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Power-On Reset

Voltage Translation

V

(V)

CC

2

1

1.5

4.5

3.5

2.5

5

4

3

2

2.5

3

3.5

4

4.5

5

5.5

Typical

Maximum

Minimum

I

=

100

A

SWout

-

m

Bus Transactions

Writes

PCA9548A

WITH RESET

SCPS143C – OCTOBER 2006 – REVISED JUNE 2007

to the operating voltage for a power-reset cycle.

pass-gate transistors (note that the graph was generated using the data specified in the Electrical

Characteristics section of this data sheet).

Figure 6. Pass-Gate Voltage vs Supply Voltage at Three Process Points

bus voltage. For example, if the main bus is running at 5 V and the downstream buses are 3.3 V and 2.7 V,

voltage can be set to 3.3 V. Pullup resistors then can be used to bring the bus voltages to their appropriate

levels (see Figure 11).

Data is exchanged between the master and PCA9548A through write and read commands.

Data is transmitted to the PCA9548A by sending the device address and setting the least-significant bit (LSB) to

a logic 0 (see Figure 4 for device address). The command byte is sent after the address and determines which

SCn/SDn channel receives the data that follows the command byte (see Figure 7). There is no limitation on the

number of data bytes sent in one write transmission.

8

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