SCANSTA476 Datasheet, PDF(1/7 Page) National Semiconductor (TI) – Eight Input IEEE 1149.1 Analog Voltage Monitor

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SCANSTA476 Datasheet, PDF (1/7 Pages) National Semiconductor (TI) – Eight Input IEEE 1149.1 Analog Voltage Monitor

April 2005

SCANSTA476

Eight Input IEEE 1149.1 Analog Voltage Monitor

General Description

The SCANSTA476 is a low power, Analog Voltage Monitor

used for sampling or monitoring up to 8 analog/mixed-signal

input channels. Analog Voltage Monitors are valuable during

product development, environmental test, production, and

field service for verifying and monitoring power supply and

reference voltages. In a supervisory role, the âSTA476 is

useful for card or system-level health monitoring and prog-

nostics applications.

Instead of requiring an external microcontroller with a GPIO

interface, the âSTA476 features a common IEEE 1149.1

(JTAG) interface to select the analog input, initiate a mea-

surement, and access the results - further extending the

capabilities of an existing JTAG infrastructure.

The SCANSTA476 uses the VREF input as a reference. This

enables the SCANSTA476 to operate with a full-scale input

range of 0 to VDD, which can range from +2.7V to +5.5V.

The SCANSTA476 is packaged in a 16-lead non-pullback

LLP package that provides an extremely small footprint for

applications where space is a critical consideration. This

product operates over the industrial temperature range of

â40ËC to +85ËC.

Features

n Eight selectable Analog input channels

n Analog full-scale input range 0V to VDD

n Typical accuracy of 2 mV at maximum VDD

n Very low power operation

n Small package footprint in 16-lead, 5 x 5 x 0.8 mm LLP

n Single +2.7V to +5.5V supply operation

n IEEE 1149.1 (JTAG) compliant interface

Applications

n Measurement of Point Voltages

n Real-time Signal Monitoring

n System Health Monitoring and Prognostics

n Debug, Environmental Test, Production Test, Field

Service

n Supplement In-Circuit Tester (ICT) access

n Vital in Servers, Computing, Telecommunication and

Industrial equipment

n Essential in Medical, Data Storage, and Networking

equipment

Block Diagram

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