SAM3U_14 Datasheet, PDF (1150/1187 Pages) ATMEL Corporation – From 64 to 256 Kbytes embedded Flash

43.8.7 Two-wire Serial Interface Characteristics
Table 30 describes the requirements for devices connected to the Two-wire Serial Bus. For timing symbols refer to Figure
43-30.
Table 43-50. Two-wire Serial Bus Requirements
Symbol
V_IL
V_IH
V_hys
V_OL
t_r
Parameter
Input Low-voltage
Input High-voltage
Hysteresis of Schmitt Trigger Inputs
Output Low-voltage
Rise Time for both TWD and TWCK
t_of
Output Fall Time from V_IHmin to V_ILmax
C_i(1)
f_TWCK
Capacitance for each I/O Pin
TWCK Clock Frequency
Rp
Value of Pull-up resistor
t_LOW
Low Period of the TWCK clock
t_HIGH
High period of the TWCK clock
t_HD;STA Hold Time (repeated) START Condition
t_SU;STA Set-up time for a repeated START condition
t_HD;DAT
Data hold time
t_SU;DAT
Data setup time
t_SU;STO Setup time for STOP condition
t_HD;STA Hold Time (repeated) START Condition
Condition
3 mA sink current
10 pF < C_b < 400 pF
Figure 43-30
f_TWCK ≤100 kHz
f_TWCK > 100 kHz
f_TWCK ≤100 kHz
f_TWCK > 100 kHz
f_TWCK ≤100 kHz
f_TWCK > 100 kHz
f_TWCK ≤100 kHz
f_TWCK > 100 kHz
f_TWCK ≤100 kHz
f_TWCK > 100 kHz
f_TWCK ≤100 kHz
f_TWCK > 100 kHz
f_TWCK ≤100 kHz
f_TWCK > 100 kHz
f_TWCK ≤100 kHz
f_TWCK > 100 kHz
f_TWCK ≤100 kHz
f_TWCK > 100 kHz
Min
-0.3
0.7xV_VDDIO
0.150
-
20 + 0.1C_b(1)(2)
20 + 0.1C_b(1)(2)
–
0
V_{----V----D---D----I--O-----–----}0_----,_-4_----V_--
3mA
V_{----V----D---D----I--O-----–----}0_----,_-4_----V_--
3mA
(3)
(3)
(4)
(4)
t_HIGH
t_HIGH
t_HIGH
t_HIGH
0
0
t_{LOW -} 3 x
T_{CP_MCK}
t_{LOW -} 3 x
T_{CP_MCK}
t_HIGH
t_HIGH
t_HIGH
t_HIGH
Note: 1. Required only for f_TWCK > 100 kHz.
2. C_b = capacitance of one bus line in pF. Per I2C Standard compatibility, C_b Max = 400pF
3. The TWCK low Period is defined as follow: 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.
Max
0.3 V_VDDIO
V_CC + 0.3
–
0.4
300
250
10
400
1_----0_---0_----0_---n_---s_--
C_b
3_----0_---0_----n_---s_-
C_b
–
–
–
–
–
–
–
–
3 x T_{CP_MCK}
3 x T_{CP_MCK}
–
–
–
–
–
–
Units
V
V
V
V
ns
ns
pF
kHz
Ω
Ω
μs
μs
μs
μs
μs
μs
μs
μs
μs
μs
ns
ns
μs
μs
μs
μs
1150 SAM3U Series
6430F–ATARM–21-Feb-12