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STEVAL-FKI868V1
Sub-1 GHz transceiver development kit based on S2-LP
Data brief
Features
S2-LP narrow band ultra-low power sub-1
GHz transceiver in a standalone RF Module
tuned for 860 - 940 MHz frequency bands
STM32 Nucleo development board with
STM32L152RE MCU
Suitable for Wireless M-Bus systems
Associated S2-LP development kit including,
documentation, firmware for STM32L and
GUI
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 0.3 to 500 kbps
Ultra-low power consumption:
6.7 mA RX
10 mA TX at +10 dBm
Excellent performance of receiver sensitivity
(up to -130 dBm)
Low duty cycle RX / TX operation mode
Automatic acknowledgement,
retransmission, and timeout protocol engine
SPI interface for microcontroller
USB interface
RoHS compliant
Description
The STEVAL-FKI868V1 evaluation board is
based on the S2-LP sub-1 GHz ultra-low power
low data-rate transceiver, suitable for ISM bands
and Wireless M-Bus.
The main board is the NUCLEO-L152RE
development board, equipped with a low power
microcontroller STM32L to control the S2-LP and
the ST-LINK/V2-1 debugger and programmer for
firmware updating.
Schematic diagram
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DocID029972 Rev 1
1 Schematic diagram
Figure 1: STEVAL-FKI868V1 circuit schematic
SDN
SDO
SDI
SCLK
CSN
GPIO0
GPIO1
GPIO2
GPIO3
nS
SCL K
SDI
SDO
GPIO0
CSN
SCL K
VDDSMP S
VDDSMP S VDDANAS YNTH
VDDSMP S
VRS YNTH
VRSYNT H
VDDANAS YNTH
VDDVCOT X
VDDVCOT X
VDDR XDIG
VDDR XDIG
SDISDO
CSN
nS
SDN
GP IO1
GP IO2
GP IO3
SCL K
VSMPS 2
VSMPS 2
VSMPS 2
VSMPS 2
3V3
3V3VDD
VDDVDD
VDDVDD
VDD
C26
C_TBD_040 2
CN1
CON1 0
1
2
3
4
5
6
7
8
9
10
R17NM
C21
C_TBD_040 2
L8
L_TBD_040 2
C22
C_150 n_040 2
L7
L_TBD_060 3
C31
C_100p_040 2
R7 0
R11 0
C15
C_TBD_040 2
L5 L_TBD_040 2
Vsmps_e xt
R4 0
R6 NM
JP1
Jumpe r2
1
122
C10
C_470 n_040 2
U2
S2-LP
VDDSMP S
1
SMPS 1
2
SMPS 2
3
XOU T
4
XIN
5
SDN
6
VDDANASYNT H
7
VRSYNT H
8
VREFVC O
9
VDDVCOT X
10
TX
11
VRR F
12
VRD IG 24
GP IO3 23
GP IO2 22
GP IO1 21
GP IO0 20
CSN19
SCL K 18
SDI17
SDO16
VDDR XDIG 15
RXP 14
RXN 13
GN D
25
C11
C_100p_040 2
C14 C_TBD_040 2
C8
C_100p_040 2
R21
0 ohm
R20NM
J1
RF_ IN/OU T
L6
L_TBD_040 2
C4
C_100p_040 2
R18 NM
C19
C_12p_040 2
C29
C_TBD_040 2
R13 0
L4
L_TBD_040 2
C27
C_TBD_040 2
R2
R_100k_040 2
C18C_TBD_040 2
C32
C_150 n_040 2
L9
L_TBD_040 2
R160
CN4
CON 6
1
2
3
4
5
6
Y1
XTAL
C2
C_150 n_040 2
L2
L_10U_080 5
C17C_TBD_040 2
C23
C_100p_040 2R22
NM
C30
C_470 n_040 2
R5 0
C20
C_12p_040 2
R19 NM
L3 L_TBD_040 2
R140
C16
C_TBD_040 2
CN2
CON 8
1
2
3
4
5
6
7
8
U1
M9564 0
nS
1
Q
2
nW
3
Vss
4
Vcc8
nHOL D 7
C6
D5
L1
L_TBD_040 2
C5
C_470 n_040 2
L10
L_TBD_040 2
CN3
CON 8
1
2
3
4
5
6
7
8
R12 0
C7
C_470 n_040 2
C34
C_150 n_040 2
R150
R3
R_100k_040 2
R10 0
C24
C_TBD_040 2
C9
C_100 n_040 2
C6
C_100p_040 2
C3
C_470 n_040 2
C13C_TBD_040 2
C25
C_470p_040 2
C33
C_100p_040 2
C12
C_1 u_060 3
C35
C_100p_040 2
C28
C_TBD_040 2
C1
C_4 .7U_060 3
R9 NM
R1
R_100k_040 2
GSPG04 11161000SG
STEVAL-FKI868V1
DocID029972 Rev 1
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2 Revision history
Table 1: Document revision history
Date
Version
Changes
10-Nov-2016
1
Initial release.
STEVAL-FKI868V1
4/4
DocID029972 Rev 1
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