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NXP Semiconductors PCA9500PW,112
- Part No.:
- PCA9500PW,112
- Manufacturer:
- NXP Semiconductors
- Category:
- I/O Expanders
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
PCA9500PW,112.pdf
- Description:
- IC XPND 400KHZ I2C SMBUS 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,506
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Product details
Overview
PCA9500PW,112 from NXP Semiconductors is an 8-bit I²C/SMBus I/O expander with integrated 2-kbit (256 × 8) EEPROM, designed for board-level status monitoring and configuration storage in multi-card systems. It operates from 2.5 V to 3.6 V, supports up to 400 kHz I²C clock, features 5 V-tolerant I/Os, and includes three hardware address pins enabling up to eight devices on one bus.
For engineers reviewing the PCA9500PW,112 datasheet, PCA9500PW,112 pinout, PCA9500PW,112 application, or PCA9500PW,112 equivalent, key selection considerations include its dual-device I²C addressing (GPIO at 0x20–0x27, EEPROM at 0xA0–0xA7), hot-insertion support, quasi-bidirectional I/O architecture, and EEPROM write-protection via WC pin.
Technical Context
The PCA9500PW,112 implements two independent I²C slave interfaces: one for the 8-bit GPIO port (fixed base address 0x20) and one for the 256-word EEPROM (fixed base address 0xA0), both configurable via A0–A2 pins. Its quasi-bidirectional I/Os power up as inputs with internal pull-ups and require no direction control register.
EEPROM operations support byte and 4-byte page writes with self-timed cycles (5 ms max), while I/O read/write uses standard I²C protocol with acknowledge after each byte. Noise filtering on SCL/SDA and internal power-on reset ensure robust operation in noisy telecom and industrial backplane environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Interface | I²C-bus and SMBus compatible, 0 Hz to 400 kHz clock frequency |
| I/O Count | 8 quasi-bidirectional pins (IO0–IO7), independently configurable as input or output |
| EEPROM Size | 2-kbit (256 × 8), with 100,000 write cycles and 10-year data retention |
| Supply Voltage | 2.5 V to 3.6 V operating range; 5 V tolerant I/O pins enable mixed-voltage system interfacing |
| Addressing | Three hardware address pins (A0–A2) allow up to eight PCA9500PW,112 devices on one bus |
| Package | TSSOP16 (SOT403-1), 4.4 mm body width, lead pitch 0.65 mm, RoHS-compliant |
| Operating Temp | −40 °C to +85 °C ambient temperature range for industrial-grade reliability |
Pinout & Package
TSSOP16 package (SOT403-1): 16-pin thin shrink small outline, 4.4 mm body width, 0.65 mm lead pitch, exposed pad not present (unlike HVQFN). Requires standard reflow profile per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Hardware address input | LSB of 3-bit device address; internal pull-up enables default high state when unconnected |
| A1 | Hardware address input | Mid-bit of 3-bit device address; sets unique I²C address within 0x20–0x27 (GPIO) and 0xA0–0xA7 (EEPROM) |
| A2 | Hardware address input | MSB of 3-bit device address; allows up to eight PCA9500PW,112 units on same I²C bus without software remapping |
| IO0–IO7 | Quasi-bidirectional I/O | Configurable as input or output without direction register; power-up as inputs with weak pull-up; 25 mA max sink per pin |
| WC | Write control | Active-low EEPROM write enable; held HIGH to protect stored data (e.g., board ID, firmware version) from accidental overwrite |
| SCL | I²C serial clock | Input-only clock line; includes noise filter to suppress spikes ≤50 ns; supports 400 kHz fast-mode timing |
| SDA | I²C serial data | Open-drain bidirectional line; 5 V tolerant; requires external pull-up resistor (typically 2.2–10 kΩ) |
| VDD | Power supply | 2.5–3.6 V core supply; decoupling capacitor (100 nF) required near pin for stable I²C and EEPROM operation |
| VSS | Ground | Supply ground reference; must be connected directly to PCB ground plane for EMI and signal integrity |
Key Features
| Feature | Design Value |
|---|---|
| Drop-in PCF8574 replacement | Same I²C GPIO address map (0x20–0x27) and register structure, enabling legacy design upgrades without firmware changes |
| Integrated EEPROM | 256 × 8 non-volatile memory stores board manufacturing data, revision codes, or error logs-accessible separately from GPIO via 0xA0–0xA7 addresses |
| Hot insertion support | Internal power-on reset and glitch-free power-up sequence allow safe insertion/removal in live backplane systems without bus disruption |
| 5 V tolerant I/Os | Enables direct interface with 5 V logic subsystems (e.g., sensors, LEDs, legacy controllers) without level shifters in mixed-voltage designs |
| Noise-immune I²C interface | SCL/SDA inputs include built-in filters rejecting spikes ≤50 ns, reducing false START/STOP detection in electrically noisy telecom infrastructure |
Applications
| Board Version Tracking | Multi-Card Health Monitoring |
|---|---|
Use Scenario: Storing board revision, build date, and firmware version during manufacturing for field diagnostics and recall traceability. IC Role / Device Role / Timing Role: PCA9500PW,112 acts as persistent configuration memory and status I/O hub, with EEPROM storing immutable identifiers and GPIO reporting real-time sensor/LED states. Use Value: Eliminates need for separate EEPROM + I/O expander, reducing BOM count and PCB area in telecom line cards and base station modules. |
Use Scenario: Monitoring temperature, voltage, and fan status across eight pluggable cards in a telecom shelf, with centralized CPU polling via I²C. IC Role / Device Role / Timing Role: PCA9500PW,112 serves as distributed health agent-its 8 GPIOs monitor discrete alarms while EEPROM retains fault history across power cycles. Use Value: Enables deterministic polling at 400 kHz, supporting sub-100 ms full-shelf health checks without interrupt latency or additional microcontroller resources. |
| Field Troubleshooting Interface | Backplane Configuration Bus |
Use Scenario: Providing service technicians with LED-based status codes (e.g., "Firmware Mismatch", "Thermal Shutdown") readable without tools or software. IC Role / Device Role / Timing Role: PCA9500PW,112 maps diagnostic flags from host CPU to local LEDs via GPIO outputs, while EEPROM holds last-fault timestamp and error code. Use Value: Reduces mean time to repair (MTTR) by enabling visual root-cause identification without booting host OS or connecting debug probes. |
