dm00100183

AN4395
Application note
Autonomous wireless multi-sensor node powered by PV cells and
based on SPV1050 (SPIDEr™)
Domenico Ragonese
Introduction
The STEVAL-IDS002V1 is a complete and fully configurable reference design of a wireless
sensor node powered by the energy harvested from a photovoltaic module soldered on the
top. It is composed by a fully integrated transmitter board which contains a temperature
sensor, an air pressure sensor and a 3-axis accelerometer MEMS sensor powered by the
SPV1050 device. Moreover a microcontroller and an RF Sub-Giga transmitter, all by ST, are
mounted on the board.
The system has a receiver companion powered through a USB cable by the PC. For further
details on the SPV1050 device, please refer to the related datasheet.
The reference design kit is supported by a software user-friendly GUI able to show PV
module and battery electrical characteristics, conversion efficiency, MPPT accuracy and
sensors readings.
The transmitter module is based on an STM32L151 low power microcontroller which
controls sensors configuration and data communication. A digital temperature sensor
(STTS751), a pressure sensor (LPS331AP) and a 3-axis accelerometer (LIS3DH) are
connected to the microcontroller through the I2C bus.
Figure 1. STEVAL-IDS002V1 reference design kit (SPIDEr™)
May 2014
DocID025513 Rev 1
1/24
www.st.com
Contents
AN4395
Contents
1
Transmitter board schematics and bill of material . . . . . . . . . . . . . . . . 3
2
Transmitter board layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3
Receiver board schematics and bill of material . . . . . . . . . . . . . . . . . . 12
4
Receiver board layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5
STEVAL-IDS002V1 reference kit description (SPIDEr™) . . . . . . . . . . . 17
5.1
5.2
6
2/24
TX board connectors and jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.1.1
Sensor/transmitting module connectors and jumpers . . . . . . . . . . . . . . 19
5.1.2
Harvesting module connectors and jumpers . . . . . . . . . . . . . . . . . . . . . 20
RX board connectors and jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
DocID025513 Rev 1
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AN4395
Transmitter board schematics and bill of material
Transmitter board schematics and bill of material
Figure 2. Board schematic - transmitter/receiver
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AN4395
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AN4395
Transmitter board schematics and bill of material
Figure 4. Board schematic - microcontroller
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AN4395
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AN4395
