June 2016
DocID029425 Rev 2
1/11
For further information contact your local STMicroelectronics sales
office
www.st.com
STEVAL-ISA172V2
2 kW fully digital AC-DC power supply (D-SMPS) evaluation
board
Data brief
Features
Input AC voltage: 90 V to 264 V
Output voltage: 48 V or 52 V, Max output
current: 42 A
Input AC frequency: 45 Hz to 65 Hz
Nominal output power: 2 kW
Interleaved PFC stage
PFC switching frequency: 60 kHz
PFC Average current mode control
Cycle by cycle PFC current control
Maximum power factor: 0.99
DC-DC stage: full-bridge phase-shifted ZVS
with synchronous rectification
DC-DC switching frequency: 100 kHz
Overall efficiency: 80 PLUS Platinum level
HF transformer isolation voltage: 4 kV
Forced cooling with air flow speed
modulation according to the output power
Over-temperature protection
Output short-circuit protection
PFC control & DC-DC control: managed by
STM32F334C8
PFC power stage based on MDmesh M2
Power MOSFETs and SiC Diodes
DC-DC power stage based on MDmesh
DM2 Power MOSFETs
Synchronous rectification based on
STripFET Power MOSFETs
Active clamp circuit based on MDmesh DM2
Power MOSFETs
EMC filter for noise reduction
RoHS compliant
Description
The STEVAL-ISA172V2 is a 2 kW fully digital
switch mode AC-DC converter consisting of two
power sections: a two phase interleaved power
factor corrector (PFC) and a DC-DC phase-
shifted full-bridge converter, controlled by a
STM32F334 microcontroller for each section.
The interleaved PFC comprises two boost
converters operating with 180° out of phase,
based on 600 V MDmesh M2 Power MOSFETs.
The downstream section comprises of a DC-DC
phase-shifted full-bridge converter based on
MDmesh DM2 Power MOSFETs and performing
voltage step down using HF transformer, with a
primary to secondary ratio chosen to maintain
high enough efficiency and regulation over the
entire operating range.
On the primary side the transformer is supplied
by the full-bridge converter and switching losses
are reduced thanks to zero voltage switching
(ZVS) operation.
On the secondary side synchronous rectification
(SR) is used to ensure low conduction losses.
The output voltage waveform is rectified by
STripFET Power MOSFETs and then smoothed
by the output filter.
Additional information
STEVAL-ISA172V2
2/11
DocID029425 Rev 2
1 Additional information
The combination of the design choices results in boosted efficiency, in line with standard
requirements in the power supply industry. The system is controlled by two STM32F334
microcontrollers, one for each section. This microcontroller adds innovative features such
as a high-resolution timer, which gives increased accuracy in terms of current regulation on
the primary PFC and on the secondary DC-DC phase-shifted full-bridge side. The two
microcontrollers exchange information about the status of the input and output power stage
via bidirectional serial communication. Both the power stage and control stage are supplied
by an off-line flyback circuit based on the VIPer27H, which provides a suitable regulated
voltage to the microcontrollers, as well as the gate driver ICs and the signal conditioning
circuits.
STEVAL-ISA172V2
Schematic diagrams
DocID029425 Rev 2
3/11
2 Schematic diagrams
Figure 1: STEVAL-ISA172V2 circuit schematic: Input section and EMI filter
Vin_N
Vin_N
Vin_P
Vin_P
VIN_PFC
VACSENSE
+3.3 pri
VCC pri
RELAY CONTROL
GND1
GND1
GND1
GND1
GND1
GND1
0
0
0
GND1
0
C121
10nF
R16
470k
CP8
Clips
1
CP5
Clips
1
Q15
2STR1230
1
23
SHI1
Shield EMI Suppressor
1
CP6
Clips
1
R15
470k
D6
STPS1L30
CP2
Clips
1
R22 470k
C19
100pF
C126
1uF 250V
L2
2
1
3
4
TSV611ILT
U4
Out4
Vcc- 2
In+
1
In-
3
Vcc+
5
RL1
11 14
A1
A2
R14
470k
TP53
1
R21 470k
R20 470k
R26
5k
C17
470nF
C142
N.A.
-+
D7
40A/600V
2
1
3
4
F1
25A/600V
C23
N. A.
R11
10
CP9
Clips
1
J1
VIN
1
3
2
CP4
Clips
1
C123
33nF
MOV1
C18
470nF
R12
47
R19 470k
U18
BAR43S
1
2
3
TP22
1
C15
10nF
R18
10k
CP7
Clips
1
C21
1uF
C122
10nF
CP10
Clips
1
R25
1K
CP3
Clips
1
R17
10k
t
R13
10R
R24 470k
C16
470nF
C22
N.A.
L13
2
1
3
4
C120
470nF
C24
1nF 300VDC (Y1) N.A.
C14
220nF
C13
10nF
R23 470k
C20
100nF
GSPG1006150955SG
Schematic diagrams
STEVAL-ISA172V2
4/11
DocID029425 Rev 2
Figure 2: STEVAL-ISA172V2 circuit schematic: Interleaved PFC
Remove Resistor in
case of four lead
Mosf et
Remove Resistor in
case of four lead
Mosf et RemoveResistorin
caseoffourlead
Mosfet
RemoveResistorin
caseoffourlead
Mosfet
VIN_PFC
PFC_Ipk_1
VBUS
GND_PFC
PFC_Ipk_2
PFC_I_AVG
+3.3 pri
PFC_VBUS_SENSE
PWMQ10
ENABLEQ10
VCCpri
PWMQ9
ENABLEQ9
GATEQ9
GATEQ10
GATEQ9
GATEQ10
GND_PFC
GATEQ9 GATE Q10
SOURCE Q9
SOURCE Q9
SOURCEQ10
SOURCEQ10
400VDC
1
1
GND1
0
1
1
GND1
GND1
GND1
1
GND1
GND1
GND1
GND1
GND1
GND1
1
R190
470K1W
R205
0R
Q10
STW48N60M2-4 / STW48N60M2
4
21 3
R48
10k
D18
MMSZ4705
12
R202
1.5K
+C26
470u
R40
2.7N.A.
