PCA9543APWR ,Two-Channel I2C-Bus Switch With Interrupt Logic and Reset 14-TSSOP -40 to 85 SCPS169A–SEPTEMBER 2007–REVISED JUNE 20146 Pin Configuration and FunctionsD PACKAGE(TOP VIEW)PW PA ..
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PCA9543PW ,2-channel I2C switch with interrupt logic and reset
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PCA9544 ,4-channel I2C multiplexer with interrupt logic
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PCA9543ADR-PCA9543APWR
2-channel I2C switch with interrupt logic and reset
PCA9543A
SlavesA
SDASCL
INT
INT0
RESET
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PCA9543ASCPS169A–SEPTEMBER 2007–REVISED JUNE 2014
PCA9543A 2-ChannelI2C Bus Switch With Interrupt Logic and Reset Features 2 Applications 1-of-2 Bidirectional Translating Switches • ServersI2C Bus and SMBus Compatible • Routers (Telecom Switching Equipment) Two Active-Low Interrupt Inputs • Factory Automation Active-Low Interrupt Output • Products WithI2C Slave Address Conflicts (e.g.
Multiple, Identical Temp Sensors)• Active-Low Reset Input Two Address Pins Allowingupto Four PCA9543A
3 DescriptionDeviceson theI2C Bus The PCA9543Aisa dual bidirectional translating• Channel Selection ViaI2C Bus,in Any switch controlled by theI2C bus. The SCL/SDACombination upstream pair fans outto two downstream pairs,or• Power-up WithAll Switch Channels Deselected channels. Either individual SCn/SDn channelor both
channels can be selected, determined by the• Low RON Switches contentsof the programmable control register. Two• Allows Voltage-Level Translation Between interrupt inputs (INT1–INT0), one for each of the1.8-V, 2.5-V, 3.3-V, and 5-V Buses downstream pairs, are provided. One interrupt output• No Glitchon Power-up (INT) actsasan ANDof the two interrupt inputs. Supports Hot Insertion An active-low reset (RESET) input allows the• Low Standby Current PCA9543Ato recover froma situation where oneof
the downstreamI2C busesis stuckina low state.• Operating Power-Supply Voltage Rangeof 2.3V Pulling RESET low resets theI2C state machine andto 5.5V causes bothof the channelsto be deselected, as• 5.5-V Tolerant Inputs does the internal power-on reset function.• 0to 400-kHz Clock Frequency The pass gatesof the switches are constructed such• Latch-Up Performance Exceeds 100-mA Per that the VCC pin can be usedto limit the maximumJESD78 high voltage, which willbe passedby the PCA9543A. ESD Protection Exceeds JESD22 This allows the useof different bus voltages on each
pair, so that 1.8-V, 2.5-V, or 3.3-V parts can– 2000-V Human-Body Model (A114-A) communicate with 5-V parts without any additional– 1000-V Charged-Device Model (C101) protection. External pull-up resistors pull the bus up the desired voltage level for each channel. All I/O
pins are 5.5-V tolerant.
Device Information(1)(1) Forall available packages, see the orderable addendumat
the endofthe datasheet.
Diagram
