Cypress Semiconductor CY8CTMA120 Manual

CY8CTST120, CY8CTMG120, CY8CTMA120

September 25, 2008 Document No. 001-49038 Rev. ** 1

September 2008

Silicon Errata for CY8CTST120, CY8CTMG120, and CY8CTMA120

This document describes the errata for the TrueTouch™devices CY8CTST120, CY8CTMA120, and

CY8CTMG120. Details include errata trigger conditions, scope of impact, available workarounds, and silicon

revision applicability. Compare this document to the device’s data sheet for a complete functional description.

Contact your local Cypress Sales Representative if you have questions.

Part Numbers Affected

Part Number

Ordering Information

CY8CTxx120

CY8CTST120-56LFXI

CY8CTST120-56LFXIT

CY8CTST120-00AXI

CY8CTMG120-56LFXI

CY8CTMG120-56LFXIT

CY8CTMG120-00AXI

CY8CTMA120-56LFXI

CY8CTMA120-56LFXIT

CY8CTMA120-00AXI

Errata Summary

The following table defines the errata applicability to available CY8CTxx120 family devices.

Items

Part Number

Silicon Revision

Fix Status

[1]. Internal Main Oscillator

(IMO) tolerance deviation at

temperature extremes

CY8CTxx120

Silicon fix is planned.

[2]. The DP line of the USB

interface may pulse low when

the PSoC device wakes from

sleep, causing an unexpected

wakeup of the host computer

CY8CTxx120

Use workaround.

[3]. Invalid Flash reads may

occur if Vdd is pulled to -0.5V

just before power on

CY8CTxx120

Use workaround.

[4]. PMA Index Register fails

to auto increment with

CPU_Clock set to SysClk/1

(24 MHz)

CY8CTxx120

Use workaround.

[+] Feedback

CY8CTST120, CY8CTMG120, CY8CTMA120

September 25, 2008 Document No. 001-49038 Rev. ** 2

1. Internal Main Oscillator (IMO) tolerance deviation at temperature extremes.

PROBLEM DEFINITION

Asynchronous digital communication interfaces may fail framing beyond 0 to 70°C. This problem does not

affect end product usage between 0 and 70°C.

PARAMETERS AFFECTED

The IMO frequency tolerance. The worst case deviation when operated below 0°C and above +70°C and

within the upper and lower data sheet temperature range is ±5%.

TRIGGER CONDITION

The asynchronous Rx/Tx clock source IMO frequency tolerance may deviate beyond the data sheet limit

of ±4% when operated beyond the temperature range of 0 to +70°C.

SCOPE OF IMPACT

This problem may affect UART, IrDA, and FSK implementations.

WORKAROUND

Implement a quartz crystal stabilized clock source on at least one end of the asynchronous digital

communications interface.

FIX STATUS

The cause of this problem and its solution has been identified. Silicon fix is planned to correct the

deficiency in silicon.

2. The DP line of the USB interface may pulse low when the PSoC® device wakes from sleep causing an

unexpected wakeup of the host computer

PROBLEM DEFINITION

When the device is operating at 4.75V to 5.25V and the 3.3V regulator is enabled, a short low pulse may

be created on the DP signal line during device wakeup. The 15 µs to 20 µs low pulse of the DP line may

be interpreted by the host computer as a de-attach or the beginning of a wakeup.

PARAMETERS AFFECTED

The bandgap reference voltage used by the 3.3V regulator decreases during sleep due to leakage. Upon

device wakeup, the bandgap is re-enabled and after a delay for settling, the 3.3V regulator is enabled. On

some devices the 3.3V regulator that is used to generate the USB DP signal may be enabled before the

bandgap is fully stabilized. This can cause a low pulse on the regulator output and DP signal line until the

bandgap stabilizes. In applications where Vdd is 3.3V, the regulator is not used; therefore, the DP low

pulse is not generated.

WORKAROUND

To prevent the DP signal from pulsing low, keep the bandgap enabled during sleep. The most efficient

method is to set the No Buzz bit in the OSC_CR0 register. The No Buzz bit keeps the bandgap powered

and output stable during sleep. Setting the No Buzz bit results in a nominal 100 µA increase to sleep

current. Leaving the analog reference block enabled during sleep also resolves this issue because it

forces the bandgap to remain enabled. An example to disable the No Buzz bit is as follows.

