ATA6616-P3PW Atmel, ATA6616-P3PW Datasheet - Page 18

• Manufacturer Part Number: ATA6616-P3PW
• Description: TXRX MULTICHIP MOD LIN SIP 38QFN
• Manufacturer: Atmel
• Series: AVR® ATA66 LIN-SBCr

Specifications of ATA6616-P3PW

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: I²C, LIN, SPI, UART/USART, USI
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 16
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 11x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 38-VQFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 3-9.
3.6.2
18
NTRIG
Atmel ATA6616/ATA6617
NRES
Worst Case Calculation with R
VCC
Timing Sequence with R
Undervoltage Reset
t
reset
= 4ms
The internal oscillator has a tolerance of 20%. This means that t
worst case calculation for the watchdog period t
The ideal watchdog time t
t
t
t
t
t
t
A microcontroller with an oscillator tolerance of ±15% is sufficient to correctly supply the trig-
ger inputs.
Table 3-2.
2
1,min
2,min
wdmax
wdmin
wd
.
R
WD_OSC
= 29.3ms ±4.5ms (±15%)
120
k
34
51
91
= 0.8
= 0.8
= t
= t
1max
1min
WD_OSC
Oscillator
+ t
= 24.8ms
t
t
1
2
Period
t
WD_OSC
Typical Watchdog Timings
19.61
33.54
42.84
osc
= 16.5ms, t
= 17.3ms, t
13.3
2min
t
d
/µs
= 155ms
= 51k
= 16.5ms + 17.3ms = 33.8ms
t
trig
= 51 k
> 200ns
t
1
264.80
338.22
t
154.8
Lead
Time
wd
d
= 20.6ms
105
1,max
2,max
/ms
is between the maximum t
= 1.2
= 1.2
Window
Closed
t
wd
t
20.64
35.32
45.11
14.0
1
/ms
t
2
t
t
1
2
= 21ms
= 24.8ms
= 26ms
Open Window
wd
21.67
37.06
47.34
t
is calculated below.
14.7
2
t
/ms
1
1
and the minimum t
Trigger Period from
1
t
Microcontroller
2
and t
t
29.32
50.14
64.05
wd
Watchdog Reset
19.9
2
/ms
can vary by 20%. The
t
nres
1
= 4ms
plus the minimum
9132D–AUTO–12/10
t
nres
Reset
Time
4
4
4
4
/ms