Infineon UltraHub User manual

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Infineon UltraHub
User manual
About this document
Scope and purpose
This user manual provides information about using and evaluating the Infineon analog and digital XENSIV™
MEMS ultrasonic transceivers with the help of the UltraHub evaluation kit. This user manual familiarizes you
with the UltraHub evaluation board and guides you through the initial hardware and software setup and
measurements. Detailed information about access to serial interface and protocol definitions are included.
Intended audience
Design, verification, test and software engineers can use this document to gain an understanding of the
functionality and connections of the UltraHub evaluation kit.

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Infineon UltraHub
User manual
Table of contents
About this document....................................................................................................................... 1
Table of contents............................................................................................................................ 2
1Introduction .......................................................................................................................... 3
1.1 Prerequisites............................................................................................................................................3
1.1.1 Hardware............................................................................................................................................3
1.1.2 Software .............................................................................................................................................3
2Features................................................................................................................................ 4
2.1 Summary of features...............................................................................................................................4
2.2 Block diagram..........................................................................................................................................4
2.3 Initial setup..............................................................................................................................................5
2.1 USB communication ...............................................................................................................................5
2.2 Evaluation board connectors .................................................................................................................6
2.3 Host computer setup ..............................................................................................................................8
2.4 Audacity software setup .........................................................................................................................9
3Ultrasonic transmission configuration.....................................................................................11
3.1 Enabling ultrasonic transmission.........................................................................................................11
3.2 Transmitting burst design.....................................................................................................................11
3.3 Actuation modes ...................................................................................................................................12
4Serial interface .....................................................................................................................14
4.1 Serial configuration...............................................................................................................................14
4.1.1 Device manager................................................................................................................................14
4.1.2 Serial command protocol................................................................................................................14
4.2 API description ......................................................................................................................................15
4.2.1 Sending commands using HTerm ...................................................................................................16
4.2.1.1 Setting actuation start frequency via HTerm.............................................................................16
4.2.1.1 Setting active transceivers via HTerm........................................................................................18
5Guide for firmware update .....................................................................................................20
6Resonance measurements .....................................................................................................22
Revision history.............................................................................................................................24

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Infineon UltraHub
User manual
1Introduction
This document serves as a manual for evaluating up to four Infineon XENSIV™ MEMS ultrasonic transceivers
using the UltraHub evaluation kit. The evaluation board provides an USB audio interface to stream audio data
from ultrasonic transceivers with audio recording and editing software.
1.1 Prerequisites
1.1.1 Hardware
•Infineon UltraHub motherboard
•Infineon XENSIV™MEMS ultrasonic sensing shield
•Micro USB cable
1.1.2 Software
•Audio editing software that supports 192 kHz and 24-bit recording
•FT9xx programming utility for firmware update (optional)

