DS1780 CPU Peripheral Monitor

Description

The DS1780 is a highly integrated system instrumentation monitor that is ideal for use in personal computers or any microprocessor-based system. It monitors temperature (±2°C accuracy from -25°C to +100°C), six power supply voltages, and the speed of two fans. Fan speed can also be controlled using the DS1780's internal 8-bit DAC. All measurements are internally converted to a digital format for easy processing by the CPU.

The DS1780 can be reset to its default power-up state through a remote reset function that has internal debounce and delay. The DS1780 also features an interrupt function that can be programmed to become active should any of the monitored parameters fall out of spec. For board-level testability, an internal NAND TREE function simplifies system design, and a chassis intrusion input enhances system security.

Programming and data readout are accessed through a simple 2-wire interface with 2-bit addressability. The DS1780 power supply range of 2.8V to 5.75V allows parameter monitoring for 3V or 5V systems. The DS1780 is assembled in a 24-pin 173mil TSSOP package (DS1780E).

Key Features

Applications/Uses

±2°C accuracy (from -25°C to +100°C) 9-bit digital thermometer
Six 8-bit ADC channels for monitoring PC power supplies
Two tachometer inputs
8-bit DAC for fan speed control
Maskable system interrupt for all measured parameters (temperature, voltage, fan speed, intrusion detect)
Limit settings are user-programmable
Data is transferred over 2-wire/SMBus interface
Two address inputs allow up to four DS1780 to operate on a single bus
2.8V to 5.75V operating range
24-pin 173mil TSSOP package (DS1780E)

	Computer Graphics Systems
	Industrial Instruments
	Notebook Computers
	Portable Terminals
	Storage Area Networks (SANs)

Key Specifications: Temperature Sensors

Part Number

Sensor Type

Functions

Interface

Accuracy
(±°C)

Parasite Pwr.

Temp. Thresh.

Temp. Resolution
(bits)

Multi Droppable

Oper. Temp.
(°C)

Smallest Available Pckg.
(mm²)

Price

max w/pins

See Notes

DS1780

Local

Fan Controller

Voltage Monitor

2-Wire/I²C/SMBus

Programmable

Yes

-40 to +125

$2.21 @1k

See All Temperature Sensors (99)

Diagram

Functional Block Diagram

Application Notes

Application Note 3930: Package Thermal Resistance Values (Theta JA, Theta JC) for Dallas Semiconductor Temperature Sensors - DS1780

Design Guides

Thermal Management (PDF)

Reliability Reports

Reliability Report: DS1780.pdf

Software/Models

none

Ordering Information

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Devices: 1-3 of 3

DS1780 Free
Sample Buy Status

Package: TYPE PINS FOOTPRINT

DRAWING CODE/VAR *

Temp RoHS/Lead-Free?
Materials Analysis

DS1780E

Active TSSOP;24 pin;52 mm²
Outline Drawing: 21-0066 (PDF)
Land Pattern: 90-0118 (PDF)
Use pkgcode/variation: U24-2*
-20°C to +85°C RoHS/Lead-Free: No
Materials Analysis

DS1780E+

Active TSSOP;24 pin;52 mm²
Outline Drawing: 21-0066 (PDF)
Land Pattern: 90-0118 (PDF)
Use pkgcode/variation: U24+1*
-20°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis

DS1780E+T&R

Active TSSOP;24 pin;52 mm²
Outline Drawing: 21-0066 (PDF)
Land Pattern: 90-0118 (PDF)
Use pkgcode/variation: U24+1*
-20°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis

More Information

Temperature Family by Product Type

Related Products

More Like This: View Product Families for Similar Products

See All Temperature Sensors (99 Products)

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Description
Key Features
Applications/Uses
Key Specifications
Diagram

Data Sheet
Application Notes
Design Guides
Engineering Journals
Reliability Reports
Software/Models
Evaluation Kits

Price and Availability
Samples
Buy Online
Package Information
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Notes and Comments
Evaluation Kits

1999-11-19
This page last modified: 2009-10-23