Errata for the CY3218-CAPEXP2 CapSense Express Kit.pdf

CY3218-CAPEXP2
August 6, 2012
Errata for the CY3218-CAPEXP2 CapSense Express™ Kit
This document describes the errata for the CY3218-CAPEXP2 kit. Details include errata trigger conditions, scope
of impact, available workarounds, and the kit revision applicability.
Contact your local Cypress Sales Representative if you have questions.
Part Numbers Affected
Part Number
Kit Revision Number
CY3218-CAPEXP2
121R-45900 R**
CY3218-CAPEXP2 Kit Status
Full Release
CY3218-CAPEXP2 Errata Summary
The following table defines the errata applicability to the CY3218-CAPEXP2.
Items
Applicability
Fix Status
1. Mechanical button and resistive pull up
drive mode.
All projects created on CAPEXP2
Fixed in this release of
CAPEXP2 kit
2. Mechanical button configured as sleep
control pin
All projects created on CAPEXP2
using sleep
Fixed in this release of
CAPEXP2 kit
1. Mechanical button and resistive pull up drive mode
 PROBLEM DEFINITION
If the drive mode of GPIO connected to mechanical button is set to resistive pull up, the button does
not function. The button is expected to provide logic 0 during inactive state (not pressed) and logic 1
during active state (pressed). In the original design, in both states button provides a logic 1 input.
 PROJECTS AFFECTED
All projects using mechanical button in combination with resistive pull up drive mode
 TRIGGER CONDITION
When GPIO input is configured with resistive pull up drive mode
 SCOPE OF IMPACT
Cannot use mechanical button in resistive pull up mode for regular inputs
 WORKAROUND
Kit circuit is modified with manual re-work to provide logic 1 during inactive state of button in both
resistive pull up and open drain drive mode and logic 0 during active state of the mechanical button.
Figure 2 illustrates the workaround.
Cypress Semiconductor Corporation
August 6, 2012
198 Champion Court
San Jose, CA 95134
Document No. 001-54659 Rev. *A
408.943.2600
1
Errata Document
CY3218-CAPEXP1
Figure 1. Initial Design
VCC_3V3
R33
10K
S1
Mech_Button
2
4
To Capsense Express
R41
100K 1%
1
3
Dome Switch
Mechanical Button
Figure 2. Workaround
VCC_3V3
R41
20K
S2
Mech_Button
To Capsense Express
2
4
1
3
Dome Switch
Mechanical Button

FIX STATUS
The error is fixed in the 121R-45900 R** release of the CY3218-CAPEXP2 kit.
2. Mechanical button configured as sleep control pin
 PROBLEM DEFINITION
For GPIO input to be used as sleep control pin, it should provide logic 1 for the device to sleep and
logic 0 for the device to wake up from sleep. In the original design, mechanical button with GPIO in
resistive pull up drive mode provides logic 1 in both states. As a result, the mechanical button in the
original CY3218-CAPEXP2 board cannot be used for sleep control.
 PARAMETERS AFFECTED
All projects using mechanical button on the CAPEXP2 kit for sleep control input
 TRIGGER CONDITION
When GPIO input is configured as sleep control input
 SCOPE OF IMPACT
Cannot use the mechanical button input for sleep control input
 WORKAROUND
Kit circuit is modified with manual rework to provide logic 1 during inactive state of button in both
resistive pull up and open drain drive mode and logic 0 during active state of the mechanical button.
Figure 2 illustrates the workaround.
 FIX STATUS
The error is fixed in the 121R-45900 R** release of the CY3218-CAPEXP2 kit.
August 6, 2012
Document No. 001-54659 Rev. *A
2
Errata Document
CY3218-CAPEXP1
Document History
Document Title: Errata for the CY3218-CAPEXP2 CapSense Express™ Kit
Document Number: 001-54659
Rev.
ECN No.
Orig. of
Change
**
2743025
RKPM
New errata for the CY3218-CAPEXP2 kit
*A
3704257
SLAN
No technical updates.
Description of Change
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Phone: 408-943-2600
Fax: 408-943-4730
http://www.cypress.com
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August 6, 2012
Document No. 001-54659 Rev. *A
3
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