Transmitter board schematics and bill of material
Table 1. Transmitter board - bill of material
Item Qty.
Designator
SCI part number
Value
1
1
BT1
BATT-CR2450-3V6
3.6 V
2
9
C1, C2, C3, C7, C13, C15, C33, C42, C43
CCERSMD104-0402M
100 nF
3
1
C4
CCERSMD226-0603V
22 F
4
2
C5, C6
CCERSMD060-0402
6 pF
5
1
C8
6
2
C9, C20
CCERSMD106-0603R
10 F
7
1
C10
CCERSMD105-0603T
1 F
8
1
C11
CCERSMD101-0402M
100 pF
9
3
C12, C16, C28
CCERSMD331-0402
330 pF
10
1
C14
CCERSMD105-0603T
1 F
11
2
C17, Ctun1
DNM
12
2
C18, C23
DNM
13
1
C19
CCERSMD221-0603
220 pF
14
2
C21, C31
CCERSMD221-0402
220 pF
15
1
C22
CCERSMD070-0402
7 pF
16
1
C24
CCERSMD024-0402
2.4 pF
17
1
C25
CCERSMD036-0402
3.6 pF
18
2
C26, C27
CCERSMD180-0402
18 pF
19
1
C29
CCERSMD103-0402M
10 nF
20
1
C30
CCERSMD015-0402
1.5 pF
21
1
C32
CCERSMD020-0402
2 pF
22
2
C34, C35
CCERSMD105-0603T
1 F
23
1
C36
CCERSMD104-0603T
100 nF
24
2
C37, C38
CCERSMD105-0603T
1 F
25
2
C39, C40
CCERSMD476-0805K
47 F
26
1
C41
CCERSMD103-0603R
10 nF
27
1
C44
CCERSMD474-0603P
470 nF
28
1
CN1
USB-MICROB-SMD
USB
29
1
CN2
SAM-TSW10208GSRA
Header 2
30
1
Ctun2
31
4
D1, D2, D3, D4
DBAT41M-SMD
Schottky
32
1
J1
BNC-SMA-9EL-SMD
BNC
33
1
No reference: antenna to be screwed on J1
LPRS - WR868
868 MHz to 915 MHz,
SMA antenna
34
1
J2
STRIP2PM
JUMPER
10 F - DNM
DNM
DocID025513 Rev 1
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24
Transmitter board schematics and bill of material
AN4395
Table 1. Transmitter board - bill of material (continued)
Item Qty.
Designator
SCI part number
Value
35
6
J3, J4, J5, J6, J7, J9
STRIP1X3-M-SMD
ST_19_STRIP3_100M_V_
36
1
J8
SAM-SMH10802GD
Header 8X2
37
1
JP1
SAM-TMM10302GD
STRIP2X3
38
1
L1
INDLQM21FN100M70
10 H
39
1
L2
IND0402CS-27N
27 nH
40
1
L3
INDLQG15HSR10J02
100 nH
41
1
L4
42
1
L5
INDLQG15HN3N6S02
3.6 nH
43
1
L6
INDLQG15HN5N1S02
5.1 nH
44
1
L7
RESMD000-0402
0
45
1
L8
INDLQG15HN18NJ02
18 nH
46
2
L9, L10
INDLQG15HN15NJ02
15 nH
47
1
L11
INDSMD4,7UH82464
Antenna
48
1
L12
IND-LPS4018223ML
22 H
49
1
P1
STRIP40PMD90
STRIP 8 POLI
50
13
R1, R2, R3, R4, R5, R16, R17, R18, R19,
R20, R26, R27, R28
RESMD101-0402
100 
51
2
R6, R7
RESMD100-0402
10 
52
2
R8, R9
RESMD104-0402
100 K
53
4
R10, R11, R12, R13
RESMD103-0402
10 K
54
1
R14
RESMD561-0402
560 
55
1
R15
RESMD000-0402
0
56
2
R21, R29
RESMD754-0603
750 K
57
1
R22
RESMD244-0603
240 K
58
1
R23
RESMD124-0603
120 K
59
1
R24
RESMD104-0603
100 K
60
1
R25
RESMD4223-0603
422 K
61
1
R30
RESMD823-0603
82 K
62
1
R31
RESMD105-0603
1 M
63
1
R32
RESMD125-0603
1.2 M
64
1
R33
RESMD562-0603
5.6 M
65
1
R34
RESMD185-0603
1.8 M
66
2
R35, R38
RESMD305-0603
3 M
67
1
R36
RESMD106-0603
10 M
68
1
R37
RESMD684-0603
680 K
8/24
DNM
DocID025513 Rev 1
AN4395
Transmitter board schematics and bill of material
