ST3917B 查看數據表（PDF） - STMicroelectronics

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产品描述 (功能)

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ST3917B

SPEECH - TONE/PULSE DIALER - LED INDICATOR

STMicroelectronics 

ST3917A - ST3917B

Figure 10 : Test

VDD

1 C1 ST3917A/B R1 28 1 2 3

FLASH

R ow

2 C2

R2 27 4 5 6 TONE/P ULSE

C ol

3 C3

R3 26 7 8 9

P AUSE

4 SEL

470kΩ

5 OSC

3.58MHz

6 P ULSE

P ulse

100kΩ

Tone S W2

7 MODE/PT

8 HKS

S W1

9 GND

Vear Re

+

10 F

RGR X

100pF

3.9kΩ

+

100 F

10 RXOUT

11 GRX

12 RXIN

1 3 IREF

1 4 VCC

R4 25

MU/MFI 24

*0 #

VMF

LND

SECRET

VDD 2 3

GDTMF 22

R DTMF

CDTMF

MIC+ 21

MIC- 20

GTX 19

1F

1F

R G TX

100pF

REG 18

470nF

+

4.7 F

GDTMF = 20 log VLN

VMF

Ve a r

CDTMF = 20 log

VLN

VLN

LN 17

ILINE 16

LED 15

LED

+

100 F

130kΩ

ILN

600Ω

20Ω

390Ω

3.9kΩ

100nF

620Ω

390Ω

Figure 11 : Test

VDD

1 C1 S T3917A/B R1 28 1 2 3

FLAS H

Row

2 C2

R2 27 4 5 6 TONE/P ULSE

Col

3 C3

R3 26 7 8 9

P AUSE

4 SEL

470kΩ

5 OS C

3.58MHz

6 PULSE

P ulse

100kΩ

Tone S W2

7 MODE/P T

8 HKS

S W1

9 GND

Vear Re

+

10 F

RGRX

100pF

3.9kΩ

+

100 F

10 RXOUT

11 GR X

12 RXIN

1 3 IREF

1 4 VCC

R4 25

MU/MFI 24

*0 #

LND

SECRET

VDD 2 3

GDTMF 22

RDTMF

C DTMF

MIC+ 21

MIC- 20

GTX 19

1F

1F

R G TX

100pF

REG 18

470nF

+

4.7 F

LN 17

ILINE 16

LED

LED 15

GRX= 20 log Vear

Vinp

VLN

+

100 F

130kΩ

ILN

20Ω

390Ω

3.9kΩ

Vinp

100nF

620Ω

390Ω

13/16

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