ATA6622C_14 Datasheet, PDF (13/29 Pages) ATMEL Corporation – Master and slave operation possible

● If TXD is short-circuited to GND, it is possible to switch to Sleep Mode via ENABLE after t_dom > 20ms (only for Atmel^®
ATA6622C/ATA6624C).
● If the WD_OSC pin has a short-circuit to GND and the NTRIG Signal has a period time > 27ms, the watchdog runs
with an internal oscillator and guarantees a reset after the second NTRIG signal at the latest.
● If the resistor at WO_OSC pin is disconnected, the watchdog runs with an internal oscillator and guarantees a reseet
after the second NTRIG signal at the latest.
5.6 Voltage Regulator
The voltage regulator needs an external capacitor for compensation and for smoothing the disturbances from the
microcontroller. It is recommended to use an electrolythic capacitor with C > 1.8µF and a ceramic capacitor with C = 100nF.
The values of these capacitors can be varied by the customer, depending on the application.
The main power dissipation of the IC is created from the VCC output current I_VCC, which is needed for the application. In
Figure 5-2 on page 13 the safe operating area of the Atmel ATA6624C/ATA6626C is shown.
Figure 5-1. VCC Voltage Regulator: Ramp-up and Undervoltage Detection
VS
12V
5.5V/3.8V
VCC
5V/3.3V
V_thun
NRES
5V/3.3V
T_VCC
T_Reset
t
T_{res_f} ^t
t
Figure 5-2.
Power Dissipation: Safe Operating Area: VCC Output Current versus Supply Voltage V_S at Different
Ambient Temperatures Due to R_thja = 35K/W
90
80
T_amb = 105°C
70
60
T_amb = 115°C
50
40
T_amb = 125°C
30
20
10
0
5 6 7 8 9 10 11 12 13 14 15 16 17 18
V_S (V)
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 will not affect the system basis chip.
ATA6622C/ATA6624C/ATA6626C [DATASHEET]
13
4986O–AUTO–10/14