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Datasheet: MLX90721S (Melexis, Inc.)

Auto Shut Off Timer

 

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MLX90721
Auto Shut Off Timer
3901090721
Page 1 of 12
Data Sheet
Rev. 003
Oct/02
Features and Benefits
!"
Low cost minimal external components
!"
Small package (to92 for the 3 pins version,
pdip8, psop8 or cob for the 4pins version)
!"
On chip calibrated timer
!"
Drives different relay types, including low
cost 12V relays and most custom made
relays.
!"
Low power consumption (low dissipation)
Applications
!"
Household appliances
!"
Heater
!"
Hand-dryer
Ordering Information
Part No.
Temperature Suffix
Package Code
Option Code*
MLX90721
C (0C to 70C)
SA (TO-92)
CA / CB / CC / CD / CE / CF
MLX90721
C (0C to 70C)
AA (PDIP8)
MLX90721
C (0C to 70C)
DC (SOIC8)
*See Option Code Table for details
1. Functional Diagram
POR
Vreg
options
OSC
logic
VDDA
VSS
BUT
OUT

2. Description
The chip is intended to be used for switching on
and off a mains powered device, with the added
feature of automatic switch off after a well-defined
amount of time. Such device can replace
conventional switches in all appliances that might
be left on inadvertently. Besides saving energy, the
main goal is to prevent all hazards due to
appliances left on unattended.
The chip can be used in its 3-pin version, where
applying the supply to the chip does switching on.
In the 4-pin version switching on and off is done
with a single push-button.
As an alternative the fourth pin can also be used as
a reset pin, where the auto-shut-off time counter is
reset when pushing this button.
The auto-shut-off time is mask programmable and
can be almost anything between 2.5 minutes and
32 hours. The duty cycle of the relay driver can
also be adjusted by mask to adapt to almost any
kind of relay construction.
MLX90721
Auto Shut Off Timer
3901090721 Page
2 of 12 Data Sheet
Rev. 003
Oct/02
TABLE OF CONTENTS
FEATURES AND BENEFITS........................................................................................................................1
APPLICATIONS ............................................................................................................................................1
ORDERING INFORMATION .........................................................................................................................1
1.
FUNCTIONAL DIAGRAM ...................................................................................................................
...1
2.
DESCRIPTION ....................................................................................................................................
...1
3.
ABSOLUTE MAXIMUM RATINGS........................................................................................................3
4.
MLX90721 ELECTRICAL SPECIFICATIONS.......................................................................................3
5.
MLX90721 SPECIFIC SPECIFICATIONS .............................................................................................3
6.
GENERAL DESCRIPTION ....................................................................................................................5
7.
PIN DESCRIPTION ................................................................................................................................6
8.
APPLICATION INFORMATION.............................................................................................................6
8.1.
B
UTTON
I
NPUT
. .............................................................................................................................................. 6
8.2.
D
UTY
C
YCLE AND
A
UTO
S
HUT
-OFF O
PTIONS
............................................................................................... 7
8.3.
O
PTION
C
ODE
T
ABLE
..................................................................................................................................... 7
9.
RELIABILITY INFORMATION...............................................................................................................8
10.
ESD PRECAUTIONS .............................................................................................................................8
11.
PACKAGE INFORMATION ...................................................................................................................9
12.
DISCLAIMER .......................................................................................................................................12
MLX90721
Auto Shut Off Timer
3901090721
Page 3 of 12
Data Sheet
Rev. 003
Oct/02
3. Absolute Maximum Ratings
Supply Voltage, V
DDA
(overvoltage)
70V
Supply Voltage, V
DDA
(operating)
68V
ESD Sensitivity (AEC Q100 002)
2kV

Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute
maximum-rated conditions for extended periods may affect device reliability.

4. MLX90721 Electrical Specifications
DC Operating Parameters T
A
= 0
o
C to 85
o
C
Parameter Symbol
Test
Conditions
Min
Typ
Max
Units
Ambient temperature
Tamb
0
85
C
Max. junction temperature
Tjm
125
C

