Features
• Based on S2-LP radio
• S2-LP narrow band ultra-low power sub-1 GHz transceiver tuned for 860 - 940
MHz frequency band
• Programmable RF output power up to +16 dBm
• Modulation schemes: 2-FSK, 2-GFSK, 4-FSK, 4-GFSK, OOK and ASK
• Air data rate from 0.1 to 500 kbps
• Ultra-low power consumption: 7 mA RX and 10 mA TX at +10 dBm
• IEEE 802.15.4g hardware packet support with whitening, FEC, CRC and dual
SYNC word detection
• RX and TX 128 byte FIFO buffers
• Support to wireless M-Bus
• Excellent performance of receiver sensitivity (up to -130 dBm)
• Automatic acknowledgement, retransmission and timeout protocol engine
• Compatible with STM32 Nucleo boards
• Compatible with Arduino UNO R3 connectors
• Support to SMD and SMA antennas
•BALF-SPI2-01D3 IPD balun for matching network and harmonics filter
• Sigfox compatible
• Sample firmware for P2P communication
• 6LoWPAN compatible thanks to STM32Cube
• RoHS compliant
Description
The X-NUCLEO-S2868A1 expansion board is based on the S2-LP radio and
operates in the 868 MHz ISM frequency band.
The expansion board is compatible with ST morpho and Arduino UNO R3
connectors.
The X-NUCLEO-S2868A1 interfaces with the STM32 Nucleo microcontroller via SPI
connections and GPIO pins. You can change some of the GPIOs by mounting or
removing the resistors.
Product summary
Sub-1 GHz RF
expansion board
based on S2-LP
radio for STM32
Nucleo
X-NUCLEO-S2868A1
Ultra-low power,
high
performance,
sub-1 GHz
transceiver
S2-LP
50 Ω nominal
input/conjugate
match balun to
S2-LP
, 868-930
MHz with
integrated
harmonics filter
BALF-SPI2-01D3
Sub-1 GHz 868 MHz RF expansion board based on S2-LP radio for STM32
Nucleo
X-NUCLEO-S2868A1
Data brief
DB3602 - Rev 1 - May 2018
For further information contact your local STMicroelectronics sales office.
www.st.com
1X-NUCLEO-S2868A1 schematic diagram
Figure 1. X-NUCLEO-S2868A1 circuit schematic
VDDSMPS
2 17
RR3388
11
VRRF
12
RR3366
LL88
7
SCL
VDDANASYNTH
YY11
3
nS
1
CC44
D5
CC3300
RX_P
A1
GND
4
GPIO1
NC 6
VDDVCOTX
TX
SDI
CC2255
UU22
CC11
CC__110000pp__00440022
B2
GND1 A2
RXN
VDD
1
OUT
22..22KK
VDDVCOTX
VDDVCOTX
22..22KK
+3V3
NNMM
LL1111
VDD
GPIO0
TX
RR11
VDD
CC__115500nn__00440022
CC3322 CC1122
VRSYNTH
CC__44..77UU__00660033
13
RXP 14
RR__110000kk__004400
RR33
GPIO0 20
GPIO1
1100uuFF
00RR
RR3333
AAMM1111DDGG--SSTT0011
CC__11uu__00660033
CC__115500nn__00440022
Q
2
CC3366
VDDANASYNTH
8
VDDSMPS
VSMPS2
LL__1122nnHH__00660033
GND
25
CC__115500nn__00440022
GPIO3
7
1
nHOLD
C6
RR2244
+3V3
BBAALLFF--SSPPII22--0011DD33
110000nnFF
GND2
RR3355
CC__115500nn__00440022
CC2222
6SDN
VRSYNTH
RR3377
00RR
SDI
CC__1122ppFF__00660033
LL1133
NNMM
7
OUT
+3V3
+3V3
UU33
GPIO2
SSMMAA AANNTTEENNNNAA
21
22
CC__110000pp__00440022
2
VRSYNTH
9
C2
ANT
XIN
5
IN
IN
