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NXP Semiconductors PCA9575PW1,118
- Part No.:
- PCA9575PW1,118
- Manufacturer:
- NXP Semiconductors
- Category:
- I/O Expanders
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
PCA9575PW1,118.pdf
- Description:
- IC XPND 400KHZ I2C SMBUS 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,203
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Product details
Overview
PCA9575PW1,118 from NXP Semiconductors is a 16-bit I²C/SMBus GPIO expander with dual independent I/O voltage rails (1.1 V to 3.6 V), active-low reset, open-drain interrupt output, and bus-hold/pull-up/pull-down programmability-designed for low-voltage mobile and multi-rail embedded systems such as clamshell phones and sensor interface modules.
For engineers reviewing the PCA9575PW1,118 datasheet, PCA9575PW1,118 pinout, PCA9575PW1,118 application, or PCA9575PW1,118 equivalent, this device delivers level-translating I/O expansion in TSSOP24 packaging with verified 400 kHz I²C operation, <2 μA standby current, and power-on default-to-input behavior critical for battery-powered system initialization and voltage-domain bridging.
Technical Context
The PCA9575PW1,118 implements two independent 8-bit I/O banks (P0_0–P0_7 and P1_0–P1_7), each with dedicated VDD(IO) supply pins enabling simultaneous operation at different logic levels (e.g., 1.8 V core ↔ 3.3 V peripheral). Its register map includes configuration, polarity inversion, bus-hold enable, pull-up/pull-down selection, and interrupt mask registers-all accessible via standard I²C write/read sequences.
It supports Auto-Increment mode for sequential register access, features a fixed 7-bit I²C address (0x20) specific to the TSSOP24 variant, and uses an internal Power-On Reset plus external active-low RESET pin to initialize all I/Os as inputs with default register states-including pull-up resistors enabled and interrupt masking active.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| I²C Speed | 400 kHz maximum-enables fast host communication without requiring high-speed controller support |
| Supply Range | 1.1 V to 3.6 V core (VDD); 1.1 V to 3.6 V per I/O bank (VDD(IO)0/VDD(IO)1)-supports mixed-voltage system interconnect |
| Standby Current | <2 μA at VDD = 1.8 V-minimizes battery drain during sleep in portable devices |
| I/O Configuration | 16 individually configurable pins (8 per bank), defaulting to high-impedance input at power-up-ensures safe startup before firmware initialization |
| Interrupt Output | Open-drain INT pin, active LOW-allows wired-AND connection to shared MCU interrupt lines with external pull-up |
| ESD Rating | 6000 V HBM, 1000 V CDM-meets industrial handling and board-level robustness requirements |
| Operating Temp | −40 °C to +85 °C-qualified for industrial and consumer mobile environments |
Pinout & Package
TSSOP24 package (SOT355-1), 4.4 mm body width, 0.65 mm lead pitch, exposed pad not present-compatible with standard surface-mount reflow profiles and automated optical inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Core logic supply | 1.1 V–3.6 V digital core voltage; powers I²C interface, registers, and control logic |
| VDD(IO)0 | I/O bank 0 supply | Independent 1.1 V–3.6 V rail for P0_0–P0_7-enables level translation between core and peripheral domains |
| VDD(IO)1 | I/O bank 1 supply | Independent 1.1 V–3.6 V rail for P1_0–P1_7-allows asymmetric voltage operation across both banks |
| RESET | Active-low hardware reset | Asynchronous reset that forces all I/Os to input mode and reloads default register values |
| INT | Open-drain interrupt output | Asserts LOW on unmasked input state change-requires external pull-up; supports interrupt coalescing |
| SCL / SDA | I²C serial interface | Standard-mode (100 kHz) and fast-mode (400 kHz) compatible; bidirectional, slew-rate controlled |
| P0_0–P0_7 | Bank 0 I/O ports | Configurable as input/output with bus-hold, pull-up/pull-down, and polarity inversion per pin |
| P1_0–P1_7 | Bank 1 I/O ports | Functionally identical to Bank 0 but electrically isolated by separate VDD(IO)1 supply |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent I/O voltage rails | Enables reliable interfacing between 1.2 V SoCs and 3.3 V sensors/peripherals without external level shifters |
| Programmable bus-hold or 100 kΩ pull-up/pull-down | Eliminates need for external biasing components while preventing floating inputs in un-driven states |
| Power-on default to input mode | Guarantees high-impedance I/O state at startup-prevents contention or unintended drive on shared buses |
| GPIO All Call command | Allows synchronized register writes across multiple PCA9575PW1,118 devices sharing same I²C bus segment |
| Interrupt mask per I/O pin | Reduces spurious interrupts by selectively disabling edge detection on non-critical inputs (e.g., status LEDs) |
Applications
| Clamshell Mobile Devices | Sensor Interface Modules |
|---|---|
|
Use Scenario: Folding phone hinge detects open/closed state and routes I/O signals across moving flex cable. IC Role / Device Role / Timing Role: PCA9575PW1,118 acts as voltage-translating I/O bridge between 1.1 V application processor and 2.8 V display/backlight ICs. Use Value: Eliminates discrete level shifters and reduces BOM count while maintaining ESD robustness and low standby current. |
Use Scenario: Industrial environmental sensor node aggregates temperature, humidity, and motion data using mixed-voltage peripherals. IC Role / Device Role / Timing Role: PCA9575PW1,118 provides 16 configurable GPIOs with independent VDD(IO)0/VDD(IO)1 rails to interface 1.8 V MCU with 3.3 V analog front-end and digital sensors. Use Value: Enables single-chip I/O expansion across three voltage domains without signal integrity degradation or timing skew. |
| Medical Wearables | Industrial PLC I/O Expansion |
|
Use Scenario: Compact ECG patch monitors electrode contact quality and button presses under strict power budget constraints. IC Role / Device Role / Timing Role: PCA9575PW1,118 serves as ultra-low-power GPIO expander with <2 μA standby current and active-low RESET for safe boot sequencing. Use Value: Extends battery life beyond 7 days while supporting real-time interrupt-driven event capture from biopotential electrodes. |
