ATmega32A Atmel Corporation, ATmega32A Datasheet - Page 300

• Manufacturer Part Number: ATmega32A
• Manufacturer: Atmel Corporation

Specifications of ATmega32A

• Flash (kbytes): 32 Kbytes
• Pin Count: 44
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 32
• Ext Interrupts: 3
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• 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): 2
• Eeprom (bytes): 1024
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• 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

27.5
8155C–AVR–02/11
System and Reset Characteristics
Figure 27-3. External Clock Drive
Figure 27-4. External RC Oscillator, Typical Frequencies (V
Notes:
Table 27-1.
Notes:
Symbol
t
t
Δ
CLCH
CHCL
Symbol
t
V
CLCL
V
V
V
t
t
V
BOD
t
I
RST
HYST
POT
RST
BOT
BG
BG
BG
1. R should be in the range 3 kΩ - 100 kΩ, and C should be at least 20 pF. The C values given in
2. The frequency will vary with package type and board layout.
1. The Power-on Reset will not work unless the supply voltage has been below V
2. V
the table includes pin capacitance. This will vary with package type.
this is the case, the device is tested down to V
Parameter
Power-on Reset Threshold
Voltage (rising)
Power-on Reset Threshold
Voltage (falling)
Voltage
Minimum pulse width on
RESET Pin
Brown-out Reset Threshold
Voltage
Minimum low voltage period
for Brown-out Detection
Brown-out Detector
hysteresis
Bandgap reference voltage
Bandgap reference start-up
time
Bandgap reference current
consumption
BOT
RESET Pin Threshold
Parameter
Rise Time
Fall Time
Change in period from
one clock cycle to the
next
R [kΩ]
Reset, Brown-out and Internal Voltage Reference Characteristics
may be below nominal minimum operating voltage for some devices. For devices where
33
10
(2)
(1)
(1)
V
Min
CC
BODLEVEL = 1
BODLEVEL = 0
BODLEVEL = 1
BODLEVEL = 0
Condition
= 2.7V to
C [pF]
22
22
CC
Max
5.5
1.6
1.6
2
= V
V
BOT
0.2 V
CC
1.15
during the production test. This guar-
Min
2.5
3.6
= 5V)
V
CC
Min
CC
= 4.5V to
1.23
Typ
1.4
1.3
2.7
4.0
50
40
10
2
2
ATmega32A
Max
0.9 V
5.5
0.5
0.5
650kHz
2.0MHz
2
Max
1.35
2.3
2.3
1.5
2.9
4.2
70
f
V
POT
(2)
CC
(falling).
Units
Units
μs
μs
mV
%
µA
µs
µs
µs
µs
V
V
V
V
V
300