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PDF EM6152A Data sheet ( Hoja de datos )
| Número de pieza | EM6152A | |
| Descripción | 5V Automotive Regulator | |
| Fabricantes | EM Microelectronic | |
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R EM MICROELECTRONIC - MARIN SA
EM6152A
5V Automotive Regulator with Windowed Watchdog
Description
The EM6152A offers a high level of integration by combining
voltage regulation, voltage monitoring and software
monitoring using a windowed watchdog.
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.
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%.
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 TCL input of the
EM6152A (version 55) and it goes into a stand-by mode in
order to save power (CAN-bus sleep detector).
wwwIn.DEatMaS6h1e5e2t4AU, .tchoemvoltage 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.
Features
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)
Applications
Automotive systems
Industrial
Home security systems
Telecom / Networking
Computers
Set top boxes
Typical Operating Configuration
Unregulated
Voltage
22uF +
ROSC
INPUT OUTPUT
EM6152A
ROSC
VIN
TCL
RES
VSS EN
+
100nF 10uF R1
R2
5V
VDD
I/O
RES
I/O
GND
Fig. 1
Selection Table
Part Number
VREF
EM6152A30
EM6152A50
EM6152A53
EM6152A55
1.17 V
1.52 V
1.52 V
1.275 V
Closed
Window
67%
67%
33%
67%
Open
Window
33%
33%
67%
33%
CAN-bus sleep
detector
NO
NO
NO
YES
Please refer to Fig. 4 for more information about the
open/closed window of the watchdog.
Copyright © 2006, EM Microelectronic-Marin SA
06/06, rev. B, Prelim.
1
www.emmicroelectronic.com
1 page  
R
EM6152A
Timing Characteristics
VINPUT = 13.5 V, IL = 100 μA, CL = 10 μF + 100 nF, CINPUT = 22 μF, Tj = -40 to + 125 °C, unless otherwise specified
Parameter
Symbol Test Conditions
Min. Typ. Max. Units
Propagation delay TCL to Output Pins
VIN sensitivity
Watchdog Reset Pulse Period
Version V30
TDIDO
TSEN
TWDRP
VINhigh=1.1xVREF, VINlow=0.9xVREF
TCL inactive
250 500
0.5 3 15
TCW + TOW+ TWDR
ns
μs
ms
Power-on Reset delay
Closed Window Time
Open Window Time
Watchdog Time
Watchdog Reset Pulse Width if no TCL
Version V50
TPOR
TCW
TOW
TWD
TWDR
ROSC= 116.9 kΩ ±1%
91.6
74
37
92.5
2.25
100 108.3
80 85.76
40 42.88
100 107.2
2.5 2.75
ms
Power-on Reset delay
Closed Window Time
Open Window Time
Watchdog Time
Watchdog Reset Pulse Width if no TCL
Version V53
TPOR
TCW
TOW
TWD
TWDR
ROSC= 121.6 kΩ ±1%
91.6
74
37
92.5
2.25
100 108.3
80 85.76
40 42.88
100 107.2
2.5 2.75
ms
Power-on Reset delay
Closed Window Time
Open Window Time
Watchdog Time
Watchdog Reset Pulse Width if no TCL
Version V55
TPOR
TCW
TOW
TWD
TWDR
ROSC = 23.2 kΩ ±1%
4.57
9.24
18.48
18.48
0.56
5.0
10
20
20
0.625
5.44
10.77
21.54
21.54
0.69
ms
Power-on Reset delay
Closed Window Time
Open Window Time
Watchdog Time
Watchdog Reset Pulse Width if no TCL
Watchdog Reset Pulse Width in Sleep Mode
Watchdog Reset Pulse Period in Sleep Mode
TPOR
TCW
TOW
TWD
TWDR
TWDRS
TWDRPS
ROSC = 107.5 kΩ ±1%
ROSC off; RINT=1MΩ
TCL inactive
wwwF.oDratdaiSffheereent4tUv.acolumes of TWD and ROSC, see figures 9 to 12.
91.6
74
37
92.5
2.25
2.8
750
100
80
40
100
2.5
3.2
1100
108.3
85.76
42.88
107.2
2.75
3.6
1450
ms
Table 4
Timing Waveforms
Watchdog Timeout Period
Version V50:
TWD
For ROSC=121.6 kOhm
Version V53:
TWD
For ROSC=23.2 kOhm
TCW (closed window)
TOW (open)
Watchdog
timer reset
80 120
Time [ms]
( V30, V50 and V55 have similar ratios for TCW and TOW )
TCW (closed)
Watchdog
timer reset
10
TOW (open)
30
Time [ms]
Fig. 4
Copyright © 2006, EM Microelectronic-Marin SA
06/06, rev. B, Prelim.
5
www.emmicroelectronic.com
5 Page 
R
Typical maximum OUTPUT current versus INPUT voltage
200
180
160
140
120
100
80
60
40
20
0
5
TA=25°C
TA=85°C
10 15 20 25
INPUT Voltage [V]
EM6152A
Exposed Pad SO-16 Package
Botton slug soldered to PCB
30 35 40
Fig. 13
www.DataSheet4U.com
Copyright © 2006, EM Microelectronic-Marin SA
06/06, rev. B, Prelim.
11
www.emmicroelectronic.com
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