Datasheet

Bosch Sensortec | BME680 Datasheet
39 | 50
Modifications reserved |Data subject not change without notice | Printed in Germany
Document number: BST-BME680-DS001-00 Revision_1.0_072017
6.4.2 I²C timings
For I²C timings, the following abbreviations are used:
 “S&F mode” = standard and fast mode
 “HS mode” = high speed mode
 C
b
= bus capacitance on SDA line
All other naming refers to I²C specification 2.1 (January 2000).
The I²C timing diagram is in Picture 9. The corresponding values are given in Table 18
t
HDDAT
t
f
t
BUF
SDI
SCK
SDI
t
LOW
t
HDSTA
t
r
t
SUSTA
t
HIGH
t
SUDAT
t
SUSTO
Picture 9: I
2
C timing diagram
Table 18: I
2
C timings
Parameter
Symbol
Condition
Min
Typ
Max
Unit
SDI setup time
t
SU;DAT
S&F Mode
HS mode
160
30
ns
ns
SDI hold time
t
HD;DAT
S&F Mode, C
b
≤100 pF
S&F Mode, C
b
≤400 pF
HS mode, C
b
≤100 pF
HS mode, C
b
≤400 pF
80
90
18
24
115
150
ns
ns
ns
ns
SCK low pulse
t
LOW
HS mode, C
b
≤100 pF
V
DDIO
= 1.62 V
160
ns
SCK low pulse
t
LOW
HS mode, C
b
≤100 pF
V
DDIO
= 1.2 V
210
ns
The above-mentioned I
2
C specific timings correspond to the following internal added delays:
 Input delay between SDI and SCK inputs: SDI is more delayed than SCK by typically 100 ns in Standard and Fast
Modes and by typically 20 ns in High Speed Mode.
 Output delay from SCK falling edge to SDI output propagation is typically 140 ns in Standard and Fast Modes and
typically 70 ns in High Speed Mode.