PCA9538 查看數據表（PDF） - Philips Electronics
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PCA9538 Datasheet PDF : 18 Pages
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Philips Semiconductors
8-bit I2C and SMBus low power I/O port
with interrupt and reset
Product data sheet
PCA9538
AC SPECIFICATIONS
SYMBOL
PARAMETER
fSCL
Operating frequency
tBUF
Bus free time between STOP and START conditions
tHD;STA Hold time after (repeated) START condition
tSU;STA Repeated START condition setup time
tSU;STO Setup time for STOP condition
tHD;DAT
tVD;ACK
tVD;DAT
Data in hold time
Valid time for ACK condition2
Data out valid time3
tSU;DAT Data setup time
tLOW
Clock LOW period
tHIGH Clock HIGH period
tF
Clock/Data fall time
tR
Clock/Data rise time
tSP
Pulse width of spikes that must be suppressed by the input filters
Port Timing
tPV
Output data valid
tPS
Input data setup time
tPH
Input data hold time
Interrupt Timing
tIV
tIR
RESET
Interrupt valid
Interrupt reset
tW
tREC
tRESET
Reset pulse width
Reset recovery time
Time to reset
NOTES:
1. Cb = total capacitance of one bus line in pF.
2. tVD;ACK = time for Acknowledgement signal from SCL low to SDA (out) low.
3. tVD;DAT = minimum time for SDA data out to be valid following SCL low.
STANDARD MODE
I2C-bus
MIN
MAX
0
100
4.7
—
4.0
—
4.7
—
4.0
—
0
—
0.3
3.45
300
—
250
—
4.7
—
4.0
—
—
300
—
1000
—
50
FAST MODE
I2C-bus
MIN
MAX
0
400
1.3
—
0.6
—
0.6
—
0.6
—
0
—
0.1
0.9
50
—
100
—
1.3
—
0.6
—
20 + 0.1 Cb1
300
20 + 0.1 Cb1
300
—
50
—
200
—
200
100
—
100
—
1
—
1
—
—
4
—
4
—
4
—
4
4
—
4
—
0
—
0
—
400
—
400
—
UNITS
kHz
µs
µs
µs
µs
ns
µs
ns
ns
µs
µs
ns
ns
ns
ns
ns
µs
µs
µs
ns
ns
ns
SDA
tBUF
tLOW
tR
tF
SCL
P
tHD;STA
S
tHD;DAT
tHIGH
tSU;DAT
tHD;STA
tSU;STA
Sr
Figure 13. Definition of timing
tSP
tSU;STO
P
SU00645
2004 Oct 05
11
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