5. MLX90721 Specific Specifications
Supply Current
Parameter Symbol
Test
Conditions
Min
Typ
Max
Units
Supply current at VDDA=48V
Idd1
VDDA=48V, OUT open BUT not
active
170 270 370 A
Supply current at VDDA=55V
Idd2
VDDA=55V, OUT open BUT not
active
200 300 400 A
Integrated Zener
Parameter Symbol
Test
Conditions
Min
Typ
Max
Units
Zener voltage at VDDA
Vzen
58
62
68
V
Maximum sink current
Izm
10
mA
Power On Reset
Parameter Symbol
Test
Conditions
Min
Typ
Max
Units
DPOR high level
Vdh
2.8
V
DPOR
hysteresis
Vdhys
0.9
V
APOR high level
VAPH
32
42
V
APOR hysteresis
VHYS
7
12
V
MLX90721
Auto Shut Off Timer
3901090721
Page 4 of 12
Data Sheet
Rev. 003
Oct/02
Relay Driver Output
Parameter Symbol
Test
Conditions
Min
Typ
Max
Units
Maximum current in ON state
Ion
50
mA
Output voltage in ON state
Von
Iout = 50mA
0.4
3
V
Leakage current in OFF state
Ioff
V(OUT)=Vzen
1
50
mA
Over voltage protection
Vprot
90
V
Iout = 25mA Fast option
0.27
0.3
0.32
s
Rise / fall times
Trf
Iout = 25mA Slow option
0.7
1.0
1.3
s
Frequency of the relay driver
F1
21.8
kHz
Duty cycle of the relay driver
DC1
See options
Var.
%
Internal Oscillator
Parameter Symbol
Test
Conditions
Min
Typ
Max
Units
Nominal frequency
Fosc
VDDA = 60V, Tamb
437
kHz
Frequency tolerance
Df
20V < VDDA < 68V
-6
6
%
Temp. coefficient of oscillator
frequency
TCf T=0-100C
1000
ppm
Button Input
Parameter Symbol
Test
Conditions
Min
Typ
Max
Units
Threshold voltage
Vtr
Valid for APPL.1 and APL.2
2.5
V
Threshold current
Itr
Valid for APPL.3
+12
mA
Max. source current
Im1
-350
mA
Max. sink current
Im2
350
mA
Clamp voltage 1
Vc1
APPL.3; Ibut = +4mA
5
V
Clamp voltage 2
Vc2
APPL.3; Ibut = -4mA
0
V
Timings
Parameter Symbol
Test
Conditions
Min
Typ
Max
Units
Switch ON delay time
Td
47
mS
Auto Shut-OFF time
Ta
See options
Increased Duty Cycle period
Tdub
In case this option is enabled
6
mS




MLX90721
Auto Shut Off Timer
3901090721
Page 5 of 12
Data Sheet
Rev. 003
Oct/02
6. General Description
The chip is intended to be used for switching on
and off a mains powered device, with the added
feature of automatic switch off after a fixed
amount of time. Such device can replace
conventional switches in all appliances that might
be left on inadvertently.
Besides saving energy, the main goal is to
prevent all hazards due to appliances left on
unattended.
The chip is offered in a 3-pin version, where
applying the supply is switching the chip on. In its
4-pin version, switching on and off is done with a
single push-button.
As an alternative the fourth pin can also be used
as a reset pin, where the auto-shut-off time
counter is reset when pushing this button.
The chip application version (3 or 4 pins) and
auto-shut-off time are mask programmable. The
auto-shut-off time can be almost any value
between 2.5 minutes and 32 hours. The duty
cycle of the relay driver can also be adjusted by
the same mask to adapt to all types of relay
construction.
Power-On-Reset.
The Power-On-Reset of the ASIC is a
combination of a digital power-on-reset with
hysteresis DPOR, and an analog APOR.
DPOR is used to initialize the logic on the chip.
The APOR is characterized by a low level APL
signal and a high level APH signal, which are
debounced as follows:
low level debouncing approx. 25mS
high level debouncing approx. 3.5mS
The digital signal APOR is a logic combination of
the debounced signals APLd and APHd. APOR is
set to High when APHd = high and APOR is reset
to Low when APLd = low.
A transition to the active state is indicated by the
digital signal APOR=1 in case of application 1
and 2, or APOR=1 and START=1 in case of
application 3. The result is that the transistor at
the pin OUT is activated after a delay time Td,
and starts switching ON and OFF with the
specified frequency F1 and duty cycle DC1.
The digital signal APOR=0 immediately brings
the logic back to the INACTIVE state, i.e. the
output is disabled and the state of the digital
output signal from the start-stop/reset button (if
present in the particular application) is initialized
to non-pressed (released) state.
Auto Shut-OFF Function
When the ASIC is in the ACTIVE state and when
the delay period Td has elapsed, the output is
activated (with a well defined duty cycle) for a
predefined Auto Shut-OFF Time Ta. At the end of
that period Ta, the output is switched OFF, the
ASIC is brought to the INACTIVE state and the
state of the digital output signal from the start-
stop/reset button (if present) is initialized.
Doubled Duty cycle
Mechanical relays normally need a higher
magnetic field (and thus a higher coil current) to
move the contact away from his normal position,
then to keep the contact in that position.
Therefore it is possible to increase the current
supplied to the coil during the first 6 msec after
activation of the output driver. This is done by
doubling the duty cycle, which has been selected
by mask option.
With a proper dimensioning of the external
components the power consumption of the
module can be optimized in this way.
Test Mode
The test mode aims full verification of the above
specified logic functions and electrical
characteristics, both on wafer and packaged
device.
The test mode is defined under the following
conditions:

