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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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ATXMEGA128A1-AU Datenblatt(PDF) 87 Page - ATMEL Corporation |
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ATXMEGA128A1-AU Datenblatt(HTML) 87 Page - ATMEL Corporation |
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87 / 99 page  87 8067I–AVR–04/09 XMEGA A1 Problem fix/Workaround If internal voltages must be measured when V CC is below 2.7V, measure the internal 1.00V reference instead of the bandgap. 16. DAC refresh may be blocked in S/H mode If the DAC is running in Sample and Hold (S/H) mode and conversion for one channel is done at maximum rate (i.e. the DAC is always busy doing conversion for this channel), this will block refresh signals to the second channel. Problem fix/Workarund When using the DAC in S/H mode, ensure that none of the channels is running at maximum conversion rate, or ensure that the conversion rate of both channels is high enough to not require refresh. 35.2 ATxmega128A1 rev. G • Bootloader Section in Flash is non-functional • Bandgap voltage input for the ACs cannot be changed when used for both ACs simultaneously • DAC is nonlinear and inaccurate when reference is above 2.4V • ADC gain stage output range is limited to 2.4 V • The ADC has up to ±2 LSB inaccuracy • TWI, a general address call will match independent of the R/W-bit value • TWI, the minimum I2C SCL low time could be violated in Master Read mode • Setting HIRES PR bit makes PWM output unavailable • EEPROM erase and write does not work with all System Clock sources • BOD will be enabled after any reset • Propagation delay analog Comparator increasing to 2 ms at -40°C • Sampled BOD in Active mode will cause noise when bandgap is used as reference • Default setting for SDRAM refresh period too low • Flash Power Reduction Mode can not be enabled when entering sleep mode • Enabling Analog Comparator B output will cause JTAG failure • JTAG enable does not override Analog Comparator B output • Bandgap measurement with the ADC is non-functional when V CC is below 2.7V • DAC refresh may be blocked in S/H mode 1. Bootloader Section in Flash is non-functional The Bootloader Section is non-functional, and bootloader or application code cannot reside in this part of the Flash. Problem fix/Workaround None, do not use the Bootloader Section. 2. Bandgap voltage input for the ACs cannot be changed when used for both ACs simultaneously If the Bandgap voltage is selected as input for one Analog Comparator (AC) and then selected/deselected as input for the another AC, the first comparator will be affected for up to 1 us and could potentially give a wrong comparison result. Problem fix/Workaround If the Bandgap is required for both ACs simultaneously, configure the input selection for both ACs before enabling any of them. |
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