ATA6824-DK Atmel, ATA6824-DK Datasheet - Page 7

• Manufacturer Part Number: ATA6824-DK
• Description: BOARD EVALUATION FOR ATA6824
• Manufacturer: Atmel

Specifications of ATA6824-DK

• Main Purpose: Power Management, Motor Control
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: ATA6824
• Primary Attributes: Brush DC Motors, 5V, Watchdog, Voltage Regulator
• Secondary Attributes: Short-Circuit, Thermal & Undervoltage Protection
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

5.3
Figure 5-3.
4931L–AUTO–02/11
/RESET
Reset and Watchdog Management
WD
t
res
Timing Diagram of the Watchdog Function
t
d
Figure 5-1.
Figure 5-2.
The voltage difference between the regulator output voltage and the upper reset threshold
voltage is bigger than 75mV (VMODE = HIGH) and bigger 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
t
1
4.9V
4.1V
Voltage Dependence and Timing of VCC Controlled RESET
Correlation between VCC Output Voltage and Reset Threshold
VCC
5.15V
4.85V
/RESET
V
VCC
tHRES
t
2
5V
V
CC1-VtHRESH
t
1
WD
T
WD
res
= V
.
.
CC1
- V
V
tHRESH
tHRESH
V
CC1
t
2
T
delayRESL
t
resshort
Atmel ATA6824
Tracking voltage
V
CC1-tHRESH
t
d
OSC
7