W91541LN 查看數據表（PDF） - Winbond

零件编号

产品描述 (功能)

生产厂家

W91541LN

10-MEMORY TONE/PULSE DIALER WITH SAVE, KEYTONE, LOCK, AND HANDFREE FUNCTIONS

Winbond 

W91540N SERIES

Pin Description, continued

SYMBOL 18-PIN

DTMF

12

20-PIN I/O

FUNCTION

14

O During pulse dialing, this pin remains in low state

regardless of keypad input. In tone mode, it will output a

dual or single tone.

A detailed timing diagram for tone mode is shown in

Figure 2(a, b, c, d)

OUTPUT FREQUENCY

Specified

Actual

Error %

R1

697

699

+0.28

R2

770

766

-0.52

R3

852

848

-0.47

R4

941

948

+0.74

C1

1209

1216

+0.57

C2

1336

1332

-0.30

C3

1477

1472

-0.34

VDD, VSS

HFI , HFO

14, 6

-

16, 6

I Power input pins for the dialer chip. VDD is the main

power and VSS is the ground.

10, 11 I, O Handfree control pins. A low pulse on the HFI input pin

toggles the handfree control state.

Status of the handfree control is listed in the following

table:

CURRENT STATE

Hook SW. HFO

Low

On Hook

Off Hook

On Hook

Off Hook

Off Hook

High

High

Low

High

NEXT STATE

Input

HFO Dialing

HFI

High Yes

HFI

Low No

HFI

Low Yes

Off Hook Low Yes

On Hook Low No

On Hook High Yes

HFI pin is pulled to VDD by an internal resistor.

Detailed timing diagram is shown in Figure 3.

Publication Release Date: May 1997

-5-

Revision A2

Share Link: