AT90LS4433-4AI datasheet(119/126 Pages) ATMEL

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119

AT90S/LS4433

1042H–AVR–04/03

Errata for

AT90S/LS4433 Rev.

Rev. C/D/E/F

• BOD Keeps the Device in Reset at Low Temperature

• Fuses and Programming Mode

• Incorrect Channel Change in Free Running Mode

• Bandgap Reference Stabilizing Time

• Brown-out Detection Level

• Serial Programming at Voltages below 2.9V

• UART Loses Synchronization if RXD Line is Low when UART Receive is Disabled

BOD Keeps the Device in Reset at Low Temperature

When the device operates at low temperature (below 0

°C) and the BOD is enabled,

tha part may fail to start up. AT low temperature the BOD may never release the

reset, and the part will not start the application. The problem will only occur during

start-up and an already running application wil not go into reset even if the

temperature goes below 0

°C.

Note that this also affects the described workaround for Errata no. 4.

Problem Fix/Workaround

If the device operates at low temperature and a BOD is required, an external BOD

circuit must be used. Alternatively, ATme ga8 can be used inst ead of

AT90S/LS4433.

Fuses and Programming Mode

After programming the Fuses in Serial Programming mode, it is not possible to pro-

gram the Flash or EEPROM. If leaving Programming mode, it is not possible to re-

enter Programming mode.

Problem Fix/Workaround

Power the part down and backup again after programming the Fuses or leaving Pro-

gramming mode.

Incorrect Channel Change in Free Running Mode

If the ADC operates in Free Running mode and channels are changed by writing to

ADMUX, shortly after the ADC Interrupt Flag (ADIF in ADCSR) is set, the new set-

ting in ADMUX may affect the ongoing conversion.

Problem Fix/Workaround

Use Single Conversion mode when scanning channels, or avoid changing ADMUX

util at least 0.5 ADC clock cycles after ADIF goes high.

Bandgap Reference Stabilizing Time

The time for the internal voltage reference for the Analog Comparator to stabilize is

longer than specified. The stabilizing period starts after the bandgap reference has

been selected, and can go on for as much as 10 seconds.

Problem Fix/Workaround

The Bandgap reference will be stable immediately if the internal Brown-out Detector

is enabled.

AT90LS4433-4AI Datasheet(PDF) 119 Page - ATMEL Corporation

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