Datasheet

1088
SAM4S [DATASHEET]
11100E–ATARM–24-Jul-13
43.11.8 Two-wire Serial Interface Characteristics
Table 43-56 describes the requirements for devices connected to the Two-wire Serial Bus. For timing symbols refer to Figure 43-
32.
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 43-56. Two-wire Serial Bus Requirements
Symbol Parameter Condition Min Max Units
V
IL
Input Low-voltage -0.3 0.3 V
VDDIO
V
V
IH
Input High-voltage 0.7xV
VDDIO
V
CC
+ 0.3 V
V
HYS
Hysteresis of Schmitt Trigger Inputs 0.150 — V
V
OL
Output Low-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 43-32
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
Rp Value of Pull-up Resistor
f
TWCK
≤ 100 kHz
f
TWCK
> 100 kHz
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
0,4
V
–
3mA
------------------------------------
--
1000ns
C
b
-------------------
Ω
V
VDDIO
0,4V–
3mA
--------------------------------------
300ns
C
b
----------------
Ω
T
low
CLDIV( 2
CKDIV
×()4)+ T
MCK
×=
T
high
CHDIV( 2
CKDIV
×()4)+ T
MCK
×=