- 您现在的位置：买卖IC网 > PDF目录298953 > CMX644AD2 (CML MICROSYSTEMS PLC) 1.2 kbps DATA, MODEM, PDSO24 PDF资料下载
参数资料
| 型号： | CMX644AD2 |
| 厂商： | CML MICROSYSTEMS PLC |
| 元件分类： | 调制器/解调器 |
| 英文描述： | 1.2 kbps DATA, MODEM, PDSO24 |
| 封装： | SOIC-24 |
| 文件页数： | 24/34页 |
| 文件大小： | 1174K |
| 代理商： | CMX644AD2 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页当前第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页
RPM-Based Fan Controller with HW Thermal Shutdown
Datasheet
Revision 0.90 (08-19-08)
30
SMSC EMC2103
DATASHEET
7. Set the LUT_LOCK bit to enable the Look Up Table and begin fan control in the Fan LUT
Configuration Register.
5.4.2
DTS Support
The EMC2103 supports DTS (Intel’s Digital Temperature Sensor) data in the Fan Control Look Up
Table. Intel’s DTS data is a positive number that represents the processor’s relative temperature below
a fixed value called TCONTROL which is generally equal to 100°C for Intel Mobile processors. For
example, a DTS value of 10°C means that the actual processor temperature is 10°C below TCONTROL
or equal to 90°C.
Either or both of the Pushed Temperature Registers can be written with DTS data and used to control
the fan driver. When DTS data is entered, then the USE_DTS_Fx bit must be set in the Fan LUT
Configuration register. Once this bit is set, the DTS data entered is automatically subtracted from a
value of 100°C. This delta value is then used in the Look Up Table as standard temperature data.
APPLICATION NOTE: The device is designed with the assumption that TCONTROL is 100°C. As such, all DTS
related conversions are done based on this value including Look Up Table comparisons. If
TCONTROL is adjusted (i.e. TCONTROL is shifted to 105°C), then all of the Look Up Table
thresholds should be adjusted by a value equal to TCONTROL - 100°C.
5.5
RPM based Fan Speed Control Algorithm (FSC)
The EMC2103 includes an RPM based Fan Speed Control Algorithm.
This fan control algorithm uses Proportional, Integral, and Derivative terms to automatically approach
and maintain the system’s desired fan speed to an accuracy directly proportional to the accuracy of
the clock source. Figure 5.4 shows a simple flow diagram of the RPM based Fan Speed Control
Algorithm operation.
The desired tachometer count is set by the user inputting the desired number of 32.768KHz cycles
that occur per fan revolution. This is done by either manually setting the TACH Target Register or by
programming the Temperature Look-Up Table. The user may change the target count at any time. The
user may also set the target count to FFh in order to disable the fan driver for lower current operation.
For example, if a desired RPM rate for a 2-pole fan is 3000 RPM then the user would input the
hexidecimal equivalent of 1296 (51h in the TACH Target Register). This number represents the number
of 32.768KHz cycles that would occur during the time it takes the fan to complete a single revolution
when it is spinning at 3000RPMs. See Section 6.30 for RPM -> TACH calculations or Appendix B for
a complied table showing this information (for default conditions).
The EMC2103’s RPM based Fan Speed Control Algorithm has programmable configuration settings
for parameters such as ramp-rate control and spin up conditions. The fan driver automatically detects
and attempts to alleviate a stalled/stuck fan condition while also asserting the ALERT pin. The
EMC2103 works with fans that operate up to 16,000 RPMs and provides a valid tachometer signal.
相关PDF资料 |
PDF描述 |
|---|---|
| CMX644AD5 | 1.2 kbps DATA, MODEM, PDSO24 |
| CMY211E6327 | 500 MHz - 2500 MHz RF/MICROWAVE DOUBLE BALANCED MIXER |
| CMZ5914BPTR13 | 3.6 V, 0.55 W, SILICON, UNIDIRECTIONAL VOLTAGE REGULATOR DIODE |
| CMZ5950BP | 110 V, 0.55 W, SILICON, UNIDIRECTIONAL VOLTAGE REGULATOR DIODE |
| CN201J1AS215DQ7 | Double Pole Power Rocker Switches |
相关代理商/技术参数 |
参数描述 |
|---|---|
| CMX644AD5 | 制造商:CML Innovative Technologies 功能描述:V22 AND Bell 212A Modem with DTMF, Tube |
| CMX649 | 制造商:CMLMICRO 制造商全称:CML Microcircuits 功能描述:ADM Codec |
| CMX649E3 | 制造商:CML Innovative Technologies 功能描述:Adaptive Delta Modulation (ADM) Voice Codec, Tube |
| CMX654 | 制造商:CMLMICRO 制造商全称:CML Microcircuits 功能描述:V23 Transmit Modulator |
| CMX661 | 制造商:CMLMICRO 制造商全称:CML Microcircuits 功能描述:The Product Data Amendment series of documents |
发布紧急采购，3分钟左右您将得到回复。