PCA9551 Philips Semiconductors, PCA9551 Datasheet - Page 13

• Manufacturer Part Number: PCA9551
• Description: 8-bit I2C LED driver with programmable blink rates
• Manufacturer: Philips Semiconductors

1. C
2. t
3. t
4. Resetting the device while actively communicating on the bus may cause glitches or errant STOP conditions.
5. Upon reset, the full delay will be the sum of t
Philips Semiconductors
AC SPECIFICATIONS
NOTES:
2004 Oct 01
Port Timing
Reset
8-bit I
t
t
SYMBOL
VD;DAT
VD;DAT
t
VD;ACK
VD;DAT
RESET
t
t
t
b
t
t
t
VD;ACK
HD;STA
SU;STA
SU;STO
HD;DAT
SU;DAT
t
t
t
f
t
= total capacitance of one bus line in pF.
HIGH
LOW
SCL
BUF
t
t
t
t
REC
t
t
SP
PV
PS
PH
t
W
F
R
4,5
(H)
(L)
= minimum time for SDA data out to be valid following SCL LOW.
= time for Acknowledgement signal from SCL LOW to SDA (out) LOW.
2
C LED driver with programmable blink rates
Operating frequency
Bus free time between STOP and START conditions
Hold time after (repeated) START condition
Repeated START condition set-up time
Set-up time for STOP condition
Data in hold time
Valid time for ACK condition
Data out valid time
Data out valid time
Data set-up time
Clock LOW period
Clock HIGH period
Clock/Data fall time
Clock/Data rise time
Pulse width of spikes that must be suppressed by the
input filters
Output data valid
Input data set-up time
Input data hold time
Reset pulse width
Reset recovery time
Time to reset
3
3
PARAMETER
RESET
2
and the RC time constant of the SDA bus.
13
STANDARD MODE
MIN
250
100
400
4.7
4.0
4.7
4.0
4.7
4.0
—
—
—
—
—
—
—
0
0
1
6
0
I
2
C-BUS
MAX
1500
1000
100
600
600
300
200
50
—
—
—
—
—
—
—
—
—
—
—
—
—
20 + 0.1 C
20 + 0.1 C
MIN
100
100
400
1.3
0.6
0.6
0.6
1.3
0.6
—
—
—
—
—
FAST MODE
0
0
1
6
0
I
2
C-BUS
b
b
1
1
MAX
400
600
600
600
300
300
200
—
—
—
—
—
—
—
—
50
—
—
—
—
—
PCA9551
Product data sheet
UNITS
kHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
s
s
s
s
s
s
s