ATmega640 Atmel Corporation, ATmega640 Datasheet - Page 379
ATmega640
Manufacturer Part Number
ATmega640
Description
Manufacturer
Atmel Corporation
Specifications of ATmega640
Flash (kbytes)
64 Kbytes
Pin Count
100
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
86
Ext Interrupts
32
Usb Speed
No
Usb Interface
No
Spi
5
Twi (i2c)
1
Uart
4
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
16
Adc Resolution (bits)
10
Adc Speed (ksps)
15
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
8
Eeprom (bytes)
4096
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
1.8 to 5.5
Operating Voltage (vcc)
1.8 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
6
Output Compare Channels
16
Input Capture Channels
4
Pwm Channels
15
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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Table 31-10. ADC Characteristics, Differential Channels (Continued)
Note:
31.9
Table 31-11. External Data Memory Characteristics, 4.5 to 5.5 Volts, No Wait-state
Notes:
2549N–AVR–05/11
0
1
2
3a
3b
4
5
6
7
8
9
10
11
12
13
14
15
16
Symbol
AVCC
R
V
V
R
V
V
REF
DIFF
REF
AIN
INT
IN
Symbol
1/t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
LHLL
AVLL
LLAX_ST
LLAX_LD
AVLLC
AVRL
AVWL
LLWL
LLRL
DVRH
RLDV
RHDX
RLRH
DVWL
WHDX
DVWH
WLWH
Values are guidelines only.
External Data Memory Timing
1. This assumes 50% clock duty cycle. The half period is actually the high time of the external clock, XTAL1.
2. This assumes 50% clock duty cycle. The half period is actually the low time of the external clock, XTAL1.
CLCL
Parameter
Analog Supply Voltage
Reference Voltage
Input Voltage
Input Differential Voltage
ADC Conversion Output
Input Bandwidth
Internal Voltage Reference
Reference Input Resistance
Analog Input Resistance
Parameter
Oscillator Frequency
ALE Pulse Width
Address Valid A to ALE Low
Address Hold After ALE Low,
write access
Address Hold after ALE Low,
read access
Address Valid C to ALE Low
Address Valid to RD Low
Address Valid to WR Low
ALE Low to WR Low
ALE Low to RD Low
Data Setup to RD High
Read Low to Data Valid
Data Hold After RD High
RD Pulse Width
Data Setup to WR Low
Data Hold After WR High
Data Valid to WR High
WR Pulse Width
8MHz Oscillator
57.5
57.5
47.5
47.5
42.5
Min
115
115
115
115
115
125
115
40
5
5
0
ATmega640/1280/1281/2560/2561
Condition
Max
67.5
67.5
75
0.5t
0.5t
0.5t
0.5t
0.5t
1.0t
1.0t
1.0t
1.0t
1.0t
1.0t
-V
1.0t
V
CLCL
CLCL
CLCL
CLCL
CLCL
Min
REF
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
CC
0.0
Min
GND
40
-511
5
5
0
2.7
2.3
CLCL
Variable Oscillator
- 0.3
/Gain
-15
-15
-20
-5
-5
-10
-10
-10
-10
-10
-10
(1)
(1)
(1)
(2)
(2)
(1)
Typ
2.56
100
32
4
(1)
0.5t
0.5t
1.0t
CLCL
CLCL
Max
AVCC - 0.5
CLCL
V
16
V
REF
Max
CC
+5
+5
V
511
2.8
-50
+ 0.3
CC
/Gain
(2)
(2)
(1)
Unit
Units
MHz
LSB
kHz
MΩ
kΩ
ns
V
V
379
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