Datasheet

1463
SAM4E [DATASHEET]
Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14
47.11.7 Two-wire Serial Interface Characteristics
Table 47-63 describes the requirements for devices connected to the Two-wire Serial Bus. For timing symbols refer to Fig-
ure 47-28.
Notes: 1. Required only for f
TWCK
> 100 kHz.
2. C
B
= capacitance of one bus line in pF. Per I2C Standard, C
B
Max = 400 pF
3. The TWCK low period is defined as follows:
4. The TWCK high period is defined as follows:
5. t
CP_MCK
= MCK Bus Period.
Table 47-63. Two-wire Serial Bus Requirements
Symbol Parameter Condition Min Max Units
V
IL
Low-level input voltage — -0.3 0.3 V
VDDIO
V
V
IH
High-level input voltage — 0.7xV
VDDIO
V
CC
+ 0.3 V
V
HYS
Hysteresis of Schmitt Trigger Inputs — 0.150 — V
V
OL
Low-level output voltage 3 mA sink current — 0.4 V
t
R
Rise Time for both TWD and TWCK 20 + 0.1C
b
(1)(2)
300 ns
t
OF
Output Fall Time from V
IHmin
to V
ILmax
10 pF < C
b
< 400 pF
Figure 47-28
20 + 0.1C
b
(1)(2)
250 ns
C
i
(1)
Capacitance for each I/O Pin — — 10 pF
f
TWCK
TWCK Clock Frequency — 0 400 kHz
R
P
Value of Pull-up resistor
f
TWCK
≤ 100 kHz
Ω
f
TWCK
> 100 kHz
Ω
t
LOW
Low Period of the TWCK clock
f
TWCK
≤ 100 kHz
(3)
—µs
f
TWCK
> 100 kHz
(3)
—µs
t
HIGH
High Period of the TWCK clock
f
TWCK
≤ 100 kHz
(4)
—µs
f
TWCK
> 100 kHz
(4)
—µs
t
HD;STA
Hold Time (repeated) START Condition
f
TWCK
≤ 100 kHz t
HIGH
—µs
f
TWCK
> 100 kHz t
HIGH
—µs
t
SU;STA
Set-up time for a repeated START condition
f
TWCK
≤ 100 kHz t
HIGH
—µs
f
TWCK
> 100 kHz t
HIGH
—µs
t
HD;DAT
Data hold time
f
TWCK
≤ 100 kHz 0 3 x t
CP_MCK
(5)
µs
f
TWCK
> 100 kHz 0 3 x t
CP_MCK
(5)
µs
t
SU;DAT
Data setup time
f
TWCK
≤ 100 kHz
t
LOW
- 3 x
t
CP_MCK
(5)
—ns
f
TWCK
> 100 kHz
t
LOW
- 3 x
t
CP_MCK
(5)
—ns
t
SU;STO
Setup time for STOP condition
f
TWCK
≤ 100 kHz t
HIGH
—µs
f
TWCK
> 100 kHz t
HIGH
—µs
t
HD;STA
Hold Time (repeated) START Condition
f
TWCK
≤ 100 kHz t
HIGH
—µs
f
TWCK
> 100 kHz t
HIGH
—µs
V
VDDIO
0.4V–
3mA
-------------------------------------
1000ns
C
b
-----------------
V
VDDIO
0.4V–
3mA
-------------------------------------
300ns
C
b
--------------
t
low
CLDIV( 2
CKDIV
×()4)+ t
MCK
×=
t
high
CHDIV( 2
CKDIV
×()4 )+ t
MCK
×=