TABLE OF CONTENTS
1 ................................................................................................................................................... 5 Introduction
2
............................................................................................................................................ 6 Physical outlook
3
................................................................................................................................................... 7 Schematics
4
.................................................................................................................................................... 10 Assembly
5
......................................................................................................................................................... 11 Layout
6
.................................................................................................................................................... 12 Interfaces
6.1
............................................................................................................. 12 Powering the evaluation board
6.2
.................................................................................................................................................... 12 UART
6.3
..................................................................................................................... 12 Host selection DIP switch
6.3.1
.............................................................................................................. 12 UART protocol selection
6.3.2
.......................................................................................................... 13 UART baudrate negotation
6.3.3
.................................................................................................................... 13 Loading the PS keys
6.4
......................................................................................................................................... 14 SPI interface
6.5
........................................................................................................................ 14 SDIO and PIO interface
6.6
.......................................................................................................... 14 PCM Codec and Audio Interface
7
..................................................................................................................................... 15 WEEE Compliance
8
.................................................................................................................................... 16 Contact Information
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1 Introduction
FEATURES
Evaluation kit for WT32 Bluetooth audio module containing
o RS-232 serial interface (230400bps)
o USB interface for power supply
o SPI for upgrading the firmware and parameters
o Reset button
o PCM codec (OKI MSM7702-01)
o 2 x 3,5mm audio jacks for line in and line out
o 24 pin I/O interface (PIO1 – PIO9, UART, SDIO, PCM, GND, 3V3, ENA)
o DIP switches for host interface configuration
o Current measurement point
Host controller interface
TARGET APPLICATIONS
WT21 Evaluation Kit is meant for evaluation and development of WT21 Bluetooth module or prototyping and
piloting Bluetooth systems utilizing WT21 module.
ELECTRICAL FUNCTIONALITY
Please, refer to the latest WT21 data sheet for information about WT21 Bluetooth module. The physical
outlook, schematics, assembly and the PIN configurations of the interfaces of WT21 evaluation Kit are
described in this document.
SOFTWARE FUNCTIONALITY
WT32 evaluation kit is delivered with Host Controller Interface (HCI) firmware, so WT21 only implements the
lowest levels of Bluetooth stack. WT21 always requires a host system that implements the upper layers of
Bluetooth stack and at least one Bluetooth profile.
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echnologies Oy
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2 Physical outlook
Figure 1: WT21 front view
Figure 2: WT21 back view

EBWT21

Mfr. #:
Manufacturer:
Silicon Labs
Description:
EVAL BOARD WT21
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

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