STMicroelectronics AN2400 Audio player evaluation board based on st7lite Datasheet

AN2400
Application note
Audio player evaluation board
based on ST7Lite
Introduction
This application note demonstrates how to add audio playback to any application using a
general-purpose ST7 microcontroller. To demonstrate this feature, an evaluation board,
source code in C, schematics, and layout are available.
The Audio player evaluation board reconstructs audio signals through the PWM of a
ST7FLITES2 microcontroller. Serial Flash is used to store the audio data in a binary file
format. To store this audio data in the Flash, the sound files need to be in .wav format so that
can be converted into .bin file format with the help of the PC GUI available with this package.
Once the data is stored, the microcontroller reads it through an SPI interface and generates
the sound using the PWM feature. A sixth order low pass filter removes any unwanted high
frequency components from the signal before passing it through a speaker.
The key features of the Audio player evaluation board are as follows:
■
1% calibrated on-chip RC oscillator. The used microcontroller, ST7FLITES2, contains an
internal RC oscillator with an accuracy of 1% for a given device. It can be calibrated to
obtain a frequency required for the application. There is therefore no need for any external
oscillator.
■
LVD (brown-out) on chip. The purpose of the Low Voltage Detector (LVD) is to ensure that
the ST7 always functions in its safe area. No external reset circuit is required.
■
Small footprint solution.
■
Low power operation. Reduces battery/power supply cost (through extended battery life).
■
Supports lower density serial Flash if fewer messages needed.
■
Order of filter can be reduced to cut cost even more.
November 2006
Rev 1
1/23
www.st.com
Contents
AN2400
Contents
1
Audio player evaluation board overview . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1
2
Instructions for use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Audio player evaluation board concept . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1
Audio recording . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3
Audio reproduction flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4
Filter design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5
WAV file conversion process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
6
Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Appendix A Files description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
A.1
Function description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
A.2
Interrupt routine description: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Appendix B Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Appendix C Bill of materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7
2/23
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
AN2400
1
Audio player evaluation board overview
Audio player evaluation board overview
This evaluation board includes the following main components:
●
8-bit microcontroller: ST7FLITES2. However, the ST7Flite02 can also be used.
●
An external 8 MBit Serial Flash, M25P80 family
●
External components to build a low cost passive filter.
●
An audio amplifier (TDA7233)
●
3.3V low-cost voltage regulator
Figure 1.
Audio player evaluation board block diagram
ST7Lite02
DIP16
Power
Amplifier
Volume
Control
Microcontroller
File Index
6th order
RC filter
Play
Reset
External
Speaker
Connection
SPI
Voltage
Regulator
External
Input
TDA
7233
Serial
Flash
ZIF
Socket
Power
Supply Circuit
Binary LED display
The main features of the evaluation board are as follows:
1.1
●
Plays pre-recorded audio clips stored on an ST 8-Mbit serial Flash
●
Can play up to 15 different audio files
●
Easy to use Index and Play push-buttons
●
Power input 6V DC
●
Phone-quality sound: 8 kHz/8 bit
Instructions for use
Assuming the external Flash is already programmed with sounds, you need to:
1.
Power-on the board
2.
Connect the board to the speaker
3.
Select the desired sound by pressing the Index button. The File Index indicates the
sound to be played with the help of 4 LEDs.
4.
Push the Play Sound button.
5.
Adjust the volume potentiometer to your convenience.
3/23
Audio player evaluation board overview
Figure 2.
AN2400
Labeled diagram of Audio player evaluation board
ICC Connector
External
Speaker Jack
ZIF Socket
for Flash
Power LED
Power Jack
File Index
Switch
4/23
File Index
LEDs
Volume Control
Play Switch
AN2400
Audio player evaluation board concept
2
Audio player evaluation board concept
2.1
Audio recording
A PC is used to prepare audio to be programmed onto the external serial Flash. The file
must contain audio data as well as some basic file management structure to allow the ST7
to pick the correct audio during playback.
The serial Flash is used to store the audio files in binary format. For this purpose, it is
necessary to have the audio files in .wav format which allows them to be converted to a .bin
file to be programmed into the serial Flash.
For conversion to binary, the .wav files should have an 8 kHz sampling frequency and 8-bit
quantization format. These files are input into the provided WAV Converter utility to generate
a single .bin file.
