...the world's most energy friendly microcontrollers EFM32GG840 Errata, Chip Rev. E F1024/F512 This document describes errata for the latest revision of EFM32GG840 devices. ...the world's most energy friendly microcontrollers 1 Errata This document contains information on the errata of the latest revision of this device. For errata on older revisions, please refer to the errata history for the device. The device data sheet explains how to identify chip revisions, either from package markings or electronically. In addition to the errata noted below, the errata for the ARM Cortex-M3 r2p1 (www.arm.com) also applies to this device. 1.1 Chip revision E Table 1.1. Erratas ID Title/Problem Effect Fix/Workaround ADC_E116 Offset in ADC Temperature Sensor Calibration DataData For devices with PROD_REV values of 16 or 17, the ADC0_TEMP_0_READ_1V25 register of the Device Information Page has an offset of 112. Using this value for calculating the absolute temperature gives an approximately 18 degrees too high value. Relative temperature measurements (temperature changes) are not affected by this offset. For devices with PROD_REV values of 16 or 17, use ADC0_TEMP_0_READ_1V25 - 112 instead of ADC0_TEMP_0_READ_1V25 when calculating the temperature. For ADC warm-up, the user is required to set the ADC_CTRL_TIMEBASE to the number of ADC clock cycles in 1 µs. As this register is only 5 bits wide, it does not support frequencies above 32 MHz. If an ADC clock above 32 MHz is required, the acquistion time should be increased to also account for too short warmup-time. If BYTEORDER is used in combination with DATASTART or XORSTART, the AES data and key are interpreted in the wrong order. Do not use BYTEORDER in combination with DATASTART or XORSTART. If BYTEORDER is used, it will take one cycle for the AES_STATUS_RUNNING flag to be set. This means that polling this status flag should be postponed at least one cycle after starting encryption/decryption. If polling the AES_STATUS_RUNNING is preferred, insert a No Operation assembly instruction (NOP()) before starting to poll the status flag. Counting error occurs if overflow on 7 LSBs happens when entering LPMODE with LPCOMP=7. This results in the Avoid using LPMODE with LPCOMP=7. The ADC temperature sensor calibration value stored in the Device Information (DI) Page has an offset. ADC_E117 TIMEBASE not wide enough For 48 MHz ADC clock, the ADC_CTRL_TIMEBASE is not wide enough. AES_E101 BYTEORDER does not work in combination with DATASTART/XORSTART When the BYTEORDER bit in AES_CTRL is set, an encryption or decryption should not be started through DATASTART or XORSTART. AES_E102 AES_STATUS_RUNNING set one cycle late with BYTEORDER set When the BYTEORDER bit in AES_CTRL is set, AES_STATUS_RUNNING is set one cycle late. BURTC_E101 BURTC LPMODE entry 2016-04-08 - EFM32GG840FXX - d0095_Rev1.20 2 www.silabs.com ...the world's most energy friendly microcontrollers ID BU_E105 Title/Problem Effect Fix/Workaround Entering LPMODE with LPCOMP=7 causes counter error. counter value being 256 less than it should be after the error. The error accumulates. LFXO missing cycles during IOVDD ramping When IOVDD is ramped, the dc-level of the XTAL signal changes, resulting in missed LFXO cycles and possible glitches on the LFXO clock. Set PRESC in BURTC_CTRL to greater then 0 when ramping IOVDD in combination with Backup mode to avoid glitches on the LFXO clock. LFXO will not work properly with LFXOBUFCUR in CMU_CTRL set. Do not set LFXOBUFCUR in CMU_CTRL. For devices with PROD_REV = 16, LFXO may have startup issues with low capacitance crystals when using the default LFXO configuration. Make this line of code part of your starup code, typically in the start of main(): *((volatile uint32_t*) 0x400c80C0) = (*((volatile uint32_t*) 0x400c80C0) & ~(1<<6)) | (1<<4);. When the device is powered and the DAC is disabled, stress on an internal circuit node can cause the output voltage of the DAC to drift over time, and in some cases may violate the VDACOFFSET specification. If the DAC is always enabled while the device is powered, this condition cannot occur. Both in the startup initialization code and prior to disabling the DAC in application code, set the OPAnSHORT bit in DACn_OPACTRL to a '1' for the corresponding DAC(s) used by the application. This will prevent the output voltage drift over time effect. In EM2, when sleeping with WFE (Wait for Event), an interrupt from the DMA will not wake up the system. Use WFI (Wait for Interrupt) or EM1 instead. LFXO missing cycles during IOVDD ramping when used in combination with Backup mode. CMU_E112 LFXO boost buffer current setting LFXO boost buffer current must be disabled CMU_E113 LFXO startup at high temperature LFXO does not start at high temperature with default configuration. DAC_E109 DAC output drift over lifetime The voltage output of the DAC might drift over time. DMA_E101 EM2 with WFE and DMA WFE does not work for the DMA in EM2. PCNT_E102 