ATA6616-P3QW Atmel, ATA6616-P3QW Datasheet - Page 247

• Manufacturer Part Number: ATA6616-P3QW
• Description: TXRX MULTICHIP MOD LIN SIP 38QFN
• Manufacturer: Atmel
• Series: AVR® ATA66 LIN-SBCr

Specifications of ATA6616-P3QW

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: I²C, LIN, SPI, UART/USART, USI
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 16
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 11x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 38-VQFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

4.21.2.5
4.21.2.6
9132D–AUTO–12/10
Preventing Flash Corruption
Programming Time for Flash when Using SPM
During periods of low Vcc, the Flash program can be corrupted because the supply voltage is
too low for the CPU and the Flash to operate properly. These issues are the same as for board
level systems using the Flash, and the same design solutions should be applied.
A Flash program corruption can be caused by two situations when the voltage is too low.
Flash corruption can easily be avoided by following these design recommendations (one is
sufficient):
The calibrated RC Oscillator is used to time Flash accesses.
gramming time for Flash accesses from the CPU.
Table 4-66.
• First, a regular write sequence to the Flash requires a minimum voltage to operate
• Secondly, the CPU itself can execute instructions incorrectly, if the supply voltage for
1. Keep the AVR
2. Keep the AVR core in Power-down sleep mode during periods of low Vcc. This will
Flash write (Page Erase, Page Write,
correctly.
executing instructions is too low.
age. This can be done by enabling the internal Brown-out Detector (BOD) if the
operating voltage matches the detection level. If not, an external low Vcc reset pro-
tection circuit can be used. If a reset occurs while a write operation is in progress, the
write operation will be completed provided that the power supply voltage is sufficient.
prevent the CPU from attempting to decode and execute instructions, effectively pro-
tecting the SPMCSR Register and thus the Flash from unintentional writes.
and write Lock bits by SPM)
SPM Programming Time
Symbol
®
RESET active (low) during periods of insufficient power supply volt-
Min Programming Time
Atmel ATA6616/ATA6617
3.7ms
Table 4-66
Max Programming Time
shows the typical pro-
4.5ms
247