Figure 3.
Sound recording flow
Original Sound
Sampling
Quantifying
Recording process: Can be done on a standard PC, in a recording studio, or just some existing audio samples
WAV
WAV
WAV
Standard
8kHz/8-bit
.WAV files
WAV File Storage
011011011
001010101
BIN
Conversion to Binary File
Burn binary file to M25P
Serial Flash Memory
PC Processing: Convert the .WAV files into a propriety binary file used to reprogram the onboard serial Flash
Once this process is completed, the board is ready to play customized sounds provided by
the user.
A sound is selected using the Index push-button, and then heard by pressing the Play
button.
5/23
Audio reproduction flow
3
AN2400
Audio reproduction flow
Figure 4.
Audio reproduction flow
Train of Pulses PWM
timer feature
MCU reads data from
Serial Flash through SPI
6th Order RC Low-Pass
Filter
Micro Data Processing: Complete source code free available from ST
Analog Filtering
Filter quality/cost tradeoff can be achieved by
populating or not the filter capacitors
Reconstructed signal
to Speaker
Reproduction of “phone
quality” audio
Data, which is stored in the serial Flash, is read by the microcontroller through the SPI
interface. This data is then fed through the timer registers to generate a PWM output whose
duty cycle varies according to the data value.
The sequential path of the data flow from the serial Flash to the speaker is shown in
Figure 5.
Figure 5.
Flow of data from external serial flash to external speaker
1 MHz. RC OSC
+
PLL x 4 or x 8
Internal
CLOCK
PWM Timer Feature
LITE TIMER
External
Serial Flash
VDD
VSS
RESET
LVD/AVD
w/ WATCHDOG
POWER
SUPPLY
PORT A
CONTROL
8-BIT CORE
ALU
SPI Data
Transfer
FLASH
MEMORY
(1 or 1.5K Bytes)
PORT B
PB4:0
(5 bits)
8-BIT ADC
ADDRESS AND DATA BUS
SPI
6/23
12-BIT AUTORELOAD TIMER
RAM
(128 Bytes)
DATA EEPROM
(128 Bytes)
PA7:0
(8 bits)
External
Filter/Speaker
AN2400
Audio reproduction flow
The microcontroller initiates the communication when it selects the Flash and starts reading
the data on a full duplex, synchronous basis. Once the microcontroller reads the data, it
generates a train of pulses using the PWM feature of the 12-bit auto reload timer. This is
explained with the help of an example:
Audio samples of 8 kHz, 8-bit format are to be reproduced. This data is coded in an 8bit format (with values from 0 to 255).
To reproduce the audio with sampling rate of 8 kHz, the microcontroller outputs each
value in every 1/8000 sec (every 125 µs). This means that the period of the PWM is set
at 125µs.
If the coded value of the audio signal is “1”, the microcontroller needs to generate the
PWM signal with a HIGH output for 1 count and LOW for the rest of the 255 counts.
This is shown in the figure below:
Figure 6.
Waveform depicting the microcontroller output
1
x
1
255
Data value of 1 is read from Flash and ART generates
a PWM pulse with a duty cycle high of length 1
with 255 low.
(256 - x)
Data value of x is read from Flash and ART generates
a PWM pulse with a duty cycle high of length x
and (256-x) low.
BIN
Flash
x
Varying duty cycles
256
256
256
256
Figure 7 below shows how the duty cycle register generates this output.
This process uses a duty cycle register, a 12-bit auto reload register and an up-counter.
When an up-counter overflow occurs (OVF event), the ATR value is loaded into the upcounter, the preloaded duty cycle is transferred to the duty cycle register. The PWM0 signal
is then set to a high level. Finally, when the upcounter matches the DCRx value, the PWM0
signal is set to a low level.
To use this sequence for audio generation, the following steps are taken:
1.
When the up-counter reaches 0xFFF, an overflow event occurs. At this point, the PWM
output becomes high.
2.
The ATR register value is loaded into the up-counter which in this example is 0xF00.
0xF00 is selected to maintain a range of 0-FF i.e. 0xF00-0xFFF for an 8-bit resolution
.wav file.
3.
