Datasheet

Seite 7
Ausgabe 08/2008 Technische Änderungen v orbehalten! HYGROSENS INSTRUMENTS GmbH Postf ach 1054 D-79839 Löf f ingen Tel: [phone] Fax: [phone]
SERIAL DIGITAL INTERFACE
t
I2C_R
t
I2C_F
SCL
t
I2C_SU_STA
t
I2C_HD_STA
t
I2C_SU_DAT
t
I2C_HD_DAT
SDA
t
I2C_H
t
I2C_L
SCL
t
I2C_SU_STO
t
I2C_HD_STA
SDA
t
I2C_BF
Fig. 5: Timing I
2
C protocol
Nr. Parameter Symbol min typ max Unit
1 SCL Clock frequency f
SCL
400 kHz
2 Bus free time betw. start and stop
condition
t
I2C_BF
1.3
µs
3 Hold time start condition t
I2C_HD_STA
0.6
µs
4 Setup time repeated start
condition
t
I2C_SU_STA
0.6
µs
5 Low period SCL/SDA t
I2C_L
1.3
µs
6 High period SCL/SDA t
I2C_H
0.6
µs
7 Data hold time t
I2C_HD_DAT
0
µs
8 Data setup time t
I2C_SU_DAT
0.1
µs
9 Rise time SCL/SDA t
I2C_R
0.3
µs
10 Fall time SCL/SDA t
I2C_F
0.3
µs
11 Setup time stop condition t
I2C_SU_STO
0.6
µs
12 Noise interception SDA,
Spikes are suppressed
t
I2C_NI
50 ns
Table 1 Timing I
2
C protocol