IL5851 データシートの表示（PDF） - Integral Corp.

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IL5851

PULSE DIALER WITH REDIAL

Integral Corp. 

IL5851

PIN DESCRIPTION

NAME

PIN

VCC

1

VREF

2

___ _____ 3,4,5,13,

Row1-Row4, 14,15,16

Col1-Col4

DESCRIPTION

Positive supply pin.

The voltage on this pin is measured relative to Pin 6 and is supplied from a

150µA current source. This voltage should be regulated to less than 6.0 volts

using on external form or regulation.

The VREF output provides reference .

voltage that tracks internal

parameters of the IL5851N. VREF

provides a negative voltage reference

to the VCC supply. Its magnitude will

be approximately 0.6 volt higher than

the minimum operating voltage of

each particular IL5851N.

The typical application would be to

connect the VREF pin to the GND pin

(Pin 6). The supply to the VCC pin

(Pin 1) should then be regulated to

150µA (IOP max). with this amount of

supply current, operation of the

IL5851N is guaranteed.

The internal circuit of the VREF

function is shown in Figure 1 with its

associated I-V characteristic

Keyboard inputs.

The IL5851N incorporates an innovative keyboard scheme that allows either the

standard 2-of-7 keyboard with negative common or the inexpensive single

contact (form A) keyboard to be used.

A valid key entry is defined by either a single row being connected to a single

column or GND being simultaneously presented to both a single row and column.

When in the on-hook mode, the row and column inputs are held high and no

keyboard inputs are accepted.

When off-hook, the keyboard is completely static until the initial valid key input

is sensed. The oscillator is then enabled and the rows and columns are scanned

alternately (pulled high, then low) to verify the varied input. The input must

remain valid for 10msec of debounce time to be accepted.

Form A type keyboard

2 of 7 keyboard (negative common)

2 of 7 keyboard

Electronic input

GND

6

Negative supply

2

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