Use Scenario: DIN-rail mounted PLC adds discrete I/O capability to legacy 24 V fieldbus systems using modern low-voltage controllers. IC Role / Device Role / Timing Role: PCA9575PW1,118 interfaces 3.3 V microcontroller with opto-isolated 24 V input modules and solid-state relay drivers via level-translating I/O banks. Use Value: Reduces isolation component count by enabling direct 3.3 V logic compatibility with industrial-grade input conditioning circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar GPIO expansion applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PCA9539PW,118 | 16-bit I²C GPIO with identical TSSOP24 package but no VDD(IO) separation-single 2.3–5.5 V I/O supply only | Lacks level translation; requires all peripherals to share same I/O voltage domain | Select when system uses uniform 3.3 V or 5 V I/O and cost sensitivity outweighs voltage flexibility |
| TCA6424APWR | 24-bit I²C GPIO in TSSOP24; supports 1.65–5.5 V VDD and 1.65–5.5 V VDDIO-wider voltage range but no bus-hold feature | Higher pin count and broader voltage tolerance, but lacks bus-hold for weakly driven inputs | Prefer when >16 GPIOs are needed and external pull-ups are acceptable; verify interrupt latency requirements |
Compared with PCA9575PW1,118, PCA9539PW,118 sacrifices voltage domain isolation for lower unit cost, while TCA6424APWR trades bus-hold reliability for higher channel count and extended voltage range-making PCA9575PW1,118 optimal for constrained, multi-rail mobile designs where pin-level controllability and ultra-low quiescent current are decisive.
Availability
PCA9575PW1,118 is available at Aetrix Electronics and suitable for battery-operated mobile gadgets, industrial control interfaces, and medical wearables requiring stable component supply across long production lifecycles.
Supply support for PCA9575PW1,118 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 mixed-signal interface ICs and embedded processing.
The PCA9575 product line was developed to extend NXP's I²C GPIO portfolio with enhanced low-voltage operation, dual-rail level translation, and reduced power consumption-targeting space-constrained, battery-sensitive mobile and industrial edge devices.
FAQ
What is the I²C address of PCA9575PW1,118?
The PCA9575PW1,118 has a fixed 7-bit I²C target address of 0x20 (0100000b), as defined in its datasheet Figure 6. This address is hard-coded for the TSSOP24 package variant and cannot be altered via address pins-unlike the 28-pin PCA9575PW2 which supports 16 configurable addresses. The R/W bit is appended externally during communication.
Does PCA9575PW1,118 support true level translation between different I/O voltages?
Yes, PCA9575PW1,118 supports true bidirectional level translation: its VDD(IO)0 and VDD(IO)1 pins allow independent supply of each 8-bit I/O bank at any voltage from 1.1 V to 3.6 V, while the core logic (VDD) operates separately in the same range. This enables simultaneous interfacing-for example-of a 1.2 V processor with 3.3 V sensors without external translators.
How does the RESET pin function on PCA9575PW1,118?
The RESET pin on PCA9575PW1,118 is an active-low asynchronous input that forces all 16 I/Os into high-impedance input mode, clears output latches, resets configuration and polarity registers to their power-on defaults, and restarts the internal state machine-regardless of I²C activity. It ensures deterministic recovery after fault conditions or brown-out events.
Can PCA9575PW1,118 drive LEDs directly?
No, PCA9575PW1,118 cannot directly drive standard LEDs: its output drive strength is limited to 1 mA source / 3 mA sink per pin, insufficient for typical LED forward currents (5–20 mA). It can, however, control LED driver transistors or low-current indicator LEDs (<1 mA) with appropriate current-limiting resistors and verified voltage compatibility.
What happens to the I/O pins when VDD is powered off but VDD(IO)0 remains active?
When VDD is off but VDD(IO)0 is active, the PCA9575PW1,118 holds its I/O banks in their last configured state (input/output direction and output logic level) as defined in the datasheet Section 1 General Description. This "I/O retention" behavior prevents floating outputs and maintains signal integrity during partial power-down sequences common in mobile power management.
PCA9575PW1,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Number of I/O:
- 16
- Interface:
- I2C, SMBus
- Interrupt Output:
- Yes
- Features:
- POR
- Output Type:
- Push-Pull
- Current - Output Source/Sink:
- 1mA, 3mA
- Clock Frequency:
- 400 kHz
- Voltage - Supply:
- 1.1V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
PCA9575PW1,118 FAQ
1.How can I place an order for PCA9575PW1,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9575PW1,118 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 PCA9575PW1,118 reliable?
The price and inventory of PCA9575PW1,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9575PW1,118 is usually 5 days.
3.What payment methods are accepted for PCA9575PW1,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9575PW1,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9575PW1,118?
PCA9575PW1,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9575PW1,118 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 PCA9575PW1,118?
For technical support, including PCA9575PW1,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9575PW1,118 requirements.
6.How does Aetrix verify that PCA9575PW1,118 is sourced from the original manufacturer or authorized distributors?
All PCA9575PW1,118 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 PCA9575PW1,118 meets industry standards.
7.What is the process for return or replacement of PCA9575PW1,118?
All PCA9575PW1,118 units undergo pre-shipment inspection (PSI). If there is an issue with PCA9575PW1,118, 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 PCA9575PW1,118 part is unused and in its original packaging.
Return procedure for PCA9575PW1,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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