Table of Contents
Advertisement
U8655
Maintenance Manual
H
9.3.2 GPS
The GPS channel consists of filter U4102, filter U4103 and LNA U4101. GPS signals are sent
to the RTR6285A's input interface after going through the filters and LNA. The following
figure shows the circuit.
9.3.3 Wi-Fi/Bluetooth/FM Module
The U8655N uses a Wi-Fi/Bluetooth/FM 3-in-1 module (Broadcom's BCM4330).
The Bluetooth and Wi-Fi functions share one antenna and one SP3T RF switch.
The MSM7225A provides PCM and UART interfaces that are directly connected with the
Bluetooth module's PCM and UART signal output. The following table describes the signals'
definitions.
MSM7225A Signal
GPIO_44
GPIO_43
GPIO_46
GPIO_45
GPIO_69
GPIO_68
GPIO_70
GPIO_71
GPIO_107
GPIO_83
Issue 1.0 (2012-02-23)
H: 1.3–1.8 V. L: < 0.5 V.
UART1_CTS_N
UART1_RFR_N
UART1_TX
UART1_RX
AUX_PCM_DIN
AUX_PCM_DOUT
AUX_PCM_SYNC
AUX_PCM_CLK
MSM_WAKES_BT
BT_WAKES_MSM
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
H
Definition
The "ready to receive" signal from the
host (the MSM7225A) to the slave (the
BCM4330).
The "clear to send" signal sent from the
slave to the host.
Transmission signal
Reception signal
PCM input
PCM output
PCM synchronization
PCM clock
Waking up the host
Waking up the Bluetooth
9 Principles and Failure Analysis
LO Power
33
Advertisement
Table of Contents
