EM6152A EM Microelectronic, EM6152A Datasheet

EM6152A

Manufacturer Part Number

EM6152A

Description

5V Automotive Regulator

Manufacturer

EM Microelectronic

Datasheet

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Description

The EM6152A offers a high level of integration by combining

voltage

monitoring using a windowed watchdog.

A comparator monitors the voltage applied at the V

comparing it with an internal voltage reference V

power-on reset function is initialized after V

and takes the reset output inactive after a delay T

depending on external resistance R

active low when the V

and

regulated output voltage as low as 1.2 V. The watchdog

function monitors software cycle time and execution.

If software clears the watchdog too quickly (incorrect cycle

time) or too slowly (incorrect execution) it will cause the

system to be reset. For enhanced security, the watchdog

must be serviced within an “open” time window. During the

remaining time, the watchdog time window is “closed” and a

reset will occur should a

watchdog during this “closed” time window. The ratio of the

open/closed window is either 33%/67% or 67%/33%.

The system ENABLE output prevents critical control functions

being activated until software has successfully cleared the

watchdog three times. Such a security could be used to

prevent motor controls being energized on repeated resets of

a faulty system.

When the microcontroller goes in stand-by mode or stops

working, no signal is received on the

EM6152A (version 55) and it goes into a stand-by mode in

order to save power (CAN-bus sleep detector).

In EM6152A, the voltage regulator has a low dropout voltage

and a low quiescent current of 90 μA. The quiescent current

increases only slightly in dropout prolonging battery life. Built-

in protection includes a positive transient absorber for up to

45 V (load dump) and the ability to survive an unregulated

input voltage of -42 V (reverse battery). The input may be

connected to ground or to a reverse voltage without reverse

current flowing from the output to the input.

Typical Operating Configuration

06/06, rev. B, Prelim.

Unregulated

22uF

Voltage

OSC

5V Automotive Regulator with Windowed Watchdog

outputs are guaranteed to be in a correct state for a

regulation,

INPUT

EM6152A

OSC

EM MICROELECTRONIC -

OUTPUT

RES

voltage

TCL

voltage is less than V

TCL

100nF

monitoring

10uF

pulse be received by the

OSC

. The reset output goes

GND

TCL

and

I/O

RES

I/O

REF

reaches V

input of the

. The

Fig. 1

REF

software

. The

input

RES

POR

REF

Features

Applications

Selection Table

Please refer to Fig. 4 for more information about the

open/closed window of the watchdog.

Part Number

EM6152A 30

EM6152A 50

EM6152A 53

EM6152A 55

MARIN SA

Low quiescent current 90 μA

-40°C to +125°C temperature range

Highly accurate 5 V, 150 mA guaranteed output (actual

maximum current depends on power dissipation)

Low dropout voltage, typically 250 mV at 100 mA

Unregulated DC input can withstand -42 V reverse battery

and +45 V power transients

Fully operational for unregulated DC input voltage up to

40 V and regulated output voltage down to 3.5 V

No reverse output current

Very low temperature coefficient for the regulated output

Current limiting

Windowed watchdog with an adjustable time windows,

guaranteeing a minimum time and a maximum time

between software clearing of the watchdog

Time base accuracy ±8% (at 100ms)

Sleep mode function (V55)

Adjustable threshold voltage using external resistors

Adjustable power on reset (POR) delay using one

external resistor

Open-drain active-low RESET output

Reset output guaranteed for regulated output voltage

down to 1.2 V

System ENABLE output offers added security

Qualified according to AEC-Q100

Pin out compatible with EM6152

Green SO-8 and Exposed Pad SO-16 packages (RoHS

compliant)

Automotive systems

Industrial

Home security systems

Telecom / Networking

Computers

Set top boxes

1.275 V

1.17 V

1.52 V

REF

Window

Closed

67%

33%

67%

Window

www.emmicroelectronic.com

EM6152A

Open

33%

67%

33%

CAN-bus sleep

detector

YES

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