Atmel ARM-Based Evaluation Kit for SAM4S16C, 32-Bit ARM® Cortex® Microcontroller ATSAM4S-WPIR-RD ATSAM4S-WPIR-RD Data Sheet
Product codes
ATSAM4S-WPIR-RD
1181
SAM4S Series [DATASHEET]
Atmel-11100G-ATARM-SAM4S-Datasheet_27-May-14
44.12.8 Two-wire Serial Interface Characteristics
describes the requirements for devices connected to the Two-wire serial bus. For timing symbols refer to
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 44-70.
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
300
ns
t
OF
Output Fall Time from V
IHmin
to V
ILmax
10 pF < C
b
< 400 pF
20 + 0.1C
b
250
ns
C
i
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
—
µs
f
TWCK
> 100 kHz
—
µs
t
HIGH
High Period of the TWCK Clock
f
TWCK
≤ 100 kHz
—
µs
f
TWCK
> 100 kHz
—
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
µs
f
TWCK
> 100 kHz
0
3 × t
CP_MCK
µs
t
SU;DAT
Data Setup Time
f
TWCK
≤ 100 kHz
t
LOW -
3 ×
t
CP_MCK
—
ns
f
TWCK
> 100 kHz
t
LOW -
3 ×
t
CP_MCK
—
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
×
=