Use Scenario: Using I²C as intra-backplane communication channel between main controller and peripheral cards for configuration handshaking and resource allocation. IC Role / Device Role / Timing Role: PCA9500PW,112 functions as standardized configuration node-EEPROM stores card type and capabilities; GPIO signals readiness and interrupt events. Use Value: Standardizes card onboarding across heterogeneous subsystems (e.g., RF, DSP, power), eliminating custom FPGA logic or dedicated configuration buses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar I/O expansion with memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PCA9501PW,112 | Includes dedicated INT output pin for GPIO change notification; identical EEPROM and I/O architecture | Required where host CPU needs asynchronous interrupt on I/O state change instead of polling | Select PCA9501PW,112 when real-time event detection is critical; PCA9500PW,112 suffices for polled status reads |
| PCF8574AT | No integrated EEPROM; 8-bit I/O only; same I²C address map (0x38–0x3F) but different base address than PCA9500PW,112 (0x20–0x27) | Used where board ID storage is handled externally or unnecessary; lower cost but higher BOM complexity | Choose PCF8574AT only if EEPROM is redundant and pin-compatible replacement is acceptable with address reconfiguration |
Compared with PCA9501PW,112, the PCA9500PW,112 lacks interrupt signaling but offers identical EEPROM functionality and lower pin count; versus PCF8574AT, it adds non-volatile storage at the cost of slightly higher unit price and different I²C address space-making it optimal for configuration-critical, space-constrained telecom modules.
Availability
PCA9500PW,112 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial backplane systems, and embedded diagnostics requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for PCA9500PW,112 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 specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with over 50 years of analog and mixed-signal IC heritage.
The PCA9500PW,112 belongs to NXP's I²C ecosystem of intelligent peripherals, engineered specifically for reliable board-level configuration, diagnostics, and hot-plug I/O expansion in carrier-grade telecom and networking equipment.
FAQ
What is the I²C address range for PCA9500PW,112 GPIO and EEPROM functions?
The PCA9500PW,112 presents two independent I²C slave addresses: the GPIO port uses base address 0x20 with A0–A2 bits determining the full 7-bit address (0x20–0x27), while the EEPROM uses base address 0xA0 (0xA0–0xA7). This dual-address scheme allows the bus master to access I/O state and non-volatile storage as separate logical devices without conflict.
How does the WC pin protect EEPROM data in PCA9500PW,112?
The WC (Write Control) pin on PCA9500PW,112 must be held LOW to enable EEPROM write operations; when HIGH, all write attempts are ignored, preserving stored data such as board IDs or calibration values. This hardware-level protection prevents accidental overwrites during power transients or firmware bugs, ensuring EEPROM integrity across the product lifecycle.
Can PCA9500PW,112 operate with a 5 V microcontroller I²C bus?
Yes - PCA9500PW,112 features 5 V tolerant SCL and SDA pins, allowing direct connection to 5 V I²C masters without level shifters. Its VDD supply remains at 2.5–3.6 V, but input thresholds scale with VDD (VIH = 0.7×VDD), and internal clamping diodes safely handle 5 V logic swings on data lines.
What is the maximum number of PCA9500PW,112 devices supported on a single I²C bus?
Up to eight PCA9500PW,112 devices can share one I²C bus using the three hardware address pins (A0, A1, A2). Each combination yields a unique 7-bit slave address for both GPIO (0x20–0x27) and EEPROM (0xA0–0xA7) interfaces, enabling scalable multi-card monitoring without address collisions or software arbitration.
Does PCA9500PW,112 support hot insertion in live backplane systems?
Yes - PCA9500PW,112 incorporates internal power-on reset, glitch-free power-up sequencing, and noise-filtered I²C inputs to support safe hot insertion. When plugged into a powered backplane, it initializes cleanly without disrupting bus traffic, making it ideal for modular telecom and server chassis requiring zero-downtime card replacement.
PCA9500PW,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Number of I/O:
- 8
- Interface:
- I2C, SMBus
- Interrupt Output:
- No
- Features:
- EEPROM, POR
- Output Type:
- Push-Pull
- Current - Output Source/Sink:
- 100µA, 25mA
- Clock Frequency:
- 400 kHz
- Voltage - Supply:
- 2.5V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
PCA9500PW,112 FAQ
1.How can I place an order for PCA9500PW,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9500PW,112 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 PCA9500PW,112 reliable?
The price and inventory of PCA9500PW,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9500PW,112 is usually 5 days.
3.What payment methods are accepted for PCA9500PW,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9500PW,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9500PW,112?
PCA9500PW,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9500PW,112 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 PCA9500PW,112?
For technical support, including PCA9500PW,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9500PW,112 requirements.
6.How does Aetrix verify that PCA9500PW,112 is sourced from the original manufacturer or authorized distributors?
All PCA9500PW,112 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 PCA9500PW,112 meets industry standards.
7.What is the process for return or replacement of PCA9500PW,112?
All PCA9500PW,112 units undergo pre-shipment inspection (PSI). If there is an issue with PCA9500PW,112, 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 PCA9500PW,112 part is unused and in its original packaging.
Return procedure for PCA9500PW,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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