ATXMEGA256A3U Datasheet, PDF (80/116 Pages) ATMEL Corporation – 8/16-bit Atmel XMEGA A3U Microcontroller

XMEGA A3U
35.16 Two-Wire Interface Characteristics
Table 2-1 describes the requirements for devices connected to the Two Wire Serial Bus. The
XMEGA Two-Wire Interface meets or exceeds these requirements under the noted conditions.
Timing symbols refer to Figure 35-6.
Figure 35-6. Two-Wire Interface Bus Timing
tof
tHIGH
tLOW
tr
SCL
tSU;STA
SDA
tHD;STA
tHD;DAT
tSU;DAT
tSU;STO
tBUF
Table 35-24. Two Wire Serial Bus Characteristics
Symbol
V_IH
V_IL
V_hys
V_OL
t_r
t_of
t_SP
I_I
C_I
f_SCL
R_P
t_HD;STA
t_LOW
t_HIGH
t_SU;STA
Parameter
Input High Voltage
Input Low Voltage
Hysteresis of Schmitt Trigger Inputs
Output Low Voltage
Rise Time for both SDA and SCL
Output Fall Time from V_IHmin to V_ILmax
Spikes Suppressed by Input Filter
Input Current for each I/O Pin
Capacitance for each I/O Pin
SCL Clock Frequency
Value of Pull-up resistor
Hold Time (repeated) START condition
Low Period of SCL Clock
High Period of SCL Clock
Set-up time for a repeated START condition
Condition
3mA, sink current
10pF < C_b < 400pF⁽²⁾
0.1V_CC < V_I < 0.9V_CC
f_PER⁽³⁾>max(10f_SCL, 250kHz)
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
Min
0.7V_CC
0.5
0.05V_CC⁽¹⁾
0
20+0.1C_b⁽¹⁾⁽²⁾
20+0.1C_b⁽¹⁾⁽²⁾
0
-10
0
V_{----C----C----–-----}0_---._--4_----V_--
3mA
4.0
0.6
4.7
1.3
4.0
0.6
Unit
Typ
Max
s
V_CC+0.5
0.3*V_CC
V
0.4
300
250
ns
50
10
µA
10
pF
400
kHz
3_----0_---0_----m_-----s
C_b
Ω
µs
80
8386A–AVR–07/11