L9805E datasheet(9/127 Pages) STMICROELECTRONICS

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L9805E

General description

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General description

1.1

Introduction

The L9805E is a Super Smart Power device suited to drive resistive and inductive loads

under software control. It includes a ST7 microcontroller and some pheripherals. The

microcontroller can execute the software contained in the program EPROM/ROM and drive,

through dedicated registers, the power bridge.

The internal voltage regulators rated to the automotive environment, PWM modules, CAN

transceiver and controller, timers, temperature sensor and the AtoD converter allow the

device to realize by itself a complete application, in line with the most common mechatronic

requirements.

1.2

OTP, ROM and EPROM devices

For development purposes the device is available in plastic HiQuad package without window

rating in the OTP class.

Mass production is supported by means of ROM devices.

Engineering samples could be assembled using window packages. These are generally

referenced as “EPROM devices”.

EPROM devices are erased by exposure to high intensity UV light admitted through the

transparent window. This exposure discharges the floating gate to its initial state through

induced photo current.

It is recommended to keep the L9805E device out of direct sunlight, since the UV content of

sunlight can be sufficient to cause functional failure. Extended exposure to room level

fluorescent lighting may also cause erasure.

An opaque coating (paint, tape, label, etc...) should be placed over the package window if

the product is to be operated under these lighting conditions. Covering the window also

reduces IDD in power-saving modes due to photo-diode leakage currents.

An Ultraviolet source of wave length 2537 Å yielding a total integrated dosage of 15 Watt-

sec/cm2 is required to erase the EPROM. The device will be erased in 40 to 45minutes if

such a UV lamp with a 12mW/cm2 power rating is placed 1 inch from the device window

without any interposed filters.

OTP and EPROM devices can be programmed by a dedicated Eprom Programming Board

and software that are part of the development tool-set.

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