacitance of the sensor and evalu ate the SmartSense based auto tuning feature of CY8CMBR2044 Connector J5 SmartSense Evaluation Header 2 4 2 Expansion Connector One Connector J1 All the GPO signals are connected to J1 connector allowing the output signals of CapSense to be interfaced with host controllers This is a good option to build a mock de...

Page 11: ...s than 3 8 V to provide 1 71 V to 3 6 V supply to the CapSense Controller Connector J2 Expansion Connector 2 2 5 Power the Kit The following steps provide detailed instructions to power the kit Note that these instructions are available in brief in the quick start guide 2 5 1 Insert Battery Two AAA size batteries are provided with the kit Insert these batteries in the battery holder provided on th...

Page 12: ... in Both Off position and SW2 is in Sleep Off position Turn the Delay and Sleep potentiometers to extreme right to disable Delay Off and sleep features of CapSense controller Figure 2 4 Default Configuration 2 SW2 in Sleep Off position 3 Turn DELAY potentiometer to extreme right 4 Turn SLEEP potentiometer to extreme right 1 SW1 in Both Off position ...

Page 13: ...ion 2 5 Power the Kit on page 11 3 2 1 Enable SmartSense Feature CY8CMBR2044 CapSense controller is built around robust CSD capacitive sensing method and patented SmartSense auto tuning algorithm There is no action required to enable SmartSense feature in CY8CMBR2044 CapSense controller It is automatically enabled on power up 3 2 2 Test CapSense Buttons with SmartSense Feature Enabled Touch any Ca...

Page 14: ... works up to 41 pF 3 3 Toggle Feature The following steps help to demonstrate the Toggle feature of CY8CMBR2044 CapSense controller using CY3280 MBR kit Before proceeding power the kit in default mode using the procedure pro vided in the section 2 5 Power the Kit on page 11 3 3 1 Test CapSense Buttons with Toggle Feature Disabled Touch a CapSense button the respective LED turns on When you release...

Page 15: ... Feature Enabled Touch any CapSense button the respective LED turns on When the finger is released from the but ton the LED remains in the ON state If the same button is pressed again the LED turns off and remains in same state when finger is released At the next touch the LED turns on and remains in same state when finger is released This means every time the button is pressed the state of the bu...

Page 16: ...er seen on all CapSense buttons Figure 3 5 Kit with FSS Feature Disabled 3 4 2 Enable FSS Feature Ensure the SW1 switch is in FSS On to enable the FSS feature see Figure 3 6 Touch the power button once to turn off the power and ensure the power LED is turned off Press the power button again to turn on the power This is because the CapSense controller should be reset every time the hardware strappi...

Page 17: ...have seen this behavior in previous sections Figure 3 8 Kit with Toggle and FSS Features Disabled 3 5 2 Enable Both FSS and Toggle Features Ensure the SW1 switch is changed to Both On to enable FSS and Toggle features together see Figure 3 9 Touch the power button once to turn off the power ensure the power LED is turned off Press the power button again to turn on the power This is because the Cap...

Page 18: ...ollowing steps demonstrate the Delay Off feature of CY8CMBR2044 CapSense controller using CY3280 MBR kit Before proceeding power the kit in default mode using the procedure provided in the section 2 5 Power the Kit on page 11 3 6 1 Test CapSense Buttons with Delay Off Feature Disabled Touch a CapSense button the respective LED turns on When the finger is released the LED turns off immediately This...

Page 19: ...are strapping inputs change The Delay Off feature is now enabled Figure 3 12 Delay Potentiometer Turned Extreme Left 3 6 3 Test CapSense Buttons with Delay Off Feature Enabled Touch any CapSense button the respective LED turns on When the finger is released the LED turns off after some delay Play with it the delay depends on the value of the resistor connected to the Delay Off input Keep the poten...

Page 20: ... turns on When the finger is released the LED turns off immediately This is normal operation of the CapSense controller seen on all CapSense buttons Figure 3 14 Kit with Sleep Feature Disabled 3 7 2 Enable Sleep Feature ScanRate Sleep pin of the CapSense controller is connected to a potentiometer This helps to change the value of hardware strapping input connected to the pin This potentiometer is ...

Page 21: ...rent consumed by other circuits such as LEDs The ammeter shows the average power consumed by the CapSense controller As the potentiometer is turned more towards the left the average power continues to reduce Figure 3 16 Setup to Measure Average Current 3 8 ARST Feature The following steps demonstrate the auto reset ARST feature of CY8CMBR2044 CapSense controller using CY3280 MBR kit Before proceed...

