Semtech XE1401SK User manual

Rev 1 February 2006 www.semtech.com
1
Users Guide
XE1401SK Hardware
XE1401SK Bluetooth™ Starter Kit
Hardware Users Guide

© Semtech 2006 www.semtech.com
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Users Guide
XE1401SK Hardware
Table of Contents
1PREFACE ................................................................................................................................................. 3
1.1 What this guide contains............................................................................................................................ 3
2GETTING STARTED NOW ....................................................................................................................... 4
2.1 Configure your XE1401SK Hardware ........................................................................................................ 4
2.1.1 Using the USB Port.................................................................................................................................... 4
2.1.2 Using the RS232 Port................................................................................................................................ 4
2.2 Starting the XE1401SK Software Demo .................................................................................................... 4
2.3 Headset Demo with a NOKIA 6310(i) ........................................................................................................ 5
3XE1401SK PRODUCT OVERVIEW.......................................................................................................... 6
4XE1401SK – FUNCTIONAL DESCRIPTION............................................................................................. 7
4.1 Overview.................................................................................................................................................... 7
4.1.1 Block diagram............................................................................................................................................ 7
4.1.2 Power Management................................................................................................................................... 7
4.1.3 Mechanical Dimensions............................................................................................................................. 7
4.2 Hardware Features.................................................................................................................................... 8
4.2.1 Radio Board............................................................................................................................................... 8
4.2.2 XE1401SK Motherboard............................................................................................................................ 8
4.2.3 RS232 Port................................................................................................................................................ 8
4.2.4 USB Port and Driver.................................................................................................................................. 8
4.2.5 Analog Audio Interface .............................................................................................................................. 8
4.2.6 Fault Management/Supervision ................................................................................................................. 8
5XE1401SK - HARDWARE DESCRIPTION ............................................................................................... 9
5.1 Blocks overview......................................................................................................................................... 9
5.2 XE1401SK Motherboard Overview.......................................................................................................... 10
5.2.1 Power Supply .......................................................................................................................................... 11
5.2.2 Voltage Regulators.................................................................................................................................. 11
5.2.3 Power Supply for External Application Board........................................................................................... 11
5.2.4 Power Consumption Measurement.......................................................................................................... 12
5.2.5 Hardware Reset....................................................................................................................................... 12
5.2.6 Radio Modules Connectors...................................................................................................................... 12
5.2.7 XE1401SK Host Controller Interface ports - RS232 / USB ...................................................................... 13
5.2.8 XE3006 CODEC...................................................................................................................................... 14
5.2.9 XE1401 – Application Board Connector................................................................................................... 15
5.3 Motherboard Settings .............................................................................................................................. 16
5.3.1 Jumpers Overview................................................................................................................................... 16
5.3.2 Current Consumption Measure (JP5) ...................................................................................................... 16
5.3.3 Power-on LED CR3 (JP6)........................................................................................................................ 17
5.3.4 Power Supply For External Application Board (JP7)................................................................................ 17
5.3.5 Codec Enable/Disable (JP8).................................................................................................................... 18
5.3.6 XE1401 UART Interface (JP11)............................................................................................................... 19
5.3.7 Protection Diode CR6 Bypass (JP12)...................................................................................................... 19
5.3.8 Power Supply For XE1401SK (JP13) ...................................................................................................... 20
5.4 IAR Systems radio board – Skyworks radio CX72303............................................................................. 21
5.4.1 IAR Systems Radio Board – Overview .................................................................................................... 21
5.4.2 Flag Designed Flexible Laminate Antenna............................................................................................... 21
5.5 Silicon Wave radio board......................................................................................................................... 22
6SCHEMATICS......................................................................................................................................... 23
6.1 XE1401SK Motherboard.......................................................................................................................... 23
6.2 IAR radioboard – CX72303...................................................................................................................... 25

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1 PREFACE
Welcome to the Hardware User Guide for the Bluetooth™ starter kit XE1401SK from Semtech. The purpose of this
guide is to describe how to configure and use the hardware of the XE1401SK.
1.1 WHAT THIS GUIDE CONTAINS
This guide consists of the following chapters:
Get Started Now describes how to connect the XE1401SK to a Bluetooth™ enabled cell phone.
XE1401SK - Product Overview introduces the XE1401SK hardware design.
XE1401SK - Functional Description introduces the XE1401SK functionalities.
XE1401SK - Hardware Description gives a detailed description of the XE1401SK hardware.
Schematics show electrical architecture of the XE1401SK hardware.