Assembly

M8C_SetBank1

or reg[OSC_CR0], 0x20

M8C_SetBank0

OSC_CR0 |= 0x20;

[+] Feedback

CY8CTST120, CY8CTMG120, CY8CTMA120

September 25, 2008 Document No. 001-49038 Rev. ** 3

3. Invalid Flash reads may occur if Vdd is pulled to -0.5V just before power on.

PROBLEM DEFINITION

When Vdd of the device is pulled below ground just before power on, the first read from each 8K Flash

page may be corrupted. This issue does not affect Flash page 0 because it is the selected page upon

reset.

PARAMETERS AFFECTED

When Vdd is pulled below ground before power on, an internal Flash reference may deviate from its

nominal voltage. The reference deviation tends to result in the first Flash read from that page returning

0xFF. During the first read from each page, the reference is reset. This results in all future reads returning

the correct value. A short delay of 5 µs before the first real read provides time for the reference voltage to

stabilize.

WORKAROUND

To prevent an invalid Flash read, a dummy read from each Flash page must occur before use of the

pages. A delay of 5 µs must occur after the dummy read and before a real read. The dummy reads

occurs as soon as possible and must be located in Flash page 0 before a read from any other Flash

page. An example to read a byte of memory from each Flash page follows. Place it in boot.tpl and

boot.asm immediately after the ‘start:’ label.

// dummy read from each 8K Flash page

// page 1

mov A, 0x20 // MSB

mov X, 0x00 // LSB

romx

// wait at least 5 µs

mov X, 14

loop1:

dec X

jnz loop1

4. PMA Index Register fails to auto increment with CPU_Clock set to SysClk/1 (24 MHz).

PROBLEM DEFINITION

When the device is operating at 4.75 to 5.25V and the CPU_Clock is set to SysClk/1 (24 MHz), the USB

PMA Index Register may fail to increment automatically when used in an OUT endpoint configuration at

full speed. When the application program attempts to use the bReadOutEP() function, the first byte in the

PMA buffer is always returned.

PARAMETERS AFFECTED

An internal flip-flop hold problem associated with Index Register increment function. All reads of the

associated RAM originate from the first byte. The hold problem has no impact on other circuits or

functions within the device.

WORKAROUND

To make certain that the index register properly increments, set the CPU_Clock to SysClk/2 (12 MHz)

during the read of the PMA buffer. An example for the clock adjustment method is listed below.

PSoC Designer™4.3 User Module Workaround: PSoC Designer Release 4.3 and subsequent

releases includes a revised full speed USB User Module, which includes the revised firmware as shown in

the following example.

;;

;; 24Mhz read PMA workaround

;;

M8C_SetBank1

mov A, reg[OSC_CR0]

push A

[+] Feedback

CY8CTST120, CY8CTMG120, CY8CTMA120

September 25, 2008 Document No. 001-49038 Rev. ** 4

and A, 0xf8 ;clear the clock bits (briefly chg the cpu_clk to 3Mhz)

or A, 0x02 ;will set clk to 12Mhz

mov reg[OSC_CR0],A ;clk is now set at 12Mhz

M8C_SetBank0

.loop:

mov A, reg[PMA0_DR] ; Get the data from the PMA space

mov [X], A ; save it in data array

inc X ; increment the pointer

dec [USB_APITemp+1] ; decrement the counter

jnz .loop ; wait for count to zero out

;;

;; 24Mhz read PMA workaround (back to previous clock speed)

;;

pop A ;recover previous reg[OSC_CR0] value

M8C_SetBank1

mov reg[OSC_CR0],A ;clk is now set at previous value

M8C_SetBank0

;; end 24Mhz read PMA workaround

References

[1] Document # 001-46932 CY8CTST120 TrueTouch™Single-Touch Touchscreen Controller (Final)

[2] Document # 001-46929 CY8CTMG120 TrueTouch™Multi-Touch Gesture Touchscreen Controller (Final)

[3] Document # 001-46901 CY8CTMA120 TrueTouch™Multi-Touch All-Point Touchscreen Controller (Final)

[+] Feedback

CY8CTST120, CY8CTMG120, CY8CTMA120

September 25, 2008 Document No. 001-49038 Rev. ** 5

Document History

Document Title: Silicon Errata for CY8CTST120, CY8CTMG120, and CY8CTMA120

Document Number: 001-49038

Revision

ECN

Submission

Date

Orig. of

Change

Description of Change

2572224

09/25/08

KRY

New errata for Touchscreen device.

PSoC is a registered trademark of Cypress Semiconductor Corp. TrueTouch, Programmable System-on-Chip, PSoC Designer, and PSoC Express are

trademarks of Cypress Semiconductor Corp. All other trademarks or registered trademarks referenced herein are the property of their respective

owners.

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