The DCR lower 8-bit register (DCR0L) is loaded with a value that the microcontroller
has read from the serial Flash. The DCR0H register value remains 0x0F. In this
7/23
Audio reproduction flow
AN2400
example therefore, the microcontroller reads “1”. The complete contents of the duty
cycle register is 0xF01.
Note:
4.
The PWM output remains high until the point at which the up-counter contents do not
match the DCR register contents which corresponds to the value from the serial Flash.
5.
As the up-counter value matches the DCR register value, the PWM output goes low
and remains low until the next overflow, i.e. until 0xFFF.
To obtain a PWM signal, the DCR register value should be greater than the up counter
starting value.
Figure 7.
PWM function
The resultant output signal of the microcontroller has a duty cycle corresponding to the 8-bit
of quantization and 8kHz sampling frequency. So following that, the timer frequency will be
8 kHz * 256 = 2 MHz.
This means that 2MHz is the minimum PWM frequency needed for use of the PWM for
audio generation. With the ST7Lite device, the timer can receive Fcpu=8MHz. To utilize the
8MHz timer frequency, the firmware puts 4 times the sample value on the PWM.
The 8 kHz sampling frequency has a very high pitch and is audible to the human ear, so the
signal needs to be reconstructed, passing it through a 6th-order low pass filter. This
removes any unwanted high frequency component from the signal. The signal is then
passed to the amplifier and through to the speaker. The filter cut-off frequency is set to 8
kHz. If it is necessary to change the sampling frequency of the audio to be played, the cutoff frequency of the filter needs to be adjusted according to signal frequency range. The
human ear can detect sounds between 20Hz to 20kHz. However, a range of 4 kHz to 8kHz
is suitable for human voice, hence the 8 kHz is the minimum required sampling frequency.
The microcontroller runs on the internal RC oscillator. It is important to carefully calibrate the
internal RC frequency, as any discrepancy in fCPU value has a huge impact on the audio
reproduction.
8/23
AN2400
4
Filter design
Filter design
Here, a 6th-order low pass filter is used. A low pass filter passes all the signals below the
cutoff frequency and attenuates the signal above cutoff frequency. The reason behind using
a sixth order filter is to have a steeper slope and therefore a better frequency response. It is
created by cascading six first-order low pass filters as shown in figure below:
Figure 8.
Sixth order low pass RC-filter
R
R
R
R
R
R
Vin
Vout
C
C
C
C
C
C
Calculating resistance of low pass filter:
The value of C is taken as 0.01 µf and the cutoff frequency fC is 8kHz.
Cutoff frequency:
fC = 1 / (2 π RC)
so:
R = 1 / (2 π C fC)
= 1 / (2 π (.01 µF) (8 kHz) )
= 1990 Ω
R = 1.9 kΩ
1.9 kΩ is not a standard value, so 1.8 kΩ is used.
9/23
WAV file conversion process
5
AN2400
WAV file conversion process
(Utility provided to convert .wav -> .bin)
The key point of this demonstration board is to be able to customize it to play a set of sounds
defined by the user. The user input to perform this operation will be the user .wav files. The
.wav format is part of the RIFF bitstream format. This is one of the most current of audio
formats for uncompressed PCM (Pulse Code Modulation) audio data as well as for
computer audio storage. As it is required to be able to play multiple sounds in this demo, all
audio data needs to be together in a file that can be programmed in the serial Flash. This is
the purpose of the ARF utility.
The utility generates a .bin file such that:
●
It can be used to flash the content of the M25P serial Flash chip
●
It is in optimized format for the ST7FLiteS2 MCU to read and playback
●
It can contain up to 15 separate sounds that can be accessed individually
●
1 sec of audio uses 64 KB of Flash.
(With its 8 MB Flash, this board can playback up to 2 min of audio)
The folder where you have stored the utility should look similar to the following:
Figure 9.
Note:
Files used to create a .bin file from a .wav file
1.
Copy all .wav files into the same folder. (only 8 kHz/8-bit Files).
2.
Copy romgen.bat and arf.exe into the same folder.
3.
Edit clips.ini with names of sound clips, ensure that there are NO SPACES in the
filenames.
4.
Run romgen.bat.
5.
Program the Serial Flash with the romfile.bin file.
1
A semicolon in front of a line in the INI file creates a comment line which is not processed by
the ARF ROM generator utility.
