LTC1840
Info: : PRODUCTION
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LTC1840

Dual Fan Controller with 2-Wire Interface

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Info: : PRODUCTION tooltip
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Part Details
Part Models 4
1ku List Price Starting From $3.31
Features
  • 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 I2C 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
Additional Details
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The LTC1840 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 I²C and SMBus compatible 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 programmed 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.

Applications

  • Servers
  • Desktop Computers
  • Power Supplies
  • Cooling Systems
Part Models 4
1ku List Price Starting From $3.31

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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Product Lifecycle

PCN

Oct 11, 2022

- 22_0235

Epoxy Change from Henkel 8290 to 8290A for GN Package

LTC1840CGN#PBF

PRODUCTION

LTC1840CGN#TRPBF

PRODUCTION

LTC1840IGN#PBF

PRODUCTION

LTC1840IGN#TRPBF

PRODUCTION

Apr 6, 2022

- 22_0066

Laser Top Mark for 16QSOP Assembled in ADPG [PNG]

LTC1840CGN#PBF

PRODUCTION

LTC1840CGN#TRPBF

PRODUCTION

LTC1840IGN#PBF

PRODUCTION

LTC1840IGN#TRPBF

PRODUCTION

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Oct 11, 2022

- 22_0235

arrow down

Epoxy Change from Henkel 8290 to 8290A for GN Package

LTC1840CGN#PBF

PRODUCTION

LTC1840CGN#TRPBF

PRODUCTION

LTC1840IGN#PBF

PRODUCTION

LTC1840IGN#TRPBF

PRODUCTION

Apr 6, 2022

- 22_0066

arrow down

Laser Top Mark for 16QSOP Assembled in ADPG [PNG]

LTC1840CGN#PBF

PRODUCTION

LTC1840CGN#TRPBF

PRODUCTION

LTC1840IGN#PBF

PRODUCTION

LTC1840IGN#TRPBF

PRODUCTION

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