R
EM MICROELECTRONIC - MARIN SA
EM6153
5V Automotive Regulator with Inhibit Input and
Windowed Watchdog
Description
Features
The EM6153 offers a high level of integration by combining
voltage regulation, voltage monitoring and software
monitoring using a windowed watchdog.
Low quiescent current 90 μA
Very low OFF current consumption < 1uA
-40°C to +125°C temperature range
A comparator monitors the voltage applied at the VIN input
comparing it with an internal voltage reference VREF. The
power-on reset function is initialized after VIN reaches VREF
and takes the reset output inactive after a delay TPOR
depending on external resistance ROSC. The reset output goes
active low when the VIN voltage is less than VREF. The RES
and EN outputs are guaranteed to be in a correct state for a
regulated output voltage as low as 1.2 V. The watchdog
function monitors software cycle time and execution.
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
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 TCL pulse be received by the
watchdog during this “closed” time window. The ratio of the
open/closed window is either 33%/67% or 67%/33%.
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
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.
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
When the microcontroller goes in stand-by mode or stops
working, no signal is received on the TCL input and the
EM6153 (version 55) goes into a stand-by mode in order to
save power (CAN-bus sleep detector).
Green SO-16 Exposed pad package (RoHS compliant)
Applications
In EM6153, the voltage regulator has a low dropout voltage
and a low quiescent current of 75 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.
Automotive systems
Industrial
Home security systems
Telecom / Networking
Computers
Set top boxes
Typical Operating Configuration
Selection Table
Unregulated
Voltage
Closed
Window
67%
Open
Window
33%
CAN-bus sleep
detector
Part Number
VREF
5V
INPUT OUTPUT
VDD
VDD
+
R1
100nF 10uF
EM6153V50
EM6153V53
1.52 V
1.52 V
NO
NO
EM6153
Inhibit
33%
67%
INH
VIN
TCL
RES
EN
I/O
22uF
EM6153V55 1.275 V
67%
33%
YES
+
ROSC
RES
I/O
Please refer to Fig. 4 for more information about the
open/closed window of the watchdog.
VSS
ROSC
R2
GND
Fig. 1
Copyright © 2006, EM Microelectronic-Marin SA
06/06, rev. B, prelim.
1
www.emmicroelectronic.com
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