MEGA128CAN Datasheet, PDF (359/413 Pages) ATMEL Corporation – Microcontroller WITH 128K BYTES OF ISP FLASH AND CAN CONTROLLER

AT90CAN128
Two-wire Serial Interface Characteristics
Table 138 describes the requirements for devices connected to the Two-wire Serial Bus.
The AT90CAN128 Two-wire Serial Interface meets or exceeds these requirements
under the noted conditions.
Timing symbols refer to Figure 170.
Table 138. Two-wire Serial Bus Requirements
Symbol Parameter
V_IL
V_IH
V_hys(1)
V_OL(1)
Input Low-voltage
Input High-voltage
Hysteresis of Schmitt Trigger Inputs
Output Low-voltage
t_r(1)
Rise Time for both SDA and SCL
Condition
3 mA sink current
Min
– 0.5
0.7 Vcc
0.05 Vcc ⁽²⁾
0
20 + 0.1C_b
(3)(2)
Max
0.3 Vcc
Vcc + 0.5
–
0.4
300
Units
V
V
V
V
ns
t_of(1)
t_SP(1)
I_i
C_i(1)
f_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
t_HD;STA Hold Time (repeated) START Condition
t_LOW
Low Period of the SCL Clock
t_HIGH
High period of the SCL clock
t_SU;STA
Set-up time for a repeated START
condition
t_HD;DAT Data hold time
t_SU;DAT
Data setup time
10 pF < C_b < 400 pF ⁽³⁾
0.1 V_CC < V_i < 0.9 V_CC
f_CK ⁽⁴⁾ > max(16f_SCL, 250kHz) ⁽⁵⁾
f_SCL ≤ 100 kHz
f_SCL > 100 kHz
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
20 + 0.1C_b
(3)(2)
0
– 10
–
0
V_{-----C---C-3---m-–----}0A_---,_--4_---V_---
V_{-----C---C-3---m-–----}0A_---,_--4_---V_---
4.0
0.6
4.7
1.3
4.0
0.6
4.7
0.6
0
0
250
100
250
ns
50 ⁽²⁾
ns
10
µA
10
pF
400
kHz
1_----0_---0_----0_---n_---s_--
Ω
C_b
-³---⁰---⁰----ⁿ---^s-
Ω
C_b
–
µs
–
µs
–
µs
–
µs
–
µs
–
µs
–
µs
–
µs
3.45
µs
0.9
µs
–
ns
–
ns
4250E–CAN–12/04
359