V(OUT) = 0V for approx. 5msec
. The ASIC
enters test mode when on pin OUT is detected
short-circuit to GND. This detection is done after
a digital debouncing for a period of ~ 5mS and
the result is latched and saved in a test status
flip-flop.
When in test mode, pin OUT is used as input for
the test clock sequence, as well as an output for
the IC reaction. This is achieved by appropriate
definition of input/output signal levels.
V(OUT) < 9V. This restriction aims to make a
clear distinction between normal mode operation,
when V(OUT)=VDDA, and test mode. This
feature also ensures that if by mistake test mode
is activated during Normal Mode operation, and
at the same time on pin OUT is found a potential
higher than 9V, follows immediate reset of test
mode, and the IC is brought back to normal
mode.

MLX90721
Auto Shut Off Timer
3901090721
Page 6 of 12
Data Sheet
Rev. 003
Oct/02
7. Pin Description
Pin Name
Type
Description
1 VDDA
Supply
2 GND
Ground
3
OUT
Output
Relay driver output
4 (optional)
BUT
Input
Button input

8. Application Information
8.1. Button Input.
The Button input can have three different
functions, which determine the three different
applications: APPL.1, APPL.2 and APPL.3. The
function of the input is defined by the option
mask.

APPL.1-No Function. The BUT input is not used
and therefore not connected externally. BUT is an
internally pulled up digital input. In this case, the
transitions INACTIVE > ACTIVE state and vice
versa are defined only by the APOR signal.
MLX90721
LED (optional)
N
L
Load
VDD
GND
OUT
Appl.1 Auto Shut Off without button
BUT

APPL.2-Auto Shut-OFF Time Reset. The input
BUT can be connected to GND via an external
button. The input is an internally pulled up, active
Low, inverting digital input. In this case, the
transitions INACTIVE state > ACTIVE state and
vice versa are again defined only by the APOR
signal. Each time the button is pressed a Reset
signal is generated and the countdown for the
Auto Shut-Off Time starts from 0 again.
The state of this input (pressed or not) is checked
each 3.5mS. The high level (button pressed) at
the digital output is debounced for approx.
3.5mS.
MLX90721
LED (optional)
N
L
Load
VDD
GND
OUT
Appl.2 Auto Shut Off with time reset button
BUT

APPL.3-Start/Stop Toggle Function. The input
BUT is now an active High, zero cross input with
internal pull down. The input is connected via a
button and external resistor to the mains.
MLX90721
LED (optional)
N
L
Load
VDD
GND
OUT
Appl.3 Auto Shut Off with start/stop button
BUT
Each time when this button is pressed, the
internal START signal toggles and in combination
with the APOR signal it defines the logic
transitions in the following way:
-
APOR=1 and START=1 > transition to
ACTIVE state
-
APOR=1 and START=0 > transition to
MLX90721
Auto Shut Off Timer
3901090721
Page 7 of 12
Data Sheet
Rev. 003
Oct/02
INACTIVE state
-
APOR=0 defines the INACTIVE state and
initialization of a start signal START= 0
The digital output of the BUT input is debounced
as follows:
-
High level debouncing (button pressed)
approx. 3.5mS
-
Low level debouncing (button released)
approx. 100mS
The first time the button is pressed after
initialization sets START=1. Once the logic has
found that the button is pressed, it has to detect a
released button in order to interpret correctly
consecutive activation of the button. Each next
pressing toggles the START signal.



8.2. Duty Cycle and Auto Shut-OFF Options
The function of input BUT as well as the doubled duty cycle function can be defined by mask option.
The following options can be defined by mask option:
Parameter Symbol
Conditions
Min
Typ
Max
Units
Relay Frequency Duty Cycle
DC
In steps of 2.5%
5
37.5
%
Interval
AUTO SHUT-OFF TIMES
0 1 H
2.5
5
7.5
10
12.5
15
17.5
20
22.5
25 30 35 37.5
40 45 50
52.5
min
1 2 H
1h
1h10m
1h15m
1h20m
1h30m
1h40m
1h45m
2 3 H
2h
2h20m
2h30m
2h40m
3 4 H
3h
3h20m
3h30m
4 5 H
4h
4h40m
5 6 H
5h
5h20m
6 7 H
6h
6h40m
7 9 H
7h
8h
9 10 H
9h
9h20m
10 11 H
10h
10h40
12
32
H
12h 14h 16h 20h 24h 28h 32h
8.3. Option Code Table
The table below lists all option values for the available option codes.
OPTION
CA CB CC CD CE CF
BUT
input
APPL.1 APPL.1 APPL.1 APPL.1 APPL.1 APPL.1
Auto Shut Off time
2 h
1 h
30 min
10 h
15 min
1 h
Duty
Cycle
10% 10
% 10% 20% 10% 10%
Double Duty
No No No No No No
Output
Rise/Fall
times
Fast Slow Fast Fast Fast Fast



