MC33288 Просмотр технического описания (PDF) - Motorola => Freescale

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MC33288

Solid State Relay for Automotive Flasher Applications

Motorola => Freescale 

Freescale Semiconductor, Inc.

MC33288

PINS FUNCTION DESCRIPTION

Pin No.

TAB

6,7,8

13,14,15

3

18

19

20

2

4, 9, 10, 11, 12, 17

5, 16

11

Name/Function

Vbat

Supply Voltage

OUT1

OUTPUT Channel 1

OUT 2

OUTPUT Channel 2

IN 1

INPUT Channel 1

IN 2

INPUT Channel 2

Status

Status for both

Channels

Wlp

Warning Lamp Output

Cur R

Load Current Sense

NC

Not Connected

DNC

Do Not Connect

GND

GROUND

Description

The backside TAB is connected to the power supply of the

MC33288DH. In addition to its supply function, this pin contributes to

the thermal behaviour of the device by conducting the heat from the

switching MOSFET to the printed circuit board.

Pins 6,7,8 are the source of the output1 25mOhm MOSFET1. Pins

13,14,15 are source of the output 2 25mOhm MOSFET2. They deliver

current to the connected loads and are respectively controlled via the

IN1 and IN2 pins. These outputs are current limited and thermally

protected.

These are the device input pins which directly control their associated

outputs. The levels are CMOS compatible. When the input is a logic

low, the associated output MOSFET is in the off state. When input is

high, the MOSFET is turned on and the load is activated.

When both inputs are low, the device is in standby mode and its

supply current is reduced. Each input pin has an internal active pull

down, so that it will not float if disconnected.

The Fault output is an open drain indication that goes active low when

a fault mode (Openload, Overtemp) is detected by the device on

either one channel or both simultaneously. Its internal structure is an

open drain architecture with an internal clamp at 6V. An external pull

up resistor connected to Vdd (5V) is needed. See Functional Truth

Table.

This pin is the source of a 3.2 Ohm MOSFET. This output is current

limited and thermally protected. It delivers current through the

connected load when both IN1 and IN2 inputs are logic high. It is usually

used as a warning lamp driver for Flasher application.

The Current Sense pin deliver a ratioed amount (1/1000) of the sum

of the currents that can be used to generate signal ground referenced

output voltages for use by the microcontroller.

These pins are not used.

These pins must not be connected.

This is the Ground pin of the device.

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