INTEGRATED CIRCUITS ERRATA SHEET Date: Document Release: Device Affected: 2009 Apr 9 Version 4.0 LPC2927 This errata sheet describes both the known functional problems and any deviations from the electrical specifications known at the release date of this document. Each deviation is assigned a number and its history is tracked in a table at the end of the document. 2009 Apr 9 NXP Semiconductors NXP Semiconductors LPC2927 Erratasheet Document revision history Rev Date Description 4.0 2009 April 9 Corrected revision identifier for EEPROM.1 3.0 2009 April 1 Added EEPROM.1 2.0 2009 February 12 Updated ADC0.1 and ESD.1 1.0 2009 January 15 First version 2009 Apr 9 2 NXP Semiconductors LPC2927 Erratasheet Identification The typical LPC2927 devices have the following top-side marking: LPC2927xxx xxxxxxx xxxYYWWR The last letter in the third line (field ‘R’) will identify the device revision. This Errata Sheet covers the following revisions of the LPC2927: Revision Identifier (R) ‘0’ ‘(blank)’ Comment Second device revision Initial device revision Field ‘YY’ states the year the device was manufactured. Field ‘WW’ states the week the device was manufactured during that year. 2009 Apr 9 3 NXP Semiconductors LPC2927 Erratasheet Errata Overview - Functional Problems Functional Problem Short Description Device Revision the problem occurs in EEPROM.1 The LPC2927 EEPROM was not trimmed at ESORT. (blank), 0 ADC0.1 Missing Codes (blank) Errata Overview - AC/DC Deviations AC/DC Deviation ESD.1 Short Description The LPC2927 does not meet the NXP QRS ESD requirements on the Vddosc pin. The Vddosc pin fails ESD HBM at 500 V. Device Revision the deviation occurs in (blank) Errata Notes Notes N/A 2009 Apr 9 Short Description N/A Device Revision the note applies to N/A 4 NXP Semiconductors LPC2927 Erratasheet Functional problems EEPROM.1 The LPC2927 EEPROM was not trimmed at ESORT. Introduction: Program, erase, and readback of data from the EEPROM is not reliable at the specified 375 kHz speed. Problem: Devices with date codes on or before 0909 exhibit this issue (actual package marking ZSG09090). For products with newer date codes the EEPROM are correctly trimmed. Work around: Use devices with date codes after 0909. ADC0.1 Missing Codes Introduction: The LPC2927 has a 10-bit ADC with a 5.0 V measurement range providing a total of up to 24 analog inputs with conversion times as low as 2.44 µs per channel (FADC = 4.5 MHz). Each channel provides a compare function to minimize interrupts. Problem: On devices with date codes before 0905 and for FADC > 2.5 MHz, the 5 V ADC shows missing codes. Work around: Limit the FADCmax for ADC0 to 2.0 MHz. AC/DC Deviations ESD.1 The LPC2927 does not meet the NXP QRS ESD requirements on the Vddosc pin. Introduction: The LPC2927 is rated for 2 kV ESD HBM. The Vddosc pin is the power supply pin for the oscillator circuit. Problem: On devices with date codes before 0905, the LPC2927 does not meet the required 2 kV ESD HBM specification. Work around: Observe proper ESD handling precautions for the LPC2927. 2009 Apr 9 5