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2 GETTING STARTED NOW
This chapter provides a very brief installation description to check out a Bluetooth™ Headset link using the NOKIA
6310(i) cell phone.
Note! Most often, cell phones from different vendors handle the headset link differently e.g. using different
Bluetooth™ SCO packet types (HV1, HV2 and HV3). Connection procedures, timings, reliability, speech quality
and communication range may vary from cell phone type to cell phone type.
2.1 CONFIGURE YOUR XE1401SK HARDWARE
Note! To locate all jumpers and components referred in this section, please see the chapter 5.2 XE1401SK
Motherboard Overview and chapter 6. SCHEMATICS.
Connect the headset to the XE1401SK motherboard. The sockets are close to the on board batteries and marked
with red (microphone) and black (speaker) labels.
2.1.1 Using the USB Port
•Install the USB driver for the XE1401SK on your PC - please see “XE1401 Demo Software User’s Guide
chapter 2.2 - Installing the USB Driver -” and follow the instructions.
•Place JP13 of the XE1401SK in “USB_5V” position – the board will be powered directly out of the USB
port.
•Place SW3 of the XE1401SK in “CX” position (for the Skyworks former Conexant radio) or “SiW” if a Silicon
Wave radio is used.
•Connect the USB cable between your PC and the XE1401SK.
•Switch “ON” the XE1401SK by using SW1 - LED CR3 will light and after few seconds the LED CR5
flashes. Now the USB port is initialized and the XE1401SK is ready to communicate.
2.1.2 Using the RS232 Port
•Place JP13 of the XE1401SK in “BATTERY” position (the board will be powered out of the on board
batteries) or in “EXT_POWER” position if you use an external power supply (200 mA, 4-10 V).
•Place SW3 of the XE1401SK in “CX” position (for the Skyworks former Conexant radio) or “SiW” if a Silicon
Wave radio is used.
•Connect the RS232 cable between your PC and the XE1401SK.
•Switch “ON” the XE1401SK by using SW1 - LED CR3 will light. Now the XE1401SK is ready to
communicate.
2.2 STARTING THE XE1401SK SOFTWARE DEMO
Launch the XE1401SK Software Demo as described in the “XE1401SK Demo Software User’s Guide”.
Note! As the XE1401 supports all headset packet types, the cell phone determines which packet format will be
used for the headset link.

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cd e f
gh i j
kl
2.3 HEADSET DEMO WITH A NOKIA 6310(I)
After you have started the XE1401SK Software Demo, Switch ON your NOKIA 6310(i) cell phone. Enter the PIN
code of your cell phone and after few seconds the main menu appears c.
Put your mobile phone in Bluetooth™ mode by choosing the Bluetooth™ menu dand select the Bluetooth™
option e.
Highlight the option “On” and push Select f. Now your cell phone is able to communicate with a Bluetooth™
headset device g. If you go back on the main menu h, the Bluetooth™ sign appears on the top-left corner of
the screen.
In order to discover Bluetooth™ devices, choose the Bluetooth™ menu dagain and select the “Search for
audio accessories” option i. Push the Select button and the mobile phone starts immediately the search
process j.
As soon as devices are found, the device names are displayed k. Choose the device you want to connect to and
push Select.
The connection phase starts land if the connection is established the message “Connected to” appears.
Otherwise the message “No devices found” is displayed.
Note! Sometimes the search procedure imust be restarted to discover the desired device.
When the connection is established the Remote BD address field (in the XE1401 Demo Software) contains the
address of the NOKIA 6310(i) cell phone.
Then push any key on your cell phone and the word “Connected” appears in the headset section of the Software
Demo. Now the cell phone and the headset are connected and ready for communication.
Note! If the Nokia 6310(i) cell phone is not used for more than 5 seconds, the headset communication is
automatically put in stand-by mode. Push any button on the cell phone to reactive the communication.

