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

Zero crossing detector

The MLX90719 includes a zero crossing detector on pin ZCD. This detector contains two comparators with hys-

teresis. The first comparator has negative thresholds and the second one has positive thresholds (see table 5).

Outputs ZOUT1 and ZOUT2 of those comparators are changing as follows:

ZOUT1 rises when Vmains>Vz1h

ZOUT1 falls when Vmains<Vz1l

ZOUT2 rises when Vmains>Vz2h

ZOUT2 falls when Vmains<Vz2l

A mask option defines the levels of those thresholds. Low levels (+/- 5V, option OZCD = 0) are suitable for zero

crossing detection and high levels (+/- 20V, option OZCD = 1) for frequency detection with a better noise immu-

nity.

A 1MΩ resistor must be connected between pin ZCD and the mains.

Parameter

Symbol Test Conditions

Min Typ Max Units

High level threshold 1

Low level threshold 1

High level threshold 2

Low level threshold 2

External resistor

Vz1h Rzcd = 1Mohm

Rzcd = 1Mohm, OZCD = 1

Vz1l

Rzcd = 1Mohm

Rzcd = 1Mohm, OZCD = 1

Vz2h Rzcd = 1Mohm

Rzcd = 1Mohm, OZCD = 1

Vz2l

Rzcd = 1Mohm

Rzcd = 1Mohm, OZCD = 1

Rzcd Vline = 230VAC typical

-5

V

-5

V

-9

V

-29

V

9

V

29

V

5

V

5

V

0.8 1 1.2 Mohm

Low voltage inputs

The MLX90719 has 7 CMOS Schmitt trigger inputs with internal pull-up.

Note: the input signals are inverted in the digital core so these inputs are active low.

Signal ENINB (active at 0) enables the pull-up current flowing through external pad to VSS if the input is pushed

to VSS. When ENINB=1 (input disabled), DINxB = 1.

The programmer must enable inputs by setting bit ENIN of P7 at least 5us before reading the input port P3 (see

section “I/O ports”). The debouncing of inputs must be done by software.

Parameter

Symbol Test Conditions

Min Typ Max Units

Pull-up current

Ipu1

Input to Vss

40 70 100 uA

Low level threshold

Vthinl

30

%Vdd

High level threshold

Vthinh

70 %Vdd

Hysteresis

Vhystin

5

%Vdd

Multipurpose inputs:

Inputs 3 and 6 can be used also as pull-down outputs: the pull down transistors are turned on by setting bits

PD3 and PD6 of P6 (see section ”I/O ports”).

Inputs 1, 2 and 4 are used by the on-chip comparator (see section “comparator”)

Input 5 can be turned into supply for external circuitry by mask option OVEXT (see “Power supply”).

MLX90719 General purpose timer

Page 6

Rev 1.0 30/Jul/00

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