PCA9545APW

4-channel I2C switch with interrupt logic and reset

Generaldescription ThePCA9545Aisaquadbi-directionaltranslatingswitchcontrolledviatheI2C-bus.TheSCL/SDAupstreampairfansouttofourdownstreampairs,orchannels.AnyindividualSCx/SDxchannelorcombinationofchannelscanbeselected,determinedbythecontentsoftheprogramma

PCA9545APW

4-channel I2C-bus switch with interrupt logic and reset; 1-of-4 bidirectional translating switches\nI2C-bus interface logic; compatible with SMBus standards\n4 active LOW interrupt inputs\nActive LOW interrupt output\nActive LOW reset input\n2 address pins allowing up to 4 devices on the I2C-bus\nAlternate address versions A, B and C allow up to a total of 12 devices on the bus for larger systems or to resolve address conflicts\nChannel selection via I2C-bus, in any combination\nPower-up with all switch channels deselected\nLow Ron switches\nAllows voltage level translation between 1.8 V, 2.5 V, 3.3?V and 5?V buses\nNo glitch on power-up\nSupports hot insertion\nLow standby current\nOperating power supply voltage range of 2.3?V to 5.5?V\n5 V tolerant Inputs\n0 Hz to 400 kHz clock frequency\nESD protection exceeds 2000 V HBM per JESD22?A114 and 1000 V CDM per JESD22?C101\nLatch-up protection exceeds 100 mA per JESD78\nThree packages offered: SO20, TSSOP20, and HVQFN20\n;

The PCA9545A/45B/45C is a quad bidirectional translating switch controlled via theI2C-bus. The SCL/SDA upstream pair fans out to four downstream pairs, or channels. Anyindividual SCx/SDx channel or combination of channels can be selected, determined bythe contents of the programmable control register. Four interrupt inputs, INT0 to INT3, onefor each of the downstream pairs, are provided. One interrupt output, INT, acts as an ANDof the four interrupt inputs.\nAn active LOW reset input allows the PCA9545A/45B/45C to recover from a situationwhere one of the downstream I2C-buses is stuck in a LOW state. Pulling the RESET pinLOW resets the I2C-bus state machine and causes all the channels to be deselected asdoes the internal power-on reset function.\nThe pass gates of the switches are constructed such that the VDD pin can be used to limitthe maximum high voltage which is passed by the PCA9545A/45B/45C. This allows theuse of different bus voltages on each pair, so that 1.8 V or 2.5 V or 3.3 V parts cancommunicate with 5 V parts without any additional protection. External pull-up resistorspull the bus up to the desired voltage level for each channel. All I/O pins are 5 V tolerant.\nThe PCA9545A, PCA9545B and PCA9545C are identical except for the fixed portion ofthe slave address.\n

PCA9545APW

4-CHANNEL I2C AND SMBus SWITCH WITH INTERRUPT LOGIC AND RESET FUNCTIONS

PCA9545APW

Interrupt Logic and Reset Functions

PCA9545APW

Package：20-TSSOP（0.173"，4.40mm 寬）；包裝：卷帶（TR）剪切帶（CT）Digi-Reel? 得捷定制卷帶 類別：集成電路（IC） 專用 描述：IC INTERFACE SPECIALIZED 20TSSOP

PCA9545APWE4

4-CHANNEL I2C AND SMBus SWITCH WITH INTERRUPT LOGIC AND RESET FUNCTIONS

PCA9545APWE4

Interrupt Logic and Reset Functions

PCA9545APWR

4-CHANNEL I2C AND SMBus SWITCH WITH INTERRUPT LOGIC AND RESET FUNCTIONS

PCA9545APWR

Interrupt Logic and Reset Functions

PCA9545APWRE4

4-CHANNEL I2C AND SMBus SWITCH WITH INTERRUPT LOGIC AND RESET FUNCTIONS