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Atmel Evaluation Kit AT91SAM9G25-EK AT91SAM9G25-EK Data Sheet

Product codes
AT91SAM9G25-EK
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Page of 1165
1133
SAM9G25 [DATASHEET]
11032D–ATARM–10-Mar-2014
46.19 Two-wire Interface Characteristics
 describes the requirements for devices connected to the Two-wire Serial Bus.
.
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:  t
low
 = ((CLDIV 
× 2
CKDIV
) + 4) 
× t
MCK
4. The TWCK high period is defined as follows: t
high
 = ((CHDIV × 2
CKDIV
) + 4 
× t
MCK
5. t
CP_MCK 
= MCK bus period. 
Table 46-50. Two-wire Serial Bus Requirements
Symbol
Parameter
Conditions
Min
Max
Unit
V
IL
Input Low-voltage
—
-0.3
0.3 
× V
DDIO
V
V
IH
Input High-voltage
—
0.7 
× V
DDIO
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
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
(V
DDIO
 - 0.4V) ÷ 3mA
1000ns ÷ C
b
Ω
f
TWCK
 > 100 kHz
(V
DDIO
 - 0.4V) ÷ 3mA
300ns ÷ C
b
Ω
t
LOW
Low Period of the TWCK Clock
f
TWCK
 
≤ 100 kHz
—
µ
s
f
TWCK
 > 100 kHz
—
µ
s
t
HIGH
High Period of the TWCK Clock
f
TWCK
 
≤ 100 kHz
—
µ
s
f
TWCK
 > 100 kHz
—
µ
s
t
HD;STA
Hold Time (repeated) START condition
f
TWCK
 
≤ 100 kHz
t
HIGH
—
µ
s
f
TWCK
 > 100 kHz
t
HIGH
—
µ
s
t
SU;STA
Set-up Time for a Repeated START 
condition
f
TWCK
 
≤ 100 kHz
t
HIGH
—
µ
s
f
TWCK
 > 100 kHz
t
HIGH
—
µ
s
t
HD;DAT
Data Hold Time
f
TWCK
 
≤ 100 kHz
0
3 
× t
CP_MCK
µ
s
f
TWCK
 > 100 kHz
0
3 
× t
CP_MCK
µ
s
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
—
µ
s
f
TWCK
 > 100 kHz
t
HIGH
—
µ
s
t
HD;STA
Bus free time between a STOP and 
START condition
f
TWCK
 
≤ 100 kHz
t
HIGH
—
µ
s
f
TWCK
 > 100 kHz
t
HIGH
—
µ
s