2
The ARF utility program supports from 1 to 15 audio files, with a total file size supported up
to the storage capacity of the 8-Mbit ST M25P80 Serial Flash ROM chip.
This process generates the romfile.bin file in the same folder with the following structure (as
shown in Table 1). The microcontroller correctly interprets this structure while accessing the
audio samples.
10/23
AN2400
WAV file conversion process
Table 1.
Storage of data in the flash
Offsets
00000000
Description
Gives the number of audio files stored in the serial flash. 1st
Byte contains the value 1-15. Next 3 bytes are unused.
00000004-00000007
Gives the first record size (LSB first)
00000008-0000000B
Gives the first record start address (LSB first)
0000000C-0000000F
Gives the second record size (LSB first)
00000010-00000013
Gives the second record start address (LSB first)
11/23
Conclusion
6
AN2400
Conclusion
This solution provides an easy way to generate audio using an ST7 microcontroller. This can
be customized to fit wide application requirements in term of audio. The solution provided
can also be easily adapted to target a different microcontroller from the same family, or while
using a different timer a wider range of platform options (ST7, STR7…).
12/23
AN2400
Files description
Appendix A
Files description
Table 2.
Files and their description
Files
Main.c
interrupt_vector.c
Description
Contains the parameters, constants (#define), macros, global variables,
function prototypes and their definition.
Contains the basic interrupt vector tables for ST7 devices and the
preprocessors.
interrupt_routines.c
Contains the interrupt service routines and preprocessors.
interface.h
Contains the external declaration for the global variables.
interrupt_routines.h
define.h
Contains the external declaration for the interrupt service routines.
Contains the preprocessors and constants.
io7flite0.h
Contains IO definitions for the various registers of ST7FLITES2
lib_bits.h
Contains the constants (#define) and the public macros and declarations.
bitdef.h
Contains the constants (#define) for the various registers of ST7FLITES2.
A.1
Function description
A.1.1
RC_calibration()
A.1.2
Input Parameter
None
Output Parameter
None
Global Variables
None
Dependencies
None
Description
Used for the RC oscillator frequency adjustment. An 8-bit RC control
register is used for the adjustment.
IO_Init()
Input Parameter
None
Output Parameter
None
Global Variables
None
Dependencies
None
Description
Used to configure the data direction register and option register in
output mode and in push pull mode respectively.
13/23
Files description
A.1.3
A.1.4
A.1.5
A.1.6
14/23
AN2400
SPI_Init()
Input Parameter
None
Output Parameter
None
Global Variables
None
Dependencies
None
Description
1) Configures the SPICSR and SPICR register.
2) Enables the microcontroller in master mode.
PWM_Init()
Input Parameter
None
Output Parameter
None
Global Variables
None
Dependencies
None
Description
Enables the overflow, input capture and compare interrupts.
PWM channel 0 is also enabled.
LiteTimer_Init()
Input Parameter
None
Output Parameter
None
Global Variables
None
Dependencies
None
Description
Enables the timebase interrupt as soon as the counter overflow occurs.
Thereby, time base flag is set by hardware.
GlobalVar_Init()
Input Parameter
None
Output Parameter
None
Global Variables
1) max_file_index
2) file_index
3) IButton_flag
4) PButton_flag
5) tcnt
AN2400
A.1.7
A.1.8
A.1.9
A.1.10
Files description
Dependencies
None
Description
1) Determines the maximum file index.
2) Determines the current file index to be played.
3) Gives the distinction between an index button and a play button.
4) Sets a timer counter for blinking of all the LEDs when the soundboard
is switched on.
LED_Display()
Input Parameter
None
Output Parameter
None
Global Variables
None
Dependencies
None
Description
Switches ON the LEDs in a binary format
Read_1_Byte()
Input Parameter
None
Output Parameter
None
Global Variables
fbuff [index]
Dependencies
None
Description
Reads the first byte of the flash, thereby establishing a communication
path between microcontroller and flash device through SPI interfacing.
Check_Indexbutton()
Input Parameter
None
Output Parameter
None
Global Variables
IButton_flag
Dependencies
1) Key_Debounce()
2) SetNew_Index()
3) LED_Display()
Description
Checks whether the index button has been pressed or not. If pressed
then switching over to next index file is done and thereby LED display
also changes.
