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PCA9545APWR Datasheet(PDF) 1 Page - Texas Instruments |
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PCA9545APWR Datasheet(HTML) 1 Page - Texas Instruments |
1 / 37 page SCL PCA9545A Slaves A , A ...A 0 1 N Slaves B 0 1 N , B ...B Slaves C 0 1 N , C ...C Slaves D 0 1 N , D ...D I2C or SMBus Master (e.g. µProcessor) SDA INT SD0 SC0 INT0 Channel 0 Channel 1 Channel 2 Channel 3 RESET SD1 SC1 INT1 SD2 SC2 INT2 SD3 SC3 INT3 VCC A0 A1 GND Product Folder Sample & Buy Technical Documents Tools & Software Support & Community PCA9545A SCPS147D – OCTOBER 2005 – REVISED JUNE 2014 PCA9545A Low Voltage 4-channel I2C and SMbus Switch With Interrupt Logic and Reset Functions 1 Features 2 Applications 1 • 1-of-4 Bidirectional Translating Switches • Servers • I2C Bus and SMBus Compatible • Routers (Telecom Switching Equipment) • Four Active-Low Interrupt Inputs • Factory Automation • Active-Low Interrupt Output • Products With I2C Slave Address Conflicts (e.g. Multiple, Identical Temp Sensors) • Active-Low Reset Input • Two Address Terminals, Allowing up to Four 3 Description Devices on the I2C Bus The PCA9545A is a quad bidirectional translating • Channel Selection via I2C Bus, in Any switch controlled via the I2C bus. The SCL/SDA Combination upstream pair fans out to four downstream pairs, or • Power-Up With All Switch Channels Deselected channels. Any individual SCn/SDn channel or combination of channels can be selected, determined • Low RON Switches by the contents of the programmable control register. • Allows Voltage-Level Translation Between 1.8-V, Four interrupt inputs (INT3–INT0), one for each of the 2.5-V, 3.3-V, and 5-V Buses downstream pairs, are provided. One interrupt (INT) • No Glitch on Power-Up output acts as an AND of the four interrupt inputs. • Supports Hot Insertion An active-low reset (RESET) input allows the • Low Standby Current PCA9545A to recover from a situation in which one of the downstream I2C buses is stuck in a low state. • Operating Power-Supply Voltage Range of Pulling RESET low resets the I2C state machine and 2.3 V to 5.5 V causes all the channels to be deselected, as does the • 5.5 V Tolerant Inputs internal power-on reset function. • 0 to 400-kHz Clock Frequency The pass gates of the switches are constructed such • Latch-Up Performance Exceeds 100 mA per that the VCC terminal can be used to limit the JESD 78 maximum high voltage, which will be passed by the • ESD Protection Exceeds JESD 22 PCA9545A. This allows the use of different bus voltages on each pair, so that 1.8-V, 2.5-V, or 3.3-V – 2000-V Human-Body Model (A114-A) parts can communicate with 5-V parts, without any – 1000-V Charged-Device Model (C101) additional protection. External pull-up resistors pull the bus up to the desired voltage level for each channel. All I/O terminals are 5.5 V tolerant. Device Information(1) PART NUMBER PACKAGE BODY SIZE (NOM) PCA9545A TSSOP (20) 6.50 mm x 4.40 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. 4 Simplified Application Diagram 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. |
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