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3 XE1401SK PRODUCT OVERVIEW
The Bluetooth™ starter kit XE1401SK is designed as a platform tool for the development of products using the
Bluetooth™ technology.
The XE1401SK aims to satisfy users who are interested in developing software applications, using a Bluetooth™
starter kit and Bluetooth™ wireless technology as a new capability.
The XE1401SK allows users to use the starter kit design as a first development platform.
The XE1401SK reduces the time to market and many risks associated in early prototype products development.
The XE1401SK provides all tools and components required for a complete Bluetooth™ solution, such as radio
module, schematics and reference material, to give you a jump-start.
Note! In order to develop and produce an application that utilizes the Bluetooth™ wireless technology, you need an
upper Bluetooth protocol stack that executes in the host microprocessor. Several Bluetooth protocol stacks are
available on the market, such as the IAR Embedded Bluetooth protocol stack from IAR Systems (see the included
flyer).
The XE1401SK can easily be upgraded for use with other applications by using Bluetooth™ protocol stack
development tools and the IAR Embedded Workbench C/EC++ compiler and debugger products from IAR
Systems.
For more details on using the XE1401SK in combination with various upper Bluetooth™ protocol stacks, please
contact your local distributor or XEMICS.

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4 XE1401SK – FUNCTIONAL DESCRIPTION
4.1 OVERVIEW
On the main board the Semtech ultra-low power Bluetooth™ baseband controller XE1401 and the ultra-low power
audio CODEC device XE3006 can be found.
Two on board radio connectors, for Skyworks (former Conexant) and Silicon Wave radio evaluation boards, provide
the physical interface to the Bluetooth™ radio. By default a radio evaluation board for the Skyworks Bluetooth™
radio CX72303 is included in the Starter Kit. RS232 and USB communication ports allow the connection to any
host controller or a Personal Computer (PC).
The included CD ROM does include the XE1401SK Software Demo for data and voice links, including the source
files using Microsoft® Visual C++ 6.0 (Serial Port Profile and Headset Profile). For further information how to
embed the included SPP and HSP software in other programs please refer to the included document: XE1401SK
Bluetooth™ Software Development Users Guide.
4.1.1 Block diagram
XE1401SK Hardware Architecture
4.1.2 Power Management
The XE1401SK can be powered by 3 different power sources:
•2 On-board AAA type batteries.
•External power supply ranging from 4V to 10V.
•Via the USB port providing 5V.
4.1.3 Mechanical Dimensions
Starter Kit board: 100 mm (W) x 120 mm (L)
Radio board: 42 mm (W) x 64 mm (L)
Board thickness: 1.6 mm
Construction: Industry-standard 4-layer FR4
PC / Host Controlle
r
Radio module
UART - HCI
X
E1401 Bluetooth™
Baseband Controller
CODEC
XE3006
Radio Interface
USB RS232
Power
Management
Ext. Power Su
pp
l
y
External Application board
with BT Host Controller
PCM/SPI

