Data Sheet

951
Atmel | SMART SAM D21 [DATASHEET]
Atmel-42181G–SAM-D21_Datasheet–09/2015
36.8.2 I
2
C Pins
Refer to “I/O Multiplexing and Considerations” on page 21 to get the list of I
2
C pins.
I
2
C pins timing characteristics can be found in “SERCOM in I2C Mode Timing” on page 989.
36.8.3 XOSC Pin
XOSC pins behave as normal pins when used as normal I/Os. Refer to table “Normal I/O Pins Characteristics”.
36.8.4 XOSC32 Pin
XOSC32 pins behave as normal pins when used as normal I/Os. Refer to table “Normal I/O Pins Characteristics”.
36.8.5 External Reset Pin
Reset pin has the same electrical characteristics as normal I/O pins. Refer to table “Normal I/O Pins Characteristics”.
Table 36-15. I
2
C Pins Characteristics in I
2
C configuration
Symbol Parameter Condition Min. Typ. Max. Units
R
PULL
Pull-up - Pull-down resistance
I
20 40 60 kΩ
V
IL
Input low-level voltage
V
DD
=1.62V-2.7V I - - 0.25*V
DD
V
V
DD
=2.7V-3.63V - - 0.3*V
DD
V
IH
Input high-level voltage
V
DD
=1.62V-2.7V 0.7*V
DD
- -
V
DD
=2.7V-3.63V I 0.55*V
DD
- -
V
HYS
Hysteresis of Schmitt trigger inputs 0.08*V
DD
- -
V
OL
Output low-level voltage
V
DD
> 2.0V I,
I
OL
=3mA
- - 0.4
V
DD
≤2.0V
I
OL
=2mA
- - 0.2*V
DD
C
I
Capacitance for each I/O Pin
I
pF
I
OL
Output low-level current
V
OL
=0.4V
Standard, Fast
and HS Modes
3
mA
V
OL
=0.4V
Fast Mode +
20 - -
V
OL
=0.6V 6 - -
f
SCL
SCL clock frequency
I
- - 3.4 MHz
R
P
Value of pull-up resistor
f
SCL
≤ 100kHz
Ω
f
SCL
> 100kHz