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NXP Semiconductors PCA9543APW,118
- Part No.:
- PCA9543APW,118
- Manufacturer:
- NXP Semiconductors
- Category:
- Specialized
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
PCA9543APW,118.pdf
- Description:
- IC INTERFACE SPECIALIZED 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:22,989
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Product details
Overview
PCA9543APW,118 from NXP Semiconductors is a 2-channel bidirectional I²C-bus switch with integrated interrupt logic and active-low reset. It enables selective routing of SCL/SDA signals to two downstream SCx/SDx channels, supports voltage translation between 1.8 V, 2.5 V, 3.3 V, and 5 V buses, and features 5 V-tolerant I/O pins. It is used in multi-sensor systems where isolated I²C bus segmentation and fault recovery are required.
For engineers reviewing the PCA9543APW,118 datasheet, PCA9543APW,118 pinout, PCA9543APW,118 application, or PCA9543APW,118 equivalent, key selection criteria include channel-selectable I²C isolation, dual interrupt input handling (INT0/INT1), active-low reset for bus fault recovery, and compatibility with standard-mode (100 kHz) and fast-mode (400 kHz) I²C operation.
Technical Context
The PCA9543APW,118 implements a register-controlled switch matrix that routes upstream SCL/SDA to either or both downstream SC0/SD0 and SC1/SD1 pairs. Channel selection is performed via an 8-bit I²C-accessible control register where bits B0–B1 determine enabled channels, and INT0/INT1 status bits reflect real-time interrupt inputs.
Its pass-gate architecture uses VDD as a voltage clamp reference, enabling level translation without external components. The device includes internal power-on reset and external active-low RESET pin, both forcing all channels deselected and clearing the control register. All I/O pins are 5 V tolerant, and the switch exhibits low ON-resistance (5–30 Ω depending on VDD).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 2 independent bidirectional I²C switch channels (SC0/SD0 and SC1/SD1) |
| I²C Speed Support | Up to 400 kHz - compatible with Fast-mode I²C timing requirements |
| VDD Range | 2.3 V to 5.5 V - supports wide supply flexibility across mixed-voltage systems |
| ON-Resistance (Ron) | 5 Ω (typ) at VDD = 3.0–3.6 V - ensures minimal signal degradation and bus rise-time impact |
| Interrupt Logic | Dual active-low inputs (INT0, INT1) with open-drain active-low output (INT) - provides hardware-level interrupt aggregation |
| Reset Function | Active-low RESET pin + internal POR - recovers stuck-bus conditions and forces safe default state (all channels deselected) |
| Voltage Translation | Supports 1.8 V ↔ 5 V translation via VDD-clamped pass gates - eliminates need for external level shifters |
Pinout & Package
TSSOP14 package (SOT402-1), 14-lead plastic thin shrink small outline, body width 4.4 mm, lead pitch 0.65 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Hardware address bit 0 | Configures 7-bit slave address LSB; pulled HIGH/LOW to select one of four base addresses (E0h–E7h) |
| A1 | Hardware address bit 1 | Configures 7-bit slave address MSB; combined with A0 enables up to 4 devices on same I²C bus |
| RESET | Active-low reset input | Forces control register clear and all channels deselected; minimum pulse width 4 ns |
| INT0 | Active-low interrupt input 0 | Monitors interrupt status from downstream channel 0 devices; readable in control register bit 4 |
| SD0 | Serial data 0 | Downstream I²C data line for channel 0; bidirectional, 5 V tolerant |
| SC0 | Serial clock 0 | Downstream I²C clock line for channel 0; bidirectional, 5 V tolerant |
| VSS | Ground reference | Supply return for logic and switch circuitry; must be connected to system ground |
| INT1 | Active-low interrupt input 1 | Monitors interrupt status from downstream channel 1 devices; readable in control register bit 5 |
| SD1 | Serial data 1 | Downstream I²C data line for channel 1; bidirectional, 5 V tolerant |
| SC1 | Serial clock 1 | Downstream I²C clock line for channel 1; bidirectional, 5 V tolerant |
| INT | Active-low interrupt output | Open-drain AND of INT0 and INT1; asserts LOW when either input is active |
| SCL | Upstream serial clock | Main I²C bus clock input; 5 V tolerant, drives internal logic and switch control |
| SDA | Upstream serial data | Main I²C bus data input/output; 5 V tolerant, interfaces with master and control register |
| VDD | Supply voltage | Power rail (2.3–5.5 V); sets maximum pass-gate output voltage (Vo(sw)) for level translation |
Key Features
| Feature | Design Value |
|---|---|
