PCA9548A www.ti.com SCPS143G – JUNE 2009 – REVISED MARCH 2021 SCPS143G – JUNE 2009 – REVISED MARCH 2021 PCA9548A Low Voltage 8-Channel I C Switch with Reset2 eight downstream pairs, or channels. Any individual
the I C bus hangs up. The switches MASTER PCA reset to no channels selected. 9548 Device 3 Device 4 Interrupt logic inputs and output are available on the PCA9543 and PCA9545 and provide a flag to the Device 5 master for system monitoring. The PCA9546 is a lower RESET Device 6 cost version of the PCA9545 without Interrupt Logic. The PCA9548 provides eight channels and are more Device 7 convenient to use then dual 4 channel devices since the Device
not happen. 2 The PCA9548 uses I C commands to activate and deactivate the downstream channels. The channel does not shift until the STOP command is sent by the master and the switch acts only as a wire and does not regenerate
not happen. 2 The PCA9548 uses I C commands to activate and deactivate the downstream channels. The channel does not shift until the STOP command is sent by the master and the switch acts only as a wire and does not regenerate
6.1 Device address
Following a START condition, the bus master must output the address of the slave it is accessing. The address of the PCA9548A is shown in Figure 5. To conserve power, no internal pull-up resistors are incorporated
OpenDrain MCU R SCL SCL FF OpenDrain Fig6.2(d) Using GPIO-ports Case5: Using I2C bus switch IC. Ex. PCA9545(4ch) , PCA9548(8ch) (multiple D6T sensors) 5V VCC R R D6T SDA SDA 0 SCL SCL 0 GND SDA 1 I2C bus switch SCL 1 : VDD SDA 2 VCC SCL 2 R R R R D6T MCU SDA SDA x SDA SCL SCL x SCL GND GND Fig6.2(e) Using
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