MLX90719S 查看數據表（PDF） - Melexis Microelectronic Systems

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MLX90719S

General purpose timer

Melexis Microelectronic Systems  

MLX90719

General purpose timer

General description

The MLX90719 is an ASIC which is ideally suited

for timing control application, low cost as well as

high end, such as clocks in coffee machines, cook-

ers, baking equipment,...

The ASIC consists of a dedicated microcontroller

combined with on-chip analog and digital blocks,

which can be configured to a great extend. This

makes it ideal to adapt it to different applications by

means of an update in the software. The number of

external components for the electronic module is

minimized. A typical application mainly consists of

the MLX90719 ASIC, a number of command but-

tons, a LCD, a relay, some LED’s and a buzzer.

The number of buttons and their function can be

freely chosen. The configuration of the LCD, the

number of backplanes and its pinout is also under

software control. Three outputs are available for a

relay and LED’s.

Main functions:

General-purpose timer chip based on the 8-bit

LX11 core, including 80 bytes RAM and 6 Kbytes

ROM.

Programming of the ROM and selection of all other

options is done with one mask.

An interrupt controller guarantees exact timings

and a clean refresh rate of the LCD.

High supply voltage eliminates the need for high

power resistors.

6 digital inputs and 2 I/O pins (function is under

software control).

1 comparator (uses 2 of the digital inputs) which

can be used for analog measurements.

3 high current output drivers. They are suitable for

driving low cost 12V relays, but other types can

also be used. They can also be used to drive triac

or LED’s without the need for external resistors.

1 buzzer output for piezo electric buzzers, with pro-

grammable frequency.

The LCD interface consists of 15 outputs, each of

them can be configured as backplane or segment

driver.

The time base for the clock function is derived ei-

ther from the mains frequency or from a crystal os-

cillator.

The clock frequency for the microcontroller, relay

drivers and buzzer output is derived from an on

chip oscillator, which is calibrated under software

control.

For applications that are disconnected from the

mains for longer times, a battery backup can be

foreseen, so that the module always keeps track of

the time.

For short mains interruptions (up to 5 minutes), the

energy in a decoupling capacitor can be used to

keep track of the time.

An on-chip watchdog ensures the functioning of the

chip under all environmental conditions.

The package size can be adapted to the number of

used pins (non-used I/O’s do not need to be

bonded).

MLX90719 General purpose timer

Page 2

Rev 1.0 30/Jul/00

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