Torwards
AT8563
Quartz crystal parameters(fOSC=32.768kHz)
serial resistance
RS
CL
−
−
2
8
−
10
−
40
−
kΩ
parallel load capacitance
pF
Version B
Version C
10
12
CT
pF
trimmer capacitance
−
CLKOUT output
[1]
CLKOUT duty factor
I2 C-bus timing characteristics[2]
50
δCLKOUT
−
−
−
%
[3]
SCL clock frequency
fSCL
400
kHz
−
−
START condition hold time
tHD;STA
0.6
0.6
−
μs
set-up time for a repeated
START condition
tSU:STA
−
−
μs
SCL LOW time
tLOW
tHIGH
tr
1.3
0.6
−
−
−
−
−
−
−
−
−
−
−
−
μs
μs
μs
μs
pF
ns
ns
μs
ns
SCL HIGH time
SCL and SDA rise time
SCL and SDA fall time
capacitive bus line load
data set-up time
0.3
0.3
400
−
tf
−
Cb
−
tSU;DAT
tH D;DAT
tSU:STO
tSW
100
0
data hold time
−
set-up time for STOP condition
tolerable spike width on bus
4.0
−
−
50
[1] Unspecified for fCLKOUT = 32.768 kHz.
[2] All timing values are valid within the operating supply voltage range at Tamb and referenced to VIL and
VIH with an input voltage swing of VSS to VDD
.
[3] I2C -bus access time between two STARTs or between a START and a STOP condition to this device
must be less than one second.
Fig 18 I2C -bus timing waveforms.
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18
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