ATMEGA640 datasheet(362/436 Pages) MICROCHIP

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362

ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET]

DS40002211A

Note:

1. In ATmega640/1280/1281/2560/2561, this parameter is characterized and not 100% tested.

2. Required only for fSCL > 100kHz.

3. Cb = capacitance of one bus line in pF.

4. fCK = CPU clock frequency.

5. This requirement applies to all ATmega640/1280/1281/2560/2561 2-wire Serial Interface operation. Other devices

connected to the 2-wire Serial Bus need only obey the general fSCL requirement.

Table 31-7.

2-wire Serial Bus Requirements

Symbol

Parameter

Condition

Min.

Max.

Units

VIL

Input Low-voltage

-0.5

0.3 VCC

VIH

Input High-voltage

0.7 VCC

VCC + 0.5

Vhys

(1)

Hysteresis of Schmitt Trigger Inputs

0.05 VCC

(2)

–

VOL

(1)

Output Low-voltage

3mA sink current

0.4

(1)

Rise Time for both SDA and SCL

20 +

0.1Cb(3)(2)

300

tof

(1)

Output Fall Time from VIHmin to VILmax

10pF < Cb < 400pF(3)

20 +

0.1Cb

(3)(2)

250

tSP

(1)

Spikes Suppressed by Input Filter

50(2)

Input Current each I/O Pin

0.1VCC < Vi < 0.9VCC

-10

µA

(1)

Capacitance for each I/O Pin

–

fSCL

SCL Clock Frequency

fCK(4) > max(16fSCL,

250kHz)(5)

400

kHz

Value of Pull-up resistor

fSCL  100kHz

fSCL > 100kHz

tHD;STA

Hold Time (repeated) START Condition

fSCL  100kHz

4.0

–

µs

fSCL > 100kHz

0.6

–

tLOW

Low Period of the SCL Clock

fSCL  100kHz

(6)

4.7

–

fSCL > 100kHz

(7)

1.3

–

tHIGH

High period of the SCL clock

fSCL  100kHz

4.0

–

fSCL > 100kHz

0.6

–

tSU;STA

Set-up time for a repeated START condition

fSCL  100kHz

4.7

–

fSCL > 100kHz

0.6

–

tHD;DAT

Data hold time

fSCL  100kHz

3.45

fSCL > 100kHz

0.9

tSU;DAT

Data setup time

fSCL  100kHz

250

–

fSCL > 100kHz

100

–

tSU;STO

Setup time for STOP condition

fSCL  100kHz

4.0

–

fSCL > 100kHz

0.6

–

tBUF

Bus free time between a STOP and START

condition

fSCL  100kHz

4.7

–

fSCL > 100kHz

1.3

–

VCC 0.4V

–

3mA

----------------------------

1000ns

-------------------



VCC 0.4V

–

3mA

----------------------------

300 ns

------------------

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