MLX90721SL-X View Datasheet(PDF) - Melexis Microelectronic Systems

Part Name

Description

Manufacturer

MLX90721SL-X

Auto Shut Off Timer

Melexis Microelectronic Systems  

MLX90721

Auto Shut Off Timer

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. Each time 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 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 activations

of the button. Each next pressing toggles the START

signal.

L

Load

N

LED (optional)

VDD

90721

OUT

BUT GND

Internal Oscillator.

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the contact away from his normal position, then to

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possible to increase the current supplied to the coil

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Ooppttimionizaeldly,in tthheisrewacyo.uld be doubled duty cycle

during the first few msec -Tdub. This option is

useful to provide the extra energy needed for the

mechanical movement when activating a relay.

Test Mode

Supply.

The test mode aims full verification of the above

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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 an 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.

Appl.1 ASO with start/stop button

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.

Disclaimer

Melexis reserves the right to periodically make

modifications to product specifications. The infor-

mation included herein is believed to be accurate

and reliable. However, Melexis assumes no re-

sponsibility for its use; nor for any infringements of

patents or other rights of third parties which may

MMLLXX990027xx21NaAmuetooSf hSuetnOsofrf Timer

RePvaYg.Xe 3

22/Aug/98 Rev 1.0 2P2/aJguen3/00

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