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NXP Semiconductors PCA9665D,118
- Part No.:
- PCA9665D,118
- Manufacturer:
- NXP Semiconductors
- Category:
- Controllers
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
PCA9665D,118.pdf
- Description:
- IC CNTRLR PARALLEL/I2C 20-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,999
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Product details
Overview
PCA9665D,118 from NXP Semiconductors is a parallel-bus-to-I²C-bus controller IC enabling bidirectional communication between 8-bit parallel microcontrollers and the I²C-bus at up to 1 Mbit/s (Fast-mode Plus). It operates as master or slave, features a 68-byte buffer, 2.3–3.6 V supply, and 5 V-tolerant I/Os-used in industrial control modules requiring legacy parallel CPU interfacing with modern I²C peripherals.
For engineers reviewing the PCA9665D,118 datasheet, PCA9665D,118 pinout, PCA9665D,118 application, or PCA9665D,118 equivalent, key selection considerations include its SO20 package compatibility, software reset capability via parallel bus, 25 mA SCL/SDA drive strength, and support for General Call addressing in embedded system expansion designs.
Technical Context
The PCA9665D,118 integrates an internal oscillator (28.5 MHz typical) eliminating external timing components and handles all I²C protocol layers-including arbitration, START/STOP generation, ACK/NACK management, and clock stretching-without firmware overhead. Its register architecture separates direct-access (I2CSTA, I2CDAT, I2CCON) and indirect-access registers (I2CSCLL, I2CADR, I2CTO) via A0/A1 address decoding.
It supports two operational modes: Byte mode for single-byte transfers and Buffered mode for up to 68-byte burst transfers using interrupt- or polled-handshake. The device implements Fast-mode Plus (Fm+) compliance with 1 Mbit/s data rate, 25 mA sink capability on SCL/SDA, and hardware-level timeout detection to recover from bus lockups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Interface Type | Parallel-bus (8-bit D0–D7) to I²C-bus protocol converter with master/slave dual-role capability |
| Max I²C Speed | 1 Mbit/s (Fast-mode Plus), enabling high-throughput sensor/peripheral interfacing without timing margin compromise |
| Data Buffer Size | 68-byte FIFO buffer supporting burst transfers in Buffered mode-reducing CPU interrupt load and improving throughput efficiency |
| Supply Voltage | 2.3 V to 3.6 V-compatible with modern low-voltage microcontrollers while maintaining robust noise immunity |
| I/O Tolerance | 5 V tolerant parallel I/Os-allowing direct connection to legacy 5 V logic without level-shifting circuitry |
| SCL/SDA Drive | 25 mA sink current per line-supporting longer bus traces, higher capacitance loads, and multiple slave devices without external drivers |
| Oscillator | Internal 28.5 MHz oscillator trimmed to ±15 % accuracy-eliminating external crystal/capacitor and reducing BOM count |
Pinout & Package
PCA9665D,118 is housed in a plastic small outline package (SO20) with 20 leads and 7.5 mm body width (SOT163-1), optimized for through-hole and surface-mount assembly in space-constrained industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D7 | Parallel data bus I/O | Bidirectional 3-state interface to CPU data bus; D0 = LSB, enables byte-aligned command/data/status exchange |
| WR | Write strobe input | Active-low signal latching data into addressed register on rising edge-synchronizes parallel write cycles with internal state machine |
| RD | Read strobe input | Active-low signal enabling register contents onto D0–D7 bus on falling edge-supports non-destructive status reads |
| CE | Chip enable input | Active-low global enable controlling 3-state output behavior of D0–D7; required for multi-device parallel bus sharing |
| A0, A1 | Register address select | Binary-encoded inputs selecting among five direct-access registers (I2CSTA, INDPTR, I2CDAT, I2CCON, INDIRECT) |
| INT | Interrupt request output | Open-drain active-low signal indicating I²C state transitions-enables efficient polled or interrupt-driven host CPU coordination |
| RESET | Hardware reset input | Active-low asynchronous reset clearing internal registers and halting I²C state machine-ensures deterministic startup |
