LTC1840CGN

Series: -
Mounting Type: Surface Mount
Evaluation Tools: -
Voltage - Load: -
Packaging: Tube
Number of Outputs: 2
Operating Temperature: 0°C ~ 70°C
Applications: Fan Controller
Current - Output: 10mA
Manufacturer: Linear Technology
Supplier Device Package: 16-SSOP
Package / Case: 16-SSOP (0.154", 3.90mm Width)
Voltage - Supply: 2.7 V ~ 5.75 V


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 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


Application

Servers
Desktop Computers
Power Supplies
Cooling Systems


Pinout




Specifications

VCC to GND .................................................... 0.3 to 6V
A0, A1 ............................................. 0.3 to (VCC + 0.3V)
IDACOUTA, IDACOUTB ................... 0.3 to (VCC + 0.75V)
All other pins ................................................. 0.3 to 6V
Operating Temperature
LTC1840C ............................................... 0°C to 70°C
LTC1840I.............................................40°C to 85°C
Storage Temperature Range ..............65°C to 125°C
Lead Temperature (Soldering, 10 sec).................. 300°C


Description

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 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 of LTC1840 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 of LTC1840 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.



Parameters: 

Technical/Catalog Information
LTC1840CGN
Vendor
Linear Technology
Category
Integrated Circuits (ICs) 
  
Applications
Fan Controller
Number of Outputs
2
Voltage - Supply
2.7 V ~ 5.75 V
Voltage - Load
-
Current - Output
10mA
Operating Temperature
0°C ~ 70°C
Package / Case
16-SSOP
Packaging
Tube
Drawing Number
161; 05-08-1641; GN; 16. 28
  
Lead Free Status
Contains Lead
  
RoHS Status
RoHS Non-Compliant
 
  
Other Names
  
            LTC1840CGN
      LTC1840CGN