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

Low power RC oscillator

In case of applications without battery or crystal (OXBAT = 0) the MLX90719 uses an on-chip low power RC os-

cillator to count time during a few minutes after the mains has been disconnected (low power mode).

Parameter

Symbol Test Conditions

Min Typ Max Units

Master frequency of the Fckl

low power RC oscillator

Over full temp. and supply range

1.0 2.5 5 kHz

Notes:

As the CPU must calibrate it in normal mode, the low power oscillator is running continuously.

The low power RC oscillator is disabled if OXBAT = 1.

LCD outputs

The MLX90719 has 15 configurable LCD outputs able to drive either a backplane or a segment by mask option:

OLCDx = 0 => segment

OLCDx = 1 => backplane

The LCD voltages are defined according to bits LCDx and CKLCD written in P3 and P4 (see section “I/O

ports”). With Vcdl1 and Vlcd2 being respectively 1/3Vlcd and 2/3Vlcd, the MLX90719 is suitable for LCD having

1, 2, 3 or 4 backplanes.

Parameter

Symbol Test Conditions

Min Typ Max Units

Output impedance

Rolcd All cases

20 kohm

OLCDx

0

0

0

0

1

1

1

1

LCDx

0

0

1

1

0

0

1

1

CKLCD

0

1

0

1

0

1

0

1

OUT

Vlcd1

Vlcd2

Vlcd

Vss

Vlcd2

Vlcd1

Vss

Vlcd

Relay drivers

The MLX90719 includes 3 pull-down power outputs A, B, and C able to drive relays, triacs or LED’s.

The gates of the drivers are controlled respectively by signals POUTA, POUTB and POUTC generated by the

digital core (see section “PWM generator”).

Each driver has its source and its drain connected to a pad (DRAINx and SOURCEx) except driver C of which

the source is connected to the ground. This allows a series connection of the drivers. In such a configuration

the current flowing through the relay is used to feed the LED’s.

Internal current generator

In applications based on the following schematic, where the LED(‘s) may have to be driven when the relay is

off, an internal current peak generator can be activated to supply the LED’s through pin SourceA. This function

is enabled by bit INTCUR of P5 (see section “I/O ports”). When INTCUR is set the current generator is acti-

vated like a relay by signal PINT at frequency Fpwm and at 14.3% duty cycle (see “PWM generator”).

Note: If the application has no relay, this feature allows the MLX90719 to drive 2 LED’s without any external

resistors.

MLX90719 General purpose timer

Page 8

Rev 1.0 30/Jul/00

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