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부품번호 EM6152 기능
기능 5V Automotive Regulator
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EM6152 데이터시트, 핀배열, 회로
R EM MICROELECTRONIC - MARIN SA
EM6152
5V Automotive Regulator with Windowed Watchdog
Description
The EM6152 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
EM6152 (version 55) and it goes into a stand-by mode in
order to save power (CAN-bus sleep detector).
wwwIn.DEatMaS6h1e5e2t4, Uth.ceomvoltage regulator has a low dropout voltage
and a low quiescent current of 135 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 135 μA
‰ -40°C to +125°C temperature range
‰ Highly accurate 5 V, 400 mA guaranteed output (actual
maximum current depends on power dissipation)
‰ Low dropout voltage, typically 250 mV at 250 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 3.0 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
‰ Green SO-8 and PSOP2-16 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
EM6152
ROSC
VSS
VIN
TCL
RES
EN
+
100nF 22uF R1
R2
5V
VDD
I/O
RES
I/O
GND
Selection Table
Part Number VREF
EM6152V30
EM6152V50
EM6152V53
EM6152V55
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
rev. B / 06.06
Fig. 1
1
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EM6152 pdf, 반도체, 판매, 대치품
R
EM6152
Electrical Characteristics
VINPUT = 13.5 V, CL = 22 μF + 100 nF, CINPUT = 22 μF, Tj = -40 to +125°C, unless otherwise specified
Parameter
Symbol Test Conditions
Min.
Supply current in standby mode and sleep
mode for V55
Supply current (note1)
Supply current (note 1)
ISS
ROSC = don’t care, TCL = VOUTPUT,
VIN = 0 V, IL = 1 mA
ISS
ROSC = 100 kΩ, I/PS at VOUTPUT,
O/PS 1 MΩ to VOUTPUT, IL = 1 mA
ISS
ROSC = 100 kΩ, I/PS at VOUTPUT,
O/PS 1 MΩ to VOUTPUT, IL = 250 mA
Output voltage
VOUTPUT 5 mA IL 250 mA
Line regulation (note 2)
VLINE 12 V VINPUT 32 V, IL = 5 mA
Load regulation (note 2)
VL 5 mA IL 250 mA, VINPUT=6V
Dropout voltage (note 3)
VDROPOUT IL = 250 mA
Output voltage temperature coefficient (note 4) Vth(coeff)
Current limit
ILmax OUTPUT tied to VSS, VINPUT=6V
RES & EN
Output Low Voltage
EN
Output High Voltage
TCL Input Low Level
TCL Input High Level
Leakage current
VOUTPUT = 4.5 V, IOL = 8 mA
VOL VOUTPUT = 2.0 V, IOL = 4 mA
VOUTPUT = 1.2 V, IOL = 0.5 mA
VOUTPUT = 4.5 V, IOH= -1 mA
VOH VOUTPUT = 2.0 V, IOH= -100 μA
VOUTPUT = 1.2 V, IOH= -20 μA
VIL
VIH
ILI VSS VTCL VOUTPUT
Version V30 (replaces A6130)
Comparator reference (note 5, 6)
VREF
Version V50 (replaces A6150 and A6250)
Version V53
4.8
400
3.5
1.8
0.9
VSS
2.5
1.135
1.475
1.475
Comparator hysteresis (note 6)
VIN input resistance
VHY
RVIN
Version V55 (replaces A6155)
1.235
Typ.
135
Max.
270
Unit
μA
145 280 μA
7 14 mA
5
10
35
250
0.5
600
0.25
0.2
0.04
4.1
1.9
1.05
0.05
1.170
1.520
1.520
1.275
2
100
5.2 V
25 mV
80 mV
500 mV
mV/°C
mA
0.45
0.4
0.2
0.5
VOUTPUT
1.205
V
V
V
V
V
V
V
V
μA
V
1.565 V
1.565 V
1.315 V
mV
MΩ
Table 3
www.DataSheet4U.com
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
if INPUT is connected to VSS, no reverse current will flow from the OUTPUT to the INPUT, however the supply current specified will be
sank by the OUTPUT to supply the EM6152.
regulation is measured at constant junction temperature using pulse testing with a low duty cycle. Changes in OUTPUT voltage due to
heating effects are covered in the specification for thermal regulation.
the dropout voltage is defined as the INPUT to OUTPUT differential, measured with the input voltage equal to 5.0 V.
output voltage temperature coefficient is defined as the change in OUTPUT voltage after a change in power dissipation is applied,
excluding load or line regulation effects.
the comparator and the voltage regulator have separate voltage references (see “Block Diagram” Fig. 3).
the comparator reference is the power-down reset threshold. The power-on reset threshold equals the comparator reference voltage
plus the comparator hysteresis (see Fig. 5).
Copyright © 2006, EM Microelectronic-Marin SA
rev. B / 06.06
4
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EM6152 전자부품, 판매, 대치품
R
EM6152
Functional Description
VIN Monitoring
The power-on reset and the power-down reset are
generated as a response to the external voltage level
applied on the VIN input. The threshold voltage at which
reset is asserted or released (VRESET) is determined by the
external voltage divider between VDD and VSS, as shown on
Fig. 8. A part of VDD is compared to the internal voltage
reference. To determine the values of the divider, the
leakage current at VIN must be taken into account as well as
the current consumption of the divider itself. Low resistor
values will need more current, but high resistor values will
make the reset threshold less accurate at high temperature,
due to a possible leakage current at the VIN input. The sum
of the two resistors (R1 + R2) should stay below 500 kΩ. The
formula is:
VRESET = VREF x (1 + R1/R2).
