Hardware Overview; Block Diagram; Communication And Signal Mapping To Host Interfaces - Silicon Laboratories BRD8045A User Manual

3. Hardware Overview

The following section provides an overview of the Adapter Board hardware. While power architecture and device interface, i.e. the inter-
face toward the Co-Processor Radio Boards are common to all three BRD8045x variants, the host interface differs, based on the type
of host board related to the specific part number. See table in section
iants and part numbers. From a high level perspective, all host interfaces feature a high speed communication port, either SPI or SDIO,
to exchange wireless data packages, remote reset, and a specific set of signals, depending on the characteristic of the host board inter-
face. Connector pinout details are treated in a dedicate chapter

3.1 Block Diagram

An overview of the Adapter Board is shown in the figure below. The common features are represented in blue blocks, while the different
interfaces, mutually exclusive, are represented in grey blocks. SPI/SDIO lines are represented in blue, UART lines in white, while host
and device power domains with black lines and board power with grey lines.
Linux Host
SDIO
SMMC

3.2 Communication and Signal Mapping to Host Interfaces

The BRD8045x Adapter Board exposes the device's various communication ports on the host interfaces. While asynchronous commu-
nication lines and other single end signals are physically routed to more than one interface on the printed circuit board, when used with
a SiWx917 Wi-Fi Co-processors, the SPI/SDIO signals from the Co-processor are routed through a resistor matrix, determining the fur-
ther path to a specific host interface. This user guide illustrates how the different variants are configured as they come from the factory.
Still, it is possible to solder or desolder components to change the original configuration to customize connectivity. Users who intend to
modify the hardware for other use case scenarios than these that are supported by the orderable kits can find schematic and assembly
drawings at silabs.com.
Here is an overview of the signal routed to the host interface, by product variant:
BRD8045A
SPI/SDIO
UART
-
Low Power Hand Shake
Reset
-
Packet Trafic Arbitration (PTA)
The BRD8045B Adapter Board for Raspberry Pi also supports SPI communication with Silicon Labs Multiprotocol Systems on Chip of
the EFR32 device family.
silabs.com | Building a more connected world.
Arrow.com.
Downloaded from
USB Type-C
Connector
Host Board
SDIO
RPi HAT
Raspberry Pi
Host Board
SPI/ SDIO
Shield
STM32
Host Board
SPI
WSTK/ WPK
EXP
Header
EXP-to-SDCard
Adapter Board
SDIO
BRD8046A
Figure 3.1. Kit Block Diagram
Table 3.1. Overview of Host Connectivity
BRD8045B
SDIO
UART
2
I C
Low Power Hand Shake
Reset
In System Programming (ISP) control
-
UG569: Adapter Board for Co-Processor Radio Boards User's Guide
1.1 Ordering Information
4. Connectors.
USB-UART
UART
BRIDGE
Switch
5V Automatic
Voltage Selector
5V POWER
Hi-Z Input
Voltage Buffer
HOST IO VDD
HG/LG
Power Mode
Current Sense
Analog Outputs
SDIO/SPI
Selection
Resistor Matrix
Hardware Overview
to learn more about the available var-
UART
VMCU Radio Board
Interface
Switch
SDIO/SPI
BRD8045x Adapter Board
BRD8045C
SPI
UART
2
I C
Low Power Hand Shake
Reset
In System Programming (ISP) control
-
Co-processor
Radio Board
Rev. 1.0 | 8