| Programmable channel selection | Any combination of channels (0 only, 1 only, both) enabled via I²C write to control register; no glitch on activation |
| Integrated interrupt aggregation | Two dedicated interrupt inputs feed a single open-drain output (INT), simplifying master-side interrupt polling |
| Voltage-level translation | VDD-defined clamping enables interoperability between 1.8 V, 2.5 V, 3.3 V, and 5 V I²C segments without external components |
| Robust bus fault recovery | Active-low RESET pin and internal POR ensure deterministic recovery from stuck-bus states and power-up defaults |
| Low-power standby operation | Standby current as low as 0.2 µA (typ) at VDD = 3.6 V - suitable for battery-backed or energy-sensitive systems |
Applications
| Multi-Sensor Industrial Monitoring | Server Baseboard Management (BMC) |
|---|---|
Use Scenario: Multiple temperature, humidity, and voltage monitoring ICs share a single I²C bus on an industrial PLC backplane, requiring electrical isolation and independent interrupt reporting. IC Role / Device Role / Timing Role: PCA9543APW,118 acts as a configurable I²C channel isolator and interrupt aggregator, enabling the host MCU to poll sensors per channel and respond to alerts without bus contention. Use Value: Prevents cross-talk between sensor subsystems, reduces software polling overhead via hardware interrupt prioritization, and supports mixed-voltage sensor integration (e.g., 3.3 V ADCs with 5 V EEPROMs). |
Use Scenario: A server motherboard uses multiple I²C peripherals (fan controllers, VRMs, DIMM SPDs) connected to the BMC, requiring hot-plug-safe bus segmentation and fault containment. IC Role / Device Role / Timing Role: PCA9543APW,118 serves as a managed I²C multiplexer with reset-driven bus recovery, allowing the BMC to isolate faulty peripherals without resetting the entire bus. Use Value: Enables hot insertion of add-in cards, prevents cascading bus lockups, and allows firmware to identify and quarantine malfunctioning devices using INT0/INT1 status bits. |
| Automotive Body Control Module | Embedded Test Equipment |
Use Scenario: A vehicle BCM integrates door lock actuators, mirror position sensors, and ambient light sensors on separate I²C sub-buses, each requiring independent power domain management and EMI isolation. IC Role / Device Role / Timing Role: PCA9543APW,118 functions as a voltage-translating I²C switch, decoupling 5 V actuator drivers from 3.3 V microcontrollers while preserving timing integrity. Use Value: Eliminates need for discrete level shifters, reduces BOM count, and maintains I²C timing compliance (tLOW/tHIGH) across domains via low Ron and controlled capacitance. |
Use Scenario: Automated test equipment connects diverse DUTs (EEPROMs, PMICs, RTCs) with varying I²C voltage levels and interrupt behaviors to a single controller interface. IC Role / Device Role / Timing Role: PCA9543APW,118 operates as a reconfigurable I²C bus router with interrupt-aware channel selection, enabling dynamic test sequencing and failure root-cause analysis. Use Value: Reduces test fixture complexity by supporting mixed-voltage DUTs on one controller port, accelerates debug via interrupt source identification, and improves test repeatability with deterministic reset behavior. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar I²C bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PCA9544APW,118 | 4-channel version with identical pinout, same VDD range and interrupt logic, but adds two extra SCx/SDx pairs and one additional INTn input | Required when >2 downstream I²C segments must be managed; higher channel count increases bus capacitance loading | Select PCA9544APW,118 only if 4-channel routing is needed; otherwise PCA9543APW,118 offers lower cost and smaller footprint |
| TCA9544APWR | TI's functionally equivalent 4-channel I²C switch; shares same control register map and interrupt behavior but uses different slave address scheme (0x70–0x77) | Used in TI-based designs or where NXP supply continuity is constrained; requires firmware address update | Choose TCA9544APWR for TI ecosystem alignment or second-source assurance; verify address conflict resolution in multi-device systems |
Compared with PCA9544APW,118, the PCA9543APW,118 reduces PCB area and component cost for 2-channel use cases, while compared with TCA9544APWR, it ensures native NXP firmware compatibility and avoids address-mapping changes in existing I²C initialization code.
Availability
PCA9543APW,118 is available at Aetrix Electronics and suitable for industrial automation, server BMC, and automotive body control applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for PCA9543APW,118 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in interface and power management ICs.