PCNT Pulse Width Filtering does not work The PCNT Pulse Width Filter does not work as intended. Do not use the pulse width filter, i.e. ensure FILT = 0 in PCNTn_CTRL. PRS_E101 Edge detect on GPIO/ACMP When using edge detect in PRS on signals from ACMP, GPIO, RTC, LETIMER, LESENSE, VCMP and BURTC edges can be missed. Do not use edge detect on ACMP, GPIO, RTC, LETIMER, LESENSE, VCMP and BURTC. When RSSCOIST is set and PRESC > 0 in TIMERn_CTRL, the capture/compare output value is not reliable. Do not use a prescaled clock, i.e. ensure PRESC = 0 in TIMERn_CTRL when RSSCOIST is enabled. Edge detect on peripherals with asynchronous edges might be missed. TIMER_E103 Capture/compare output is unreliable with RSSCOIST enabled The TIMER capture/compare output is unreliable when RSSCOIST is enabled and the clock is prescaled. 2016-04-08 - EFM32GG840FXX - d0095_Rev1.20 3 www.silabs.com ...the world's most energy friendly microcontrollers ID Title/Problem USART_E112 USART AUTOTX continues to transmit even with full RX buffer Effect Fix/Workaround When AUTOTX in USARTn_CTRL or AUTOTXEN in USARTn_TRIGCTRL is set, the USART will continue to transmit data even after the RX buffer is full. This may cause USART AUTOTX continues to transmit the RX buffer to overflow if the data is not read out in time. even with full RX buffer. No known workaround. 1.2 Older Revisions Erratas for older revisions can be found at the Silicon Laboratories homepage: www.silabs.com/32bit-errata 2016-04-08 - EFM32GG840FXX - d0095_Rev1.20 4 www.silabs.com ...the world's most energy friendly microcontrollers 2 Revision History 2.1 Revision 1.20 April 8th, 2016 Updated the latest revision to revision E. Removed BURTC_E102, BU_E106, CMU_E114, DI_E101, EMU_107, and LES_E103 from revision E. 2.2 Revision 1.10 February 20th, 2015 Added DAC_E109. Added EMU_E107. Added TIMER_E103. Added PCNT_E102. Updated link to errata for older revisions. Corrected typos. Updated Trademark Information. 2.3 Revision 0.80 August 21st, 2013 Added ADC_E117. Added AES_E102. Updated disclaimer, trademark and contact information. 2016-04-08 - EFM32GG840FXX - d0095_Rev1.20 5 www.silabs.com ...the world's most energy friendly microcontrollers 2.4 Revision 0.70 July 30th, 2013 Added AES_E101. Added BURTC_E102. Added CMU_E114. Added DMA_E101. Updated errata naming convention. 2.5 Revision 0.60 June 5th, 2012 Added ADC1. Added DI1. 2.6 Revision 0.50 April 24th, 2012 Added BU6. Added CMU4. Added CMU5. Added LES3. Removed Erratas not valid for chip revision. 2.7 Revision 0.40 January 19th, 2012 2016-04-08 - EFM32GG840FXX - d0095_Rev1.20 6 www.silabs.com ...the world's most energy friendly microcontrollers Updated CUR5. 2.8 Revision 0.30 January 13th, 2012 Added USART1. 2.9 Revision 0.20 January 6th, 2012 Added CMU3. Added CUR3. Added CUR5. Added MSC1. Updated PRS1. Removed Erratas not valid for chip revision. 2.10 Revision 0.10 November 4th, 2011 Initial preliminary release. 2016-04-08 - EFM32GG840FXX - d0095_Rev1.20 7 www.silabs.com ...the world's most energy friendly microcontrollers A Disclaimer and Trademarks A.1 Disclaimer Silicon Laboratories intends to provide customers with the latest, accurate, and in-depth documentation of all peripherals and modules available for system and software implementers using or intending to use the Silicon Laboratories products. Characterization data, available modules and peripherals, memory sizes and memory addresses refer to each specific device, and "Typical" parameters provided can and do vary in different applications. Application examples described herein are for illustrative purposes only. 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Silicon Laboratories products shall under no circumstances be used in weapons of mass destruction including (but not limited to) nuclear, biological or chemical weapons, or missiles capable of delivering such weapons. A.2 Trademark Information Silicon Laboratories Inc., Silicon Laboratories, Silicon Labs, SiLabs and the Silicon Labs logo, CMEMS®, EFM, EFM32, EFR, Energy Micro, Energy Micro logo and combinations thereof, "the world’s most energy friendly microcontrollers", Ember®, EZLink®, EZMac®, EZRadio®, EZRadioPRO®, DSPLL®, ISOmodem®, Precision32®, ProSLIC®, SiPHY®, USBXpress® and others are trademarks or registered trademarks of Silicon Laboratories Inc. ARM, CORTEX, Cortex-M3 and THUMB are trademarks or registered trademarks of ARM Holdings. Keil is a registered trademark of ARM Limited. All other products or brand names mentioned herein are trademarks of their respective holders. 2016-04-08 - EFM32GG840FXX - d0095_Rev1.20 8 www.silabs.com ...the world's most energy friendly microcontrollers B Contact Information Silicon Laboratories Inc. 400 West Cesar Chavez Austin, TX 78701 Please visit the Silicon Labs Technical Support web page: http://www.silabs.com/support/pages/contacttechnicalsupport.aspx and register to submit a technical support request. 