cy8c3446lti-075es2 Cypress Semiconductor Corporation., cy8c3446lti-075es2 Datasheet - Page 11

• Manufacturer Part Number: cy8c3446lti-075es2
• Description: Psoc? 3 Cy8c34 Family Errata Silicon Revision Es2
• Manufacturer: Cypress Semiconductor Corporation.

11. MHz Oscillator Startup
12. MHz External Crystal Oscillator Voltage
January 7, 2011
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PROBLEM DEFINITION
The MHz oscillator has reduced average gain; this results in startup failures in some devices with gain on the
lower end of the distribution. This applies only when prototyping. MHz oscillator is not to be used in production.
TRIGGER CONDITION(S)
Starting the external MHz crystal.
SCOPE OF IMPACT
The oscillator is unable to start the external crystal. Additionally, the XERR bit in the MHz ECO register
XMHZ_CSR[7] does not report error conditions correctly. If an error occurs the XERR bit will not reflect the
error condition.
WORKAROUND
Two workarounds are available for startup issues. These workarounds apply only when prototyping.
MHz oscillator is not to be used in production.
1. Use a low ESR crystal in design. This is not guaranteed to correct startup issues in all cases
2. Contact Cypress to request replacement samples
FIX STATUS
Silicon revision fix confirmed in production silicon.
PROBLEM DEFINITION
The MHz External Crystal Oscillator (
Vdda is below 2.0 V.
PARAMETERS AFFECTED
NA
TRIGGER CONDITION(S)
Vdda < 2.0 V with External Crystal Oscillator enable.
SCOPE OF IMPACT
This issue results in the MHz oscillator only functioning for Vdda > 2.0.
WORKAROUND
1. If possible run the device at Vdda 2.0 V
2. If MHz crystal accuracy is required with Vdda below 2.0 V an external crystal and oscillator can be used
3. Use the IMO (and PLL if required) with 1% accuracy
FIX STATUS
Silicon revision fix confirmed in production silicon.
a) Directly increase the Vdda supply to  2.0 V
b) Use the Inductive Boost Pump to increase the Vdda supply to  2.0 V
to route a digital clock into the device through the Digital Clock Source in PSoC Creator
Document Number: 001-61136 Rev. *C
Errata Document
MHz ECO)
used to drive an external MHz crystal does not function when
PSoC
®
3: CY8C34 Family
11
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