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NXP Semiconductors PCA9665D,112
- Part No.:
- PCA9665D,112
- Manufacturer:
- NXP Semiconductors
- Category:
- Controllers
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
PCA9665D,112.pdf
- Description:
- IC CNTRLR PARALLEL/I2C 20-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,832
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Product details
Overview
PCA9665D,112 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 protocol bridging without external timing components.
For engineers reviewing the PCA9665D,112 datasheet, PCA9665D,112 pinout, PCA9665D,112 application, or PCA9665D,112 equivalent, this device serves as a drop-in upgrade path from PCA9564 with enhanced drive strength, buffered mode support, and software reset-critical for embedded systems integrating legacy parallel interfaces with modern I²C peripherals.
Technical Context
The PCA9665D,112 integrates an internal oscillator (28.5 MHz typical) eliminating external crystals, and handles all I²C protocol layers-including arbitration, START/STOP generation, ACK/NACK management, and clock stretching-via dedicated hardware logic. Its register architecture separates direct-access (A0/A1-controlled) and indirect-access registers, enabling flexible configuration of SCL timing, byte count, own address, and timeout behavior.
It supports two operational modes: Byte mode for single-byte transfers and Buffered mode for up to 68-byte bursts, both configurable via the MODE bit in I2CCON. The device implements Fast-mode Plus (Fm+) with 25 mA SCL/SDA sink capability, ensuring robust bus driving under capacitive loads while maintaining full Standard- and Fast-mode compatibility and SMBus interoperability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| I²C Speed | Up to 1 Mbit/s (Fast-mode Plus), enabling high-throughput sensor or EEPROM interfacing without bus bottlenecks. |
| Supply Voltage | 2.3 V to 3.6 V-compatible with modern low-voltage microcontrollers and battery-powered designs. |
| I/O Tolerance | 5 V tolerant on all parallel bus pins (D0–D7, A0, A1, RD, WR, CE, INT, RESET)-simplifies level-shifting in mixed-voltage systems. |
| Buffer Size | 68-byte FIFO-reduces CPU overhead during bulk I²C transfers such as display initialization or firmware updates. |
| SCL/SDA Drive | 25 mA sink capability-supports longer traces, higher node counts, and faster rise times per Fm+ specification. |
| Internal Oscillator | 28.5 MHz ±15 % trimmed-eliminates external crystal and associated layout area/cost while meeting I²C timing budgets. |
| Operating Temp | −40 °C to +85 °C-validated for industrial and automotive under-hood applications requiring extended thermal range. |
Pinout & Package
PCA9665D,112 is housed in a plastic small outline package (SO20) with 20 leads and 7.5 mm body width (SOT163-1), optimized for automated assembly and thermal reliability in dense PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D7 | Parallel data bus I/O | Bidirectional 3-state interface to microcontroller data bus; D0 = LSB, supports byte-aligned read/write cycles. |
| A0, A1 | Register address select | Directly selects among five internal registers (I2CSTA, INDPTR, I2CDAT, I2CCON, INDIRECT) without address decoding logic. |
| RD, WR, CE | Parallel bus control | Standard 8080-style strobes: CE enables bus access; RD/WR latch data on rising edge-no glue logic required. |
| INT | Interrupt request output | Active-low open-drain signal indicating I²C state change or transfer completion-requires external pull-up. |
| RESET | Hardware reset input | Active-low asynchronous reset clearing all registers and halting I²C state machine-debounced externally. |
| SCL, SDA | I²C serial interface | Open-drain bidirectional lines compliant with I²C electrical specs; each requires external pull-up resistor. |
| VDD, VSS | Power supply | 2.3–3.6 V core supply with dedicated ground-decoupling capacitor placement near VDD/VSS critical for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Parallel-to-I²C protocol conversion | Full hardware implementation of I²C master/slave, arbitration, START/STOP, ACK/NACK-offloads CPU and eliminates firmware timing risks. |
| 68-byte buffered mode | Enables burst transfers without CPU intervention-reducing interrupt latency and improving throughput in multi-sensor systems. |
| Software reset capability | Write to I2CPRESET register resets internal state machine and registers-enabling recovery from bus lockup without power cycle. |
| Fm+ 25 mA SCL/SDA drive | Drives 400 pF bus capacitance at 1 Mbit/s-supports >10 nodes or >20 cm trace lengths without repeaters. |
| I²C General Call support | Configurable via GC bit in I2CADR-allows broadcast commands to multiple devices (e.g., synchronized calibration or sleep entry). |
Applications
| Industrial PLC I/O Expansion | Automotive Body Control Module |
|---|---|
Use Scenario: Adding isolated I²C sensor networks (temperature, humidity, position) to legacy 8-bit microcontroller-based PLCs with no native I²C peripheral. IC Role / Device Role / Timing Role: Parallel-bus-to-I²C bridge acting as I²C master to manage up to 127 sensors, handling arbitration and clock stretching autonomously. Use Value: Eliminates need for FPGA or dual-CPU architecture-reducing BOM cost by 35 % and board space by 40 % versus discrete logic solutions. |
Use Scenario: Integrating door module ECUs with centralized body controller using I²C for window lift, mirror fold, and seat position feedback. IC Role / Device Role / Timing Role: I²C slave device receiving configuration commands and reporting status over robust 1 Mbit/s Fm+ link with 25 mA drive margin. Use Value: Ensures reliable communication across noisy automotive harnesses-meeting ISO 11898-2 EMC requirements without additional filtering. |
| Medical Patient Monitor Backplane | Smart Energy Meter Communication Hub |
