 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
ADT7467ARQZ-R7 Datasheet(PDF) 38 Page - ON Semiconductor |
|
|
|||||||||||||||||||||||||||||
ADT7467ARQZ-R7 Datasheet(HTML) 38 Page - ON Semiconductor |
|
|
38 / 77 page  ADT7467 Rev. 3 | Page 38 of 77 | www.onsemi.com PROGRAMMING THE AUTOMATIC FAN SPEED CONTROL LOOP To more efficiently understand the automatic fan speed control loop, it is strongly recommended to use the ADT7467 evaluation board and software while reading this section. This section provides the system designer with an understand- ing of the automatic fan control loop and provides step-by-step guidance on effectively evaluating and selecting critical system parameters. To optimize the system characteristics, the designer should consider several aspects of the system configuration, including the number of fans, where fans are located, and what temperatures are measured. The mechanical or thermal engineer who is tasked with the system thermal characterization should also be involved at the beginning of the process. STEP 1: HARDWARE CONFIGURATION The motherboard sensing and control capabilities should be addressed in the early stages of designing a system, and decisions about how these capabilities are used should involve the system’s thermal/mechanical engineer. Ask the following questions: 1. What ADT7467 functionality will be used? • PWM2 or SMBALERT • TACH4 fan speed measurement or overtemperature THERM function • 5 V voltage monitoring or overtemperature THERM function • 12 V voltage monitoring or VID5 input The ADT7467 offers multifunctional pins that can be reconfigured to suit different system requirements and physical layouts. These multifunction pins are software programmable. 2. How many fans will be supported in the system, three or four? This influences the choice of whether to use the TACH4 pin or to reconfigure it for the THERM function. 3. Will the CPU fan be controlled using the ADT7467, or will it run at full speed 100% of the time? Running it at 100% frees up a PWM output, but the system is louder. 4. Where will the ADT7467 be physically located in the system? This influences the assignment of the temperature measure- ment channels to particular system thermal zones. For example, locating the ADT7467 close to the VRM controller circuitry allows the VRM temperature to be monitored using the local temperature channel. REAR CHASSIS FRONT CHASSIS CPU FAN SINK REMOTE 1 = AMBIENT TEMP LOCAL = VRM TEMP REMOTE 2 = CPU TEMP PWM1 PWM2 TACH1 TACH2 TACH3 PWM3 MUX THERMAL CALIBRATION 0% TMIN TRANGE THERMAL CALIBRATION 100% 0% TMIN TRANGE THERMAL CALIBRATION 100% 0% TMIN TRANGE TACHOMETER 1 MEASUREMENT PWM CONFIG PWM MIN RAMP CONTROL (ACOUSTIC ENHANCEMENT) PWM GENERATOR TACHOMETER 2 MEASUREMENT PWM CONFIG PWM MIN RAMP CONTROL (ACOUSTIC ENHANCEMENT) PWM GENERATOR TACHOMETER 3 AND 4 MEASUREMENT PWM CONFIG PWM MIN RAMP CONTROL (ACOUSTIC ENHANCEMENT) PWM GENERATOR 100% Figure 53. Hardware Configuration Example |
|
Link URL |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link to Datasheet | Link Exchange | Manufacturer List 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 |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