Check_Playbutton()
Input Parameter
None
Output Parameter
None
Global Variables
15/23
Files description
A.1.11
A.1.12
A.1.13
A.1.14
16/23
AN2400
Dependencies
Key_Debounce()
Get_Current_Pointers ()
Description
Checks which file is to be played.
Key_Debounce()
Input Parameter
None
Output Parameter
None
Global Variables
tcnt
Dependencies
None
Description
Time delay for debouncing of switch
SetNew_Index()
Input Parameter
None
Output Parameter
None
Global Variables
1) IButton_flag
2) file_index
3) max_file_index
Dependencies
None
Description
Ensures that the index files do not exceed the required limit.
Get_Current_Pointers()
Input Parameter
None
Output Parameter
None
Global Variables
None
Dependencies
None
Description
It works in the following way :
1) selects the flash
2) reads the data from it
3) sends the data to microcontroller from the flash
4) reads and finds the start address of the data
Playbyte()
Input Parameter
None
Output Parameter
None
Global Variables
1) pwmrdy
2) pwm_val
AN2400
Files description
Dependencies
Key_Debounce()
Description
Plays the index files by reading the data from the flash through SPI
interface.
A.2
Interrupt routine description:
A.2.1
LTIC_ISR (Lite timer compare interrupt service routine)
A.2.2
A.2.3
Input Parameter
None
Output Parameter
None
Global Variables
Tcnt
Dependencies
none
Description
Decrements the counter from xx to 00. After decrementing, it clears
the interrupt by reading the LTCSR register.
TO_ISR (Timer overflow interrupt service routine)
Input Parameter
None
Output Parameter
None
Global Variables
1) pwmrdy
2) pwm_val
Dependencies
none
Description
Whenever this interrupt occurs, the variable pwmrdy is incremented,
and the PWM value is loaded in the duty cycle register.
TC_ISR
Input Parameter
None
Output Parameter
None
Global Variables
None
Dependencies
None
Description
Clears the interrupt generated by the PWM0 signal.
17/23
Schematics
AN2400
Appendix B
Schematics
Figure 10. Schematic 1of 2
18/23
Schematics
AN2400
Figure 11. Schematic 2 of 2
APW M
APWM SHOULD BE
ROUTED WITHIN A
GROUND GUARD OR
POURED GROUND
PLANE
5
1
2
C11
0.01 UF 50V 10% CERAMIC
AVX 08055C103KAT2A
2
C13
0.01 UF 50V 10% CERAMIC
AVX 08055C103KAT2A
1
8
7
6
5
RP2
RES ARRAY 1.8K
CTS 743C083182JTR
1
2
3
4
RP3
RES ARRAY 1.8K
CTS 743C083182JTR
8
7
6
5
1
1
4
C8
0.01 UF 50V 10% CERAMIC
AVX 08055C103KAT2A
2
C12
0.01 UF 50V 10% CERAMIC
AVX 08055C103KAT2A
2
2
1
1
C14
0.01 UF 50V 10% CERAMIC
AVX 08055C103KAT2A
2
3
C5
0.022 UF 50V CERAMIC
AVX
08055G223ZAT2A
+IN
-IN
MUTE
3P3V
2
5
C6
220 UF 10V
PANASONIC
ECE-V1AA221P
OUT
2
1
C7 0.1 UF 50V CERAMIC
KEMET
C0805C104Z5UACTU
2
C19
0.1 UF 50V CERAMIC
KEMET
C0805C104Z5UACTU
R11 4.7
YAEGO
RC0805JR-074R7L
Document Number
W ednesday, June 28, 2006
Sheet
1
1
2
3
1
of
5
Rev
J7 SPEAKER JACK
CUI INC MJ-2506N
CP-2506N-ND
EXTERNAL
SPEAKER
3
Voice Annunciation Evalution Board
Date:
Size
Title
220 UF 10V
PANASONIC
ECE-V1AA221P
C9
1
2
1
2
3
4
C16
0.01 UF 50V 10% CERAMIC
AVX 08055C103KAT2A
8
7
2
1
2
U4
AUDIO AMP
ST TDA7233D
2
1
2
2
C18 0.1 UF 50V CERAMIC
KEMET
C0805C104Z5UACTU
1
C10
100 UF 6.3V CERAMIC
NICHICON
UW X0J101MCL1GB
4
C15
0.01 UF 50V 10% CERAMIC
AVX 08055C103KAT2A
1
2
1
2
C17
0.01 UF 50V 10% CERAMIC
AVX 08055C103KAT2A
R9 10K POT
PANASONIC
EVU-F2AF30D14
R8 10K
YAEGO
9C08052A1002FKHFT
3
1
V+
GND2
3
LOW-COST
LOW-PASS FILTER
NOTE:
DEFAULT CONFIGURATION
6TH ORDER FILTER
C16 THROUGH C17
NOT INSTALLED
4
2
D
C
B
A
5
1
6
SVR
GND
1
1
2
1
2
2
3
1
D
C
B
A
19/23
Bill of materials
Appendix C
Table 3.
