atmega32u4-16mu ATMEL Corporation, atmega32u4-16mu Datasheet - Page 400

• Manufacturer Part Number: atmega32u4-16mu
• Description: Atmega32u4 8-bit Avr Microcontroller With 32k Bytes Of Isp Flash And Usb Controller
• Manufacturer: ATMEL Corporation

30.6
Table 30-2
Interface meets or exceeds these requirements under the noted conditions.
Timing symbols refer to
Table 30-2.
400
Symbol
VIL
VIH
Vhys
VOL
tr
tof
tSP
I
C
f
Rp
t
t
i
SCL
HD;STA
LOW
(1)
(1)
i
(1)
(1)
(1)
(1)
2-wire Serial Interface Characteristics
ATmega32U4
Parameter
Input Low-voltage
Input High-voltage
Hysteresis of Schmitt Trigger Inputs
Output Low-voltage
Rise Time for both SDA and SCL
Output Fall Time from V
Spikes Suppressed by Input Filter
Input Current 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 the SCL Clock
describes the requirements for devices connected to the 2-wire Serial Bus. The ATmega32U4 2-wire Serial
2-wire Serial Bus Requirements
Figure
Figure 30-2. Maximum Frequency vs. V
30-3.
IHmin
to V
ILmax
f
CK
(4)
10 pF < C
0.1V
> max(16f
3 mA sink current
f
f
SCL
SCL
f
f
f
f
SCL
SCL
SCL
SCL
CC
Condition
≤ 100 kHz
> 100 kHz
≤ 100 kHz
> 100 kHz
≤ 100 kHz
> 100 kHz
< V
b
CC
< 400 pF
SCL
i
< 0.9V
, ATmega32U4
, 250kHz)
(6)
(7)
CC
(3)
(5)
20 + 0.1C
20 + 0.1C
V
----------------------------
V
----------------------------
0.05 V
CC
CC
0.7 V
3mA
3mA
-0.5
Min
-10
4.0
0.6
4.7
1.3
–
–
0
0
–
0
0,4V
0,4V
CC
CC
b
b
(2)
(3)(2)
(3)(2)
V
1000ns
------------------ -
0.3 V
CC
300ns
--------------- -
50
Max
300
250
400
0.4
C
10
10
C
–
–
–
–
–
+ 0.5
(2)
b
b
CC
7766A–AVR–03/08
Units
kHz
µA
ns
ns
ns
pF
µs
µs
µs
µs
Ω
Ω
V
V
V
V