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2Features
2.1 Summary of features
•Micro USB-powered device
•Audio and ultrasonic data streaming over USB interface (USB audio 2.0)
•192 kHz sampling rate
•24-bit four-channel audio data
•Mode switch for DFU mode
•LED indicators for each of the four ultrasonic transceivers on the sensing shield
•Serial interface to read software ID
•Serial interface to send and receive configuration parameters
•EEPROM for storing transceiver, board ID and user configuration settings
2.2 Block diagram
The UltraHub system is the evaluation platform for Infineon XENSIV™ MEMS-based ultrasonic transceivers. It
consists of two parts:
•UltraHub motherboard with microcontroller and audio codec
•UltraHub sensing shield, i.e., shields with up to four ultrasonic transceivers (digital or analog)
Figure 1 Top-level schematic of the UltraHub evaluation kit
EN_CLK24
SPIS_x
I2C_ADC
I2C_EXT
Microcontroller
I2S
GPIO
SCLK
LRCLK
SDAI
FT900Q
SPI
I2C1
I2C0
DAC_PREF
GPIO N_RESET
Level
SPIM_x SPI
LRCLK_MC
SDAO
I2C Adress: 0x2F (7bit addr)
OR
P_MIC1 / DATA1
N_MIC1 / CLK1
P_MIC2 / DATA2
N_MIC2 / DATA2
P_MIC4
N_MIC4
ADC
TLV320ADC
SHDNZ
I2S
I2C
P_MIC3
N_MIC3
I2C Adress: 0x4F (7bit addr)
I2CAdress: 0x4C (7bit addr)
ADC
TLV320ADC
SHDNZ
I2S
I2C
D FF LR_DIV2
Q
~Q
CLK
CLR
RC AND
GPIO TDM_CLK
POT
I2C
SDAO_MC
Reset
Button
MODE
Button
BUTTON
GPIO
12 MHz Osc
24.576 Mhz
Audio Clock
EN
VDD
VMIC_CTRL
DAC_OUT
DAC0
DAC1 VMIC
Precision DAC /Precision DAC /
ReferenceBuffer
LT3040
ADC_SHDN
GPIO
ACTIVATE1
ACTIVATE2
ACTIVATE3
ACTIVATE4
GPIO
GPIO
GPIO
GPIO
CLR_DFF
SDAO_MC
SDAI_MC
SCLK_MC
Filter USB_DN
USB_DP
LDO
LDO
LP5912-3.3V
LP5912-3.3V
VDD3V3
AVDD_3V3
VUSB
DN
DP
USB
D_DP
D_DM
Shifter
Level
Shifter
ACT_MIC1
SEND_MIC1
COM
NC
NO
COM
NC
NO
ACTIVATE1
GND
GND
SDAO
SDAO_F
ACT_MIC2
SEND_MIC2
COM
NC
NO
COM
NC
NO
ACTIVATE2
GND
GND
SDAO
SDAO_F
ACT_MIC3
SEND_MIC3
COM
NC
NO
COM
NC
NO
ACTIVATE3
GND
GND
SDAO
SDAO_F
ACT_MIC4
SEND_MIC4
COM
NC
NO
COM
NC
NO
ACTIVATE4
GND
GND
SDAO
SDAO_F
RC
Filter
Ultrasound Analog Microphones
DATA1
CLK1
ACT_MIC1
SEND_MIC1
ACT_MIC2
SEND_MIC2
ACT_MIC3
SEND_MIC3
ACT_MIC4
SEND_MIC4
VMIC
VMIC
VMIC
VMIC
DATA1
CLK1
DATA2
CLK2
DATA2
CLK2
P_MIC1
N_MIC1
ACT_MIC1
SEND_MIC1
P_MIC2
N_MIC2
ACT_MIC2
SEND_MIC2
P_MIC3
N_MIC3
ACT_MIC3
SEND_MIC3
P_MIC4
N_MIC4
ACT_MIC4
SEND_MIC4
VMIC
VMIC
VMIC
VMIC
UltrasoundDigital Microphones
EEPROM
24AA64T
I2C Adress: 0x50 (7bit addr)
MCP4017

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Figure 2 UltraHub motherboard block diagram
Figure 3 UltraHub sensing shield block diagram
2.3 Initial setup
The board is powered by the Micro USB connector. Connect the board via the Micro USB cable to the host PC.
Figure 5 shows how the UltraHub sensing shield connects to the MCU baseboard. The mechanical connectors
have markers X1 and X2, which should coincide with the same marking on the shield (see Figure 4). The
UltraHub sensing shield is equipped with four LEDs, which turn on based on the actuation of the corresponding
transceiver.
2.1 USB communication
The evaluation board is powered through the Micro USB port. Connect the board to the host computer to
stream the audio data from the transceivers. Any audio recording or editing software (e.g., Audacity) can be
used to record and evaluate the microphones.