2016-04-08 - EFM32GG840FXX - d0095_Rev1.20 9 www.silabs.com ...the world's most energy friendly microcontrollers Table of Contents 1. Errata ....................................................................................................................................................................................................................................... 1.1. Chip revision E ................................................................................................................................................................................................................. 1.2. Older Revisions ................................................................................................................................................................................................................ 2. Revision History .......................................................................................................................................................................................................................... 2.1. Revision 1.20 ................................................................................................................................................................................................................... 2.2. Revision 1.10 ................................................................................................................................................................................................................... 2.3. Revision 0.80 ................................................................................................................................................................................................................... 2.4. Revision 0.70 ................................................................................................................................................................................................................... 2.5. Revision 0.60 ................................................................................................................................................................................................................... 2.6. Revision 0.50 ................................................................................................................................................................................................................... 2.7. Revision 0.40 ................................................................................................................................................................................................................... 2.8. Revision 0.30 ................................................................................................................................................................................................................... 2.9. Revision 0.20 ................................................................................................................................................................................................................... 2.10. Revision 0.10 ................................................................................................................................................................................................................. A. Disclaimer and Trademarks .......................................................................................................................................................................................................... A.1. Disclaimer ....................................................................................................................................................................................................................... A.2. Trademark Information ....................................................................................................................................................................................................... B. Contact Information ..................................................................................................................................................................................................................... B.1. ..................................................................................................................................................................................................................................... 2016-04-08 - EFM32GG840FXX - d0095_Rev1.20 10 www.silabs.com 2 2 4 5 5 5 5 6 6 6 6 7 7 7 8 8 8 9 9 ...the world's most energy friendly microcontrollers List of Tables 1.1. Erratas .................................................................................................................................................................................................................................... 2 2016-04-08 - EFM32GG840FXX - d0095_Rev1.20 11 www.silabs.com