ATXMEGA384C3_14 Datasheet, PDF (83/125 Pages) ATMEL Corporation – 8/16-bit Atmel XMEGA C3 Microcontroller

35.15 Two-Wire Interface Characteristics
Table 35-28 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 35-
7.
Figure 35-7. Two-wire Interface Bus Timing
t_of
t_HIGH
t_LOW
t_r
SCL
tSU;STA
SDA
tHD;STA
tHD;DAT
tSU;DAT
tSU;STO
tBUF
Table 35-28. 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
t_HD;STA Hold time (repeated) START condition
t_LOW
Low period of SCL clock
t_HIGH High period of SCL clock
t_SU;STA
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
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
f_SCL  100kHz
4.0
f_SCL > 100kHz
0.6
f_SCL  100kHz
4.7
f_SCL > 100kHz
1.3
f_SCL  100kHz
4.0
f_SCL > 100kHz
0.6
f_SCL  100kHz
4.7
f_SCL > 100kHz
0.6
Typ.
Max.
V_CC+0.5
0.3V_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
µs
XMEGA C3 [DATASHEET]
83
Atmel-8361F-AVR-ATxmega384C3-Datasheet–11/2014