Page 22: ...A feature of CY8CMBR2044 CapSense controller using CY3280 MBR kit Before proceeding power the kit in default mode using the procedure provided in 2 5 Power the Kit on page 11 3 9 1 Enable FMEA Feature The FMEA feature is enabled in CY8CMBR2044 CapSense controller by default No change is needed in the kit 3 9 2 Test FMEA Feature CapSense Button Short to Ground Follow these steps 1 Press the power b...

Page 23: ...or J5 This shorts BTN1 and BTN2 sensors 3 Press the power button to turn on the kit FMEA routine is executed by the CapSense controller on power up and the sensor to sensor short is detected On power up observe a pulse of 5 ms width on LED1 and LED2 pins which indicates that BTN1 is shorted to BTN2 CapSense controller disables the button sensors that are shorted to each other Touch BTN1 or BTN2 no...

Page 24: ...24 CY3280 MBR CapSense Express with SmartSense Auto Tuning Kit Guide Doc 001 64772 Rev Kit Features ...

Page 25: ... or B 1 CapSens e But ton 9mm Round 1 BTN1 LED 3 B TN 0 BTN3 BTN2 BTN0 Demo CapSense Controller CY8CMBR2044 BTN 1 C M OD BTN 2 V DD_S W BTN3 1 206 R D4 LE D Red 2 1 LE D0 LE D1 1 206 R D5 LE D Red 2 1 1 206 R D6 LE D Red 2 1 LE D2 1 206 R D7 LE D Red 2 1 CapSense Buttons SLE EP _CNT LE D3 R 13 560 E C4 2200 pFd LEDs J 2 CON N H E ADE R 10P OS 100 R A 15AU 33 33 35 35 37 37 39 39 41 41 34 34 36 36 ...

Page 26: ...T 9 X RES 11 G PO 0 2 TO GG LE FSS 3 GPO 3 14 G PO 1 1 CS0 5 CS3 10 CS1 6 CS2 8 VDD 13 G PO2 16 CMOD 15 DELAY 4 Capsense Based Power Button CY8CMBR2044 P WR_BTN CMO D1 R4 560E C1 2200 pFd P WR_O N_INV VDD_Bat Test Points C6 10 uFd 16v CM OD2 Place CMOD p ad nea r U1 CMO D1 CMOD U2 SN74LV C1G U04 NC 1 A 2 GND 3 VCC 5 Y 4 P WR_O N VIN C9 0 1 uFd VIN R7 ZE RO 1 2 P WR_O N_INV R1 5 1K 1 2 VIN D3 M BR0...

Page 27: ...CY3280 MBR CapSense Express with SmartSense Auto Tuning Kit Guide Doc 001 64772 Rev 27 A 2 Board Layouts A 2 1 PDC 09587 Top ...

Page 28: ...28 CY3280 MBR CapSense Express with SmartSense Auto Tuning Kit Guide Doc 001 64772 Rev A 2 2 PDC 09587 Bottom ...

Page 29: ...Corporation RC0603FR 075K1L 12 1 R20 1 5K RES 1 50K OHM 1 16W 1 0603 SMD Yageo Corporation RC0603FR 071K5L 14 5 R4 R11 R13 R14 R15 560E RES 560 OHM 1 16W 5 0402 SMD Yageo Corporation RC0402JR 07560RL 15 5 R5 R9 R10 R16 R17 330 ohm RES 330 OHM 1 8W 1 0805 SMD Panasonic ECG ERJ 6ENF3300V 16 5 R6 R7 R18 R22 R23 ZERO RES 0 0 OHM 1 10W 5 0805 SMD Panasonic ECG ERJ 6GEY0R00V 17 1 SW1 SP4T SWITCH SLIDE S...

Page 30: ... Some buttons are too sensitive with 2 mm overlay A For a button to successfully work at correct sensitivity with given overlay it is recommended to choose the button size according to the design box If design box recommendation is not followed buttons of bigger size may be oversensitive with thinner overlays Q Touching on the bottom layer of PCB creates false trigger of buttons A Traces connectin...

Page 31: ...ed as finger signal Every time overlay is changed CapSense controller should be reset using XRES or power should be toggled Q Touching the J5 connector creates false triggers on BTN1 and BTN2 A BTN1 and BTN2 are connected to pin 4 and pin 5 of the J5 connector for evaluation of SmartSense Touching the J5 connector increases the capacitance of BTN1 and BTN2 misinterpreted as a button touch In the a...

Page 32: ...32 CY3280 MBR CapSense Express with SmartSense Auto Tuning Kit Guide Doc 001 64772 Rev ...

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