Example: choosing R1 = 200 kΩ and R2 = 100 kΩ gives
VRESET =4.56 V (typical) for version V50 and V53.
At power-up the reset output ( RES ) is held low (see Fig. 5).
When VIN becomes greater than VREF, the RES output is
held low for an additional power-on-reset (POR) delay TPOR
(defined with the external resistor connected at ROSC pin).
The TPOR delay prevents repeated toggling of RES even if
VDD voltage drops out and recovers. The TPOR delay allows
the microprocessor’s crystal oscillator time to start and
stabilize and ensures correct recognition of the reset signal
to the microprocessor.
The RES output goes active low generating the power-
down reset whenever VIN falls below VREF. The sensitivity or
reaction time of the internal comparator to the voltage level
on VIN is typically 3 μs.
Timer Programming
wwwT.DheataoSnh-ceheitp4Uo.sccoimllator allows the user to adjust the power-on
reset (POR) delay TPOR and the watchdog time TWD by
changing the resistor value of the external resistor ROSC
connected between the pin ROSC and VSS (see Fig. 8). The
closed and open window times (TCW and TOW) as well as the
watchdog reset pulse width (TWDR), which are TTCL
dependent, will vary accordingly. The watchdog time TWD
can be obtained with figures 9 to 12 or with the Excel
application EM6151ResCalc.xls available on EM website.
TPOR is equal to TWD with the minimum and maximum
tolerances increased by 1% (For Version 53, TPOR is one
fourth of TWD).
Note that the current consumption increases as the
frequency increases.
Voltage Regulator
The EM6152 has a 5 V, 400 mA, low dropout voltage
regulator. The low supply current makes the EM6152
particularly suitable for automotive systems which remain
continuously powered. The input voltage range is 2.3 V to
40 V for operation and the input protection includes both
reverse battery (42 V below ground) and load dump
(positive transients up to 45 V). There is no reverse current
flow from the OUTPUT to the INPUT when the INPUT
equals VSS. This feature is important for systems which
need to implement (with capacitance) a minimum power
supply hold-up time in the event of power failure. To achieve
Copyright © 2006, EM Microelectronic-Marin SA
rev. B / 06.06
good load regulation a 22 μF capacitor (or greater) is
needed on the INPUT (see Fig. 8). Tantalum or aluminium
electrolytic are adequate for the 22 μF capacitor; film types
will work but are relatively expensive. Many aluminium
electrolytic have electrolytes that freeze at about –30°C, so
tantalums are recommended for operation below –25°C.
The important parameters of the 22 μF capacitor are an
effective series resistance of lower than 3 Ω and a resonant
frequency above 500 kHz.
A 22 μF capacitor (or greater) and a 100 nF capacitor are
required on the OUTPUT to prevent oscillations due to
instability. The specification of the 22 μF capacitor is as per
the 22 μF capacitor on the INPUT (see previous paragraph).
The EM6152 will remain stable and in regulation with no
external load and the dropout voltage is typically constant as
the input voltage fall below its minimum level (see Table 2).
These features are especially important in CMOS RAM
keep-alive applications.
Power Dissipation
Care must be taken not to exceed the maximum junction
temperature (+125°C). The power dissipation within the
EM6152 is given by the formula:
PTOTAL = (VINPUT – VOUTPUT) × IOUTPUT + (VINPUT) × ISS
The maximum continuous power dissipation at a given
temperature can be calculated using the formula:
PMAX = ( 125°C – TA) / Rth(j-a)
where Rth(j-a) is the thermal resistance from the junction to
the ambient and is specified in Table 2. Note that Rth(j-a)
given in Table 2 assumes that the package is soldered to a
PCB (see figure 16). The above formula for maximum power
dissipation assumes a constant load (i.e. >100 s). The
transient thermal resistance for a single pulse is much lower
than the continuous value.
CAN-Bus Sleep Mode Detector (version 55)
When the microcontroller goes into a standby mode, it
implies that it does not send any pulses on the TCL input of
the EM6152. After three reset pulse periods (TCW + TOW +
TWDR) on the RES output, the circuit switches on an internal
resistor of 1 MΩ, and it will have a reset pulse of typically 3
ms every 1 second on the RES output. When a TCL edge
(rising or falling) appears on the TCL input or the power
supply goes down and up, the circuit switches to the ROSC.
Watchdog Timeout Period Description
The watchdog timeout period is divided into two periods, a
closed window period (TCW) and an open window period
(TOW), see Fig. 4. If no pulse is applied on the TCL input
during the open window period TOW, the RES output goes
low for a time TWDR. When a pulse is applied on the TCL
input, the cycle is restarted with a close window period.
For example if TWD = TPOR = 100ms, TCW = 80 ms, TOW =
40ms and TWDR = 2.5ms.
When VIN recovers after a drop below VREF, the pad RES is
set low for the time TPOR during which any TCL activation is
disabled.
7 www.emmicroelectronic.com

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