ATMEGA324P-A15MZ Atmel, ATMEGA324P-A15MZ Datasheet - Page 39

• Manufacturer Part Number: ATMEGA324P-A15MZ
• Description: MCU AVR 32KB FLASH 15MHZ 44-VQFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA324P-A15MZ

• Package / Case: 44-VQFN Exposed Pad
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Speed: 16MHz
• Number Of I /o: 32
• Eeprom Size: 1K x 8
• Core Processor: AVR
• Program Memory Type: FLASH
• Ram Size: 2K x 8
• Program Memory Size: 32KB (32K x 8)
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Connectivity: I²C, SPI, UART/USART
• Core Size: 8-Bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

External Reset
Brown-out Detection
2503N–AVR–06/08
An External Reset is generated by a low level on the RESET pin. Reset pulses longer than the
minimum pulse width (see
Shorter pulses are not guaranteed to generate a reset. When the applied signal reaches the
Reset Threshold Voltage – V
the Time-out period t
Figure 18. External Reset During Operation
ATmega32 has an On-chip Brown-out Detection (BOD) circuit for monitoring the V
ing operation by comparing it to a fixed trigger level. The trigger level for the BOD can be
selected by the fuse BODLEVEL to be 2.7V (BODLEVEL unprogrammed), or 4.0V (BODLEVEL
programmed). 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
The BOD circuit can be enabled/disabled by the fuse BODEN. When the BOD is enabled
(BODEN programmed), and V
19), the Brown-out Reset is immediately activated. When V
(V
expired.
The BOD circuit will only detect a drop in V
ger than t
Figure 19. Brown-out Reset During Operation
BOT
BOT+
- V
in
HYST
BOD
Figure
/2.
given in
CC
INTERNAL
TIME-OUT
19), the delay counter starts the MCU after the Time-out period t
RESET
RESET
TOUT
V
Table
CC
has expired.
15.
Table
RST
CC
– on its positive edge, the delay counter starts the MCU after
decreases to a value below the trigger level (V
15) will generate a reset, even if the clock is not running.
V
BOT-
CC
if the voltage stays below the trigger level for lon-
CC
V
BOT+
t
TOUT
BOT+
increases above the trigger level
= V
BOT
ATmega32(L)
+ V
HYST
/2 and V
BOT-
CC
level dur-
TOUT
in
Figure
BOT-
has
39
=