User Guide

NEM-2
System Module and User Interface CCS Technical Documentation
Page 30 Copyright Nokia. All rights reserved. Issue 1 07/03
Internal Signals and Connections
Internal microphone
Internal speaker
Vibra
Audio player
DA250- SMPS Interface
SMPS (Switch Mode Power Supply) for application DSP core voltage supply needs exter-
nal clock. ADSP timer 0 provides it. Core voltage level can be changed by VoutSelection
signal, which is connected to ADSP GPIO pin.
Symbol Parameter Min. typ. max. Unit Note
MICP Differential Input
P
200 mVpp 1kOhm to MICB
MICN Differential Input
N
200 mVpp 1kOhm to GND
MICB Microphone Bias 2.0 2.1 2.25 V DC
Symbol Parameter Min. typ. max. Unit Note
EARP differential out 2.0 Vpp AC, (Vdiff = 4.0 Vpp)
EARN differential out 2.0 Vpp AC
Signal Min. Nom Max Condition Note
VIBRA DC voltage 1.0 1.5 2.3 V Motor average dc
Output
frequency
4 64 512 Hz
Symbol Parameter Min. typ. Max. Unit Note
SMPSClk SMPS synchro-
nization clock
0 3.3 V
460 kHz
VOutSelection SMPS output
voltage selec-
tion
0
0.85
0.65
3.3
V low: VCore = 1.5V (default)
high: VCore = 1.3V