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PCA9543A/43B: 2-channel I²C-bus switch with interrupt logic and reset

The PCA9543A/43B is a bidirectional translating switch, controlled by the I²C-bus. The SCL/SDA upstream pair fans out to two downstream pairs, or channels. Any individual SCx/SDx channels or combination of channels can be selected, determined by the contents of the programmable control register. Two interrupt inputs, INT0 and INT1, one for each of the downstream pairs, are provided. One interrupt output, INT, which acts as an AND of the two interrupt inputs, is provided.

An active LOW reset input allows the PCA9543X 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 causes all the channels to be deselected, as does the internal power-on reset function.

The pass gates of the switches are constructed such that the VDD pin can be used to limit the maximum high voltage which will be passed by the PCA9543X. This allows the use of different bus voltages on each SCx/SDx pair, so that 1.8 V, 2.5 V, or 3.3 V parts can communicate with 5 V parts 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 5 V tolerant.

The PCA9543A and PCA9543B are identical except for the fixed portion of the slave address.

PCA9543A_43B: Product Block Diagram

sot108-1_3d

Data Sheets (1)

Application Notes (2)

Users Guides (3)

Brochures (3)

Package Information (2)

Packing (2)

Supporting Information (3)

Design Support

• Expert mode sample code for PCA9543A (REV 1.0) TXT PCA9543A_1 12/10/2014

IBIS Model

• PCA9543A IBIS model (REV 1.0) ZIP PCA9543A 9/2/2014

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	EFR	IFR(FIT)	MTBF(hour)	MSL	MSL LF
PCA9543BPW		SOT402-1	SSOP-TSSOP-VSO-WAVE	Reel 13" Q1/T1	Active	PCA9543BPW,118 (9352 833 05118)	PA9543B	PCA9543BPW		Always Pb-free	0.0	2.0	5E8	1	1
PCA9543AD		SOT108-1	SO-SOJ-REFLOW SO-SOJ-WAVE SO-SOJ-REFLOW SO-SOJ-WAVE	Reel 13" Q1/T1	Active	PCA9543AD,118 (9352 758 03118)	PCA9543A	PCA9543AD		week 13, 2005	0.0	2.0	5E8	1	1
				Bulk Pack	Active	PCA9543AD,112 (9352 758 03112)	PCA9543A	PCA9543AD		week 13, 2005	0.0	2.0	5E8	1	1
PCA9543APW		SOT402-1	SSOP-TSSOP-VSO-WAVE	Reel 13" Q1/T1	Active	PCA9543APW,118 (9352 758 04118)	PA9543A	PCA9543APW		week 13, 2005	0.0	2.0	5E8	1	1
				Bulk Pack	Active	PCA9543APW,112 (9352 758 04112)	PA9543A	PCA9543APW		week 13, 2005	0.0	2.0	5E8	1	1