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Figure 4 Indication markers and board-to-board connection of motherboard and sensing shield
2.2 Evaluation board connectors
The UltraHub evaluation board offers a wide variety of connectors, listed in Table 1.
Table 1 Connector list
Reference designator
Description
X1
Board-to-board connector for sensing shield
X2
Board-to-board connector for sensing shield
X11
Programming connector
USB1
Micro USB connector for power and audio streaming
X3
Side pins connector
X4
Side pins connector

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Figure 5 Schematic (a) and pad layout (b) of the connectors for the sensing shield
Figure 6 Schematic (a) and pad layout (b) of the motherboard side pins

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2.3 Host computer setup
To enable the best performance with USB audio recording, the processor resource allocation should be
adjusted for the best performance of background services. Please follow these steps to enable this in the
Windows 10 operating system:
•Go to Control Panel > System and Security > System > Advanced system settings.
•Go to the “Advanced”tab and click on the “Settings”button under “Performance”.
•In the pop-up window of “Performance Options”, go to the “Advanced”tab, select “Background services”
and apply changes.
Figure 7 Host computer system settings
To enable the UltraHub to be opened in exclusive mode:
•Open “Windows Sounds Settings”.
•Choose UltraHub as input and click on “Device Properties”.
•Click on “Additional Device Properties”.
•In the “Advanced”tab, make sure that the two checkboxes under the “Exclusive Mode”section are set:
1. Allow applications to take exclusive control of this device.
2. Give Exclusive Mode applications priority.

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Figure 8 Exclusive Mode for UltraHub
2.4 Audacity software setup
Audacity is a free and open-source audio editor and recording application. Select the audio source as
“Microphone Array (UltraHubX)” in the recording software, as shown in Figure 9. Select “Windows WASAPI” as
the audio driver and “4” channels. The project rate should be edited to 192000 Hz.

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Figure 9 Recording from UltraHub in Audacity

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3Ultrasonic transmission configuration
3.1 Enabling ultrasonic transmission
The four channels on the sensing shields all record audio signals continuously. The ultrasonic transmitting
functionality can instead be configured depending on which of the four channels is required to transmit the
ultrasonic bursts according to the pulse-echo principle.
Default configuration sees only channel 1 active as transceiver, i.e., sending and receiving, and channels 2, 3
and 4 inactive, i.e., receiving only. Figure 10 illustrates the actuation patterns for the default configuration (A)
as well as custom configuration (B), with all four transceivers active in sending mode.
Figure 10 Examples of actuation signals for default (A) and custom configuration with all channels
active (B)
3.2 Transmitting burst design
The ultrasonic transmitting patterns can be configured using a selection of parameters:
•Start frequency, i.e., frequency at the start of the actuation burst [20 𝑡𝑜 90 𝑘𝐻𝑧]
•End frequency, i.e., frequency at the end of the actuation burst [20 𝑡𝑜 90 𝑘𝐻𝑧]
•Number of pulses, i.e., number of cycles in the actuation burst [1 𝑡𝑜 12 𝑝𝑢𝑙𝑠𝑒𝑠]
•Pulse repetition time (PRT), i.e., the time interval between the start of one pulse and the start of the
next one [3 𝑡𝑜 500 𝑚𝑠]
The effect of the above parameters is illustrated in Figure 12.

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Figure 11 Examples of transmitting bursts varying start, end frequency and number of pulses
Figure 12 Representation of the PRT and actuation bursts
Note: While the PRT can be directly set by the user, the duration of the actuation burst can vary depending on
start, end frequencies and number of pulses. The smaller the actuation frequencies are, the longer the
actuation burst will be. The higher the number of cycles, the longer the actuation burst will be.
3.3 Actuation modes
The ultrasonic transceivers can be actuated according to two modes: parallel or cyclic.
•In parallel mode, the active transceivers (i.e., the transceiver selected as active by the user; by default,
only transceiver number 1 is selected as active) are all actuated synchronously.
•In cyclic mode, the active transceivers (i.e., the transceiver selected as active by the user; by default,
only transceiver number 1 is selected as active) are actuated one after the other. In cyclic mode, each
frame is characterized by only one active transceiver at each pulse repetition time.

