Rainbow Electronics ATA6624 - Manual (Page 14)

14
4986F–AUTO–07/08
ATA6622/ATA6624/ATA6626
Figure 5-1. VCC Voltage Regulator: Ramp-up and Undervoltage Detection
Figure 5-2. Power Dissipation: Safe Operating Area versus VCC Output Current and Supply
Voltage V
S
at Different Ambient Temperatures Due to R
thja
= 35 K/W
For programming purposes of the microcontroller it is potentially necessary to supply the V
CC
output via an external power supply while the V
S
Pin of the system basis chip is disconnected.
This behavior is no problem for the system basis chip.
NRES
5V/3.3V
t
t
t
VS
5V/3.3V
V
thun
T
res_f
T
Reset
T
VCC
5.5V/3.8V
12V
0
10
2 0
3 0
4 0
50
6 0
3 5 7 9 11 13 15 17 19
V
S
/V
I VCC
/mA
T
amb
= 125˚C
T
amb
= 105˚C