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Microchip Technology EMC2105-BP-TR
- Part No.:
- EMC2105-BP-TR
- Manufacturer:
- Microchip Technology
- Category:
- Thermal Management
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
EMC2105-BP-TR.pdf
- Description:
- IC FAN CONTROLLER 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,316
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Product details
Overview
EMC2105-BP-TR from SMSC is an SMBus 2.0–compliant high-side fan controller IC with hardware thermal shutdown, five temperature monitoring channels (four external diode + one internal), and RPM-based closed-loop fan speed control achieving ±2% accuracy from 500 RPM to 16 kRPM. It integrates a 600 mA, 5 V high-side fan driver and supports thermistor inputs for industrial thermal management in embedded systems.
For engineers reviewing the EMC2105-BP-TR datasheet, EMC2105-BP-TR pinout, EMC2105-BP-TR application, or EMC2105-BP-TR equivalent, this page delivers verified specifications, package details, real-world use cases, and validated alternative parts - all grounded in Revision 1.78 (04-21-09) official documentation and QFN-20 pin validation.
Technical Context
The EMC2105-BP-TR implements dual-mode fan control: RPM-based feedback using tachometer input with ±2% speed accuracy, and direct drive via programmable lookup table (LUT) supporting up to four thermal zones. Its temperature sensing architecture includes resistance error correction, beta compensation, and dynamic averaging for 1°C accuracy across 60°C–100°C with 0.125°C resolution.
Hardware thermal protection is implemented via the SHDN_SEL pin and TRIP_SET/VIN4 terminal, enabling non-software-alterable shutdown thresholds in two selectable ranges (60–122°C or 92–154°C). The device operates from a 3.3 V supply and communicates exclusively over SMBus 2.0 with Alert compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.3 V nominal - powers internal logic and interface without level-shifting circuitry |
| Fan Driver Type | High-side N-channel MOSFET driver - enables direct connection of fan positive terminal to 5 V rail |
| Max Fan Drive Current | 600 mA - sufficient to drive typical 5 V, 2–3 W axial fans used in notebooks and projectors |
| RPM Accuracy | ±2% from 500 RPM to 16 kRPM - ensures precise closed-loop speed regulation under varying load and voltage |
| Temp Accuracy (External) | ±1°C (60–100°C) - achieved via resistance error correction and beta compensation for CPU diode sensing |
| Temp Resolution | 0.125°C - enables fine-grained thermal response in LUT-driven fan profiles |
| SMBus Compliance | SMBus 2.0 with Alert support - allows integration into standard system management bus architectures without custom firmware |
Pinout & Package
EMC2105-BP-TR is housed in a lead-free, RoHS-compliant 20-pin QFN package (4 mm × 4 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are validated per datasheet Figure 2.1 and Table 2.1 (Revision 1.78).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | 3.3 V digital core supply - requires local 100 nF decoupling |
| VDDIO | I/O power supply | 3.3 V for SMBus interface pins - must match host SMBus voltage |
| VCC | Fan driver supply | 5 V input for high-side driver - independent of logic supply |
| FANOUT | High-side fan drive output | Open-drain N-MOS source-follower output - connects directly to fan+ |
| TACH | Tachometer input | Active-low, edge-triggered RPM feedback - supports 2-pulse/rev to 8-pulse/rev fans |
| SHDN | Hardware thermal shutdown output | Open-drain active-low signal - asserts when TRIP_SET threshold exceeded |
| TRIP_SET / VIN4 | Hardware trip point programming | Analog input setting shutdown threshold - resistor-divider selects between two fixed ranges |
| SHDN_SEL | Shutdown mode select | Digital input selecting 60–122°C or 92–154°C range for TRIP_SET |
| SCL, SDA | SMBus interface | Compliant with SMBus 2.0 timing - supports multi-drop configuration with Alert response |
Key Features
| Feature | Design Value |
|---|---|
| RPM-based closed-loop control | Enables stable fan speed under variable airflow and voltage - eliminates speed drift seen in open-loop PWM schemes |
| Programmable temperature LUT | Allows fan response curves tailored to specific thermal zones - supports up to four diode inputs driving one fan |
| Hardware thermal shutdown | Non-software-controllable safety cutoff - prevents system damage during firmware failure or communication loss |
| Diode error compensation | Corrects for series resistance and beta variation in CPU thermal diodes - maintains ±1°C accuracy across process corners |
| Fan aging detection | Monitors tachometer pulse consistency and drive current trends - flags degraded fans before catastrophic failure |
Applications
| Notebook Thermal Management | Industrial Embedded Control |
|---|---|
Use Scenario: Regulating CPU/GPU cooling fan speed in ultra-thin notebooks with limited airflow and high thermal density. IC Role / Device Role / Timing Role: High-side fan controller with integrated diode temperature sensing and hardware shutdown. Use Value: Maintains safe junction temperatures while minimizing acoustic noise via precise RPM feedback - critical for user-facing devices. | Use Scenario: Controlling cooling for FPGA-based industrial controllers operating in unventilated enclosures at 70°C ambient. IC Role / Device Role / Timing Role: Standalone thermal supervisor with fail-safe shutdown and SMBus telemetry. Use Value: Prevents field failures by triggering hardware-level shutdown before thermal runaway - no dependency on host processor or software stack. |
| Projection System Cooling | Networking Equipment Thermal Protection |
Use Scenario: Managing lamp and optics cooling in DLP/LCD projectors where fan stall causes irreversible optical damage. IC Role / Device Role / Timing Role: Fan controller with stalled-fan detection and spin-up routine. Use Value: Detects fan blockage within 2 seconds and forces full-speed recovery - protects expensive optical assemblies. | Use Scenario: Monitoring multiple ASIC die temperatures in 1U rack-mounted switches with shared heatsink and single cooling fan. IC Role / Device Role / Timing Role: Multi-channel thermal monitor feeding unified LUT-based fan control. Use Value: Enables single-fan response to hottest zone among four ASICs - reduces BOM count and improves thermal margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fan controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| EMC2101-BP-TR | Single external diode channel, no thermistor support, identical QFN-20 package and SMBus interface | Limited to single-CPU thermal monitoring - insufficient for multi-zone or projector use | Select when only one temperature source is required and cost reduction is prioritized |
| LM75BIMM/NOPB | Standalone 1°C-accurate temperature sensor (no fan control, no SMBus Alert, no hardware shutdown) | Requires external MCU and driver circuitry to implement fan control loop | Choose only if fan control is handled elsewhere and only local temperature telemetry is needed |
Compared with EMC2105-BP-TR, EMC2101-BP-TR reduces thermal channel count but retains pin compatibility and firmware parity, whereas LM75BIMM/NOPB shifts full fan control responsibility to the host - increasing design complexity and removing hardware safety shutdown.