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Figure 13 Comparison of parallel (A) and cyclic (B) actuation modes, two transceivers active
Figure 14 Comparison of parallel (A) and cyclic (B) actuation modes, four transceivers active
Note: The cyclic actuation is performed only on the transceivers selected as active. If only one transceiver is
selected as active, no difference will be perceived between the two modes. If all four transceivers are selected
as active, the actuation will cyclically involve all four channels.

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4Serial interface
USB communications device class (USB CDC) is a composite Universal Serial Bus device class. The UltraHub has
both audio source and CDC end points. This allows for sending bytes to the serial interface using any serial
terminal.
Note: Serial commands can be sent to the UltraHub only in idle state, i.e., when the UltraHub is not recording
any audio.
4.1 Serial configuration
Baud:
19200
Parity:
None
Stop bits:
1
Byte size:
8
Timeout:
1
4.1.1 Device manager
The COM port of the connected UltraHub board can be seen in the Device Manager. Its description contains
“USB Serial Device”, as shown in Figure 15.
Figure 15 USB CDC interface description
4.1.2 Serial command protocol
The following protocol was implemented in the firmware to receive commands from the application. The user
can send a message in the following format.
<Command><Specifier><Parameter><Termination>
Command:
1 byte
Specifier:
1 byte
Parameter:
4 bytes (last byte first)
Termination:
1 byte (0x0A)
The size of the return value depends on the type of message, and is defined in the API description.

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4.2 API description
Table 2 summarizes the serial commands to configure the device.
Table 2 System commands
Command
(HEX)
Specifier
(HEX)
Parameter
(lower
limit, int)
Parameter
(higher
limit, int)
Information
Return
0x66
0x6C
20000
90000
Start frequency [Hz] of the ultrasonic
transmitting chirp
Parameter set value.
Length: 4 bytes
0x66
0x68
20000
90000
End frequency [Hz] of the ultrasonic
transmitting chirp
Parameter set value.
Length: 4 bytes
0x64
0x2C
1
12
Number of pulses in the ultrasonic
transmitting chirp
Parameter set value.
Length: 4 bytes
0x77
0x2C
1
500
Pulse repetition time (PRT) [ms]
Parameter set value.
Length: 4 bytes
0x6E
0x6D
0x00
0x00
Returns the number of transceivers
mounted on the board
(read-only)
Parameter read value.
Length: 4 bytes
0x6E
0x2C
0b0000
0b1111
Activate/deactivate ultrasonic
transmission for each transceiver by
bitwise selection of
LSBParameter(3:0),
D0: Transceiver 1
D1: Transceiver 2
D2: Transceiver 3
D3: Transceiver 4
Parameter set value.
Length: 4 bytes
0x43
0x00
0x00
0x00
Read all configuration parameters
(read-only)
Read nine words of size
equal to 4 bytes:
0 –start frequency
1 –end frequency
2 –actuation pulses
3 –pulse repetition time
4 –number of transceivers
5 –active transceivers
6 –null
7 –device ID
8 –actuation mode
0x41
0x00
0x00
0x00
Save current configuration
parameters to EEPROM
0
Length: 4 bytes
0x45
0x45
0x00
0x00
Update stored configuration
parameters from EEPROM
0
Length: 4 bytes
0x68
0x00
0x00
0x00
Restore default configuration
parameters
0
Length: 4 bytes
0x75
0x61
0
1
Set actuation mode:
“0” –parallel actuation (all selected
transceivers in parallel)
“1” –cyclic actuation (one
transceiver is transmitting after
another)
Parameter set value.
Length: 4 bytes
0x50
0x00
0x00
0x00
Get pulse and cycle length in bits
Return 14 integer values
of UltraHub parameters.