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4.2 HARDWARE FEATURES
This chapter provides an overview about the various building blocks of the XE1401SK.
Note! To locate all jumpers and components referred in this section, please see the chapter 5.2 XE1401SK
Motherboard Overview and chapter 6. SCHEMATICS.
4.2.1 Radio Board
The included radio board is based on the CX72303 radio chip from Skyworks (http://www.skyworksinc.com). An on-
board flex-film antenna - per default connected to the radio - is already mounted. As an option an SMA connector
for external antenna is available - selectable by re-soldering a shunt capacitor on the radio board.
4.2.2 XE1401SK Motherboard
The XE1401SK motherboard consists of the XE1401 baseband controller, the XE3006 CODEC, a power
management unit, 2 x AAA batteries, RS232 and USB ports. Radio interface sockets for Skyworks and Silicon
Wave radios are provided.
4.2.3 RS232 Port
The RS232 plug is a 9-pin 90-degree D-type female connector.
4.2.4 USB Port and Driver
USB communication is implemented in the XE1401SK software as an alternative to the UART communication. To
use the USB port, you have to connect the USB cable to the XE1401SK. Windows™ will automatically detect and
initialize the USB port.
For details and how to install the USB driver on your PC, please refer to the “XE1401SK Software Demo User’s
Guide”.
4.2.5 Analog Audio Interface
The analog audio interfaces for microphone and speaker are available through two 2.5 mm audio jacks, identified
by colored round labels. These jacks are close to the on board batteries and marked with red (microphone) and
black (speaker) labels.
Red for the microphone (input).
Black for the speaker (output).
4.2.6 Fault Management/Supervision
If the LED CR3 is not disabled (see 5.3 Motherboard Jumper Settings), this LED is ON as soon as the
XE1401SK is powered up. If not, check the position of the power supply selector JP13 accordingly to the power
supply chosen.
The LED CR5 close to the USB connector indicates the status of the USB controller. Once the XE1401SK is
powered up, the LED starts flashing after few seconds. If a communication error is detected, the LED stops flashing
and lights continuously.
Note! If the USB port is not used, this LED always stays OFF.
See 5.2.3 Hardware Reset to learn more about resetting the XE1401SK.

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5 XE1401SK - HARDWARE DESCRIPTION
This chapter describes the XE1401SK hardware building blocks.
The Bluetooth™ baseband controller itself is not described in this section. Please refer to the XE1401 datasheet on
the enclosed CD-ROM for further details.
5.1 BLOCKS OVERVIEW
The XE1401SK is composed of two boards: The XE1401SK motherboard and the radio board. The XE1401SK
motherboard carries all necessary components for the XE1401 baseband controller, the XE3006 CODEC, power
management and RS232/USB ports.
The radio board includes a Bluetooth™ radio chip, all required external components to operate it, a flex film
antenna and a SMA connector for an external antenna. Two radio types are supported by the XE1401: Skyworks
CX72303 (formerly Conexant) and Silicon Wave SiW1502.
XE1401SK with IAR radio module (Skyworks radio chip – left) and Silicon Wave evaluation module (right)
On the left side the XE1401SK is populated with the IAR radio module based on the Skyworks radio chip. The
picture on the right shows the XE1401SK with the Silicon Wave radio evaluation module.

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5.2 XE1401SK MOTHERBOARD OVERVIEW
XE1401SK Motherboard Overview
This drawing provides an overview of the location of the different onboard connectors and components. A
functional description of the different jumpers can be found in chapter 5.3 Motherboard Jumper Settings.
Identifier Location Description Identifier Location Description
#JP1 10 100 pins connector for external
application board J4 24 RS232 connector
B1/B2 16 2 x AAA batteries J5 12 Audio interface speaker output
CR3 19 Power-ON LED JP2 11 50 pins connector for external
application board
CR5 1 USB LED indicator JP3 5 Skyworks radio connector
CR6 13 Protection diode JP4 9 Silicon Wave radio connector
J1 22 External power supply connector JP5 20 Measure point for current
consumption measurement
J2 25 USB jack – series B (slave) JP6 21 LED CR3 Enable/Disable
J3 12 Audio interface mic input JP7 15 Power supply for external
application board