The PCA9543A/43B belongs to NXP's I²C-bus switch and multiplexer family, designed specifically to solve bus contention, voltage mismatch, and interrupt aggregation challenges in complex embedded systems with multiple I²C peripherals.
FAQ
What is the primary function of the PCA9543APW,118 in an I²C system?
The PCA9543APW,118 functions as a programmable 2-channel bidirectional I²C-bus switch that isolates and routes upstream SCL/SDA signals to downstream SC0/SD0 and SC1/SD1 segments. It enables selective communication with peripherals on separate buses, supports voltage translation, and provides hardware-level interrupt aggregation - all critical for managing complex I²C topologies without software overhead. The PCA9543APW,118 ensures deterministic channel enablement after STOP condition and maintains signal integrity via low Ron pass gates.
How does the PCA9543APW,118 handle voltage level translation between different I²C buses?
The PCA9543APW,118 uses its VDD supply voltage to clamp the maximum output voltage (Vo(sw)) of its pass-gate switches. When VDD is set to 3.3 V, Vo(sw) is limited to ~1.9–2.8 V, allowing safe interfacing between a 5 V upstream bus and 3.3 V or 2.5 V downstream peripherals. External pull-up resistors on each SCx/SDx pair set the final bus voltage level. This architecture eliminates external level shifters while maintaining I²C timing compliance. The PCA9543APW,118 achieves this without altering signal timing or adding propagation delay beyond 0.3 ns.
Can the PCA9543APW,118 be used with both Standard-mode (100 kHz) and Fast-mode (400 kHz) I²C clocks?
Yes, the PCA9543APW,118 fully supports both Standard-mode (up to 100 kHz) and Fast-mode (up to 400 kHz) I²C operation. Its dynamic characteristics specify tLOW/tHIGH minima of 1.3 µs and 0.6 µs respectively under Fast-mode conditions, and propagation delay is limited to 0.3 ns. The device's low input/output capacitance (≤10 pF on SDA/SCL, ≤5 pF on SCx/SDx) and 5 V-tolerant I/O ensure robust signal integrity across both speeds. The PCA9543APW,118 maintains these specs across its full operating temperature range (−40 °C to +85 °C).
What happens to the PCA9543APW,118 channels during power-up or reset?
On power-up, the PCA9543APW,118 performs an internal Power-On Reset (POR) that initializes the control register to 0x00, deselecting all channels (B0 = B1 = 0). Asserting the active-low RESET pin also clears the register and disables all channels. Both events force SC0/SD0 and SC1/SD1 into high-impedance states, preventing unintended bus activity. The PCA9543APW,118 guarantees this safe default state before any I²C transaction occurs, eliminating startup glitches and ensuring predictable system initialization.
How are interrupts from downstream devices handled by the PCA9543APW,118?
The PCA9543APW,118 provides two active-low interrupt inputs (INT0, INT1), one per downstream channel, and a single open-drain interrupt output (INT) that asserts LOW when either input is active. Bits 4 and 5 of the control register reflect real-time INT0/INT1 states, allowing the host to read which channel triggered the interrupt. The PCA9543APW,118 does not mask or filter interrupts - it passes status directly, enabling firmware to selectively enable channels and interrogate devices. Unused INTn pins must be pulled to VDD.
PCA9543APW,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- 2-Channel I2C Multiplexer
- Interface:
- I2C
- Voltage - Supply:
- 2.3V ~ 3.6V, 4.5V ~ 5.5V
- Supplier Device Package:
- 14-TSSOP
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
PCA9543APW,118 FAQ
1.How can I place an order for PCA9543APW,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9543APW,118 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for PCA9543APW,118 reliable?
The price and inventory of PCA9543APW,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9543APW,118 is usually 5 days.
3.What payment methods are accepted for PCA9543APW,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9543APW,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9543APW,118?
PCA9543APW,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9543APW,118 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for PCA9543APW,118?
For technical support, including PCA9543APW,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9543APW,118 requirements.
6.How does Aetrix verify that PCA9543APW,118 is sourced from the original manufacturer or authorized distributors?
All PCA9543APW,118 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that PCA9543APW,118 meets industry standards.
7.What is the process for return or replacement of PCA9543APW,118?
All PCA9543APW,118 units undergo pre-shipment inspection (PSI). If there is an issue with PCA9543APW,118, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The PCA9543APW,118 part is unused and in its original packaging.
Return procedure for PCA9543APW,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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