ADI LTC1955EUH#PBF

4-проводной последовательный интерфейс1,7 В ~ 5,5 ВПоверхностный монтаж

Overview

FEATURES ■Compatible with IS07816-3 and EMV Electrical Specifications Power Management and Control for Two Smart Cards Control/Status Serial Port May be Daisy-Chained for Multicard Applications Automatic Shutdown on Electrical Faults Buck/Boost Charge Pump Generates 5V,3V or 1.8V 0utputs(Smart Card Classes A,B and C)*Independent 5V/3V/1.8V Level Control for Both Cards ■Automatic Level Translation Supervisory Functions Prevent Smart Card Faults Low Operating Current:250uA Typical ■Ultralow Shutdown Current>10KV ESD on Smart Card Pins ■Small 32-Pin 5mm ×5mm QFN Package

The LTC@1955 provides all necessary supervisory and power control functions for two smart cards, two S.A.M. cards or a combination of S.A.M. and smart cards. It provides a charge pump for battery powered applications as well as all necessary level shifting circuitry. The card voltages can be independently set to 1.8V,3V or5V. Both card interfaces include a card detection channel with automatic debounce circuitry. To reduce wiring costs, the LTC1955EUH interfaces to a microcontroller via a simple 4-wire serial interface. Multiple devices may be connectedin daisy-chain fashion so that the number of wires to the card socket board is independent of the number of sock-ets. Status data is returned over the same interface. Extensive security features ensure proper deactivation sequencing in the event of a supply fault or a smart card electrical fault. The smart card pins can withstand greater than 10kV ESD in-situ with no additional components. The LTC1955EUH is available in a small 5mm × 5mm QFN package.

Features

Applications

• Precision data acquisition
• Battery-powered systems
• Sample-and-hold systems
• Communication systems
• Data Acquisition Systems
• Relay Replacement
• Battery Powered Systems
• Existing multiplexer applications (both fault-protected and
• nonfault-protected)
• New designs requiring multiplexer functions