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9

This circuit performs the same type of communication as between the DPT and PBX, but a slave DPT for DXDP is connected to
the DXDP port.
In addition, it controls power feeding for a slave DPT.

The data to the slave DPT is output from pins 47 and 48 of IC300 and sent via “Q331

C331” and “Q332C337” to JK301.

The data from the slave DPT is sent through “C337

R350” and is input to the comparator (pin 22) built in IC300.

The threshold voltage of the comparator is determined by R353, R354 and R355. It is input into pin 21 and 23 of IC300.

Power is controlled to the Slave DPT by means of a constant current circuit Q303 and Q304 as below:

• IC300 pin 20 H: Constant current circuit ON.
• IC300 pin 20 L: Constant current circuit OFF.
• IC300 pin 25 H: 40mA feed (normal supply to Slave DPT).
• IC300 pin 25 L: 20mA feed (initial supply to Slave DPT).

JK301

1

2

3

4

5

Q303

Q

304

1

E1

2

B1

3

C

2

4

E

2

5

B

2

6

C1

H-D

L-D

R319

R320

C312

C313

C3

2

5

R3

22

DG

R321

PG

PG

PG

C33

2

C331

R34

2

R343

VDD33

DG

DG

DG

C330

R340

R341

R312

R313

Q332

1

E1

2 B1

3 C2

4

E2

5

B2

6

C1

DG

C337

R348

R349

DG

VDD33

DG

C333

DG

C334

VDD3      VDD33

C335

DG

C33

6

R350

R351

R35

2

R353

R354

R355

DG

DG

DG

D53

2

D533

L303

L304

Q331

1 B1

2 E

3 B2

5

C1

4

C2

Q330

R345

R34

6

R34

7

TO DPT/SLT

IC300

ASIC1

47

48

DDX0

DDX1

DVRH

23

22

DDR

21

DVRL

20

GPIO3

25

GPIO4

10

1. Speaker phone call

Transmitting signal is input from microphone 

 input to IC410-pin 33 and 34  amplified by a built-in analog amplifier of

IC410 

 A/D conversion, Gain adjustment and echo cancel by a built-in DSP of IC410.

Receiving signal is sent by data from PBX 

 Gain adjustment and D/A conversion by a built-in DSP of IC410  amplified by

a built-in analog amplifier of IC410 

 output from IC410-pin 38 and 40  output to Speaker.

2. Handset call 

Transmitting signal is input from handset microphone 

 input to IC410-pin 35 and 36  amplified by a built-in analog ampli-

fier of IC410 

 A/D conversion, Gain adjustment and echo cancel by a built-in DSP of IC410.

Receiving signal is sent by data from PBX 

 Gain adjustment and D/A conversion by a built-in DSP of IC410  amplified by

a built-in analog amplifier of IC410 

 output from IC410-pin 41  output to handset speaker.

MIP

SPP

SPN

SPAMPEN

IC410

DCX81

DG

AGND

AGND

AGND

SPP

AGND

SP2

MIP

AGND

MIC1

DG

AGND

SP1

MICBIAS

SPN

MIC2

MIN

AGND

AGND

C500

C501

C504

C503

C507

C502

C506

C530

C531

C532

C534

C535

C537

C538

R534

R532

R533

C536

DG

DG

DG

DG

G

D

G

D

D500

D501

D530

D531

R501

R502

R565

C569

C540

C541

R530

R531

38

SPOUTP

40

SPOUTN

34

MIP

33

MIN

R535

HSMICINP

IC410

DCX81

AGND

AGND

AGND

AGND

AGND

AGND

MICBIAS

AGND

AGND

AGND

AGND

C515

C516

C517

R517

R518

R519

R520

C521

C522

C523

C524

C526

C527

C528

DG

DG

DG

DG

D515

D516

D517

HSMIP

HSMIN

HSSPOUT

R568

JK501

1
2
3
4

5

L463

L464

L465

R564

C570

C518

C513

C514

R515

R516

C525

C519

C520

R574

DG

Handset Jack

36

HSMIP

35

HSMIN

41

HSSPOUTP

11

3. Headset Call

Transmitting signal is input from headset microphone 

 input to IC410-pin 26  amplified by a built-in analog amplifier of

IC410 

 A/D conversion, Gain adjustment and echo cancel by a built-in DSP of IC410.

Receiving signal is sent by data from PBX 

 Gain adjustment and D/A conversion by a built-in DSP of IC410  amplified by

a built-in analog amplifier of IC410 

 output from IC410-pin 42  output to headset speaker.

IC300 controls Data Communication (refer to chapter 4.2.3) between PBX and proprietary telephone, and DXDP Communication
(refer to chapter 4.2.4) .
IC410 controls IC300 with SPI (Serial peripheral interface).
PCM signal (encoded audio signal) is exhanged between IC300 and IC410.

IC410

C571

R566

AGND

AGND

AGND

AGND

AGND

MICBIAS

L461

L462

R569

C576

C577

C578

C579

C581

R570

C580

DG

DCX81

26

LIN0

42

LOUT

CN400

2

CN160

13

3

HESMIN

HESSPOUT

12

Main PCB

IC150

ASIC2

Ope PCB

JK160

1

4

2
3

5

AGND

AGND

AGND

C165

C167

C166

AGND   HEADGND

HEADGND   HEADGND

HEADGND HEADGND HEADGND

R160

R161

C164

HEADGND

AGND

HEADGND

C159

C158

D162

L160

D161

L161

L162

D163

L163

C168

C169

6

GKEYIN0

12

IC150 controls KEY, LED, EHS and Headset-detect.
An operation clock is provided from IC300. IC410 controls reset signal (L(0V): Reset) for IC150.
IC150 and IC410 are connected via I2C interface.
IC410 checks the presence of IC150 by getting the signal from IC150.

The LED control and the KEY control use the same strobe(STB) signal. 
Therefore, the LED control and the KEY control are alternately executed. 
The timing chart is as shown in the following .

Main PCB

Ope PCB

DCX81

IC410

CN400

7

8

11

10

8

9

CN160

6

5

4

7

43

41

38

44

1

7

4

10

68

69

CK4M

SDA

SCL

ASIC_RST

ASIC_INT

IC150

ASIC2

ASIC1

IC300

DYN_CLK

KEY_CLK

DYN_CLK

Standard CLK

(IC150 Internal)

Processing

Dynamic Lighting Section

t1 + t2 = 11.4ms
t3 + t4 = 1.2ms

Dynamic

Lighting Section

Dynamic Lighting

OFF Section

KEY Scanning

Section

KEY Scanning

OFF Section

t1

t2

t3

t4