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Identifier Location Description Identifier Location Description
JP8 6 CODEC Enable/Disable SW2 23 RESET push-button
JP11 3 UART Interface SW3 4 Radio type switch
JP12 14 Protection diode CR6 bypass TP5 7 CODEC Sandman functions
JP13 18 XE1401SK power supply
selector U1 8 XE1401 baseband controller
SW1 17 ON/OFF switch U2 2 XE3006 CODEC
Note! To locate all jumpers and components referred in these following sections, please see 5.2 XE1401SK
Motherboard Overview and 6. SCHEMATICS.
5.2.1 Power Supply
The power source for the XE1401SK motherboard can be selected by JP13. The XE1401SK can be power
supplied by using the onboard AAA batteries, via the USB port or by an external supply directly connected to the
connector J1.
If an external power supply is used, it should be set between 4V and 10 V DC (see polarity signs drawn on the
motherboard PCB) and must be able to provide at least 200mA to fit with the switching transient current that may
be encountered during start-up.
All USB components are only powered if the USB port is used. If a USB cable is connected, the RS232 port is
automatically disabled. Therefore it is not possible to power supply the XE1401SK via the USB port and
simultaneously use the RS232 port for the UART communication. For further details see chapter 6. SCHEMATICS.
5.2.2 Voltage Regulators
Two diodes (CR2 and CR4) protect the board from reverse polarity if an external power supply is applied.
The LP2986 voltage regulators (U4 and U5) supply the board with 3.0V and 3.3V. These regulators can provide a
maximum output current of 200mA each.
The regulator U4 supplies the entire board with 3.0V except the USB components while U5 supplies all USB
components with 3.3V. U5 is only active when the USB cable is connected, otherwise it is shut down.
5.2.3 Power Supply for External Application Board
The power supply source for an external application board (connected to JP2), can be selected by JP7 (see 5.3
Motherboard Jumper Settings).
Note! The XE1401SK motherboard does not allow being reversed powered by the external application board.
Therefore a protection diode (CR6) is present. This diode can be shorted via JP12 if the voltage dropout is not
acceptable for the external application board powered by the XE1401SK (see chapter 5.3 Motherboard Jumper
Settings and 6. Schematics).

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5.2.4 Power Consumption Measurement
The power consumption can be measured at the jumper JP5. The LED CR3 can also be turned off by removing
jumper JP6.
See 5.3.2 Current Consumption Measure to learn more about the power consumption measurement.
5.2.5 Hardware Reset
The on board RESET push-button SW2 forces a reset on the XE1401, XE3006 and the radio board. Pushing this
button does not reset the interface block to the PC i.e. to reset the USB controller, the board must be switched
“ON” and “OFF”.
Note! The RESET command for the CODEC (XE3006) and Skyworks radio interface is low active at 0V and uses a
1.8V as inactive high level. The reset command for the XE1401, the extension application board and Silicon Wave
radio interface is low active at 0V and uses a 3V as inactive high level.
5.2.6 Radio Modules Connectors
The XE1401 baseband controller (U1) is able to interface to two different radio types: Skyworks and Silicon Wave.
The included radio board is based on the Skyworks radio chip CX72303.
Note! If a Skyworks/Conexant radio module is plugged in JP3 the switch SW3 must be set in position “Cx”. If a
Silicon Wave radio module is plugged in JP4, the switch SW3 must be set in position “SiW”.