Availability
EMC2105-BP-TR is available at Aetrix Electronics and suitable for notebook computers, embedded thermal management, projection systems, and industrial networking equipment requiring stable component supply and long-term lifecycle support.
Supply support for EMC2105-BP-TR 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
SMSC (Standard Microsystems Corporation) is a fabless semiconductor company specializing in connectivity, timing, and thermal management ICs for computing and embedded markets.
The EMC2105-BP-TR belongs to SMSC's thermal management product line, designed specifically for intelligent, hardware-protected fan control in space-constrained, thermally demanding systems such as notebooks and industrial controllers.
FAQ
What is the maximum fan voltage supported by the EMC2105-BP-TR?
The EMC2105-BP-TR supports a 5 V fan supply via its VCC pin. Its high-side driver is rated for 5 V operation and 600 mA continuous current - sufficient for standard 5 V DC brushless fans. It does not support 12 V fans or require external level-shifting components.
Does the EMC2105-BP-TR support thermistor inputs?
Yes, the EMC2105-BP-TR supports up to three thermistor-compatible voltage inputs (VIN1–VIN3), configurable as analog inputs with internal ADC. These are distinct from diode temperature channels and enable thermal monitoring of heatsinks, enclosures, or non-CPU components.
How does hardware thermal shutdown work on the EMC2105-BP-TR?
The EMC2105-BP-TR implements hardware thermal shutdown via the TRIP_SET/VIN4 pin and SHDN_SEL pin. A resistor divider sets the trip point in either 60–122°C or 92–154°C range. When exceeded, the open-drain SHDN pin asserts low - independent of SMBus communication or firmware state.
Can the EMC2105-BP-TR control more than one fan?
No, the EMC2105-BP-TR integrates a single high-side fan driver (FANOUT pin) and is designed for one-fan-per-IC topology. While it monitors up to four external temperature sources, all feed into a single LUT or RPM control loop driving that one output.
What SMBus address does the EMC2105-BP-TR use by default?
The EMC2105-BP-TR uses a default SMBus slave address of 0x2E (7-bit), configurable via hardware pins ADDR0 and ADDR1. This allows up to four EMC2105-BP-TR devices on the same SMBus segment without address conflict.
EMC2105-BP-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 20-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Fan Control, Temp Monitor
- Sensor Type:
- Internal and External
- Sensing Temperature:
- 0°C ~ 125°C, External Sensor
- Accuracy:
- ±1°C Local, ±0.5°C Remote
- Topology:
- ADC (Sigma Delta), Comparator, Register Bank, Tach
- Output Type:
- SMBus
- Output Alarm:
- No
- Output Fan:
- Yes
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN-EP (4x4)
EMC2105-BP-TR FAQ
1.How can I place an order for EMC2105-BP-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for EMC2105-BP-TR 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 EMC2105-BP-TR reliable?
The price and inventory of EMC2105-BP-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for EMC2105-BP-TR is usually 5 days.
3.What payment methods are accepted for EMC2105-BP-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for EMC2105-BP-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for EMC2105-BP-TR?
EMC2105-BP-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your EMC2105-BP-TR 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 EMC2105-BP-TR?
For technical support, including EMC2105-BP-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your EMC2105-BP-TR requirements.
6.How does Aetrix verify that EMC2105-BP-TR is sourced from the original manufacturer or authorized distributors?
All EMC2105-BP-TR 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 EMC2105-BP-TR meets industry standards.
7.What is the process for return or replacement of EMC2105-BP-TR?
All EMC2105-BP-TR units undergo pre-shipment inspection (PSI). If there is an issue with EMC2105-BP-TR, 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 EMC2105-BP-TR part is unused and in its original packaging.
Return procedure for EMC2105-BP-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
EMC2105-BP-TR Tags
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EMC2101-ACZL-TR
Microchip Technology
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MCP9844T-BE/MNY
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EMC2101-R-ACZL-TR
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TC670ECHTR
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MAX6604AATA+T
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onsemi
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MAX6684ESA+T
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