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| PCA9551D-T Datasheet, PDF (17/26 Pages) NXP Semiconductors – 8-bit I2C-bus LED driver with programmable blink rates | |||
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NXP Semiconductors
PCA9551
8-bit I2C-bus LED driver with programmable blink rates
protocol
START
condition
(S)
bit 7
MSB
(A7)
bit 6
(A6)
SCL
SDA
tSU;STA
tBUF
tLOW tHIGH
1/fSCL
tr
tf
bit 0 acknowledge
(R/W)
(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
002aab175
12. Test information
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
PCA9551_8
Product data sheet
Rev. 08 â 31 July 2008
© NXP B.V. 2008. All rights reserved.
17 of 26
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