Table 1. Transmitter board - bill of material (continued)
Item Qty.
Designator
SCI part number
Value
69
1
R39
RESMD5361-603-01
5.36 k
70
1
R40
RESMD2051-0603
2.05 k
71
1
SW1
PULS-B3U1100-SMD
SW-PB
72
4
SW2, SW4, SW6, SW7
STG3220QTR-SMD
STG3220
73
4
SW3, SW5, SW8, SW9
STG5223QTR-SMD
STG5223
74
2
SW10, SW11
RS 712-2558
SW SLIDE-SPST
75
3
TP1, TP3, TP17
TEST2
TEST2
76
2
TP2, TP4
TEST2-R
TEST2
77
12
TP5, TP6, TP7, TP8, TP9, TP10, TP11,
TP12, TP13, TP14, TP15, TP16
78
1
U1
STM32L151-SMD
STM32L151CB5T6
79
1
U2
STTS7510WB3-SMD
STTS751
80
1
U3
LIS3DH-SMD
LIS3DH
81
1
U4
LPS331AP-SMD
LPS331APY
82
1
U5
SPIRIT1QTR-SMD
SPIRIT1
83
1
U6
M24LR64ER-SMD
M24LR64E-R
84
1
U7
STLQ50C-R-SMD
STLQ50
85
1
U8
PTR-SFH5711-SMD
SFH5711
86
1
U9
ST715MR-SMD
ST715MR
87
1
U10
STLQ015XG25R-SMD
STLQ015XX
88
1
U11
KIT-EXT
SPV1050
89
2
U12
PANN-AM-1801
PV PANEL
90
1
U13
BATT-HOLD-2450
BATT-HOLD-2450
91
1
VR1
RTR-3312-2M-SMD
0 - 2 M
92
1
X1
Q4MHZ-SMD-RISZ
4 MHz
93
1
X2
Q32,768-ABS07SMD
XT-2PIN
94
1
XTAL1
Q50MHZ-TXC7M-SMD
50 MHz
95
1
CX1
CCERSMD225-0805X
2.2 F
DNM
DocID025513 Rev 1
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Transmitter board layout
2
AN4395
Transmitter board layout
Figure 6. Transmitter board - top layer view
Figure 7. Transmitter board - inner layer 1 view
10/24
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AN4395
Transmitter board layout
Figure 8. Transmitter board - inner layer 2 view
Figure 9. Transmitter board - bottom layer view
DocID025513 Rev 1
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Receiver board schematics and bill of material
AN4395
Receiver board schematics and bill of material
Figure 10. Receiver board schematic - RF transmitter/receiver
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AN4395
Receiver board schematics and bill of material
Figure 11. Receiver board schematic - microcontroller
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Receiver board schematics and bill of material
AN4395
Table 2. Receiver board - bill of material
Qty.
5
Designator
Part number SCI
C1, C2, C3, C15, C17 CCERSMD104-0402M
Comment
Part description
100 nF
Mult. cer. cap. 16 V SMD 0402
1
C4
CCERSMD226-0603V
22 F
Mult. cer. cap. 6.3 V SMD 0603
2
C5, C6
CCERSMD060-0402
6 pF
Mult. cer. cap. 50 V SMD 0402
1
C7
CCERSMD104-0603V
100 nF
Mult. cer. cap. 50 V SMD 0603
2
C8, C11
N. M.
Mult. cer. cap. 6.3 V SMD 0603
1
C9
CCERSMD105-0603M
1 F
Mult. cer. cap. 25 V SMD 0603
1
C10
CCERSMD475-0603
4.7 F
Mult. cer. cap. 6.3 V SMD 0603
1
C13
CCERSMD101-0402M
100 pF
Mult. cer. cap. 50 V SMD 0402
3
C14, C18, C26
CCERSMD331-0402
330 pF
Mult. cer. cap. 50 V SMD 0402
2
C19, Ctun1
N. C.
Mult. cer. cap. SMD 0402
2
C20, C29
CCERSMD221-0402
220 pF
Mult. cer. cap. 50 V SMD 0402
1
C21
CCERSMD070-0402
7 pF