MM9955664400
RR__110000kk__00440022
CC1100
LL1122
LL77
1RESET
NNMM
22..22KK
CC3355
2VCC
LL22
VDDRXDIG
GPIO2
C1
RX_N
B1
CC99
CC55
18
SDI
VREFVCO
10
110000ppFF
CC__115500nn__00440022
SCL
CSN
CC__110000pp__00440022
RR22
CC__110000nn__00440022
LL__1100UU__00880055
110000ppFF
1. 4 V t o 1. 8 V ma x
SDO
15
UU11
CC4411
SDA
CCRRYYSSTTAALL__NNXX11661122SSAA
UU44
VDD
SDN
CC__447700pp__00440022
CC4422
nS
VSMPS2
CC__115500nn__00440022
CC88
SMPS2
4XOUT
16
SCLK
CC1133
NC
3
44..77nnHH
SCLK
CC22
SCLK
1100ppFF
CC1177
NNMM
8
VCC
RR__110000kk__00440022
CC3344
VDDRXDIG
VDDRXDIG
SDO
SDA
CC66
SSTTSSAAFFEE--AA110000
5
SMPS1
3
JJ11
1100RR
4
CC1144
4VSS
NC 8
CSN 19
SDO
nW
3
CC__110000pp__00440022
SS22--LLPP
VDDANASYNTH
EE11
+3V3
VDDSMPS
CC__115500nn__00440022
CC1166
23
GPIO3
VRDIG 24
NNMM
NNMM
Figure 2. X-NUCLEO-S2868A1 circuit schematic - Arduino connectors
1
CN9
CSN
D6
7
CN5
SDA
GPIO3
PC7
+5V
1
3V3
4
A0
1
PWM/D10
4
IOREF
D7
8
SCL
SDN
AREF
9SDA
nS
R14
NM
+3V3
3
PWM/D9
3
R7
8
PA3
R13
R9
SCL
10
0
CSN
R16
NM
8 pass-through:
male on bottom
and female on top
0
6
GND
2
R18
7
GND
PA2
JUMPER
nS
0
A4
5
SDI
1
0
5V
5
2
SCK/D13
7GND
MOSI/PWM/D11
5
SDO
0
PC7
RESET
R12
R15
6
D5
6
NC
1
D11
Pass-through:
male on bottom
and female on top
ARDUINO UNO R3 SX connector
CN8
NM
JP1
MISO/D12
6
D8
D4
5
RESET
2
R23
A5
0
D2
3
VDD
A3
4
RXD/D0
2
SCLK
R10
NM
GPIO1
330
GPIO0
A2
3
TXD/D1
SCLK
SDN
NM
0
VIN
GPIO0
R6
LED
GPIO2
AVDD
D3
4
0
IOREF
0
R11
R22
8
VIN
CN6
A1
2
0
ARDUINO UNO R3 DX connector
R4
R5
R17
Pass-through:
male on bottom
and female on top
R19
NM
6 pass-through:
male on bottom
and female on top
X-NUCLEO-S2868A1
X-NUCLEO-S2868A1 schematic diagram
DB3602 - Rev 1 page 2/5
Figure 3. X-NUCLEO-S2868A1 circuit schematic - morpho connectors
PC11
PD2
E5V
IOREF
RESET
+3V3
+5V
VIN
PA0
PA1
PA4
PB0
PC1
PC0
PC9
PB8
PB9
AVDD
PA5
PA6
PA7
PB6
PC7
PA9
PA8
PB10
PB4
PB5
PB3
PA10
PA2
PA3
NC/PF4
NC/PF5
PC4
AGND
PB13
PB14
PB15
PB1
PB2
PC10
PC12
PB11/NC
VDD
BOOT0
PB12
NC/PF6
NC/PF7
PA11PA13
PA14
PA12
PA15
PD8
PB7
PC14
PC6
PC8
PC2
PC3
CN10
1
13
15
17
19
21
23
25
27
29
31
33
35
37
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
CN7
13
15
17
19
21
23
25
31
33
PH0/PF0/PD0
29
35
PH1/PF1/PD1
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
ST morpho SX connector
Pass-through:
female on bottom
and male on top
ST morpho DX connector
3
5
7
9
11
2
4
6
8
2
4
6
8
1
3
5
7
9
11
27
37
PC13
VDD
PC15
VLCD/VBAT
PC5
U5V
Pass-through:
female on bottom
and male on top
X-NUCLEO-S2868A1
X-NUCLEO-S2868A1 schematic diagram
DB3602 - Rev 1 page 3/5
Revision history
Table 1. Document revision history
Date Version Changes
11-May-2018 1 Initial release.
X-NUCLEO-S2868A1
DB3602 - Rev 1 page 4/5
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X-NUCLEO-S2868A1
DB3602 - Rev 1 page 5/5