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Command
(HEX)
Specifier
(HEX)
Parameter
(lower
limit, int)
Parameter
(higher
limit, int)
Information
Return
Each word is 4 bytes in
size. LSB will be sent first
1. Word: I2S speed =
24576000 Hz
2. Word: pulse repetition
based on I2S clock
speed
3. Word: first frequency
high/low length based
on I2S clock speed
4. Word: second
frequency…
14. Word: 12th frequency
0x49
0x00
0x00
0x00
Get transceiver information as string
of 32 characters
(read-only)
Transceiver’s name e.g.,
“IM70A135UT\n”
0xE9
0x00
0x00
0x00
Get the software version as string
Software ID e.g.,
“IFX-UltraHub: V0.81\n”
4.2.1 Sending commands using HTerm
Any terminal program for serial communication can be used to access the serial port. In the following
examples, HTerm (www.der-hammer.info) is used as terminal program.
4.2.1.1 Setting actuation start frequency via HTerm
To configure the first actuation frequency as 34000 Hz, use the command in Table 3. Figure 16 shows how to set
up the environment and send the desired command via HTerm. Type the values in hexadecimal to send the
command, and click enter. Wait for the received data to appear.
Note: The LSB is transmitted first in parameter.
Table 3 Decimal value of frequency (34000 Hz) in Hex
Command (Hex)
Specifier
(Hex)
Parameter
Terminator
Info
Return
(Decimal)
(Hex)
0x66
0x6C
34000
0x84 D0
0x0A
Start frequency [Hz]
Parameter set value.
Length: 4 bytes
Transmitted bytes: 66 6C D0 84 00 00 0A
Received bytes: D0 84 00 00

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Figure 16 Setting actuation frequency via HTerm
The received bytes (LSB first) from the UltraHub board is the value set in the device. If the user inserts a
parameter that is out of range, the value is set to the corresponding upper or lower limit value for the
parameter, as in the following example.
Figure 17 Sending out-of-limit value to device

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Table 4 Decimal value of frequency (10000 Hz) in Hex
Command (Hex)
Specifier
(Hex)
Parameter
Terminator
Information
Return
(Decimal)
(Hex)
0x66
0x6C
100 000
0x 01 86 A0
0x0A
Start frequency [Hz]
Parameter set value.
Length: 4 bytes
Transmitted bytes: 66 6C A0 86 01 00 0A (sending actuation start frequency = 100 000 (0x 01 86 A0))
Received bytes: 90 5F 01 00 (received value is 90000, which is the highest limit that can be set)
4.2.1.1 Setting active transceivers via HTerm
To configure the first transceiver as active, i.e., able to transmit, use the command in Table 6. Figure 16 shows
how to set up the environment and send the desired command via HTerm. Type the values in hexadecimal to
send the command, and click enter. Wait for the received data to appear.
Note: The LSB is transmitted first in parameter (see Table 5)
Table 5 Set bit corresponding to the transceiver
Transceiver 4
Transceiver 3
Transceiver 2
Transceiver 1
B3
B2
B1
B0
Table 6 Binary value of zero-actuating channels
Command
(Hex)
Specifier
(Hex)
Parameter
Terminator
Information
Return
(Decimal)
(Hex)
0x6E
0x2C
1
0x00
0x0A
Activate/deactivate ultrasonic
transmission
Parameter set value.
Length: 4 bytes
Transmitted bytes: 6E 2C 0x01 00 00 00 0A
Received bytes: 0x01 0x00 0x00 0x00
To configure the first and the third transceivers as active, i.e., able to transmit, send the command via HTerm as
illustrated in Figure 19.
Transmitted bytes: 6E 2C 0x03 00 00 00 0A
Received bytes: 0x03 0x00 0x00 0x00

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Figure 18 Setting transceiver 1 as active transceiver
Figure 19 Setting transceiver 1 and transceiver 2 as active transceivers

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5Guide for firmware update
To update the firmware on the UltraHub evaluation board:
•Press the push-button for three seconds to turn on DFU mode on the microcontroller. An LED next to
the USB connector indicates DFU mode. Check in the Device Manager that DFU mode is enabled.
Figure 20 The microcontroller is in DFU mode from the Device Manager
•Download FT9xx Programming Utility (FT9xx_Toolchain_Setup_2.5.0)
•Select the option “Program via USB (DFU) interface”.
Figure 21 Select the option “Program via USB (DFU) interface”
•Scan and select the device of interest.
Figure 22 Scan and select device
•Select the proper binary file to Flash.