ATXMEGA256A3BU Datasheet, PDF (89/143 Pages) ATMEL Corporation – 8/16-bit Atmel XMEGA A3BUMicrocontroller

37.17 Two-Wire Interface Characteristics
Table 37-33 describes the requirements for devices connected to the Two-Wire Interface Bus. The Atmel AVR XMEGA
Two-Wire Interface meets or exceeds these requirements under the noted conditions. Timing symbols refer to Figure 37-
7.
Figure 37-7. Two-Wire Interface bus timing.
tof
tHIGH
tLOW
tr
SCL
tSU;STA
SDA
tHD;STA
t_HD;DAT
tSU;DAT
tSU;STO
tBUF
Table 37-33. Two-wire interface characteristics.
Symbol
V_IH
V_IL
V_hys
V_OL
t_r
t_of
t_SP
I_I
C_I
f_SCL
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
R_P
Value of pull-up resistor
Condition
3mA, sink current
10pF < C_b < 400pF ⁽²⁾
0.1V_CC < V_I < 0.9V_CC
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
f_PER ⁽³⁾>max(10f_SCL, 250kHz)
f_SCL  100kHz
f_SCL > 100kHz
0
V_{----C----C----}–_{-----0---.-4----}V_--
3mA
Typ.
Max.
V_CC+0.5
0.3×V_CC
Units
V
0.4
300
250
ns
50
10
µA
10
pF
400
kHz
1----0--0----n_---s_-
C_b

3----0--0----n_---s_-
C_b
XMEGA A3BU [DATASHEET]
89
8362F–AVR–02/2013