| SCL, SDA | I²C-bus clock/data I/O | Open-drain bidirectional lines requiring external pull-ups; support Fast-mode Plus timing and 25 mA sink capability |
| VDD, VSS | Power supply terminals | VDD = 2.3–3.6 V core supply; VSS = ground reference-decoupling capacitor placement critical for oscillator stability |
Key Features
| Feature | Design Value |
|---|---|
| Software reset via parallel bus | Writing to I2CPRESET register (indirect address 05h) performs full internal reset-enabling recovery without hardware RESET line assertion |
| I²C General Call support | Configurable via GC bit in I2CADR register-allows broadcast commands to all compatible slaves, simplifying system-wide configuration |
| Bus timeout protection | I2CTO register (04h) sets SCL LOW timeout threshold-automatically releases stuck bus and triggers interrupt for error handling |
| Flexible clock rate programming | I2CSCLL/I2CSCLH registers (02h/03h) allow precise SCL HIGH/LOW period tuning-enabling custom timing for marginal bus conditions |
| Multi-master arbitration | Hardware-managed arbitration logic resolves bus contention during simultaneous START conditions-ensuring deterministic master priority without software intervention |
Applications
| Industrial PLC Expansion Module | Medical Device Sensor Hub |
|---|---|
Use Scenario: Adding I²C connectivity to an aging 8-bit microcontroller-based programmable logic controller with no native I²C peripheral. IC Role / Device Role / Timing Role: Parallel-to-I²C bridge acting as I²C master to manage temperature, pressure, and flow sensors on shared bus segments. Use Value: Eliminates need for FPGA or additional MCU; leverages existing parallel bus infrastructure while enabling modern low-pin-count sensor integration. |
Use Scenario: Centralized acquisition of calibrated analog sensor data from multiple I²C ADCs and digital health monitors in portable diagnostic equipment. IC Role / Device Role / Timing Role: Buffered-mode I²C master coordinating time-synchronized reads across 12+ sensor nodes using 68-byte burst transfers. Use Value: Reduces host CPU interrupt frequency by >85 % versus byte-mode polling-extending battery life and ensuring deterministic sampling intervals. |
| Automotive Body Control Unit | Smart Energy Meter Interface |
Use Scenario: Interfacing legacy 8051-based BCM with I²C EEPROMs, window motor drivers, and ambient light sensors in cost-sensitive vehicle platforms. IC Role / Device Role / Timing Role: Dual-role controller operating as I²C slave for configuration updates and master for peripheral polling under ECU command. Use Value: Enables reuse of proven parallel-bus firmware stack while meeting automotive I²C interoperability requirements (SMBus-compatible, 5 V tolerant). |
Use Scenario: Isolating high-voltage metering ASICs from low-voltage communication processors via optocoupled I²C links in smart electricity meters. IC Role / Device Role / Timing Role: I²C master initiating secure firmware updates to tamper-evident crypto modules and reading metrology registers. Use Value: 25 mA SCL/SDA drive ensures reliable signaling across isolation barriers with elevated trace capacitance-reducing field failure rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar parallel-to-I²C interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PCA9665PW,118 | TSSOP20 package (4.4 mm width); identical electrical specs and register map-same die, different footprint | Preferred for high-density PCB layouts where SO20's 7.5 mm width causes routing congestion | Select when board space is constrained and reflow soldering is available; requires layout revision but no firmware change |
| PCA9564,118 | Lacks Fm+ support (max 400 kbit/s), 32-byte buffer, no General Call, no software reset-legacy predecessor with reduced feature set | Suitable only for low-speed, low-complexity I²C expansion where 1 Mbit/s or buffered transfers are unnecessary | Choose only for cost-sensitive legacy replacements where performance and advanced features are not required |
Compared with PCA9665PW,118, the PCA9665D,118 offers identical functionality in a wider SO20 package easing hand-soldering and test probe access; versus PCA9564,118, it delivers 2.5× speed, double buffer depth, and critical reliability features like bus timeout and software reset-justifying upgrade in new designs.
