NT91214 查看數據表（PDF） - Unspecified

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NT91214

Tone/Pulse Dialer

Unspecified 

NT91214/15 Series

Pin Descriptions (continued)

Pin No.

NT91215A NT91215B NT91215C NT91215D Designation I/O

NT91214A NT91214B NT91214C NT91214D

Description

1

1

2

2

HK

I Hook switch input

This inverter input pin detects the state

of the hook switch contact. "Off Hook" is

represented by a VSS condition. "On

Hook" is represented by a VDD

condition.

(N.A.)

10

(N.A.)

11

KT

O Key-in tone output

This N-channel open drain pin sends out

a "beep" tone for each PULSE mode key

entry, along with entries of accepted

function keys (RD, T, F1 F2, and P

keys). The tone output frequency is

437Hz and tone duration is 23 ms.

9

11

10

12

DP

O Dialing pulse output

This is an N-channel open drain output.

The normal output will be "ON" during

break and "OFF" during make in the

PULSE DIALING mode.

7

V1.0

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