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NXP Semiconductors VSC050XKM-01
- Part No.:
- VSC050XKM-01
- Manufacturer:
- NXP Semiconductors
- Category:
- Controllers
- Package:
- 64-LQFP
- Datasheet:
-
VSC050XKM-01.pdf
- Description:
- VSC050SeriIControlleCMOS
- Quantity:
- Payment:
- Shipping:
Inventory:35,926
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Product details
Overview
VSC050XKM-01 from Maxim Integrated is a two-wire serial backplane controller designed for FC-AL, SCSI, SAS, and SATA enclosure management. It provides up to 40 bidirectional general-purpose I/O lines, integrated port bypass control for up to 8 drives, four fan speed monitoring inputs, four PWM outputs, and 5V-tolerant interrupt signaling - deployed in drive bay control, thermal management, and LED status indication within storage backplanes.
For engineers reviewing the VSC050XKM-01 datasheet, VSC050XKM-01 pinout, VSC050XKM-01 application, or VSC050XKM-01 equivalent, key selection criteria include I/O configurability (input/output/open-drain per pin), register-mapped fan tach input resolution (16-bit overflow + current count), PWM frequency programmability (208Hz–104kHz), and 16-device addressability on a shared I²C bus.
Technical Context
The VSC050XKM-01 implements a slave-mode two-wire serial interface compliant with standard 100kHz/400kHz I²C timing, supporting 3-bit hardware address (A2–A0) plus 1-bit device type select (ASEL) for 16 unique addresses. Its internal 10MHz oscillator-driven by external crystal on OSCI/OSCO-feeds clock dividers for LED flash rate generation, fan speed counters, and PWM logic.
Control is fully register-based: five register groups manage I/O data/direction (GPD0–GPD4, DDP0–DDP4), port bypass (PBC0–PBC7), fan speed (FSC0–FSC3, FSCO0–FSCO3, FSCC0–FSCC3), bit-level features (BCP0–BCP4, PWMC0–PWMC3), and system status (BCIS, BCT, BCO, VER). All I/O defaults to input with weak pull-up; configuration overrides occur only when PBC or fan/PWM modes are enabled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Interface | Slave-mode two-wire serial (I²C-compatible) at 100kHz/400kHz |
| I/O Count | Up to 40 configurable bidirectional pins across Ports 0–4 |
| Fan Inputs | Four dedicated tachometer inputs with 16-bit overflow and current count registers |
| PWM Outputs | Four programmable outputs with 3% duty-cycle steps and selectable base frequencies (208Hz–104kHz) |
| Interrupt | 5V-tolerant open-drain INT# with edge-detect capability per I/O pin |
| Addressing | Hardware-programmable via A2–A0 (3-bit) and ASEL (1-bit) for 16-device bus support |
| Supply | VDD = 3.3V ±10% (I/O drivers); VDD2 = 3.3V ±10% (digital core) |
Pinout & Package
Package: 64-pin PQFP (Plastic Quad Flat Package), lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A2–A0 (Pins 9–7) | Address Select Bus | Hardwired to VDD/VSS to set bits 3–1 of I²C slave address (8 possible values) |
| ASEL (Pin 12) | Device Type Select | Selects 1000b or 1100b device identifier prefix, enabling 16 total addresses |
| SCL (Pin 13) | Serial Clock Input | 5V-tolerant clock line for I²C communication; synchronizes SDA sampling |
| SDA (Pin 14) | Serial Data Bidirectional | 5V-tolerant bidirectional data line; supports START/STOP detection |
| INT# (Pin 15) | Interrupt Output | Open-drain output asserting on I/O edge events or fan/PWM status changes |
| P0.0–P0.7 (Pins 57–64) | General Purpose I/O Port 0 | Dedicated 8-bit port; each pin individually configurable as input, totem-pole, or open-drain output |
| P2.0–P2.3 (Pins 42–45) | PWM Outputs | Four pins configurable as PWM outputs (FSC0–FSC3) driving external MOSFETs or converters |
| P2.4–P2.7 (Pins 38–41) | Fan Tach Inputs | Four pins configurable as fan speed monitor inputs with digital filtering (100–500ns) |
| P3.0–P3.7 / P4.0–P4.7 (Pins 27–31,35–37,16–17,21–26) | Port Bypass I/O | Shared ports supporting PBC/CRU/SDU functions; override normal I/O configuration when enabled |
| OSCI/OSCO (Pins 11/10) | Oscillator Interface | Connects to 10MHz crystal; OSCI accepts external 3.3V clock if OSCO left unconnected |
