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NXP Semiconductors PCA9665BS,118
- Part No.:
- PCA9665BS,118
- Manufacturer:
- NXP Semiconductors
- Category:
- Controllers
- Package:
- 20-VQFN Exposed Pad
- Datasheet:
-
PCA9665BS,118.pdf
- Description:
- IC CNTRLR PARALLEL/I2C 20-HVQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,843
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Product details
Overview
PCA9665BS,118 from NXP Semiconductors is a Fast-mode Plus (Fm+) parallel-bus-to-I²C-bus controller IC that bridges 8-bit parallel microcontrollers to the I²C-bus as master or slave. It supports 1 Mbit/s data rate, 68-byte buffer, 2.3–3.6 V supply, and 5 V-tolerant I/Os-enabling robust I²C expansion in industrial control panels with space-constrained PCB layouts.
For engineers reviewing the PCA9665BS,118 datasheet, PCA9665BS,118 pinout, PCA9665BS,118 application, or PCA9665BS,118 equivalent, this device delivers verified Fm+ timing compliance, software reset capability via parallel bus, and interrupt-driven buffered transfers-critical for deterministic real-time I²C bridging in embedded systems with legacy parallel interfaces.
Technical Context
The PCA9665BS,118 integrates an internal oscillator (28.5 MHz typical) to generate precise SCL timing without external crystals, supporting both Byte and Buffered transfer modes with hardware-managed arbitration and protocol handling. Its register architecture separates four direct-access registers (I2CSTA, INDPTR, I2CDAT, I2CCON) from seven indirect-addressed registers-including I2CSCLL/I2CSCLH for programmable clock low/high periods and I2CTO for configurable SCL timeout detection.
It implements full multi-master I²C-bus behavior with START/STOP/repeated START generation, General Call recognition, and AA flag-controlled acknowledge logic. The device operates in either master or slave mode under ENSIO control, with SI-flag-triggered interrupts and 3-state parallel data bus (D0–D7) synchronized by CE/WR/RD strobes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Interface Type | Parallel-bus (8-bit D0–D7) to I²C-bus converter with master/slave dual-role support |
| I²C Speed Mode | Fast-mode Plus (Fm+) up to 1 Mbit/s-enables higher throughput than standard Fast-mode (400 kbit/s) |
| Supply Voltage | 2.3 V to 3.6 V-compatible with modern low-voltage microcontrollers and LDO outputs |
| I/O Tolerance | 5 V tolerant on all parallel I/O pins-allows direct interfacing with 5 V logic without level shifters |
| Data Buffer | 68-byte FIFO buffer-reduces CPU overhead during bulk I²C transfers and prevents bus blocking |
| SCL/SDA Drive | 25 mA sink capability on SCL/SDA-supports longer traces and higher bus capacitance in noisy industrial environments |
| Operating Temp | −40 °C to +85 °C-qualified for extended industrial temperature range operation |
Pinout & Package
PCA9665BS,118 is housed in a 5 mm × 5 mm × 0.85 mm HVQFN20 (SOT662-1) package with exposed thermal pad. Pin 1 is located at top-left corner of transparent top view; VSS connects to both pin 7 and the center thermal pad, which must be soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D7 | Bidirectional parallel data bus | 8-bit 3-state interface to MCU data bus; D0 = LSB; requires CE/WR/RD coordination for read/write cycles |
| CE | Chip Enable (active LOW) | Enables D0–D7 tristate control; rising edge latches data when WR is active-critical for synchronous register access |
| WR / RD | Write and Read strobes | Edge-triggered controls: WR rising edge loads data into addressed register; RD falling edge places register content on D0–D7 |
| A0 / A1 | Register address select | Directly selects among five register spaces (I2CSTA, INDPTR, I2CDAT, I2CCON, INDIRECT) per Table 3 |
| INT | Interrupt request (open-drain) | Active LOW signal asserted on serial event (SI=1); requires external pull-up; synchronizes CPU response to I²C state changes |
| RESET | Hardware reset (active LOW) | Clears internal registers and resets I²C state machine-used for fail-safe recovery after bus lockup |
| SCL / SDA | I²C-bus clock/data (open-drain) | Require external pull-ups; support Fm+ 1 Mbit/s; 25 mA drive strength enables >400 pF bus capacitance |
