AK8975 Datasheet, PDF (10/34 Pages) Asahi Kasei Microsystems – 3-axis Electronic Compass

[AK8975/C]
5.3.5. I²C Bus Interface
CSB pin = “H”
I²C bus interface is compliant with Standard mode and Fast mode. Standard/Fast mode is selected
automatically by fSCL.
(1) Standard mode
fSCL≤100kHz
1.65V≤Vid≤Vdd
Symbol
Parameter
fSCL
SCL clock frequency
tHIGH SCL clock "High" time
tLOW SCL clock "Low" time
tR
SDA and SCL rise time
tF
SDA and SCL fall time
tHD:STA Start Condition hold time
tSU:STA Start Condition setup time
tHD:DAT SDA hold time (vs. SCL falling edge)
tSU:DAT SDA setup time (vs. SCL rising edge)
tSU:STO Stop Condition setup time
tBUF
Bus free time
Min.
4.0
4.7
4.0
4.7
0
250
4.0
4.7
Typ.
Max.
100
1.0
0.3
Unit
kHz
μs
μs
μs
μs
μs
μs
μs
ns
μs
μs
(2) Fast mode
100kHz<fSCL≤400kHz
1.65V≤Vid≤Vdd
Symbol
Parameter
fSCL SCL clock frequency
tHIGH SCL clock "High" time
tLOW SCL clock "Low" time
tR
SDA and SCL rise time
tF
SDA and SCL fall time
tHD:STA Start Condition hold time
tSU:STA Start Condition setup time
tHD:DAT SDA hold time (vs. SCL falling edge)
tSU:DAT SDA setup time (vs. SCL rising edge)
tSU:STO Stop Condition setup time
tBUF Bus free time
tSP
Noise suppression pulse width
[I²C bus interface timing]
1/fSCL
SCL
Min.
0.6
1.3
0.6
0.6
0
100
0.6
1.3
Typ.
Max.
Unit
400
kHz
μs
μs
0.3
μs
0.3
μs
μs
μs
μs
ns
μs
μs
50
ns
VIH3
VIL3
SDA
tBUF
tLOW tR
tHIGH tF
SCL
tHD:STA
Stop Start
tHD:DAT
tSU:DAT tSU:STA
Start
VIH3
VIL3
tSP
VIH3
VIL3
tSU:STO
Stop


MS1187-E-02
- 10 -
2010/05