Datasheet
1159
SAM4S Series [DATASHEET]
11100F–ATARM–29-Jan-14
44.12.8 Two-wire Serial Interface Characteristics
Table 44-69 describes the requirements for devices connected to the Two-wire serial bus. For timing symbols refer to Figure 44-
36.
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:
Table 44-69. 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 0.7 x V
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 44-36
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 × t
CP_MCK
(5)
µs
f
TWCK
> 100 kHz 0 3 × t
CP_MCK
(5)
µs
t
SU;DAT
Data Setup Time
f
TWCK
≤ 100 kHz
t
LOW -
3 ×
t
CP_MCK
(5)
—ns
f
TWCK
> 100 kHz
t
LOW -
3 ×
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
t
BUF
Bus Free Time between a STOP and START
Condition
f
TWCK
≤ 100 kHz t
LOW
—µs
f
TWCK
> 100 kHz t
LOW
—µs
V
VDDIO
0.4V–
3mA
--------------------------------------
1000ns
C
b
-------------------
Ω
V
VDDIO
0.4V–
3mA
--------------------------------------
300ns
C
b
----------------
Ω
t
low
CLDIV( 2
CKDIV
×()4)+ t
MCK
×=