ATmega169P Automotive Atmel Corporation, ATmega169P Automotive Datasheet - Page 50

• Manufacturer Part Number: ATmega169P Automotive
• 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
=