cy8c3446lti-075es2 Cypress Semiconductor Corporation., cy8c3446lti-075es2 Datasheet - Page 10

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

10. MHz Oscillator Reliability
January 7, 2011
8. Delta Sigma ADC Gain
9. Delta Sigma ADC Routing
■
■
■
■
■
■
■
■
■
■
■
■
■
■
■
■
PROBLEM DEFINITION
Gain compensation trim values are not provided in the silicon. This results in gain errors when using the Delta
Sigma ADC and a reduction in usable range.
TRIGGER CONDITION(S)
Using the Delta Sigma ADC.
SCOPE OF IMPACT
Gain errors of less than 1% are typically found. However, gain errors up to 2% are possible.
WORKAROUND
Manually calibrate the ADC using the ADC_SetGain() API provided in the DeltaSigma ADC component
datasheet. A known external reference voltage is required to be provided in order to perform this calibration.
FIX STATUS
Silicon revision fix confirmed in ES2 with date code 1042 or later in conjunction with PSoC Creator Beta 5
release.
PROBLEM DEFINITION
The positive input mux to the Delta Sigma ADC does not include a connection to the AMUX Bus. The negative
input mux incorrectly connects to the AMUX Bus. See the PSoC 3: CY8C34 Family Technical Reference
Manual for details.
PARAMETERS AFFECTED
NA
TRIGGER CONDITION(S)
NA
SCOPE OF IMPACT
The Delta Sigma ADC cannot be directly connected to the AMUX Bus for single-ended ADC conversions.
WORKAROUND
The positive input mux of the Delta Sigma ADC may be connected to a Global Mux Bus, which in turn may
connect to the AMUX Bus through one of the other analog resource’s input muxes. The use of another analog
resource’s mux for this routing connection may limit the use of that resource. PSoC
automatically works around this errata if hardware resources allow.
FIX STATUS
Silicon revision fix confirmed in production silicon.
PROBLEM DEFINITION
The MHz oscillator contains a design weakness that causes it to function outside datasheet specifications if
Vdda is greater than 1.8 V. This weakness is not immediately present on new devices. The issue manifests
over a period of time ranging from a few months to several years. The exact time to failure varies from device
to device. This applies only when prototyping. MHz oscillator is not to be used in production.
TRIGGER CONDITION(S)
Vdda greater then 1.8 V when the ECO MHz oscillator is enabled.
SCOPE OF IMPACT
The MHz oscillator failure mode ranges from increased current in low power modes of approximately 10 µA,
up through complete non functionality of the ECO MHz oscillator. The exact failure mode varies from device
to device.
WORKAROUND
None. MHz oscillator not to be used in production.
FIX STATUS
Silicon revision fix confirmed in production silicon.
Document Number: 001-61136 Rev. *C
Errata Document
PSoC
®
3: CY8C34 Family
®
Creator™ software
10
[+] Feedback