ATmega169P Automotive Atmel Corporation, ATmega169P Automotive Datasheet - Page 50

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ATmega169P Automotive

Manufacturer Part Number
ATmega169P Automotive
Description
Manufacturer
Atmel Corporation

Specifications of ATmega169P Automotive

Flash (kbytes)
16 Kbytes
Pin Count
64
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
54
Ext Interrupts
17
Usb Speed
No
Usb Interface
No
Spi
2
Twi (i2c)
1
Uart
1
Segment Lcd
100
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
8
Adc Resolution (bits)
10
Adc Speed (ksps)
15
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
1
Eeprom (bytes)
512
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
Yes
Temp. Range (deg C)
-40 to 85
I/o Supply Class
2.7 to 5.5
Operating Voltage (vcc)
2.7 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
3
Output Compare Channels
4
Input Capture Channels
1
Pwm Channels
4
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
9.2.3
9.2.4
50
ATmega169P Automotive
Brown-out Detection
Watchdog Reset
ATmega169P has an On-chip Brown-out Detection (BOD) circuit for monitoring the V
during operation by comparing it to a fixed trigger level. The trigger level for the BOD can be
selected by the BODLEVEL Fuses. The trigger level has a hysteresis to ensure spike free
Brown-out Detection. The hysteresis on the detection level should be interpreted as V
V
value below the trigger level (V
When V
MCU after the Time-out period t
The BOD circuit will only detect a drop in V
longer than t
Figure 9-5.
When the Watchdog times out, it will generate a short reset pulse of one CK cycle duration. On
the falling edge of this pulse, the delay timer starts counting the Time-out period t
page 51
Figure 9-6.
BOT
+ V
CC
for details on operation of the Watchdog Timer.
HYST
CC
increases above the trigger level (V
BOD
/2 and V
Brown-out Reset During Operation
Watchdog Reset During Operation
INTERNAL
TIME-OUT
given in
RESET
RESET
V
CC
BOT-
”System and Reset Characteristics” on page
= V
BOT
BOT-
TOUT
- V
in
has expired.
HYST
Figure
V
CK
BOT-
/2.When the BOD is enabled, and V
9-5), the Brown-out Reset is immediately activated.
CC
BOT+
if the voltage stays below the trigger level for
in
Figure
V
t
TOUT
9-5), the delay counter starts the
BOT+
328.
CC
decreases to a
TOUT
7735B–AVR–12/07
. Refer to
CC
BOT+
level
=

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