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LTC1840 PDF预览

LTC1840

更新时间： 2024-11-17 22:39:51
品牌 Logo 应用领域
凌特 - Linear 风扇控制器
页数 文件大小 规格书
12页 196K
描述
Dual Fan Controller with 2-Wire Interface

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中文翻译

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LTC1840 数据手册

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LTC1840  
Dual Fan Controller  
with 2-Wire Interface  
U
FEATURES  
DESCRIPTIO  
The LTC®1840 is a fan controller with two 8-bit current  
output DACs, two tachometer interfaces, and four general  
purpose I/O (GPIO) pins. It operates from a single supply  
witharangeof2.7Vto5.75V.AcurrentoutputDACisused  
to control an external switching regulator, which controls  
the fan speed. A current output DAC and tachometer allow  
a controller to form a closed control loop on fan velocity.  
The GPIO pins can be used as digital inputs or open drain  
pull-down outputs.  
The part features a simple 2-wire I2C and SMBus compat-  
ible serial interface that allows communication between  
manydevices.Theinterfaceincludesafaultstatusregister  
that reflects the state of the part and which can be polled  
to find the cause of a fault condition. Other operational  
characteristics of the part, such as DAC output currents,  
GPIO modes, and tachometer frequency, are also pro-  
grammed through the serial interface. Two address pins  
provide nine possible device addresses.  
■
Two 8-Bit Current DACs  
■
DACs Guaranteed Monotonic  
■
Known IC State on Power-Up  
■
Serial Interface Watchdog Timer with Disable  
2-Wire Serial Interface Compatible with I2CTM  
■
and SMBus  
■
2 Programmable Fan Tachometer Interfaces  
■
4 Programmable General Purpose I/Os  
■
Small 16-Pin SSOP Package  
■
Single 2.7V to 5.75V Supply Operation  
■
Fault Output Signal  
■
Status Register  
■
Fan Blasting Function  
■
Nine Addresses Using Two Programming Lines  
U
APPLICATIO S  
■
Servers  
■
Desktop Computers  
■
The BLAST pin is provided to force the DAC output  
currents to program the maximum regulator output  
voltages through a single pin and gate the operation of the  
serial access timer.  
Power Supplies  
Cooling Systems  
■
, LTC and LT are registered trademarks of Linear Technology Corporation.  
I2C is a trademark of Philips Electronics N.V.  
U
TYPICAL APPLICATIO  
Low Parts Count, High Efficiency Dual Fan Control  
3.3V  
12V  
+
3.3V  
10k  
0.1µF  
10µF  
+
R
C
VIN1  
22µF  
SENSE1  
0.05Ω  
3.3V  
10k  
V
CC  
V
IN  
RUN/SS SENSE  
LTC1771  
FAULT  
SDA  
GPI04  
BLAST  
DC  
R
FB1A  
FAN  
75k  
TO  
MASTER  
SYSTEM  
RESET  
+
I
TH  
PGATE  
Si6447DQ  
L1 47µH  
C
OUT1  
150µF  
TACH  
OUT  
R
C1  
10k  
R
FB1B  
V
FB  
MODE  
SCL  
IDACOUTA  
28k  
C
C
C1  
220pF  
FB1  
100pF  
GND  
UPS5817  
LTC1840  
12V  
2-NMB 6820PL-04W-B29-D50 FANS  
1.1A NOM AT 12V  
3.3V  
3.3V  
+
C
R
VIN2  
SENSE2  
0.05Ω  
V
IN  
22µF  
3.3V  
RUN/SS SENSE  
LTC1771  
NC  
NC  
A0  
GPI03  
IDACOUTB  
TACHB  
130Ω  
DC  
R
FB2A  
10k  
FAN  
75k  
+
I
TH  
PGATE  
A1  
Si6447DQ  
L2 47µH  
130Ω  
C
OUT2  
150µF  
LED1  
TACH  
OUT  
R
C2  
10k  
R
FB2B  
V
FB  
MODE  
GPI01  
GPI02  
LED2  
28k  
C
C
C2  
220pF  
FB2  
100pF  
GND  
UPS5817  
TACHA  
GND  
ADDRESS = 1110010  
(8 OTHERS POSSIBLE)  
1840 TA01  
1840f  
1
1234567...12

中文翻译

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