L9805E Datasheet, PDF (9/127 Pages) STMicroelectronics – Super smart power motor driver with 8-Bit MCU, RAM, EEPROM, ADC, WDG, Timers, PWM and H-bridge driver

L9805E
1
General description
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 I_DD 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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