ATA6613 ATMEL Corporation, ATA6613 Datasheet - Page 17

• Manufacturer Part Number: ATA6613
• Description: Ata6613
• Manufacturer: ATMEL Corporation

3.3.24
9111C–AUTO–02/08
Watchdog
Figure 3-7.
For programming purposes of the microcontroller it is potentially neccessary to supply the V
output via an external power supply while the V
This behavior is no problem for the system basis chip.
The watchdog anticipates a trigger signal from the microcontroller at the NTRIG (negative edge)
input within a time window of T
t
NRES. After a watchdog reset the IC starts with the lead time. The timing basis of the watchdog
is provided by the internal oscillator. Its time period, T
R
During Silent or Sleep Mode the watchdog is switched off to reduce current consumption.
The minimum time for the first watchdog pulse is required after the undervoltage reset at NRES
disappears. It is defined as lead time t
t
trigmin
d
wd_osc
starts with the negative edge of the RXD output.
> 200 ns. If a triggering signal is not received, a reset signal will be generated at output
(34 k to 120 k ).
5.5V/3.8V
5V/3.3V
5V/3.3V
NRES
V
VCC Voltage Regulator: Ramp Up and Undervoltage Detection
12V
VS
thun
T
VCC
w d
d
T
. The trigger signal must exceed a minimum time
. After wake up from Sleep or Silent Mode, the lead time
Reset
S
Pin of the system basis chip is disconnected.
osc
, is adjustable via the external resistor
ATA6612/ATA6613
T
res_f
t
t
t
17
CC