ATmega48 Automotive Atmel Corporation, ATmega48 Automotive Datasheet - Page 43
![no-image](/images/manufacturer_photos/0/0/79/atmel_corporation_sml.jpg)
ATmega48 Automotive
Manufacturer Part Number
ATmega48 Automotive
Description
Manufacturer
Atmel Corporation
Specifications of ATmega48 Automotive
Flash (kbytes)
4 Kbytes
Pin Count
32
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
# Of Touch Channels
12
Hardware Qtouch Acquisition
No
Max I/o Pins
23
Ext Interrupts
24
Usb Speed
No
Usb Interface
No
Spi
2
Twi (i2c)
1
Uart
1
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)
0.5
Eeprom (bytes)
256
Self Program Memory
NO
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 125
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
6
Input Capture Channels
1
Pwm Channels
6
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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9.5
9.6
7701E–AVR–02/11
Brown-out Detection
Watchdog Reset
Figure 9-4.
ATtiny24/44/84 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
When the BOD is enabled, and V
ure 9-5 on page
above the trigger level (V
after the Time-out period t
The BOD circuit will only detect a drop in V
ger 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
“Watchdog Timer” on page 44
BOT+
= V
BOD
BOT
CC
given in
+ V
INTERNAL
TIME-OUT
External Reset During Operation
Brown-out Reset During Operation
RESET
RESET
HYST
43), the Brown-out Reset is immediately activated. When V
V
CC
/2 and V
“System and Reset Characterizations” on page
TOUT
BOT+
Atmel ATtiny24/44/84 [Preliminary]
BOT-
for details on operation of the Watchdog Timer.
has expired.
in
CC
Figure 9-5 on page
= V
decreases to a value below the trigger level (V
V
BOT
BOT-
- V
CC
HYST
if the voltage stays below the trigger level for lon-
/2.
43), the delay counter starts the MCU
V
t
TOUT
BOT+
181.
CC
BOT-
increases
TOUT
CC
in
. See
level
Fig-
43
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