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LTC1840IGN Datasheet

  • LTC1840IGN

  • Dual Fan Controller with 2-Wire Interface

  • 12頁

  • LINER

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LTC1840
Dual Fan Controller
with 2-Wire Interface
FEATURES
s
s
s
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
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 I
2
C
TM
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
The LTC
廬
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
with a range of 2.7V to 5.75V. A current output DAC is used
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 I
2
C and SMBus compat-
ible serial interface that allows communication between
many devices. The interface includes a fault status register
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.
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.
APPLICATIO S
s
s
s
s
Servers
Desktop Computers
Power Supplies
Cooling Systems
, LTC and LT are registered trademarks of Linear Technology Corporation.
I
2
C is a trademark of Philips Electronics N.V.
TYPICAL APPLICATIO
3.3V
3.3V
10k
FAULT
TO
MASTER
SDA
SCL
V
CC
Low Parts Count, High Efficiency Dual Fan Control
+
10碌F
12V
0.1碌F
V
IN
GPI04
BLAST
IDACOUTA
SYSTEM
RESET
RUN/SS SENSE
LTC1771
PGATE
I
TH
R
C1
10k
C
C1
220pF
V
FB
C
FB1
100pF
MODE
GND
UPS5817
R
SENSE1
0.05鈩?/div>
+
C
VIN1
22碌F
R
FB1A
75k
Si6447DQ
L1 47碌H
LTC1840
3.3V
12V
V
IN
R
SENSE2
0.05鈩?/div>
+
3.3V
130鈩?/div>
LED2
C
VIN2
22碌F
130鈩?/div>
LED1
NC
NC
A0
A1
GPI01
GPI02
GND
GPI03
IDACOUTB
TACHB
TACHA
R
C2
10k
C
C2
220pF
RUN/SS SENSE
LTC1771
I
TH
PGATE
V
FB
C
FB2
100pF
MODE
GND
Si6447DQ
L2 47碌H
UPS5817
ADDRESS = 1110010
(8 OTHERS POSSIBLE)
U
3.3V
DC
FAN
C
OUT1
150碌F
10k
TACH
OUT
U
U
+
R
FB1B
28k
2-NMB 6820PL-04W-B29-D50 FANS
1.1A NOM AT 12V
3.3V
R
FB2A
75k
R
FB2B
28k
DC
FAN
C
OUT2
150碌F
10k
TACH
OUT
+
1840 TA01
1840f
1

LTC1840IGN 產(chǎn)品屬性

  • LTC1840

  • 100

  • 集成電路 (IC)

  • PMIC - 電機和風扇控制器，驅動器

  • -

  • 風扇控制器

  • -

  • 2

  • 10mA

  • -

  • 2.7 V ~ 5.75 V

  • -40°C ~ 85°C

  • 表面貼裝

  • 16-SSOP（0.154"，3.90mm 寬）

  • 16-SSOP

  • 管件

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