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| PCA9553 Datasheet, PDF (17/26 Pages) NXP Semiconductors – 4-bit I2C LED driver with programmable blink rates | |||
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NXP Semiconductors
PCA9553
4-bit I2C-bus LED driver with programmable blink rates
SDA
tBUF
SCL
tr
tLOW
tHD;STA
P
S
tHD;DAT
tf
tHIGH
tSU;DAT
Fig 20. Deï¬nition of timing
tHD;STA
tSP
tSU;STA
Sr
tSU;STO
P
002aaa986
protocol
START
condition
(S)
bit 7
MSB
(A7)
bit 6
(A6)
SCL
SDA
tSU;STA
tBUF
tLOW tHIGH
1 / fSCL
tr
tf
bit 1
(D1)
bit 0
(D0)
acknowledge
(A)
STOP
condition
(P)
tHD;STA
tSU;DAT tHD;DAT
Rise and fall times refer to VIL and VIH.
Fig 21. I2C-bus timing diagram
tVD;DAT
tVD;ACK
tSU;STO
002aab285
13. Test information
PCA9553_6
Product data sheet
PULSE
GENERATOR
VDD
VI
VO
DUT
RT
RL
500 â¦
VDD
open
VSS
CL
50 pF
002aab880
RL = load resistor for LEDn. RL for SDA and SCL > 1 k⦠(3 mA or less current).
CL = load capacitance includes jig and probe capacitance.
RT = termination resistance should be equal to the output impedance Zo of the pulse generators.
Fig 22. Test circuitry for switching times
Rev. 06 â 29 December 2008
© NXP B.V. 2008. All rights reserved.
17 of 26
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