ATA6823-DK Atmel, ATA6823-DK Datasheet - Page 8

• Manufacturer Part Number: ATA6823-DK
• Description: BOARD EVALUATION FOR ATA6823
• Manufacturer: Atmel
• Type: PWM Controllersr

Specifications of ATA6823-DK

• Main Purpose: Power Management, Motor Control
• Embedded: No
• Utilized Ic / Part: ATA6823
• Primary Attributes: Brush DC Motors, 8 ~ 18V, LIN Interface, Watchdog, 5V Regulator
• Secondary Attributes: Cross Conduction, Under/Over Voltage, Short Circuit, & Temperature Protection
• Input Voltage: 8 V to 18 V
• Product: Power Management Modules
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: ATA6823

3.5
Figure 3-3.
8
/RESET
Reset and Watchdog Management
Atmel ATA6823
WD
t
res
Timing Diagram of the Watchdog Function
t
d
Please note that this regulator is the main heat source on the chip. The maximum output cur-
rent at maximum battery voltage and high ambient temperature can only guaranteed if the IC
is mounted on an efficient heat sink.
A power-good comparator checks the output voltage of the VCC regulator and keeps the
external microcontroller in reset as long as the voltage is too low.
Figure 3-2.
The voltage difference between the regulated output voltage and the upper reset threshold
voltage is higher than 75mV (VMODE = HIGH) and higher than 50mV (VMODE = LOW).
The timing basis of the watchdog is provided by the trimmed internal oscillator. Its period T
is adjustable via the external resistor R
The watchdog expects a triggering signal (a rising edge) from the microcontroller at the WD
input within a period time window of T
is switched off during Sleep mode.
t
1
Correlation between VCC Output Voltage and Reset Threshold
4.9V
4.1V
t
2
5.15V
4.85V
t
1
V
WD
CC1-VtHRESH
WD
. In order to save current consumption, the watchdog
.
= V
CC1
V
t
2
tHRESH
V
- V
CC1
tHRESH
t
resshort
t
d
4856K–AUTO–01/11
OSC