參數(shù)資料
型號: PCA9506
廠商: NXP Semiconductors N.V.
英文描述: 40-bit I2C-bus I/O port with RESET, OE, and INT
中文描述: 40位I2C總線的I / O端口復位,光電,和INT
文件頁數(shù): 22/30頁
文件大?。?/td> 145K
代理商: PCA9506
9397 750 14939
Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Product data sheet
Rev. 01 — 14 February 2006
22 of 30
Philips Semiconductors
PCA9506
40-bit I
2
C-bus I/O port with RESET, OE, and INT
[5]
The maximum t
f
for the SDA and SCL bus lines is specified at 300 ns. The maximum fall time for the SDA output stage t
f
is specified 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 specified t
f
.
C
b
= total capacitance of one bus line in pF.
Input filters on the SDA and SCL inputs suppress noise spikes less than 50 ns.
[6]
[7]
Fig 16. Definition of timing on the I
2
C-bus
t
SP
t
BUF
t
HD;STA
P
P
S
t
LOW
t
r
t
HD;DAT
t
f
t
HIGH
t
SU;DAT
t
SU;STA
Sr
t
HD;STA
t
SU;STO
SDA
SCL
002aaa986
Rise and fall times refer to V
IL
and V
IH
.
Fig 17. I
2
C-bus timing diagram
SCL
SDA
t
HD;STA
t
SU;DAT
t
HD;DAT
t
f
t
BUF
t
SU;STA
t
LOW
t
HIGH
t
VD;ACK
002aab175
t
SU;STO
protocol
START
condition
(S)
bit 7
MSB
(A7)
bit 6
(A6)
bit 0
(R/W)
acknowledge
(A)
STOP
condition
(P)
1
/f
SCL
t
r
t
VD;DAT
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