Availability
PCA9665D,118 is available at Aetrix Electronics and suitable for industrial PLC expansion modules, medical sensor hubs, automotive body control units, and smart energy meter interfaces requiring stable component supply across extended production lifecycles.
Supply support for PCA9665D,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 specializing in secure connectivity solutions for automotive, industrial, and IoT applications-with over 20 years of I²C interface IP development.
The PCA9665D,118 belongs to NXP's Fm+ parallel-bus-to-I²C controller product line, designed specifically to extend legacy microcontroller systems with high-speed, robust, and standards-compliant I²C connectivity in resource-constrained environments.
FAQ
What is the maximum I²C-bus speed supported by the PCA9665D,118?
The PCA9665D,118 supports Fast-mode Plus (Fm+) operation at up to 1 Mbit/s. This is achieved via internal timing control and 25 mA SCL/SDA drive strength, enabling reliable communication with high-capacitance or multi-drop I²C buses. The PCA9665D,118 achieves this without external timing components thanks to its integrated 28.5 MHz oscillator.
Does the PCA9665D,118 require an external crystal or oscillator?
No, the PCA9665D,118 contains an internal oscillator trimmed to ±15 % accuracy, eliminating the need for external crystals, capacitors, or clock generators. This reduces BOM cost and PCB area while simplifying design validation-the PCA9665D,118 starts up in ~550 µs after ENSIO is enabled.
How does the 68-byte buffer in the PCA9665D,118 improve system performance?
The 68-byte buffer allows the PCA9665D,118 to operate in Buffered mode, enabling burst transfers of up to 68 bytes without CPU intervention per byte. This cuts host interrupt overhead by >80 % compared to Byte mode, freeing CPU cycles for real-time tasks-especially valuable in medical sensor hubs and industrial controllers using the PCA9665D,118.
Can the PCA9665D,118 be used with 5 V microcontrollers?
Yes, the parallel I/O pins (D0–D7, RD, WR, CE, A0, A1, RESET, INT) of the PCA9665D,118 are 5 V tolerant while operating from a 2.3–3.6 V VDD supply. This allows direct interfacing with legacy 5 V microcontrollers without level shifters-simplifying integration in upgrades of existing industrial or automotive systems using the PCA9665D,118.
What is the purpose of the I2CTO register in the PCA9665D,118?
The I2CTO register (indirect address 04h) configures the SCL LOW timeout threshold. If SCL remains LOW beyond this value, the PCA9665D,118 automatically releases the bus, loads status code 78h into I2CSTA, and asserts INT-preventing system lockup due to faulty slaves or wiring faults. This autonomous recovery is critical in unattended applications using the PCA9665D,118.
PCA9665D,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Programmable:
- Not Verified
- Protocol:
- I2C
- Function:
- Controller
- Interface:
- Parallel
- Standards:
- -
- Voltage - Supply:
- 2.3V ~ 3.6V
- Current - Supply:
- 100µA
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-SO
- Grade:
- -
- Qualification:
- -
PCA9665D,118 FAQ
1.How can I place an order for PCA9665D,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9665D,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 PCA9665D,118 reliable?
The price and inventory of PCA9665D,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9665D,118 is usually 5 days.
3.What payment methods are accepted for PCA9665D,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9665D,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9665D,118?
PCA9665D,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9665D,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 PCA9665D,118?
For technical support, including PCA9665D,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9665D,118 requirements.
6.How does Aetrix verify that PCA9665D,118 is sourced from the original manufacturer or authorized distributors?
All PCA9665D,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 PCA9665D,118 meets industry standards.
7.What is the process for return or replacement of PCA9665D,118?
All PCA9665D,118 units undergo pre-shipment inspection (PSI). If there is an issue with PCA9665D,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 PCA9665D,118 part is unused and in its original packaging.
Return procedure for PCA9665D,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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