Datasheet
TMC223 DATASHEET (V. 1.00 / May 3rd, 2007) 29
Copyright © 2007 TRINAMIC Motion Control GmbH & Co. KG
6.6 Timing characteristics of the serial interface
SDA
SCL
t
f
START
t
HD;STA
t
LOW
t
r
t
HIGH
t
f
t
HD;DAT
t
SU;DAT
t
HD;STA
t
SU;STA
t
r
t
BUF
t
SU;STO
STARTSTOPSTART
Figure 21: Definition of Timing
SCL Clk frequency <= 100KHz SCL Clk frequency <= 350KHz
Parameter Symbol
Min. Max. Min. Max.
Unit
Low level input voltage:
Fixed input levels
V
IL
-0.5
(1)
1.5 -0.5
(1)
0.3V
DD
V
High level input voltage:
Fixed input levels
V
IH
3.0
(2)
0.7V
DD
(2)
V
Pulse width of spikes which must be
suppressed by the input filter
t
SP
n/a n/a 50 50 ns
Capacitance for each I/O pin C
i
- 10 - 10 pF
Table 13: Two Wire Serial Interface - Characteristics of the SDA and SCL I/O Stages
Notes
(1): If Input voltage = < -0.3 Volts, then 20…100 Ohms resistor must be added in series
(2): Maximum V
IH
= V
DDmax
+ 0.5 Volt
n/a: not applicable
SCL Clk frequency <= 100KHz SCL Clk frequency <= 350KHz
Parameter Symbol
Min. Max. Min. Max.
Unit
SCL clock frequency f
SCL
0 100 0 350 KHz
Hold time (repeated) START
condition. After this period, the
first clock pulse is generated.
t
HD;STA
4.0 - 0.6 - µs
LOW period of the SCL clock t
LOW
4.7 - 1.3 - µs
HIGH period of the SCL clock t
HIGH
4.0 - 0.6 - µs
Set-up time for a repeated START
condition
t
SU;STA
4.7 - 0.6 - µs
Data set-up time t
SU;DAT
250 - 100 - ns
Rise time of both SDA and SCL
signals
t
r
- 1000 20+0.1C
b
(1)
300 ns
Fall time of both SDA and SCL
signals
t
f
- 300 20+0.1C
b
(1)
300 ns
Set-up time for STOP condition t
SU;STO
4.0 - 0.6 - µs
Bus free time between a STOP
and START condition
t
BUF
4.7 - 1.3 - µs
Capacitive load for each bus line C
b
0 400 - 400 pF
Noise margin at the LOW level for
each connected device (including
hysteresis)
V
nL
0.1V
DD
- 0.1V
DD
- V
Noise margin at the HIGH level for
each connected device (including
hysteresis)
V
nH
0.2V
DD
- 0.2V
DD
- V
Table 14: Two Wire Serial Interface - Characteristics of the SDA and SCL bus lines
Notes
(1): C
b
= total capacitance of one bus line in pF.