| VDD / VSS | Power supply and ground | VDD = 2.3–3.6 V; VSS connects to pin 7 and thermal pad-both must be solidly grounded for stable operation |
Key Features
| Feature | Design Value |
|---|---|
| Internal oscillator | 28.5 MHz trimmed oscillator eliminates external crystal/capacitors-reducing BOM count and layout area |
| Software reset | Parallel-bus-initiated reset via I2CPRESET register-enables full functional recovery without hardware RESET line assertion |
| General Call support | Configurable GC bit in I2CADR register enables broadcast commands to multiple slaves-simplifies system-wide configuration |
| Buffered transfer mode | 68-byte buffer allows burst reads/writes without CPU intervention-improves throughput in sensor array or EEPROM programming |
| ESD & latch-up robustness | 2000 V HBM / 1000 V CDM ESD rating and >100 mA latch-up immunity-ensures reliability in handling-sensitive industrial assembly |
Applications
| Industrial PLC I/O Expansion | Automotive Body Control Module |
|---|---|
|
Use Scenario: Adding isolated I²C peripheral connectivity (e.g., temperature sensors, EEPROMs) to legacy 8-bit microcontroller-based PLC backplanes with limited GPIO. IC Role / Device Role / Timing Role: Parallel-to-I²C protocol translator acting as I²C master; handles arbitration, START/STOP, ACK/NACK, and clock stretching autonomously. Use Value: Eliminates need for FPGA or software-bit-banged I²C, reducing firmware complexity and ensuring deterministic 1 Mbit/s timing across 20+ node buses. |
Use Scenario: Integrating distributed door-lock actuators, mirror position sensors, and ambient light modules into a centralized BCM using shared I²C infrastructure. IC Role / Device Role / Timing Role: I²C slave interface for local microcontrollers-accepting commands via General Call and reporting status through buffered reads. Use Value: 5 V-tolerant parallel I/O allows direct connection to 5 V BCM host bus; 68-byte buffer accommodates multi-sensor diagnostic reports in single transaction. |
| Medical Patient Monitor Front-End | Smart Energy Meter Communication Hub |
|
Use Scenario: Connecting analog front-end ASICs and calibration EEPROMs to a safety-certified ARM Cortex-M4 host via isolated I²C links. IC Role / Device Role / Timing Role: Isolated I²C master with software reset and timeout protection-prevents bus hang during critical measurement cycles. Use Value: I2CTO register enables configurable SCL stall detection (e.g., 10 ms timeout), triggering safe fallback before patient data loss occurs. |
Use Scenario: Bridging metrology SoC (with only parallel interface) to I²C-connected RF transceivers, tamper-detection switches, and secure crypto modules. IC Role / Device Role / Timing Role: Dual-role controller-acts as I²C master for peripherals and slave for host processor command polling. Use Value: 25 mA SCL/SDA drive sustains reliable communication over 15 cm flex PCB traces in compact meter housing with EMI shielding. |
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 |
|---|---|---|---|
| PCA9665D,118 | Same core functionality but in SO20 package (7.5 mm width); no thermal pad; lower thermal performance | Preferred for through-hole prototyping or legacy SOIC footprints; unsuitable for high-density or thermally constrained designs | Select PCA9665D,118 only if board layout mandates SO20 or thermal dissipation < 0.5 W is sufficient |
| PCA9665PW,118 | Identical electrical specs and register map; TSSOP20 package (4.4 mm width) with gull-wing leads instead of HVQFN's exposed pad | Better manufacturability in wave-soldered assemblies; less effective heat spreading than HVQFN20 under sustained 1 Mbit/s operation | Choose PCA9665PW,118 for cost-sensitive volume production where reflow profile control is limited or thermal load is moderate |
Compared with PCA9665BS,118, the SO20 and TSSOP20 variants trade thermal efficiency and board-space density for assembly flexibility-making PCA9665BS,118 the optimal choice for compact, thermally demanding industrial or medical I²C bridge applications requiring sustained Fm+ throughput.
