 |
数据搜索系统，热门电子元器件搜索 |
|
|
数据搜索系统，热门电子元器件搜索 |
|
TC654 数据表(PDF) 9 Page - Microchip Technology |
|
|
|||||||||||||||||||||||||||||
TC654 数据表(HTML) 9 Page - Microchip Technology |
|
|
9 / 38 page  2002-2014 Microchip Technology Inc. DS20001734C-page 9 TC654/TC655 4.0 DEVICE OPERATION The TC654 and TC655 devices allow you to control, monitor and communicate (via SMBus) fan speed for 2- wire and 3-wire DC brushless fans. By pulse-width modulating (PWM) the voltage across the fan, the TC654/TC655 controls fan speed according to the sys- tem temperature.The goal of temperature proportional fan speed control is to reduce fan power consumption, increase fan life and reduce system acoustic noise. With the TC654 and TC655 devices, fan speed can be controlled by the analog input VIN or the SMBus inter- face, allowing for high system flexibility. The TC654 and TC655 also measure and monitor fan revolutions per minute (RPM). A fan’s speed (RPM) is a measure of its health. As a fan’s bearings wear out, the fan slows down and eventually stops (locked rotor). By monitoring the fan’s RPM level, the TC654/TC655 devices can detect open, shorted, unconnected and locked rotor fan conditions. The fan speed threshold can be set to provide a predictive fan failure feature. This feature can be used to give a system warning and, in many cases, help to avoid a system thermal shut- down condition. The fan RPM data and threshold reg- isters are available over the SMBus interface which allows for complete system control. The TC654/TC655 devices are identical in every aspect except for how they indicate an over-tempera- ture condition. When VIN voltage exceeds 2.6V (typi- cal), both devices will set OTF (bit 5<X>) in the Status Register to a '1'. The TC655 will additionally pull the FAULT output low during an over-temperature condi- tion. FIGURE 4-1: Typical Application Circuit. 1 2 3 4 5 6 7 8 9 10 VIN CF SCLK SDA GND FAULT SENSE2 SENSE1 VOUT VDD +5V FAN FAN RISO1 RISO2 RSENSE2 RSENSE1 CSENSE2 CSENSE1 12 NTC Thermistor R1 R2 C1 0.01 µF C2 1µF 100 k @ 25°C PIC® Microcontroller +12V +5V +5V +5V +5V 34.8 k 14.7 k CF 1.0 µF RSCLK 20 k RSDA 20 k 715 0.1 µF 0.1 µF 715 RFAULT 20 k Note: Refer to Table 7-1 for RSENSE1 and RSENSE2 values. TC654/TC655 |
|
链接网址 |
| ALLDATASHEET是否为您带来帮助? [ DONATE ] |
关于 Alldatasheet | 广告服务 | 联系我们 | 隐私政策 | 数据表链接 | 链接交换 | 制造商名单 All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
Chinese ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
