MB90945 Datasheet, PDF (55/68 Pages) Fujitsu Component Limited. – 16-bit Proprietary Microcontroller

MB90945 Series
(8) I²C Timing
Parameter
(TA = −40 °C to +105 °C, VCC = 3.5V to 5.5V, VSS = AVSS = 0.0 V)
Standard-mode
Symbol Condition
Min Max
Fast-mode^*4
Min Max
Unit
SCL clock frequency
fSCL
0
100
0
400 kHz
Hold time (repeated) START condition
SDA ↓ → SCL ↓
tHDSTA
4.0
⎯
0.6
⎯ µs
“L” width of SCL clock
tLOW
4.7
⎯
1.3
⎯ µs
“H” width of SCL clock
tHIGH
4.0
⎯
0.6
⎯ µs
Set-up time for a repeated START condition
SCL ↑ → SDA ↓
tSUSTA
R = 1.3 kΩ,
4.7
⎯
0.6
Data hold time
SCL ↑ → SDA ↓↑
tHDDAT ^{C = 50 pF*1}
0
3.45*²
0
⎯ µs
0.9*³ µs
Data set-up time
SDA ↓↑ → SCL ↑
tSUDAT
250
⎯
100
⎯ ns
Set-up time for STOP condition
SCL ↑ → SDA ↑
tSUSTO
4.0
⎯
0.6
⎯ µs
Bus free time between STOP and START
condition
tBUS
4.7
⎯
1.3
⎯ µs
*1 : R, C : Pull-up resistor and load capacitor of the SCL and SDA lines.
*2 : The maximum tHDDAT only has to be met if the devie does not stretch the “L” width (tLOW) of the SCL signal.
*3 : A Fast-mode I²C-bus device can be used in a Standard-mode I²C-bus system, but the requirement
tSUDAT ≥ 250 ns must then be met.
*4 : For use at over 100 kHz, set the machine clock to at least 6 MHz.
• I²C Timing
SDA
tLOW
tSUDAT
SCL
tHDSTA
tHDDAT
tHIGH
tSUSTA
tHDSTA
tBUS
tSUSTO
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