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RM-497
System Module
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
Pin Name
ARXMICP1
T22
ARXMICN1
R22
ARXMICBI
U22
AS
ACI_DATA
Y23
ACI_AUDIO
W22
IN
GPIO30
V17
GPIO14
R4
ARXMICP2
R23
ARXMICN2
T23
ARXAUXMI
U23
CBIAS
GPIO22
V2
DDACAMP
V12
LP100A
DDACAMP
U12
LN100A
DDACAMP
U13
RP100A
DDACAMP
V13
RN100A
DDACAMP
Y12
LP100B
DDACAMP
W12
LN100B
IHFAMPRP
AB21
LINOUT
Issue 1
Audio
Pin
COMPANY CONFIDENTIAL
Copyright © 2010 Nokia. All rights reserved.
I/O
Type
I
Analog
Internal MIC Input +
I
Analog
Internal MIC Input -
Out
Analog
Internal MIC Bias
put
I/O
Analog
ACI Data Input/Output
I
Analog
ACI MIC bias point
I/O
CMOS
Plug Detect
I/O
CMOS
Connect Detect
I
Analog
External MIC Input +
I
Analog
External MIC Input -
Out
Analog
External MIC Bias
put
I/O
CMOS
Headset Amplifier Enable
O
Analog
External Headset Left
Driver +
O
Analog
External Headset Left
Driver -
O
Analog
External Headset Right
Driver +
O
Analog
External Headset Right
Driver -
O
Analog
Earpiece Driver +
O
Analog
Earpiece Driver -
O
Analog
Internal Hands-free driver
+
Description
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