Mult. cer. cap. 50 V SMD 0402
1
C22
CCERSMD024-0402
2.4 pF
Mult. cer. cap. 50 V SMD 0402
1
C23
CCERSMD036-0402
3.6 pF
Mult. cer. cap. 50 V SMD 0402
2
C24, C25
CCERSMD180-0402
18 pF
Mult. cer. cap. 50 V SMD 0402
1
C27
CCERSMD103-0402M
10 nF
Mult. cer. cap. 50 V SMD 0402
1
C28
CCERSMD015-0402
1.5 pF
Mult. cer. cap. 50 V SMD 0402
1
C30
CCERSMD020-0402
2pF
Mult. cer. cap. 50 V SMD 0402
1
J1
BNC-SMA-9EL-SMD
BNC
Female SMA end launch jack
1
No reference: antenna
to be screwed on J1
LPRS - WR868
Antenna
868 MHz to 915 MHz, SMA antenna
1
J2
STRIP2PM
Jumper
Male strip 2 poles
1
L1
INDLQM21FN100M70
10 H
SMPS out inductor - Murata LQM21 series
1
L2
IND0402CS-27N
27 nH
SMPS out inductor - Coilcraft
1
L3
INDLQG15HSR10J02
100 nH
TX PA choke
1
L4
N. C.
SMD inductor 0402
1
L5
INDLQG15HN3N6S02
3.6 nH
TX LPF 1st series
1
L6
INDLQG15HN5N1S02
5.1 nH
TX LPF 2nd series
1
L7
RESMD000-0402
0
Resistor 1/16 W 1% SMD 0402
1
L8
INDLQG15HN18NJ02
18 nH
TX LPF 2nd series
2
L9, L10
INDLQG15HN15NJ02
15 nH
TX LPF 2nd series
1
P1
M.20.90 LP
20 Flat
20-way flat connector (horizontal)
1
P2
SAMTECUSBB
USB
SAMTEC USB B connector, right angle
2
R2, R3
RESMD100-0402
10 
Resistor 1/16 W 1% SMD 0402
1
R4
RESMD105-0402
1 M
Resistor 1/16 W 1% SMD 0402
14/24
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AN4395
Receiver board schematics and bill of material
Table 2. Receiver board - bill of material (continued)
Qty.
Designator
Part number SCI
Comment
Part description
4
R5, R6, R7, R8
RESMD103-0402
10 K
Resistor 1/16 W 1% SMD 0402
1
R9
RESMD561-0402
560 
Resistor 1/16 W 1% SMD 0402
1
R10
RESMD000-0402
0
Resistor 1/16 W 1% SMD 0402
1
R11
N. M.
Resistor 1/10 W 1% SMD 0603
1
R12
RESMD9761-0603
9.76 K
Resistor 1/10 W 1% SMD 0603
1
R13
RESMD562-0603
5.6 K
Resistor 1/10 W 1% SMD 0603
1
R14
RESMD0R01-0603
0.01 
Resistor 1/10 W 1% SMD 0603
1
SW1
PULS-DTSM61-SMD
Reset
Pushbutton_SMD
2
TP1, TP3
TEST2-R
TEST2
PCB test point - raised loops
2
TP2, TP4
TEST2
TEST2
PCB test point - raised loops
1
U1
STM32L151-SMD
STM32L15
1CB5T6
Microprocessor - SMD LQFP48
1
U2
ST715MR-SMD
ST715MR
High input voltage - 85 mA LDO linear
regulator - SOT23-5L
1
U3
KIT-EXT
SPIRIT1
ST
1
X1
Q4MHZ-SMD-RISZ
4 MHz
4 MHz SMD RESONATOR
1
X2
Q32,768-ABS07SMD
XT-2PIN
QUARTZ ABRACON SMD ABS07
1
XTAL1
Q50MHZ-TXC7M-SMD
50 MHz
QUARTZ 50 MHz SMD TXC 7M series
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Receiver board layout
4
AN4395
Receiver board layout
Figure 12. Receiver board - top layer view
Figure 13. Receiver board - bottom layer view
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5
STEVAL-IDS002V1 reference kit description (SPIDEr™)
STEVAL-IDS002V1 reference kit description
(SPIDEr™)
The STEVAL-IDS002V1 kit includes two different boards:

The TX board integrating both the harvesting module and the sensor/transmitting
module.

The RX board that only receives data and lets them available to the PC GUI.
The harvesting module on the TX board is based on the SPV1050 ULP energy harvester,
battery charger and power manager IC.
Purposes of the harvesting module are extracting the maximum power allowable from the
on-board PV panel, controlling the battery charging and supplying the sensor/transmitting
module.
For an exhaustive description of the SPV1050 device, please refer to the related datasheet.
The power efficiency and MPPT accuracy of the harvesting module can be monitored by
connecting the power monitoring board on J8 and lunching the provided software. Figure 14
shows the transmitter board connected to the power monitoring board.
Figure 14. Power monitoring and STEVAL-IDS002V1
A complete description of the software and GUI is reported in the software user manual
UM1752. Just as an example, Figure 15 shows the efficiency tab of the GUI displaying:

The actual PV panel curve according to the ambient light conditions

The green dot indicating the real working point

The blue dot indicating the maximum power point

The table (on the top right side of the screen) reporting the main system parameters
and performances.
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STEVAL-IDS002V1 reference kit description (SPIDEr™)
AN4395
Figure 15. Efficiency tab example
The sensor/transmitting module on the TX board is a complete autonomous wireless sensor
node, including three different environment sensors based on MEMS technology, a lowpower embedded radio, a dual port Flash memory providing a NFC interface and
a dedicated microcontroller. Main components are:

Sensors
1.Temperature sensor
STM STTS751
2. Pressure sensor
STM LPS331
3. 3-axis accelerometer
STM LIS3DH

Low power radio
STM SPIRIT1

DP memory + NFC interface
STM M24LR64E

Microcontroller
STM STM32L151CB5T6
All devices (except the microcontroller) can be physically disconnected via dedicated power
switches, which are dynamically configured through the software GUI. All other
characteristics of the node are customized by the GUI too, such as the sampling period,
transmission delay, and radio configuration.
Moreover the TX board can be used as an extra harvesting source, thanks to the
M24LR64E DP memory. As a matter of fact the M24LR64E device works as an RF
harvesting module, in the frequency range of NFC communication, so that it is able to
provide (through a dedicated pin) a certain energy amount while it is read / written.
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AN4395
STEVAL-IDS002V1 reference kit description (SPIDEr™)
5.1
TX board connectors and jumpers
5.1.1
Sensor/transmitting module connectors and jumpers
CN1 (6-pin): micro-USB connector
Table 3. CN1 connector
Pin
1
2
3
4
5
6
IN
INOUT
INOUT
INOUT
INOUT
INOUT
VUSB (5 V)
D-
D+
ID
GND
SHIELD
Direction/supply
Signal
CN2 (2-pin): external antenna connector
Use the pin 1 and pin 2 of CN2 to connect an external antenna, alternative to the one onboard (J1).
Set properly JP1 in case an external antenna is connected on CN2.
P1 (8-pin connector): dedicated JTAG connector
Table 4. P1 connector
Pin
1
2
3
4
5
6
7
8
Direction/supply
OUT
OUT
IN
OUT
OUT
OUT
OUT
INOUT
Signal
VDD
TRST
TDI
TMS
TCK
TDO
NRST
GND
Table 5. JP1 connector
JP1
Function
CLOSE: 3 - 5 and 4 - 6 to use the on-board antenna
CLOSE: 1 - 3 and 2 - 4 to use external antenna on CN2
Table 6. J2 jumper
J2
Function
CLOSE: sensor/transmitting module supplied by the harvesting module
OPEN: sensor/transmitting module supplied by external USB (for test functions)
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STEVAL-IDS002V1 reference kit description (SPIDEr™)
5.1.2
AN4395
Harvesting module connectors and jumpers
Table 7. J3 jumper
J3
Function
CLOSE2 - 3: STORE pin supplied by the USB cable
OPEN 1 - 2: STORE pin supplied by the energy harvesting source.
Table 8. J4 jumper
J4
Function
CLOSE 1 - 2: not used
OPEN 1 - 2: enables ambient light sensing from the monitoring board
Table 9. J5 jumper
J5
Function
CLOSE1 - 2: bypasses power monitoring sense and supplies directly the SPV1050
OPEN 1 - 2: enables input sensing from the power monitoring board
Table 10. J6 jumper
Function
CLOSE 1 - 2: bypasses power monitoring sense and connects the battery to the BATT
pin
OPEN 1 - 2: enables output sensing from the power monitoring board
Table 11. J7 jumper
J7
Function
CLOSE 2 - 3: harvesting board supplied by the on-board PV panel
OPEN: enables alternative source from J9
J9 (2-pin connector)
This connector is provided to supply the SPV1050 device by supply source alternative to the
on-board PV panel. In case a supply source is connected to J9, then J7 must be open.
Table 12. J9 connector
Pin
Direction/supply
Signal
20/24
1
2
SUPPLY
SUPPLY
SOURCE +
SOURCE -
DocID025513 Rev 1
AN4395
STEVAL-IDS002V1 reference kit description (SPIDEr™)
J8 (16-pin monitoring connector)
It provides the connection to the power monitoring board.
Table 13. J8 connector
Pin
1-2
3-4
5-6
7-8
9 - 10
11 - 12
13 - 14
15 - 16
Direction/supply
OUT
OUT
OUT
OUT
SUPPLY
OUT
OUT
SUPPLY
SOURCE
PV+
Vbatt+
VBATT_
OUT
SUPPLY_
SFH5711
Signal
AMBIENT_ AMBIENT
LIGHT_PIN _LIGHT
GND

