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Part: PCA9540PWDH
Category:
Interface and Interconnect
-> I2C
Description: 2-channel I2c Multiplexer
Company: Philips Semiconductors
Datasheet: Download PCA9540PWDH datasheet File size : 2565 kB
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Datasheet text preview:
INTEGRATED CIRCUITS
PCA9540 2-channel I2C multiplexer
Product specification 1999 Dec 15
Philips Semiconductors
Philips Semiconductors
Product specification
2-channel I2C multiplexer
PCA9540
FEATURES
· 1-of-2 bi-directional translating multiplexer · Channel selection via I2C bus · Operating supply voltage 2.5 to 3.6 V · Operating temperature range 0°C to 70°C · Power-up with all multiplexer channels deselected · Low on resistance
DESCRIPTION
The PCA9540 is a 1-of-2 bi-directional translating multiplexer, controlled via the I2C bus. The SCL/SDA upstream pair fans out to two SCx/SDx downstream pairs, or channels. Only one SCx/SDx channel is selected at a time, determined by the contents of the programmable control register. The pass gates of the multiplexer are constructed such that the VDD pin can be used to limit the maximum high voltage which will be passed by the PCA9540. This allows the use of different bus voltages on each SCx/SDx pair, so that 3.3 V parts can communicate with 5 V parts without any additional protection. External pull-up resistors can pull the bus up to the desired voltage level for this channel.
PIN CONFIGURATION
SCL SDA VDD SD0
1 2 3 4
8 7 6 5
SC1 SD1 V SS SC0
SW00491
PIN DESCRIPTION
PIN NUMBER 1 2 3 4 5 6 7 8 SYMBOL SCL SDA VDD SD0 SC0 VSS SD1 SC1 FUNCTION Serial clock line Serial data line Supply voltage Serial data 0 Serial clock 0 Supply ground Serial data 1 Serial clock 1
ORDERING INFORMATION
PACKAGES 8-Pin Plastic SO 8-Pin Plastic TSSOP TEMPERATURE RANGE 0°C to +70°C 0°C to +70°C ORDER CODE PCA9540D PCA9540PW DH DRAWING NUMBER SOT96-1 SOT505-1
1999 Dec 15
2
8532185 22852
Philips Semiconductors
Product specification
2-channel I2C multiplexer
PCA9540
BLOCK DIAGRAM
SC0
SC1
SD0
SD1
V SS
VDD
Power-on Reset
SCL Input Filter SDA I2C-Bus Control
SW00492
1999 Dec 15
3
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