pca9551bs3 NXP Semiconductors, pca9551bs3 Datasheet - Page 15

• Manufacturer Part Number: pca9551bs3
• Description: 8-bit I2c Led Driver With Programmable Blink Rates
• Manufacturer: NXP Semiconductors

NXP Semiconductors
11. Dynamic characteristics
Table 13.
[1]
[2]
[3]
[4]
[5]
PCA9551_7
Product data sheet
Symbol
f
t
t
t
t
t
t
t
t
t
t
t
t
t
Port timing
t
t
t
Reset
t
t
t
SCL
BUF
HD;STA
SU;STA
SU;STO
HD;DAT
VD;ACK
VD;DAT
SU;DAT
LOW
HIGH
r
f
SP
v(Q)
su(D)
h(D)
w(rst)
rec(rst)
rst
t
t
C
Resetting the device while actively communicating on the bus may cause glitches or errant STOP conditions.
Upon reset, the full delay will be the sum of t
VD;ACK
VD;DAT
b
= total capacitance of one bus line in pF.
= minimum time for SDA data output to be valid following SCL LOW.
= time for Acknowledgement signal from SCL LOW to SDA (out) LOW.
Dynamic characteristics
Parameter
SCL clock frequency
bus free time between a STOP and
START condition
hold time (repeated) START condition
set-up time for a repeated START
condition
set-up time for STOP condition
data hold time
data valid acknowledge time
data valid time
data set-up time
LOW period of the SCL clock
HIGH period of the SCL clock
rise time of both SDA and SCL signals
fall time of both SDA and SCL signals
pulse width of spikes that must be
suppressed by the input filter
data output valid time
data input setup time
data input hold time
reset pulse width
reset recovery time
reset time
rst
and the RC time constant of the SDA bus.
Rev. 07 — 23 February 2007
Conditions
LOW-level
HIGH-level
8-bit I
2
C-bus LED driver with programmable blink rates
[4][5]
[1]
[2]
[2]
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
1500
1000
Max
100
600
600
300
200
50
-
-
-
-
-
-
-
-
-
-
-
-
-
20 + 0.1C
20 + 0.1C
Fast-mode I
Min
100
100
400
1.3
0.6
0.6
0.6
1.3
0.6
0
0
1
6
0
-
-
-
-
-
PCA9551
b
b
© NXP B.V. 2007. All rights reserved.
[3]
[3]
2
C-bus
Max
400
600
600
600
300
300
200
50
-
-
-
-
-
-
-
-
-
-
-
-
-
15 of 26
Unit
kHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
s
s
s
s
s
s
s