UPD9930 datasheet(7/78 Pages) NEC

7 / 78 page

µPD9930

Table 1-1 List of Pin Functions (2/2)

Pin No.

Pin Name

Input/Output

Function

XAUXI–

Input

Accessory input amplifier inverted input

XACOMI

Input

Voice send internal reference voltage input

XACOMO

Output

Voice send internal reference voltage (1.2 V) output

RACOMO

Output

Voice receive internal reference voltage (1.2 V) output

RACOMI

Input

Voice receive internal reference voltage input

REC2O+

Output

Receiver amplifier 2 non-inverted output

REC2O–

Output

Receiver amplifier 2 inverted output

—

Internal connection; leave unconnected

REC2I–

Input

Receiver amplifier 2 inverted input

Connect sidetone gain adjust resistor.

REC1O

Output

Receiver amplifier 1 output

RAUXO

Output

Accessory output amplifier output

AVDD1

—

Analog power. Connect to an analog power supply line near

µPD9930 pins.

AVDD2

—

DVDD

—

Digital power. Connect to a digital power supply line near

µPD9930 pins.

SEN

Output

DSP interface enable signal output

Input

DSP interface serial input

Output

DSP interface serial output

SCLK

Output

DSP interface clock output (256 kHz)

TEST

Input

Set at high level

MSTR

Input

Microcontroller interface strobe signal input

Caution Short-circuit the XACOMI and XACOMO pins at a location as close to the pins of the

µPD9930 as

possible. Connect a capacitor (chip capacitor or electrolytic capacitor) between this short-circuited

portion and analog ground.

The same applies to the RACOMI and RACOMO pins.

The transmission/reception level is determined by these reference pins. Therefore, make sure that

these pins are not affected by noise or fluctuation of ground potential due to current.

UPD9930 Datasheet(PDF) 7 Page - NEC

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