PCA9553 Philips Semiconductors, PCA9553 Datasheet - Page 14

• Manufacturer Part Number: PCA9553
• Description: 4-bit I2C LED driver with programmable blink rates
• Manufacturer: Philips Semiconductors

Philips Semiconductors
2004 Oct 01
4-bit I
PROTOCOL
SDA
SCL
SDA
SCL
2
C LED driver with programmable blink rates
P
t
SU;STA
t
t
BUF
BUF
CONDITION
START
(S)
S
t HD;STA
Figure 19. I
t
HD;STA
t
LOW
t
LOW
DEFINITIONS
R
C
R
GENERATOR
L
L
T
r t
PULSE
= Load resistor FOR LEDN. R
= Load capacitance includes jig and probe capacitance
= Termination resistance should be equal to the output
BIT 7
MSB
(A7)
(3 mA or less current).
impedance Z
2
t HIGH
C-bus timing diagram; rise and fall times refer to V
t
t
R
HD;DAT
Figure 20. Test circuitry for switching times
Figure 18. Definition of timing
t
t
V
f
SU;DAT
I
O
1 / f SCL
R
of the pulse generators.
T
BIT 6
t
(A6)
HIGH
D.U.T.
t
HD;DAT
V
t
F
DD
14
L
t
SU;DAT
FOR SDA AND SCL > 1 k
V
O
R
L
= 500
BIT 7
(D1)
t
C
50 pF
VD;DAT
Sr
L
t
SU;STA
BIT 8
(D0)
t
HD;STA
IL
Open
SW02334
V
DD
and V
t
VD;ACK
IH
ACKNOWLEDGE
t
SP
(A)
t
SU;STO
t
SU;STO
PCA9553
Product data sheet
CONDITION
SU00645
STOP
P
(P)
SW02333