Availability
PCA9665BS,118 is available at Aetrix Electronics and suitable for industrial PLCs, automotive body controllers, medical monitoring front-ends, and smart energy meters requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for PCA9665BS,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 broad expertise in interface, power management, and microcontroller technologies.
The PCA9665BS,118 belongs to NXP's Fm+ parallel-bus-to-I²C controller family, designed specifically to extend I²C connectivity to legacy parallel-bus microcontrollers while meeting industrial timing, noise immunity, and thermal reliability requirements.
FAQ
What is the maximum I²C-bus speed supported by the PCA9665BS,118?
The PCA9665BS,118 supports Fast-mode Plus (Fm+) operation up to 1 Mbit/s. This is achieved using its internal 28.5 MHz oscillator and programmable I2CSCLL/I2CSCLH registers to configure SCL timing. Unlike standard Fast-mode (400 kbit/s), Fm+ enables higher throughput for time-critical sensor or memory transactions-verified in the official NXP datasheet Rev. 4.
Does the PCA9665BS,118 require an external crystal or resonator?
No, the PCA9665BS,118 does not require an external crystal or resonator. It contains a factory-trimmed internal oscillator operating at 28.5 MHz, which generates all necessary I²C timing signals. This eliminates two external components, reduces PCB area, and improves reliability-confirmed in Section 7.2 of the PCA9665_PCA9665A datasheet.
How does the 68-byte buffer in the PCA9665BS,118 improve system performance?
The 68-byte buffer in the PCA9665BS,118 enables Buffered mode transfers, allowing the host microcontroller to issue multi-byte read/write commands in a single parallel-bus transaction. This reduces CPU interrupt frequency and bus arbitration overhead-especially valuable when communicating with I²C EEPROMs or sensor arrays. The buffer is managed via the I2CCOUNT and INDIRECT registers.
Can the PCA9665BS,118 operate as both I²C master and slave simultaneously?
No, the PCA9665BS,118 cannot operate as master and slave simultaneously. It functions in one role at a time-configured via software control of the ENSIO and MODE bits. However, it can dynamically switch roles under firmware control, such as acting as a master to poll sensors and then as a slave to accept configuration updates from a host processor.
What is the purpose of the exposed thermal pad on the PCA9665BS,118 HVQFN20 package?
The exposed thermal pad on the PCA9665BS,118 HVQFN20 package (pin 7 and center pad) must be soldered to a PCB ground plane with thermal vias. It provides critical thermal conduction path to dissipate heat during sustained 1 Mbit/s I²C operation and ensures electrical stability of the VSS reference. Per datasheet Section 6.2, omitting pad connection risks thermal shutdown or register corruption.
PCA9665BS,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 20-VQFN Exposed Pad
- Programmable:
- Not Verified
- Protocol:
- I2C
- Function:
- Controller
- Interface:
- I2C
- Standards:
- -
- Voltage - Supply:
- 2.3V ~ 3.6V
- Current - Supply:
- 100µA
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-HVQFN (5x5)
- Grade:
- -
- Qualification:
- -
PCA9665BS,118 FAQ
1.How can I place an order for PCA9665BS,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9665BS,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 PCA9665BS,118 reliable?
The price and inventory of PCA9665BS,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9665BS,118 is usually 5 days.
3.What payment methods are accepted for PCA9665BS,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9665BS,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9665BS,118?
PCA9665BS,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9665BS,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 PCA9665BS,118?
For technical support, including PCA9665BS,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9665BS,118 requirements.
6.How does Aetrix verify that PCA9665BS,118 is sourced from the original manufacturer or authorized distributors?
All PCA9665BS,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 PCA9665BS,118 meets industry standards.
7.What is the process for return or replacement of PCA9665BS,118?
All PCA9665BS,118 units undergo pre-shipment inspection (PSI). If there is an issue with PCA9665BS,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 PCA9665BS,118 part is unused and in its original packaging.
Return procedure for PCA9665BS,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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