TC654
The TC654 is a dual PWM mode fan speed controller with FanSense™ TM technology for use with brush-less DC motors. The device allows temperature proportional speed control and therefore accomplishes lower acoustic fan noise and longer fan life. The TC654 reads the voltage provided by an external ther-mistor (or voltage output temperature sensor) and adjusts a 30% to 100% PWM duty cycle output to the fan with respect to the input temperature voltage. The PWM duty cycle can also be programmed via SMBus to allow fan speed control without the need of an external thermistor.
In normal fan operation, pulse trains are present at the SENSE pin. These pulses are used to calculate the fan RPM. The fan RPM data is used to detect a worn out, stalled, open or unconnected fan. An RPM level below the user-programmable threshold causes the TC654 to assert a logic low alert signal (FAULT). Thedefault value is 500RPM. The TC654 consumes only 0.3mA during operation and can also enter a low-power shutdown mode by setting the appropriate bit in the configuration register.
Features
| Parameter
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Documents
| TC654/TC655 Data Sheet | Data Sheets | 08/07/2014 | 571KB | |
| AN767 - Interfacing Microchip’s Fan Speed Controllers to a SPI™ | AppNote | 11/12/2002 | 202KB |  |
| Analog & Interface Guide (Volume 2) | Brochures | 10/11/2005 | 1067KB | |
| Quick Guide to Microchip Development Tools | Brochures | 10/15/2014 | 11223KB | |
| Fan Control Function Pack Design Guide | Product Line Documents | 08/23/2006 | 162KB | |
| Fan Management Solutions Product Overview | Product Line Documents | 08/23/2006 | 87KB | |
| Fan Speed Controller and Fan Fault Detector Family | Product Line Documents | 05/13/2003 | 245KB | |
| TC65X Fan Speed Controller Family | Product Line Documents | 10/22/2002 | 62KB | |
| Analog & Interface Product Selector Guide | Product Line Card | 03/21/2016 | 4116KB |
Ordering Information
| Part Number | Leads | Package Type | Temp Range | Packing | 1+ | 26+ | 100+ | 1000+ | 5000+ |
|---|---|---|---|---|---|---|---|---|---|
| TC654EUN | 10 | MSOP | -40C to +85C | TUBE | 2.00 | 1.67 | 1.52 | 1.47 | 1.45 |
| TC654EUNTR | 10 | MSOP | -40C to +85C | T/R | 2.00 | 1.67 | 1.52 | 1.47 | 1.45 |
Similar Devices
| Product | Description | Typical Accuracy (º) | Temp Range | Price5K |
|---|---|---|---|---|
| EMC2101 | ±0.5 | -40 - +125 | $0.79 | |
| EMC2300 | ±0.25 | 0 - 70 | $1.24 | |
| EMC6D102 | ±0.25 | 0 - 70 | $1.63 | |
| EMC6D103 | ±0.25 | 0 - 70 | $1.80 | |
| EMC6D103S | ±0.25 | 0 - 70 | $1.80 | |
| EMC6W201 | ±0.25 | 0 - 70 | $2.19 | |
| TC642 | Fan Manager | Depends on external thermistor | -40 - +85 | $1.02 |
| TC642B | Fan Manager | Depends on external thermistor | -40 - +85 | $0.84 |
| TC646 | Fan Manager | Depends on external thermistor | -40 - +85 | $1.02 |
| TC646B | Fan Manager | Depends on external thermistor | -40 - +85 | $0.84 |
| TC647 | Fan Manager | Depends on external thermistor | -40 - +85 | $0.94 |
| TC647B | Fan Manager | Depends on external thermistor | -40 - +85 | $0.84 |
| TC648 | Fan Manager | Depends on external thermistor | -40 - +85 | $0.85 |
| TC648B | Fan Manager | Depends on External Thermistor | -40 - +85 | $0.79 |
| TC649 | Fan Manager | Depends on external thermistor | -40 - +85 | $0.94 |
| TC649B | Fan Manager | Depends on external thermistor | -40 - +85 | $0.84 |
| TC650 | Fan Manager | 1 | -40 - +125 | $1.26 |
| TC651 | Fan Manager | 1 | -40 - +125 | $1.08 |
| TC652 | Fan Manager | 1 | -40 - +125 | $1.36 |
| TC653 | Fan Manager | 1 | -40 - 125 | $1.36 |
| TC654 | Dual SMBus Fan Manager | Depends on external thermistor | -40 - +85 | $1.43 |
| TC655 | Dual SMBus Fan Manager | Depends on external thermistor | -40 - +85 | $1.53 |
| TC664 | Single SMBus Fan Manager | Depends on external thermistor | -40 - +85 | $1.27 |
| TC665 | Single SMBus Fan Manager | Depends on external thermistor | -40 - +85 | $1.31 |
| TC670 | Predictive Fan Fault Detector | N/A | -40 - +85 | $0.94 |
RoHS Information
| PartNumber | DeviceWeight | ShippingWeight | LeadCount | PackageType | PackageWidth | SolderComposition | JEDECIndicator | RoHS | ChinaEFUP |
|---|---|---|---|---|---|---|---|---|---|
| TC654EUN | 0.023200 | 0.060000 | 10 | MSOP | 3x3mm | Matte Tin | e3 |  |  |
| TC654EUNTR | 0.023200 | 0.200000 | 10 | MSOP | 3x3mm | Matte Tin | e3 | | |
- TC654/TC655 Data Sheet TC655
- AN767 TC654
- Analog & Interface Guide (Volume 2) MCP23S08
- Quick Guide to Microchip Development Tools ENC28J60
- Fan Control Function Pack Design Guide TC670
- Fan Management Solutions Product Overview TC670
- Fan Speed Controller and Fan Fault Detector Family TC665
- TC65X Fan Speed Controller Family TC654
- Analog & Interface Product Selector Guide ENC624J600
