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PCA9848: 8-channel ultra-low voltage, Fm+ I2C-bus switch with reset

The PCA9848 is an ultra-low voltage, octal bidirectional translating switch controlled via the I²C-bus. The SCL/SDA upstream pair fans out to eight downstream pairs, or channels. Any or all SCx/SDx channels can be selected, determined by the programmable control register. This feature allows multiple devices with the same I²C-bus address to reside on the same bus. The switch device can also separate a heavily loaded I²C-bus into separate bus segments, eliminating the need for a bus buffer.

An active LOW reset input allows the PCA9848 to recover from a situation where one of the downstream I²C-buses is stuck in a LOW state. Pulling the RESET pin LOW resets the I²C-bus state machine and deselects all the channels, as does the internal Power-On Reset (POR) function.

The pass gates of the switches are constructed such that the VDD1 pin is used to limit the maximum high voltage which is passed by the PCA9848. This allows the use of different bus voltages on each channel, so that 0.8 V, 1.8 V, 2.5 V or 3.3 V parts can communicate without any additional protection. External pull-up resistors pull the bus up to the desired voltage level for each channel. All I/O pins are 3.6 V tolerant.

Outline 3d SOT355-1

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Ordering Information

Package Information

Product ID	Package Description	Outline Version	Reflow/Wave Soldering	Packing	Product Status	Part NumberOrdering code(12NC)	Marking	Chemical Content	RoHS / Pb Free / RHF	LeadFree Conversion Date	MSL	MSL LF
PCA9848PW		SOT355-1	SSOP-TSSOP-VSO-WAVE	Reel 13" Q1/T1 in SmallPack	Development	PCA9848PWZ (9353 042 07138)	Standard Marking	PCA9848PW		Always Pb-free	1	1
				Reel 13" Q1/T1	Active	PCA9848PWJ (9353 042 07118)	Standard Marking	PCA9848PW		Always Pb-free	1	1