SOURCE, PV+:
Harvesting source current sensing pins.
If the power monitoring board is used, then the jumper J5 must be left open; otherwise
(power monitoring board not used) pins 1 - 2 of J5 must be shorted.

VBATT+, VBATT_OUT:
Battery current sensing pins.
If the power monitoring board is used, then the jumper J6 must be left open; otherwise
(power monitoring board not used) pins 1 - 2 of J6 must be shorted.

SUPPLY_SFH5711:
Power supply of the ambient light sensor pin (placed on the top side of the board).
The ambient light sensor is supplied and used only when the power monitoring board is
connected.

AMBIENT_LIGHT, AMBIENT_LIGHT_PIN:
Ambient light current sensing pins.
If the power monitoring board is used, then the jumper J7 must be left open.

GND: Ground pin.
Table 14. SW1 - SW2
SW1
CLOSE 1 - 3: LDO1 DISABLED
SW2
CLOSE 1 - 3:
LDO2 DISABLED (sensor/transmitter module not supplied)
Function
CLOSE 2 - 3: LDO1 ENABLED
CLOSE 2 - 3:
LDO2 ENABLED (sensor/transmitter module supplied)
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STEVAL-IDS002V1 reference kit description (SPIDEr™)
5.2
AN4395
RX board connectors and jumpers
P1 (20-pin connector): standard JTAG connector
Table 15. P1- part 1
Pin
1-2
3
5
7
9
11
13
15
Direction
OUT
OUT
IN
OUT
OUT
INOUT
OUT
OUT
Signal
VDD
TRST
TDI
TMS
TCK
PD
TDO
NRST
Table 16. P1 - part 2
Pin
17 - 19
2 - 4 - 6 - 8 - 10 - 12 - 14 - 16 - 18 - 20
Direction
INOUT
INOUT
PD
GND
Signal
P2 (5-pin): standard USB connector
Table 17. P2
Pin
1
2
3
4
5
Direction
IN
INOUT
INOUT
INOUT
INOUT
VUSB (5 V)
D-
D+
GND
SHIELD
Signal
Table 18. J2
J2
Function
22/24
CLOSE 1 - 2: USB direct supply
OPEN 1 - 2: Alternative supply from P1
DocID025513 Rev 1
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6
Revision history
Revision history
Table 19. Document revision history
Date
Revision
27-May-2014
1
Changes
Initial release.
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AN4395
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