PCA9531 Philips Semiconductors (Acquired by NXP), PCA9531 Datasheet - Page 15

• Manufacturer Part Number: PCA9531
• Description: 8-bit I2C Led Dimmerthe PCA9531 is an 8-bit i C And Smbus I/o Expander Optimized For Dimming Leds in 256 Discrete Steps For Red/green/blue (RGB) Color Mixing And Back Light Applications. The PCA9531 Contains an Internal Oscillator With Two User Progr
• Manufacturer: Philips Semiconductors (Acquired by NXP)

Philips Semiconductors
2003 Nov 10
8-bit I
handbook, full pagewidth
PROTOCOL
SDA
SCL
2
C LED dimmer
t
SU;STA
t
BUF
CONDITION
START
(S)
t HD;STA
Figure 20. I
GENERATOR
t
PULSE
LOW
r t
2
BIT 7
MSB
C-bus timing diagram; rise and fall times refer to V
(A7)
Figure 21. Test circuitry for switching times
t HIGH
V
I
DEFINITIONS
R
C
R
t
R
T
t
L
L
SU;DAT
T
f
= Load resistor.
= Load capacitance includes jig and probe capacitance
= Termination resistance should be equal to the output
1 / f SCL
BIT 6
(A6)
impedance Z
D.U.T.
V
DD
15
t
HD;DAT
V
O
O
of the pulse generators.
C
50Pf
L
(R/W)
BIT 8
R
t
L
VD;DAT
= 500 Ω
ACKNOWLEDGE
IL
(A)
Open
V
and V
DD
IH
t
VD;ACK
CONDITION
STOP
(S)
PCA9531
SW02142
Product data
t
SW02143
SU;STO