pca9646 NXP Semiconductors, pca9646 Datasheet - Page 11

• Manufacturer Part Number: pca9646
• Description: Pca9646 Buffered 4-channel 2-wire Bus Switch
• Manufacturer: NXP Semiconductors

NXP Semiconductors
PCA9646
Product data sheet
Fig 14. PCA9646 typical buffer application
Fig 15. PCA9646 as a 30 mA line driver
400 pF load at 1 MHz
or 4 nF load at 100 kHz
U1
e.g., PC/TV
receiver or
decoder box
U3
MASTER
BUS MASTER
BUS
V
DD
3.3 V
V
SDA
SCL
DD
400 pF load at 1 MHz
or 4 nF load at 100 kHz
400 pF load at 1 MHz
or 4 nF load at 100 kHz
SDA
SCL
SC2
SD2
SC3
SD3
address
R1
etc.
U4
MASTER/
SLAVE
R2
U2
SCL
SDA
RESET
A0
A1
A2
PCA9646
All information provided in this document is subject to legal disclaimers.
V
DD
R1
1.1 kΩ
R3
1.1 kΩ
R5
1.1 kΩ
SC0
SC1
SC2
SC3
SD0
SD1
SD2
SD3
Rev. 1 — 1 March 2011
R2
1.1 kΩ
R4
1.1 kΩ
R6
1.1 kΩ
pull-up current
long cable run
backplane or
with 30 mA
180 Ω
R3
U1
SCL
SDA
RESET
SC2
SD2
SC3
SD3
A0
A1
A2
V
SS
address
PCA9646
R4
180 Ω
V
DD
U3
SCL
SDA
RESET
A0
A1
A2
SC0
SD0
SC1
SD1
PCA9646
V
Buffered 4-channel 2-wire bus switch
DD
R7
1.1 kΩ
R9
1.1 kΩ
U5
U7
SC0
SC1
SC2
SC3
SD0
SD1
SD2
SD3
400 pF load at 1 MHz
or 4 nF load at 100 kHz
400 pF load at 1 MHz
or 4 nF load at 100 kHz
SLAVE
SLAVE
R5
R8
1.1 kΩ
R10
1.1 kΩ
U6
U8
SLAVE
SLAVE
R6
flat TV, LED array
U4
SCL
SDA
e.g., monitor,
PCA9646
© NXP B.V. 2011. All rights reserved.
SLAVE
V
5 V
SC0
SD0
SC1
SD1
DD
002aaf376
002aaf375
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