NXP Semiconductors
PCA9633
4-bit Fm+ I 2 C-bus LED driver
[5]
[6]
[7]
A master device must internally provide a hold time of at least 300 ns for the SDA signal (refer to the V IL of the SCL signal) in order to
bridge the unde?ned region of SCL’s falling edge.
The maximum t f for the SDA and SCL bus lines is speci?ed at 300 ns. The maximum fall time (t f ) for the SDA output stage is speci?ed at
250 ns. This allows series protection resistors to be connected between the SDA and the SCL pins and the SDA/SCL bus lines without
exceeding the maximum speci?ed t f .
Input ?lters on the SDA and SCL inputs suppress noise spikes less than 50 ns.
SDA
t BUF
t r
t f
t HD;STA
t SP
t LOW
SCL
t HD;STA
t SU;STA
t SU;STO
P
S
t HD;DAT
t HIGH
t SU;DAT
Sr
P
002aaa986
Fig 23. De?nition of timing
protocol
START
condition
(S)
bit 7
MSB
(A7)
bit 6
(A6)
bit 1
(D1)
bit 0
(D0)
acknowledge
(A)
STOP
condition
(P)
t SU;STA
t LOW
t H IG H
1 / f SCL
SCL
SDA
t BUF
t r
t f
t HD;STA
t SU;DAT
t HD;DAT
t VD;DAT
t VD;ACK
t SU;STO
002aab285
Rise and fall times refer to V IL and V IH .
Fig 24. I 2 C-bus timing diagram
PCA9633_5
? NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 05 — 25 July 2008
30 of 43
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