µ
PD9930
1. PIN FUNCTIONS
1.1 LIST OF PIN FUNCTIONS
Table 1-1 List of Pin Functions (1/2)
Pin No.
1
2
3
4
5
Pin Name
MDAT
MCLK
DRSTB
DI
DO
Input/Output
Input
Input
Input
Input
Output
Microcontroller interface serial input
Microcontroller interface clock input
DAI (Digital Audio Interface) reset input
This is reset at low level. Internally pulled high.
DAI serial input
Internally pulled high.
DAI serial output
Hi-Z in normal operation (TC1 = TC2 = low level)
6
7
DCLK
TC1
Output
Input
DAI clock output (104 kHz)
Hi-Z in normal operation
DAI mode control
Selection of test mode specified by
GSM11.10 in combination with TC1
and TC2
8
TC2
Input
L: Low level
H: High level
TC2
L
L
H
H
TC1
L
H
L
H
Test mode specification
Normal operation
Speech encoder test mode
Speech decoder test mode
Acoustic device test mode
Function
TC1 and TC2 pins are internally pulled down.
9
10
11
TIMER
RINGER
DSPSEL
Output
Output
Input
Timer output. Output of rectangular wave synchronized with tone intermittent
pattern.
Ringer tone output. Output of rectangular wave synchronized with tone fre-
quency.
Selection of DSP interface input/output timing mode.
Connect to V
DD
or GND. (V
DD
= mode 1, GND = mode 2)
12
13
14
15
16
17
18
19
20
21
22
23
24
REQB
RESETB
FSYNC
DGND
AGND1
AGND2
AGND3
AGND4
MICI+
MICI–
MICO
MIXI
XAUXO
Input
Input
Input
—
—
—
—
—
Input
Input
Output
Input
Output
Microphone amplifier non-inverted input
Microphone amplifier inverted input
Microphone amplifier output. Connect microphone amplifier gain adjust resistor.
Outputs sidetone signal to REC2I- pin.
Pre-filter + mixer input
Accessory input amplifier output. Connect accessory input amplifier gain adjust
resistor.
Input of DSP interface data transmit request signal.
Serial data can be input/output at low level.
System reset input. This is reset at low level. Initializes all control registers.
Reset when turning power on.
Send/receive frame synchronization signal (8 kHz) input
Digital ground. Connect to a digital ground line near
µ
PD9930 pins.
Analog ground. Connect to an analog ground line near
µ
PD9930 pins.
6
NEC [ NEC ]
