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ASC7621

更新时间： 2022-12-20 06:30:31
品牌 Logo 应用领域
其他 - ETC 风扇监控监视器
页数 文件大小 规格书
50页 575K
描述
HARDWARE MONITOR WITH INTEGRATED FAN CONTROL

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ASC7621 数据手册

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aSC7621  
HARDWARE MONITOR  
WITH INTEGRATED FAN CONTROL  
Preliminary Specification  
Product Description  
PRODUCT SPECIFICATION  
Measurement System  
Temperature:  
The aSC7621 has a two wire digital interface compatible  
with SMBus 2.0. Using a 10-bit ΣΔ- ADC, the aSC7621  
measures the temperature of two remote diode connected  
transistors as well as its own die. Support for Platform  
Environmental Control Interface (PECI) is included.  
Using temperature information from these four zones, an  
automatic fan speed control algorithm is employed to  
minimize acoustic impact while achieving recommended  
CPU temperature under varying operational loads.  
•
•
•
0.25°C resolution, ±2°C accuracy on remote diode  
0.25°C resolution, ±3°C accuracy on local sensor  
Temperature measurement range on remote  
sensor –55°C to +125°C using 2’s complement  
coding.  
Voltage:  
•
10-bit Resolution, ±2% (TUE)  
To set fan speed, the aSC7621 has three independent  
pulse width modulation (PWM) outputs that are controlled  
by one, or a combination of three, temperature zones.  
Both high- and low-frequency PWM ranges are supported.  
The aSC7621 also includes a digital filter that can be  
invoked to smooth temperature readings for better control  
of fan speed and minimum acoustic impact. The aSC7621  
has tachometer inputs to measure fan speed on up to four  
fans. Limit and status registers for all measured values are  
included to alert the system host that any measurements  
are outside of programmed limits via status registers.  
Fan Tachometer:  
•
16-bit count of 90kHz clock periods  
Limit alarms for all measured values  
Applications  
•
•
Desktop Computers – Motherboards and Graphics  
Cards  
Microprocessor based equipment (e.g. Base-  
stations, Routers, ATMs, Point of Sales)  
System voltages of VCCP, 2.5V, 3.3V, 5.0V, and 12V  
motherboard power are monitored efficiently with internal  
scaling resistors.  
Connection Diagram  
Features  
•
Supports PECI interface and monitors internal and  
remote thermal diodes  
1
2
SMBDAT  
SMBCLK  
GND  
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
14  
13  
PWM1/  
XTESTOUT  
VCCP  
•
•
•
2-wire, SMBus 2.0 compliant, serial interface  
10-bit ΣΔ-ADC  
3
2.5V  
Monitors VCCP, 2.5V, 3.3V, 5.0V, and 12V  
motherboard/processor supplies  
3.3V  
4
12V  
•
•
Programmable autonomous fan control based on  
temperature readings  
GPIO2  
GPIO1  
PECI  
5
5V  
6
GPIO3  
aSC7621  
Noise filtering of temperature reading for fan  
speed control  
7
REMOTE 1+  
REMOTE 1-  
REMOTE 2+  
REMOTE 2-  
•
•
0.25°C digital temperature sensor resolution  
3 PWM fan speed control outputs for 2-, 3- or 4-  
wire fans and up to 4 fan tachometer inputs  
8
Vtt  
TACH3  
PWM2  
TACH1  
TACH2  
9
10  
11  
12  
•
Enhanced measured temperature to Temperature  
Zone assignment.  
TACH4/  
AddressSelect  
PWM3/  
•
•
•
Provides high and low PWM frequency ranges  
3 GPIO pins for custom use  
AddressEnable  
24-Lead QSOP package  
Ordering Information  
Temperature Range  
and Operating Voltage  
Part Number  
Package  
Marking  
How Supplied  
aSC7621  
Ayww  
aSC7621QS24  
24-lead QSOP  
0°C to +120°C, 3.3V  
2500 units Tape & Reel  
Ayww – Assembly site, year, workweek  
- 1 -  
© Andigilog, Inc. 2006  
www.andigilog.com  
October 2006 - 70A06010  
1234567...50

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