| VDD/VSS/VDD2/VSS2 (Multiple Pins) | Power/Ground Distribution | Dual supply domains: VDD/VSS for I/O drivers, VDD2/VSS2 for digital core logic |
Key Features
| Feature | Design Value |
|---|---|
| Per-pin I/O configuration | Each of 40 I/O pins independently set as input (with weak pull-up), totem-pole output, or open-drain output |
| Edge-triggered interrupt | Rising/falling/both-edge detection per I/O pin feeds single open-drain INT# output | LED flashing control | Seven selectable flash rates (from ~0.2Hz to ~20Hz) generated internally without MCU intervention |
| Programmable fan monitoring | Four independent tach inputs with user-defined RPM overflow thresholds and real-time 16-bit counter readback |
| Flexible PWM generation | Four outputs with 3% duty-cycle resolution and three selectable frequency ranges (low/med/high) per channel |
Applications
| FC-AL Drive Enclosure Control | Multi-Controller I/O Expansion |
|---|---|
Use Scenario: Managing 8-disk FC-AL backplane with port bypass, signal detect, and clock recovery functions. IC Role / Device Role / Timing Role: Backplane controller handling PBC_EN signals, CRU/SDU status, and drive presence detection via Port 3/4. Use Value: Reduces host controller complexity by offloading 8-drive bypass sequencing and fault isolation to VSC050XKM-01's dedicated PBC registers. | Use Scenario: Scaling I/O capacity across 16 VSC050XKM-01 devices on one I²C bus in a high-density storage chassis. IC Role / Device Role / Timing Role: Distributed I/O node providing 40 × 16 = 640 total configurable lines for drive status, temperature sensors, and power sequencing. Use Value: Enables centralized microcontroller management of large-scale enclosures without custom ASICs or FPGA logic. |
| Fan Speed Regulation System | LED Status Indication Subsystem |
Use Scenario: Monitoring and controlling four chassis fans using tach feedback and PWM drive in enterprise server backplane. IC Role / Device Role / Timing Role: Fan controller reading tach pulses on P2.4–P2.7 and generating variable-duty PWM on P2.0–P2.3. Use Value: Delivers closed-loop thermal management with 16-bit RPM resolution and programmable fail thresholds (FSCOx registers). | Use Scenario: Driving 16 LEDs with synchronized flash patterns for drive activity, fault, and power status in rack-mount storage. IC Role / Device Role / Timing Role: LED driver using built-in flash rate generators and open-drain I/O ports (P0–P1) with edge-triggered interrupt for status change alerts. Use Value: Eliminates external timers or MCU polling; enables uniform visual feedback across all 16 LEDs via synchronized clock division. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar backplane controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1232 | Lacks port bypass logic, fan monitoring, and PWM; limited to 8 GPIO with no I²C address expansion | Only suitable for basic thermal monitoring or simple I/O expansion-not FC-AL/SAS enclosure control | Select only if application requires minimal GPIO without PBC/fan/PWM functionality and lower cost is critical |
| TI TCA9534A | 8-bit I²C expander with no fan tach, PWM, PBC, or interrupt edge detection; no register-mapped flash control | Applicable only for low-complexity digital I/O extension where enclosure-specific features are unnecessary | Choose when scaling simple on/off signals only-no support for drive bypass, RPM feedback, or synchronized LED control |
Compared with MAX1232 and TCA9534A, the VSC050XKM-01 uniquely integrates enclosure-specific functions-port bypass control, four-channel tach monitoring, and PWM fan regulation-within a single I²C-addressable device, eliminating need for multiple discrete ICs in FC-AL/SAS storage systems.
Availability
VSC050XKM-01 is available at Aetrix Electronics and suitable for FC-AL drive enclosures, multi-controller I/O expansion systems, and fan speed regulation subsystems requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial storage OEMs.
