Figure 3-7. VCC Voltage Regulator: Ramp-up and Undervoltage Detection
VS
12V
5.5V
VCC
5V
Vthun
NRES
5V
tVCC
tReset
t
tres_f
t
t
Figure 3-8.
Power Dissipation: Safe Operating Area VCC Output Current versus Supply
Voltage VS at Different Ambient Temperatures
90
80
70
Tamb = 100°C
60
Tamb = 105°C
50
40
Tamb = 110°C
30
Tamb = 115°C
20
10
0
4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
VS/V
For programming purposes of the microcontroller it is potentially necessary to supply the VCC
output via an external power supply while the VS Pin of the system basis chip is disconnected.
This will not affect the system basis chip.
16 Atmel ATA6616/ATA6617
9132F–AUTO–02/12