ATmega128
Two-wire Serial Interface Characteristics
Table 133 describes the requirements for devices connected to the Two-wire Serial Bus. The ATmega128 Two-wire Serial
Interface meets or exceeds these requirements under the noted conditions.
Timing symbols refer to Figure 154 .
Table 133. Two-wire Serial Bus Requirements
Symbol
V IL
Parameter
Input Low-voltage
Condition
Min
-0.5
Max
0.3 V CC
Units
0.05 V CC
V IH
V hys
(1)
Input High-voltage
Hysteresis of Schmitt Trigger Inputs
0.7 V CC
(2)
V CC + 0.5
V
V OL (1)
t r (1)
Output Low-voltage
Rise Time for both SDA and SCL
3mA sink current
0
20 + 0.1C b (3)(2)
0.4
300
t of (1)
Output Fall Time from V IHmin to V ILmax
10pF < C b < 400pF
(3)
20 + 0.1C b
(3)(2)
250
ns
50
t SP (1)
Spikes Suppressed by Input Filter
0
(2)
I i
C i (1)
Input Current each I/O Pin
Capacitance for each I/O Pin
0.1 V CC < V i < 0.9 V CC
-10
10
10
μA
pF
f SCL
SCL Clock Frequency
f CK (4)
> max(16f SCL , 250kHz)
(5)
0
400
kHz
V CC – 0.4V
V CC – 0.4V
300ns
C b
Rp
t HD;STA
t LO W
t HIGH
t SU;STA
t HD;DAT
t SU;DAT
t SU;STO
t BUF
Value of Pull-up resistor
Hold Time (repeated) START Condition
Low Period of the SCL Clock
High period of the SCL clock
Set-up time for a repeated START condition
Data hold time
Data setup time
Setup time for STOP condition
Bus free time between a STOP and START
condition
f SCL ≤ 100kHz
f SCL > 100kHz
f SCL ≤ 100kHz
f SCL > 100kHz
f SCL ≤ 100kHz
f SCL > 100kHz
f SCL ≤ 100kHz
f SCL > 100kHz
f SCL ≤ 100kHz
f SCL > 100kHz
f SCL ≤ 100kHz
f SCL > 100kHz
f SCL ≤ 100kHz
f SCL > 100kHz
f SCL ≤ 100kHz
f SCL > 100kHz
f SCL ≤ 100kHz
----------------------------
3mA
----------------------------
3mA
4.0
0.6
4.7
1.3
4.0
0.6
4.7
0.6
0
0
250
100
4.0
0.6
4.7
------------------ -
1000ns
C b
----------------
3.45
0.9
Ω
Ω
μs
ns
μs
Notes:
1.
2.
3.
4.
In ATmega128, this parameter is characterized and not 100% tested.
Required only for f SCL > 100kHz.
C b = capacitance of one bus line in pF.
f CK = CPU clock frequency
322
2467X–AVR–06/11
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