Index
AN2400
Bill of materials
Bill of materials for Audio player evaluation board
Quantity
Reference
Value /
Generic Part
Number
Package
Manufacturer
Manufacturer
ordering
code/
Orderable
Part Number
1
6
C1, C3, C4, C7,
C18, C19
0.1 UF 50V
CERAMIC
SMD0805
KEMET
C0805C104Z5
UACTU
2
1
C2
10 UF CER
25V
1206
PANASONIC
ECJ3YB1E106M
3
1
C5
0.022 UF 50V
CERAMIC
SMD0805
AVX
08055G223ZA
T2A
4
2
C9,C6
220 UF 10V
8 * 6.2 mm
PANASONIC
ECEV1AA221P
5
8
C8, C11, C12, C13, 0.01 UF 50V
C14, C15, C16,
10%
CERAMIC
C17
SMD0805
AVX
08055C103KA
T2A
6
1
C10
100 UF 6.3V
CERAMIC
6.3 *5.4 mm
NICHICON
UWX0J101MC
L1GB
7
1
D1
DIODESTP
SMA
ST
STPS140A
CUI
PJ-102B
8
1
J1
POWER
POWER JACK JACK2.5MM
14.17 * 8.96
mm
9
1
J2
NOT
INSTALLED
NOT
INSTALLED
MOLEX
22-28-4024
10
2
J5, J3
2 PIN HDR
2 PIN HDR
MOLEX
22-28-4024
11
1
J4
HEADER 2X5
HEADER 2X5
MOLEX
10-89-1101
12
1
J6
HEADER 1X6
HEADER 1X6
MOLEX
22-28-4064
13
1
J7
SPEAKER
JACK
SPEAKER
JACK
CUI INC
MJ-2506N
14
5
LED1, LED2,
GREEN LED
LED3, LED4, LED5
SMD0805
LITEON
LTSTC170GKT
15
1
RP1
RES ARRAY
220
0805
CTS
743C083221J
16
2
RP2, RP3
RES ARRAY
1.8K
0805
CTS
743C083182J
TR
17
6
R1, R2, R3, R4, R5,
10K
R8
SMD0805
YAEGO
9C08052A100
2FKHFT
18
2
R6, R7
SMD
PANASONIC
ERJ6GEYJ104V
20/23
100K
AN2400
Index
Bill of materials
Quantity
Reference
Value /
Generic Part
Number
Package
Manufacturer
Manufacturer
ordering
code/
Orderable
Part Number
19
1
R9
10K POT
11.48 * 9.71
mm
PANASONIC
EVUF2AF30D14
20
1
R10
220E
SMD0805
YAEGO
RC0805JR07220RL
21
1
R11
4.7E
SMD0805
YAEGO
RC0805JR074R7L
22
2
SW1, SW2
PUSH
BUTTON
SPST
4.7X3.5X2.1
mm
PANASONIC
EVQ-P2K02Q
23
1
U1
3.3 VREG
DPAK
ST
KF33BDT
24
1
U2
MCU
DIP16
ST
ST7FLITES2Y
0B6
25
1
U3
WIDE ZIF
SOCKET
SO8
EMULATION
TECHNOLOGY
S-SOP-00008-B
26
1
U4
AUDIO AMP
SO8
ST
TDA7233D
27
1
U5
8-MBIT
FLASH
SO8W
ST
M25P80VMW6G
21/23
Revision history
7
AN2400
Revision history
Table 4.
22/23
Document revision history
Date
Revision
10-Nov-2006
1
Changes
Initial release.
AN2400
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