ATtiny48 datasheet(207/266 Pages) ATMEL

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207

8008C–AVR–03/09

ATtiny48/88

21.8

2-wire Serial Interface Characteristics

Table 21-7 describes the requirements for devices connected to the 2-wire Serial Bus. The ATtiny48/88 2-wire Serial Inter-

face meets or exceeds these requirements under the noted conditions.

Timing symbols refer to Figure 21-3.

Notes:

1. This parameter is characterized, only, and not fully tested.

2. Required only for f

SCL > 100 kHz.

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

Table 21-7.

2-wire Serial Bus Requirements

Symbol

Parameter

Condition

Min

Max

Unit

VIL

Input Low-voltage

-0.5

0.3 VCC

VIH

Input High-voltage

0.7 V

CC + 0.5

Vhys

(1)

Hysteresis of Schmitt Trigger Inputs

0.05 VCC

(2)

–V

VOL

(1)

Output Low-voltage

3 mA sink current

0.4

(1)

Rise Time for both SDA and SCL

20 + 0.1C

(3)(2)

300

tof

(1)

Output Fall Time from VIHmin to VILmax

10 pF < Cb < 400 pF

(3)

20 + 0.1Cb

(3)(2)

250

tSP

(1)

Spikes Suppressed by Input Filter

50(2)

Input Current each I/O Pin

0.1V

CC < Vi < 0.9VCC

-10

µA

(1)

Capacitance for each I/O Pin

–

fSCL

SCL Clock Frequency

fCK

(4) > max(16f

SCL, 250kHz)

(5)

400

kHz

Value of Pull-up resistor

SCL ≤ 100 kHz

SCL > 100 kHz

HD;STA

Hold Time (repeated) START Condition

SCL ≤ 100 kHz

4.0

–

µs

fSCL > 100 kHz

0.6

–

µs

tLOW

Low Period of the SCL Clock

SCL ≤ 100 kHz

(6)

4.7

–

µs

SCL > 100 kHz

(7)

1.3

–

µs

HIGH

High period of the SCL clock

fSCL ≤ 100 kHz

4.0

–

µs

SCL > 100 kHz

0.6

–

µs

SU;STA

Set-up time for a repeated START condition

SCL ≤ 100 kHz

4.7

–

µs

fSCL > 100 kHz

0.6

–

µs

tHD;DAT

Data hold time

SCL ≤ 100 kHz

3.45

µs

SCL > 100 kHz

0.9

µs

SU;DAT

Data setup time

fSCL ≤ 100 kHz

250

–

SCL > 100 kHz

100

–

SU;STO

Setup time for STOP condition

SCL ≤ 100 kHz

4.0

–

µs

fSCL > 100 kHz

0.6

–

µs

tBUF

Bus free time between a STOP and START

condition

SCL ≤ 100 kHz

4.7

–

µs

fSCL > 100 kHz

1.3

–

µs

0,4V

–

3mA

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

1000ns

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

0,4V

–

3mA

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

300ns

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

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