ATTINY88 Datasheet, PDF (213/246 Pages) ATMEL Corporation – High Endurance Non-volatile Memory Segments

ATtiny88 Automotive
21.7 2-wire Serial Interface Characteristics
Table 21-7 describes the requirements for devices connected to the 2-wire Serial Bus. The ATtiny88 2-wire Serial Interface
meets or exceeds these requirements under the noted conditions.
Timing symbols refer to Figure 21-3.
Table 21-7. 2-wire Serial Bus Requirements
Symbol Parameter
VIL
VIH
(1)
Vhys
(1)
VOL
(1)
tr
(1)
tof
(1)
tSP
I_i
C_i(1)
f_SCL
Input Low-voltage
Input High-voltage
Hysteresis of Schmitt Trigger Inputs
Output Low-voltage
Rise Time for both SDA and SCL
Output Fall Time from V_IHmin to V_ILmax
Spikes Suppressed by Input Filter
Input Current each I/O Pin
Capacitance for each I/O Pin
SCL Clock Frequency
Rp
Value of Pull-up resistor
Condition
3 mA sink current
10 pF < C_b < 400 pF⁽³⁾
0.1V_CC < V_i < 0.9V_CC
f_CK(4) > max(16f_SCL, 250kHz)⁽⁵⁾
f_SCL ≤100 kHz
f_SCL > 100 kHz
t_HD;STA
t_LOW
t_HIGH
t_SU;STA
t_HD;DAT
t_SU;DAT
t_SU;STO
t_BUF
Hold Time (repeated) START Condition
Low Period of the SCL Clock
High period of the SCL clock
Set-up time for a repeated START condition
Data hold time
Data setup time
Setup time for STOP condition
Bus free time between a STOP and START
condition
f_SCL ≤100 kHz
f_SCL > 100 kHz
f_SCL ≤100 kHz⁽⁶⁾
f_SCL > 100 kHz⁽⁷⁾
f_SCL ≤100 kHz
f_SCL > 100 kHz
f_SCL ≤100 kHz
f_SCL > 100 kHz
f_SCL ≤100 kHz
f_SCL > 100 kHz
f_SCL ≤100 kHz
f_SCL > 100 kHz
f_SCL ≤100 kHz
f_SCL > 100 kHz
f_SCL ≤100 kHz
f_SCL > 100 kHz
Notes:
1. This parameter is characterized, only, and not fully tested.
2. Required only for f_SCL > 100 kHz.
3. C_b = capacitance of one bus line in pF.
Min
-0.5
0.7 V_CC
0.05 V_CC(2)
0
20 + 0.1C_b(3)(2)
20 + 0.1C_b(3)(2)
0
-10
–
0
V_{----C----C----–-----}0_---,_--4_---V_---
3mA
V_{----C----C----–-----}0_---,_--4_---V_---
3mA
4.0
0.6
4.7
1.3
4.0
0.6
4.7
0.6
0
0
250
100
4.0
0.6
4.7
1.3
Max
0.3 V_CC
V_CC + 0.5
–
0.4
300
250
50⁽²⁾
10
10
400
1_----0_---0_----0_---n_---s_--
C_b
3_----0_---0_----n_---s_-
C_b
–
–
–
–
–
–
–
–
3.45
0.9
–
–
–
–
–
–
Unit
V
V
V
V
ns
ns
ns
µA
pF
kHz
Ω
Ω
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
ns
ns
µs
µs
µs
µs
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