MLX90719S Просмотр технического описания (PDF) - Melexis Microelectronic Systems

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MLX90719S

General purpose timer

Melexis Microelectronic Systems  

MLX90719

General purpose timer

Buzzer driver

The MLX90719 includes a piezo buzzer driver.

The push-pull output stage of this driver operates at 15V. An internal resistor between the output pin and the

push-pull stage protects the chip against reverse piezo effect.

Parameter

Symbol Test Conditions

Min Typ Max Units

Output impedance

Rob

Maximum output frequency Fbuzm

100 300 600 ohm

8 kHz

Comparator

The MLX90719 includes a multi-purpose comparator.

Setting bit ECOMP of P3 (see section “I/O ports”) enables this comparator. Inputs IN1B and IN2B become re-

spectively the positive and negative inputs of the comparator and IN4B becomes its output via a tri-state buffer.

To reduce the number of external components in applications using the comparator, a resistive bridge and a

feed back resistor (both internal) can be connected on the positive input of the comparator by mask option

OCOMP.

Notes:

Some logic in the digital core ensures that ENIN12B and ENIN4B = 1 when ECOMP = 1.

When ECOMP = 0 the comparator output is fixed to “1”.

A programmable prescaler has been implemented to allow frequency measurement at the output of the com-

parator (line IN4B). The status of bits CM0 and CM1 of P3 define the prescale ratio as described in table 15:

electrical characteristics of the comparator.

Parameter

Common mode range

Offset

Symbol Test Conditions

Vcm

Vcoff

Min Typ Max Units

20

80 %Vdd

-30

30 mV

CM1

CM0 Divide ratio

0

0

Prescaler bypassed

0

1

/16

1

0

/32

1

1

/64

MLX90719 General purpose timer

Page 10

Rev 1.0 30/Jul/00

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