FAN31790
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Fan Control and Monitoring
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Control up to 6 fans with 9-bit PWM Drive, Customizable PWM Dutycycle Rate-of-change, and PWM Frequencies from 25Hz to 25kHz
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Up to 12, 11-bit Tachometer Inputs for speed and failure detection
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Automatic Fan Speed Control Loops, RPM control on fans with digital tachometer outputs
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High System Reliability
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Fan failure/fault detection with automatic safe state responses.
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Power-up defaults are hardware selectable. Default PWM frequency, duty cycle, and start-up speed can be set by external pin connections.
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Integrated Watchdog Timer
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I2C Communication interface
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Fast-mode I2C controller up to 400kbps
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Open-drain pins
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16 possible hardware-selectable addresses
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Operating characteristics
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Wide supply voltage range: 1.62V to 3.6V
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Extended temperature: –40°C up to 125°C
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Clock system
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Internal 32kHz oscillator with ±5% accuracy
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External 32kHz crystal oscillator (LFXT)
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32.768kHz Digital clock output
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Package
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Bom-to-BOM and Pin-to-pin with common fan controllers
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28 pin LGA 4x4mm (Identical footprint to WQFN 4x4mm)
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RoHS Compliant
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The FAN31790 is an intelligent fan controller that can control the speed of six fans using independent PWM outputs and dedicated TACH inputs. The device is designed for 4-wire fans but can still be used to modulate the speed of 3-wire and 2-wire fans via external power transistors. The device can monitor the speed of up to 12 fans with six dedicated tachometer inputs and any of the PWM output channels can be reconfigured as additional tachometers. Using a tachometer allows the device to automatically adjust the PWM duty cycles to maintain desired fan speeds. Target fan speeds and update rates can be configured via an I2C interface.
This device’s default power-up states are hardware configurable with external connections. The fan spin-up behavior, PWM frequency, PWM duty cycle, and the integrated watchdog timer can all be configured via pin configurations. This allows customization of fan behavior before custom settings are loaded via the I2C bus.
The FAN31790 supports a 1.62-3.6V supply voltage for PWM/TACH pins and the I2C interface. The FAN31790 is designed to be pin-to-pin and BOM-to-BOM compatible with common fan controllers and it offers a matching I2C interface and register map to leverage any pre-existing software drivers.
技術文件
| 重要文件 | 類型 | 標題 | 格式選項 | 日期 |
|---|---|---|---|---|
| * | Data sheet | FAN31790 6-Channel PWM/RPM Fan Controller datasheet | PDF | HTML | 2026年 4月 29日 |
| Application brief | Migration Guide to FAN31790 from MAX31790 | PDF | HTML | 2026年 4月 28日 |
設計與開發
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| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| LGA (ZFP) | 28 | Ultra Librarian |
訂購與品質
- RoHS
- REACH
- 產品標記
- 鉛塗層/球物料
- MSL 等級/回焊峰值
- MTBF/FIT 估算值
- 材料內容
- 認證摘要
- 進行中的可靠性監測
- 晶圓廠位置
- 組裝地點
建議產品可能具有與此 TI 產品相關的參數、評估模組或參考設計。