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5.2.7 XE1401SK Host Controller Interface ports - RS232 / USB
5.2.7.1 RS232 PORT
The XE1401SK has one 9-way D-type connector wired as a modem type serial port. The XE1401 UART signals
are routed via the RS232 level shifter MAX3225E (U11) to the on board RS232 connector J4. The MAX3225E goes
into power down mode when no RS232 cable is present.
RS232 port - pin assignment
JP11 allows disconnection of the XE1401 UART signals UA_RX and UA_CTS from the RS232 level shifter -
MAX3225E. The XE1401 UART can be directly accessed through JP2 (50 pins connector for external application
boards).
Note! It is important that the enclosed “straight” cable (pin1-pin1, pin2-pin2, etc.) is used when connecting to the
serial port of a PC. A null modem cable (RX/TX crossed) will not work!
5.2.7.2 USB PORT
The XE1401SK has an USB series B (slave) port. If the USB cable is connected, signals from the UART interface
of the XE1401 are routed to the USB controller which converts data to USB data and vice versa. The USB
controller is a Cypress AN2135SC. It has an integrated 8051 CPU. The on-chip memory is loaded with firmware at
power up from the external, serial I2C memory.
Since the USB connector on the PC also provides power, no external power supply is needed if jumper JP13 is set
into position “USB_5V”. The UART signals from the Bluetooth™ baseband controller XE1401 are automatically
converted by the firmware running on the USB controller.
Note! When the XE1401 UART is interfaced through a user specific external application board, the USB port
should be deactivated by removing the USB cable (connected on J2).

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5.2.8 XE3006 CODEC
The XE3006 (U2) is an ultra low power CODEC. The balanced speaker output signals from the CODEC are filtered
by an onboard low-pass filter to match with the included headset. For best performance and voice quality, the filter
must be adapted to match with the used speaker.
The microphone port is configured to provide a 1.1V bias voltage required by the enclosed headset microphone. If
another microphone is used, requiring a higher bias voltage, please refer to the XE3005/6 datasheet.
The CODEC XE3006 is powered at 1.8V supplied by the XE1401 on chip regulator.
The CODEC XE3006 is automatically initialized during start up by the XE1401. For details see the Software Demo
User’s Guide and the XE3005/6 datasheet on the enclosed CD-ROM.
It is possible to disable the Serial Peripheral Interface (SPI) of the XE3006 and hence to disconnect the CODEC
from the XE1401 by removing JP8 (see 5.3 Motherboard Jumper Settings). If the 0Ωresistors R29 to R34 are
removed, the XE1401 serial audio interface (PCM) is disconnected from the on board CODEC and can be directly
accessed on JP2.
The SPI as well as the PCM interface of the XE1401 baseband controller is now available to interface to any other
peripheral device.
The pins for the XE3006 Sandman™ function are accessible via TP5. For details see the XE3005/6 datasheet on
the enclosed CD-ROM.

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5.2.9 XE1401 – Application Board Connector
It is possible to connect an external application board to the XE1401SK by using the 50 pins connector JP2. The
pinning of this 50 pins male connector reflects the pinning of the XE1401 (XE1401 - pin 1 = JP2 - pin 1, XE1401 -
pin 2 = JP2 - pin 2 …).
The application board power source at pin 48 has to be set by jumper JP7. Please refer to chapter 5.3
Motherboard Jumper Settings for more details.
The pinning of the 50 pins 2.54mm male connector is:
50
48
46
44
42
40
38
36
34
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
49
47
45
43
41
39
37
35
33
31
29
27
25
23
21
19
17
15
13
11
9
7
5
3
1
VDD_REG
MCLK
NSS
MISO
PCM_DIN
FSYNC
MODE[0]
MODE[2]
RTS
UA_RX
NC1
RADIO_TYPE
CLK_IN
NC3
NC5
RF_OUT[2]
GND
MOSI
SCK
PCM_DOUT
BCLK
VSSD1
MODE[1]
CTS
UA_TX
NCS
VDD_IO_DIG
NC2
RF_IN[1]
NC4
NC6
NC7
RF_OUT[5]
RF_IN[0]
RF_OUT[1]
RF_OUT[4]
RF_IN[3]
NC8
NRESET
VSSD3
GND
RF_IN[2]
RF_OUT[3]
RF_OUT[0]
RF_OUT[6]
VSSD2
NC9
GND
VOUT*
GND
* Output voltage selectable by jumper JP7
Top view of the 50 pins connector JP2 for an external application board
Note! VOUT is the output voltage present on pin 48, selected by JP7. If JP7 is set to 1.8V the on chip regulator of
the XE1401 will provide the 1.8V. Be sure that the current sunk by the external application board respects the
maximal current draw provided by the various power sources.

