ATmega406 Atmel Corporation, ATmega406 Datasheet - Page 42
ATmega406
Manufacturer Part Number
ATmega406
Description
Manufacturer
Atmel Corporation
Specifications of ATmega406
Flash (kbytes)
40 Kbytes
Pin Count
48
Max. Operating Frequency
1 MHz
Cpu
8-bit AVR
# Of Touch Channels
8
Hardware Qtouch Acquisition
No
Max I/o Pins
18
Ext Interrupts
4
Usb Speed
No
Usb Interface
No
Twi (i2c)
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
11
Adc Resolution (bits)
12
Adc Speed (ksps)
1.9
Resistive Touch Screen
No
Temp. Sensor
Yes
Crypto Engine
No
Sram (kbytes)
2
Eeprom (bytes)
512
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-30 to 85
I/o Supply Class
4.0 to 25
Operating Voltage (vcc)
4.0 to 25
Fpu
No
Mpu / Mmu
no / no
Timers
2
Output Compare Channels
3
Pwm Channels
2
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ATmega406-1AAU
Manufacturer:
AT
Quantity:
20 000
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9.2.3
9.2.4
42
ATmega406
Watchdog Reset
Brown-out Detection
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 43
Figure 9-4.
ATmega406 has an On-chip Brown-out Detection (BOD) circuit for monitoring the VREG level
during operation by comparing it to a fixed trigger level V
teresis to ensure spike free Brown-out Detection. The hysteresis on the detection level should
be interpreted as V
The BOD is automatically enabled in all modes of operation, except in Power-off mode.
When the BOD is enabled, and VREG decreases to a value below the trigger level (V
ure
level (V
expired.
Figure 9-5.
9-5), the Brown-out Reset is immediately activated. When V
BOT+
INTERNAL
for details on operation of the Watchdog Timer.
TIME-OUT
RESET
RESET
VREG
in
FET
Watchdog Reset During Operation
Brown-out Reset During Operation
Figure
BOT+
9-5), the delay counter starts the MCU after the Time-out period t
= V
BOT
+ V
HYST
V
BOT-
/2 and V
CK
BOT-
= V
BOT
BOT
- V
= 2.7V. The trigger level has a hys-
HYST
V
t
CC
TOUT
BOT+
/2.
increases above the trigger
TOUT
2548E–AVR–07/06
BOT-
. Refer to
TOUT
in
Fig-
has
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