PCA9521DP 데이터 시트보기 (PDF) - NXP Semiconductors.
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PCA9521DP Datasheet PDF : 23 Pages
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NXP Semiconductors
PCA9521
Fast dual bidirectional bus buffer
5V
3.3 V
R1
1.5 kΩ
VCC
SCL
SDA
BUS MASTER
U1
R2
1.5 kΩ
R3
1.1 kΩ
VCC
SA1
SA2
SB1
SB2
PCA9521
EN
U2
R4
1.1 kΩ
VDD
SCL
SC0
SDA
SD0
SC1
INT[3:0] SD1
SC2
A0
SD2
A1
SC3
Using the PCA9521,
up to 400 pF may be
connected to each
and every bus 0
through bus 3.
A2
SD3
PCA9544A
U3
002aaf291
Alternately, using the PCA9546A (which allows multiple outputs to be selected) you would simply
place a PCA9521 on each output on the right-hand side, rather than a single PCA9521 on the
left-hand side
Fig 14. PCA9521 multiplexer isolation application
5V
R1
1.5 kΩ
SCL
SDA
VCC
A
Y0
B
Y1
C
Y2
3-to-8
demultiplexer
Y3
74LS137 Y4
Y5
Y6
Y7
U1
R2
1.5 kΩ
VCC
SA1
SA2
SB1
SB2
PCA9521
EN
U2
5V
multiple isolated buses with
400 pF load capacitance each
VCC
SA1
SA2
SB1
SB2
PCA9521
EN
U3
002aaf292
Fig 15. PCA9521 bus multiplexer application driven from a simple logic device
PCA9521
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 19 March 2013
© NXP B.V. 2013. All rights reserved.
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