UPD9930 datasheet(6/78 Pages) NEC

6 / 78 page

µPD9930

TC2

TC1

Test mode specification

Normal operation

Speech encoder test mode

Speech decoder test mode

Acoustic device test mode

1. PIN FUNCTIONS

1.1 LIST OF PIN FUNCTIONS

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

Pin No.

Pin Name

Input/Output

Function

MDAT

Input

Microcontroller interface serial input

MCLK

Input

Microcontroller interface clock input

DRSTB

Input

DAI (Digital Audio Interface) reset input

This is reset at low level. Internally pulled high.

Input

DAI serial input

Internally pulled high.

Output

DAI serial output

Hi-Z in normal operation (TC1 = TC2 = low level)

DCLK

Output

DAI clock output (104 kHz)

Hi-Z in normal operation

TC1

Input

TC2

Input

TIMER

Output

Timer output. Output of rectangular wave synchronized with tone intermittent

pattern.

RINGER

Output

Ringer tone output. Output of rectangular wave synchronized with tone fre-

quency.

DSPSEL

Input

Selection of DSP interface input/output timing mode.

Connect to VDD or GND. (VDD = mode 1, GND = mode 2)

REQB

Input

Input of DSP interface data transmit request signal.

Serial data can be input/output at low level.

RESETB

Input

System reset input. This is reset at low level. Initializes all control registers.

Reset when turning power on.

FSYNC

Input

Send/receive frame synchronization signal (8 kHz) input

DGND

—

Digital ground. Connect to a digital ground line near

µPD9930 pins.

AGND1

—

Analog ground. Connect to an analog ground line near

µPD9930 pins.

AGND2

—

AGND3

—

AGND4

—

MICI+

Input

Microphone amplifier non-inverted input

MICI–

Input

Microphone amplifier inverted input

MICO

Output

Microphone amplifier output. Connect microphone amplifier gain adjust resistor.

Outputs sidetone signal to REC2I- pin.

MIXI

Input

Pre-filter + mixer input

XAUXO

Output

Accessory input amplifier output. Connect accessory input amplifier gain adjust

resistor.

DAI mode control

Selection of test mode specified by

GSM11.10 in combination with TC1

and TC2

L: Low level

H: High level

TC1 and TC2 pins are internally pulled down.

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