Supply support for VSC050XKM-01 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
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for industrial, communications, and computing applications.
The VSC050XKM-01 belongs to Maxim's storage infrastructure product line, engineered specifically for intelligent backplane management in Fibre Channel, SCSI, SAS, and SATA storage enclosures.
FAQ
What is the maximum number of VSC050XKM-01 devices supported on a single two-wire serial bus?
The VSC050XKM-01 supports up to 16 devices on one I²C bus using hardware address pins A2–A0 (3-bit) and ASEL (1-bit), yielding 8 × 2 = 16 unique slave addresses. This enables scalable I/O expansion across large storage enclosures without bus contention or address conflicts. Each VSC050XKM-01 retains full register access and independent interrupt capability in multi-device configurations.
Does the VSC050XKM-01 require an external crystal, and what are the clocking options?
Yes, the VSC050XKM-01 requires an external 10.0MHz crystal connected between OSCI and OSCO pins for nominal operation. Alternatively, a 3.3V 10.0MHz CMOS clock source may be applied to OSCI while leaving OSCO unconnected. The internal oscillator supports 8.0–12.5MHz operation; however, fan speed counts, PWM frequencies, and LED flash rates scale linearly with clock deviation from 10.0MHz.
How does the VSC050XKM-01 handle fan speed monitoring and failure detection?
The VSC050XKM-01 provides four dedicated tachometer inputs (P2.4–P2.7) with associated FSCx, FSCOx, and FSCCx registers. Users configure FSCOx with a 16-bit RPM overflow threshold; exceeding this value triggers status flags. FSCCx provides real-time 16-bit pulse count, enabling precise RPM calculation. Digital filters (100–500ns) suppress noise on tach signals, ensuring reliable fan health monitoring in electrically noisy backplane environments.
Can the VSC050XKM-01's I/O pins drive LEDs directly, and what flash control is available?
Yes, any VSC050XKM-01 I/O pin configured as an open-drain output can directly drive LEDs with current-limiting resistors. Seven factory-programmed flash rates (ranging from ~0.2Hz to ~20Hz) are available per pin via bit-control registers-enabling synchronized status indication without MCU intervention. Flash timing derives from the internal 10MHz clock and scales proportionally if a non-nominal crystal frequency is used.
What happens to I/O configuration when port bypass control (PBC) mode is enabled on the VSC050XKM-01?
When PBC mode is activated via PBC0–PBC7 registers, the VSC050XKM-01 overrides normal I/O direction and data settings for affected pins (typically P3.0–P3.7 and P4.0–P4.7). These pins become dedicated to Force Bypass and Signal Detect functions per FC-AL specification. Normal GPD/DDP register writes to those pins are ignored until PBC mode is disabled, ensuring deterministic behavior during drive insertion/removal sequences.
VSC050XKM-01 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 64-LQFP
- Programmable:
- -
- Protocol:
- -
- Function:
- Controller
- Interface:
- Serial
- Standards:
- -
- Voltage - Supply:
- 3V ~ 3.6V
- Current - Supply:
- 50mA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Supplier Device Package:
- 64-LQFP (10x10)
- Grade:
- -
- Qualification:
- -
VSC050XKM-01 FAQ
1.How can I place an order for VSC050XKM-01 through Aetrix?
Please submit a Request for Quotation (RFQ) for VSC050XKM-01 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 VSC050XKM-01 reliable?
The price and inventory of VSC050XKM-01 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VSC050XKM-01 is usually 5 days.
3.What payment methods are accepted for VSC050XKM-01?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VSC050XKM-01 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VSC050XKM-01?
VSC050XKM-01 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VSC050XKM-01 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 VSC050XKM-01?
For technical support, including VSC050XKM-01 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VSC050XKM-01 requirements.
6.How does Aetrix verify that VSC050XKM-01 is sourced from the original manufacturer or authorized distributors?
All VSC050XKM-01 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 VSC050XKM-01 meets industry standards.
7.What is the process for return or replacement of VSC050XKM-01?
All VSC050XKM-01 units undergo pre-shipment inspection (PSI). If there is an issue with VSC050XKM-01, 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 VSC050XKM-01 part is unused and in its original packaging.
Return procedure for VSC050XKM-01:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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