Use Scenario: Connecting analog front-end ASICs and EEPROMs to a main ARM Cortex-M4 processor via I²C, where parallel bus is only available on the monitor's mainboard. IC Role / Device Role / Timing Role: I²C master with 68-byte buffering-transferring calibration data blocks from EEPROM to ADC registers in single burst operations. Use Value: Reduces I²C transaction time by 62 % versus byte-by-byte transfers-improving real-time response for vital sign updates. |
Use Scenario: Bridging metrology SoC (parallel interface) to I²C-connected RF transceivers (LoRaWAN, NB-IoT) and tamper-detection sensors in utility meters. IC Role / Device Role / Timing Role: Dual-role controller-acting as I²C slave for host MCU configuration and I²C master for peripheral polling during wake-up cycles. Use Value: Enables ultra-low-power operation with software reset and interrupt-driven wake-extending battery life beyond 15 years in sealed meters. |
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 |
|---|---|---|---|
| PCA9564D,112 | Lacks 68-byte buffer, 1 Mbit/s Fm+ support, and software reset; max 400 kbit/s Fast-mode only; 15 mA SCL/SDA drive. | Restricted to low-bandwidth, low-node-count I²C systems; unsuitable for burst transfers or noisy environments. | Select when cost sensitivity outweighs performance needs and existing PCA9564 design reuse is prioritized. |
| PCA9665APW,118 | Same core functionality but uses TSSOP20 package and 'glitch-free' restart logic; oscillator trimmed to 32 MHz for tighter timing margins. | Better suited for high-reliability buffer-driver applications where restart stability prevents metastability during hot-plug events. | Prefer for new designs requiring enhanced restart robustness and smaller footprint-though not pin-compatible with SO20 PCA9665D,112. |
Compared with PCA9564D,112, PCA9665D,112 delivers 2.5× higher speed and integrated buffering; versus PCA9665APW,118, it trades TSSOP compactness and glitch-free restart for SO20 manufacturability and legacy footprint compatibility-making it optimal for industrial upgrades where board rework must be minimized.
Availability
PCA9665D,112 is available at Aetrix Electronics and suitable for industrial PLC expansion, automotive body control modules, medical patient monitor backplanes, and smart energy meter communication hubs requiring stable component supply across long production lifecycles.
Supply support for PCA9665D,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 expertise in interface, power management, and embedded processing technologies.
The PCA9665D,112 belongs to NXP's I²C protocol controller product line, designed specifically to simplify integration of legacy parallel-bus microcontrollers with modern I²C sensor, memory, and peripheral ecosystems.
FAQ
What is the maximum I²C bus speed supported by the PCA9665D,112?
The PCA9665D,112 supports Fast-mode Plus (Fm+) operation at up to 1 Mbit/s. This is achieved through its 25 mA SCL/SDA sink capability and internal oscillator calibrated to 28.5 MHz, enabling reliable timing compliance even with 400 pF bus capacitance-significantly exceeding standard Fast-mode (400 kbit/s) limits.
Does the PCA9665D,112 require an external crystal or oscillator?
No, the PCA9665D,112 contains a factory-trimmed internal oscillator operating at 28.5 MHz ±15 %, which fully satisfies I²C timing requirements for Standard-, Fast-, and Fast-mode Plus operation. No external timing components are needed-reducing BOM count, PCB area, and system cost.
How does the 68-byte buffer in the PCA9665D,112 improve system performance?
The 68-byte buffer in the PCA9665D,112 enables Buffered mode operation, allowing up to 68 bytes to be transferred in a single I²C transaction without CPU intervention. This reduces interrupt frequency, lowers CPU load, and accelerates bulk operations like display initialization or EEPROM programming-cutting total transfer time by over 60 % versus byte-mode transfers.
Is the PCA9665D,112 pin-compatible with the older PCA9564?
Yes, the PCA9665D,112 maintains identical SO20, TSSOP20, and HVQFN20 footprints with the PCA9564, enabling direct replacement in existing designs. However, PCA9665D,112 adds new features-including 1 Mbit/s Fm+ support, 68-byte buffer, and software reset-which require updated firmware but no PCB changes.
What is the purpose of the I2CPRESET register in the PCA9665D,112?
The I2CPRESET register in the PCA9665D,112 provides a software-initiated reset function: writing any value to this indirect register clears all internal registers, resets the I²C state machine, and returns the device to idle state-enabling recovery from bus lockup or misconfiguration without requiring a hardware RESET signal or power cycle.
PCA9665D,112 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,112 FAQ
1.How can I place an order for PCA9665D,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9665D,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 PCA9665D,112 reliable?
The price and inventory of PCA9665D,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9665D,112 is usually 5 days.
3.What payment methods are accepted for PCA9665D,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9665D,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9665D,112?
PCA9665D,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9665D,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 PCA9665D,112?
For technical support, including PCA9665D,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9665D,112 requirements.
6.How does Aetrix verify that PCA9665D,112 is sourced from the original manufacturer or authorized distributors?
All PCA9665D,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 PCA9665D,112 meets industry standards.
7.What is the process for return or replacement of PCA9665D,112?
All PCA9665D,112 units undergo pre-shipment inspection (PSI). If there is an issue with PCA9665D,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 PCA9665D,112 part is unused and in its original packaging.
Return procedure for PCA9665D,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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