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5.3 MOTHERBOARD SETTINGS
This chapter describes how to configure jumpers on the XE1401SK.
Note! To locate all jumpers and components referred in these following sections, please see:
5.2 XE1401SK Motherboard Overview and 6. SCHEMATICS.
5.3.1 Jumpers Overview
Name Location Description Default settings
JP5 20 Measure point for current consumption SHORT
JP6 21 Power-On LED CR3 Enable/Disable SHORT
JP7 15 Power supply for external application board VCC 1.8V
JP8 6 CODEC Enable/Disable SHORT
JP11 3 UART Interface SHORT
JP12 14 Protection diode CR6 bypass OPEN
JP13 18 XE1401SK power supply selector BATTERY
5.3.2 Current Consumption Measure (JP5)
The current consumption of the XE1401SK can be measured through JP5 by removing it and connecting an
ampere meter.
The current consumption measured is the consumption of the entire XE1401SK, including radio module and
CODEC however not including the USB components.

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5.3.3 Power-on LED CR3 (JP6)
The power-on LED, CR3 can be disconnected by removing JP6, typically used for current consumption
measurements (see chapter 5.3.2 Current Consumption Measure (JP5)).
5.3.4 Power Supply For External Application Board (JP7)
An external application board can be directly power supplied from the XE1401SK. The power source selection for
pin 48 (VOUT) of the 50 pins connector JP2 is selected by JP7.

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JP7 Position Description Imax Regulated
VCC 1.8V 1.8 V DC supplied by the XE1401 on-chip regulator 50 mA YES
USB 5V 5 V DC supplied by the USB port J2 500 mA NO
VCC 3.0V 3.0 V DC supplied by the onboard regulator U4 200 mA YES
EXT_POWER DC voltage supplied by the power supply connected on J1 Iext_power NO
OPEN No power supply is selected, VOUT is floating. - -
The selected source supplies the external application board through the protection diode CR6. The supply voltage
is so reduced by the diode dropout voltage. This protection diode can be bypassed to avoid the voltage dropout
(see chapter 5.3.7 Protection Diode CR6 Bypass (JP12) ).
5.3.5 Codec Enable/Disable (JP8)
The XE3006 Slave Select (SS) line can be disconnected from the XE1401 by removing the jumper JP8 in order to
disable the CODEC.
Note! Removing JP8 does not power off the CODEC. The XE3006 is still powered and so still sinks current (see
XE3005/6 datasheet for more details about the XE3006 current draw).

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5.3.6 XE1401 UART Interface (JP11)
JP11 provides the possibility to interface the XE1401 UART interface without going through the RS232 level-shifter.
Removing the jumpers JP11 disconnects the UART RX and CTS lines from the RS232 level shifter and allows to
directly accessing the XE1401 UART via JP2.
5.3.7 Protection Diode CR6 Bypass (JP12)
The protection diode CR6 can be bypassed by shorting JP12 to avoid any voltage dropout when using an
application board connected through JP2. If CR6 is bypassed the XE1401SK becomes unprotected against reverse
voltage coming from an external application board.

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5.3.8 Power Supply For XE1401SK (JP13)
The XE1401SK power source can be chosen by JP13. The selected input source is regulated to 3.0V through the
on board voltage regulator U4. It supplies the XE1401, XE3006, radio module as well as the RS232 level shifter
and required glue logic.
JP13 Position Description Imax Regulated
BATTERY 3.2V DC Nominal from batteries regulated to 3.0V through U4 200 mA YES
USB_5V 5V DC from USB port regulated to 3.0V and 3.3V through U4 and U5 200 mA YES
EXT_POWER DC voltage ( 4 – 10 V ) from the external power supply,
regulated to 3.0V through U4 200 mA YES
OPEN No power supply is selected, the XE1401SK is not power supplied - -