MLX90721
Auto Shut Off Timer
3901090721
Page 8 of 12
Data Sheet
Rev. 003
Oct/02
9. Reliability Information
Melexis devices are classified and qualified regarding suitability for infrared, vapor phase and wave
soldering with usual (63/37 SnPb-) solder (melting point at 183degC).
The following test methods are applied:

IPC/JEDEC J-STD-020A (issue April 1999)
Moisture/Reflow Sensitivity Classification For Nonhermetic Solid State Surface Mount Devices
CECC00802 (issue 1994)
Standard Method For The Specification of Surface Mounting Components (SMDs) of Assessed Quality
MIL 883 Method 2003 / JEDEC-STD-22 Test Method B102
Solderability

For all soldering technologies deviating from above mentioned standard conditions (regarding peak
temperature, temperature gradient, temperature profile etc) additional classification and qualification tests
have to be agreed upon with Melexis.

The application of Wave Soldering for SMD's is allowed only after consulting Melexis regarding assurance
of adhesive strength between device and board

For more information on manufacturability/solderability see quality page at our website:
http://www.melexis.com/

10. ESD Precautions
Electronic semiconductor products are sensitive to Electro Static Discharge (ESD).
Always observe Electro Static Discharge control procedures whenever handling semiconductor products.



























MLX90721
Auto Shut Off Timer
3901090721
Page 9 of 12
Data Sheet
Rev. 003
Oct/02
11. Package Information
AA (PDIP8) Package Dimensions
9.02
10.16
Min
Max
18.67
19.68
18.67
19.68
22.35
23.67
24.89
26.92
31.24
32.51
0.20
0.38
2.54
BSC
1.1
5
1.7
7
0.35
0.55
0.39
Min
Dimension
8 Leads
16 Leads
18 Leads
20 Leads
14 Leads
24 Leads
A
6.10
7.11
5.33
MAX
2.93
4.06
7.62
BSC
10.92
Max
A
Notes:
1-All measurements in mm
2-Body dimensions do not include mold
flash or
protrusion - not to exceed
0.15mm





















MLX90721
Auto Shut Off Timer
3901090721
Page 10 of 12
Data Sheet
Rev. 003
Oct/02
DC (SOIC8) Package Dimensions
0.40
1.27
0
o
to 8
o
2.35
2.65
0.010 min.
0.33
0.51
A
Dimension
8 Leads
14 Leads
A
4.80
5.00
Min
Max
8.55
8.75
16 Leads
9.80
10.00
3.80
4.00
5.80
6.20
1.27
Notes:
1-All nominal measurements in millimeters
2-Body dimensions do not include mold flash or
protrusion - not to exceed 0.15mm






















MLX90721
Auto Shut Off Timer
3901090721
Page 11 of 12
Data Sheet
Rev. 003
Oct/02
SA (TO-92) Package Dimensions
Note: All dimensions in inches.


























MLX90721
Auto Shut Off Timer
3901090721
Page 12 of 12
Data Sheet
Rev. 003
Oct/02
12. Disclaimer

Devices sold by Melexis are covered by the warranty and patent indemnification provisions appearing in
its Term of Sale. Melexis makes no warranty, express, statutory, implied, or by description regarding the
information set forth herein or regarding the freedom of the described devices from patent infringement.
Melexis reserves the right to change specifications and prices at any time and without notice. Therefore,
prior to designing this product into a system, it is necessary to check with Melexis for current information.
This product is intended for use in normal commercial applications. Applications requiring extended
temperature range, unusual environmental requirements, or high reliability applications, such as military,
medical life-support or life-sustaining equipment are specifically not recommended without additional
processing by Melexis for each application.
The information furnished by Melexis is believed to be correct and accurate. However, Melexis shall not
be liable to recipient or any third party for any damages, including but not limited to personal injury,
property damage, loss of profits, loss of use, interrupt of business or indirect, special incidental or
consequential damages, of any kind, in connection with or arising out of the furnishing, performance or
use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow
out of Melexis' rendering of technical or other services.
2002 Melexis NV. All rights reserved.


For the latest version of this document,
go to our website at:
www.melexis.com
Or for additional information contact Melexis Direct:
Europe and Japan:
All other locations:
Phone: +32 13 67 04 95
Phone: +1 603 223 2362
E-mail: sales_europe@melexis.com
E-mail: sales_usa@melexis.com




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