L9805 datasheet(5/103 Pages) STMICROELECTRONICS

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L9805

1 GENERAL DESCRIPTION

1.1 INTRODUCTION

The L9805 is a Super Smart Power device suited

to drive resistive and inductive loads under soft-

ware control. It includes a ST7 microcontroller and

some pheripherals. The microcontroller can exe-

cute the software contained in the program

EPROM/ROM and drive, through dedicated regis-

ters, the power bridge.

The internal voltage regulators rated to the auto-

motive environment, PWM modules, CAN trans-

ceiver and controller, ISO 9141 transceiver, tim-

ers, temperature sensor and the AtoD converter

allow the device to realize by itself a complete ap-

plication, in line with the most common mechatron-

ic 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 cur-

rent.

It is recommended to keep the L9805 device out of

direct sunlight, since the UV content of sunlight

can be sufficient to cause functional failure. Ex-

tended 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 con-

ditions. Covering the window also reduces IDD in

power-saving modes due to photo-diode leakage

currents.

An Ultraviolet source of wave length 2537 Å yield-

ing a total integrated dosage of 15 Watt-sec/cm

2 is

required to erase the EPROM. The device will be

erased in 40 to 45minutes if such a UV lamp with a

12mW/cm

2 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 soft-

ware that are part of the development tool-set.

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