Nokia RM-497 User Manual

Electrical Interface Between Baseband and Audio Components
Introduction
The D2800 JUNO (BCM21351) BB ASIC has interfaces for an internal and external microphone, earpiece drivers,
stereo headset drivers, and mono internal hands-free drivers. It also has an Accessory Component Interface
(ACI) interface to identify peripherals plugged into the 3.5mm AV jack. Two GPIO pins are used for detecting
when a plug is inserted into the X2001 AV connector and another is used for enabling the stereo headset
amplifier.
The AVI signals are referenced to 2.5V. All three GPIO pins use 1.8V CMOS signaling levels.
D2800 Baseband ASIC (BCM21351) Audio Interface Pins
Audio
Pin Name Pin I/O Type Description
ARXMICP1 T22 I Analog Internal MIC Input +
ARXMICN1 R22 I Analog Internal MIC Input -
ARXMICBI
AS
U22 Out
put
Analog Internal MIC Bias
ACI_DATA Y23 I/O Analog ACI Data Input/Output
ACI_AUDIO
IN
W22 I Analog ACI MIC bias point
GPIO30 V17 I/O CMOS Plug Detect
GPIO14 R4 I/O CMOS Connect Detect
ARXMICP2 R23 I Analog External MIC Input +
ARXMICN2 T23 I Analog External MIC Input -
ARXAUXMI
CBIAS
U23 Out
put
Analog External MIC Bias
GPIO22 V2 I/O CMOS Headset Amplifier Enable
DDACAMP
LP100A
V12 O Analog External Headset Left
Driver +
DDACAMP
LN100A
U12 O Analog External Headset Left
Driver -
DDACAMP
RP100A
U13 O Analog External Headset Right
Driver +
DDACAMP
RN100A
V13 O Analog External Headset Right
Driver -
DDACAMP
LP100B
Y12 O Analog Earpiece Driver +
DDACAMP
LN100B
W12 O Analog Earpiece Driver -
IHFAMPRP
LINOUT
AB21 O Analog Internal Hands-free driver
+
RM-497
System Module
Issue 1 COMPANY CONFIDENTIAL Page 5 – 39
Copyright © 2010 Nokia. All rights reserved.

Nokia RM-497 Specifications

General

Brand	Nokia
Model	RM-497
Category	Handhelds
Language	English