PCA9551 Philips Semiconductors, PCA9551 Datasheet - Page 15

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

Philips Semiconductors
2004 Oct 01
8-bit I
PROTOCOL
SCL
SDA
SDA
RESET
SCL
LEDx
SDA
SCL
2
C LED driver with programmable blink rates
P
50%
t
SU;STA
t
t
BUF
BUF
CONDITION
START
(S)
S
t HD;STA
t
REC
START
Figure 20. I
t
HD;STA
30%
t
LOW
t
LOW
r t
BIT 7
MSB
(A7)
2
t HIGH
C-bus timing diagram; rise and fall times refer to V
t
t
R
HD;DAT
Figure 18. Definition of RESET timing
Figure 19. Definition of timing
t
t
f
SU;DAT
1 / f SCL
BIT 6
t
(A6)
HIGH
t
HD;DAT
t
F
15
t
SU;DAT
BIT 7
(D1)
t
VD;DAT
Sr
50%
t
SU;STA
BIT 8
(D0)
t
ACK OR READ CYCLE
HD;STA
IL
t
W
t
t
and V
RESET
RESET
t
50%
VD;ACK
IH
ACKNOWLEDGE
50%
t
SP
(A)
t
SU;STO
LED OFF
t
SU;STO
PCA9551
Product data sheet
CONDITION
SW02310
SU00645
STOP
P
(P)
SW02333