R36
100
R35
4.7K
R45
33
R28
180K
Q9
STW48N60M2-4 / STW48N60M2
4
21
3
L4
140uH
12
3
4
R59
10
R46
33
R201
1.5K
D73
TS756
1 2
D11
SPS1H100
12
J15
Power_Jump
12
R51
27k
C37
1uF
R185
0R
R27
180K
D13
STPS1L30
12
D10
SPS1H100
12
R189
470K1W
IC5
PM8834
ENABLE_1
1
PWM_1
2
GND
3PWM_2
4OUT_2 5
VCC 6
OUT_1 7
ENABLE_2 8
R57
470
C143100pF
R53 330
R2091R
R204
0R
R206
0R
R49
100
R207
0N.A.
TP54
1
+C28
470u
R47
10k
C34
470p
C40
100p
R30
0R
R39
2.7N.A.
D19
MMSZ4705
12
R200
10K
T3
CURR_TRANS
11 2
12 4
5
3
1
8
9
10
6
7
Q9A
STW48N60M2-4 /STW48N60M2
4
21 3
L3
140uH
12
3
4
R198
10K
R191
470K1W
R38
Not Assembly
D14
STPS1L30
12
t
HT2
Heatsink 2
R203
0R
TSV911ILT
U5
Out
1Vcc-
2
In+
3In- 4
Vcc+5
R44
33
C30
100pF
R2081R
R197
10K
R54
100k
+C25
470u
R37
3.6K
R43
33
R31
200
D17
MMSZ4705
12
C42
470p
D16
MMSZ4705
12
R33
180K
C29
100pF
J16
Power_Jump
12
D12
STPS1L30
12
C35
100nF
R58
27k
D9
STPSC1006D
3 1
R42
2.7N.A.
D8
STPSC1006D
3 1
R50
470
C41
100p
R55
100k
R29
200
C36
100pF
T2
CURR_TRANS
11 2
12 4
5
3
1
8
9
10
67
R52 330
R56
100C38
100p
R34
4.7K
+C27
470u
C43
470p
R41
2.7N.A.
C39
100p
Q10A
STW48N60M2-4 /STW48N60M2
4
21 3
R199
10K
C33
100pF
R32
0R
RSENSE1
2mOhm
1 2
4
3
D15
STPS1L30
12
GSPG0806161040SG
STEVAL-ISA172V2
Schematic diagrams
DocID029425 Rev 2
5/11
Figure 3: STEVAL-ISA172V2 circuit schematic: Phase shift DC-DC converter
D71
TZMC16-GS08
1 2
R114
8.2
R82
3.3
D75
SPS1H100
TP43
11
C114
33n
R84
1k
TP42
11
C48
470n
C62
100nF 100V
R73
3.3
R96
10k
STP24N60DM2
M2
1
2 3
C51
470u
TX3
n 1:70
8
8
1
1
7
7
3
3
4
2
5
6
TP39
11
R88
360k
D29
STPS1L30
12 C128
1uF
R172 4R7
1 2
R86
10k
R168
2.2 1/2W
12
R115
8.2
C65
1uF
F5
2A
D31
Bar46
D63
STTH16L06C
1
2
3
D69
TZMC16-GS08
1 2
C117
1uF
R83
3.3
R101
330
C115
15n
R186
10k
D32
STTH12R06G
31
2
C129
470u
Q4
STW35N60DM2
1 3
3 2
4
5
IC3
PM8834
ENB2 8
ENB1
1PWM1
2GND
3PWM2
4OUT1 7
VCC 6
OUT2 5
C54
56p
TP46
11
C49
10n
D36
Bar46
1
3
2J3
CON2
1
2
3
4
D27
MMSZ4705
12
J4
CON2
1
2
R80
3.3
J12
Jump
1
2
R94
6.04K
D66 STTH16L06C
1
2
3
R211 0.1
TP44
11
IC1
PM8834
ENB2
8ENB1 1
PWM1 2
GND 3
PWM2 4
OUT1
7VCC
6OUT2
5
R167 2.2 1/2W
1 2
L5
LT 40063 15uH 50A
R97
6.04K
L11
PulseTransformer
4 1
3 2
STP24N60DM2
M1
1
2 3
R102
100k
C106
3.3uF 250V
R165
10k
R89
1k
L10
220uH
1
1
2
2
C118
1uF
R184
0R
Q14
Q3
STW35N60DM2
1
3 2
4
5
Q12
C58
100nF 100V
D38
Bar46
D23
STTH12R06G
31
2
R71
200
C52
470u
D20
LL124148
R171
100
TP45
1
1
R195
10K
R77
10k
R98
10k
C105
3.3uF 250V
R169
10K 1/2W
12
R95
10k
C110
0.47uF
R103
100k
D25
Bar46
D65 STTH16L06C
1
2
3
C59
100p
C102
100p
R90
1k
R79
3.3
TP47
11
C130
1uF
D21
STPS1L30
12
C124
100nF 400V
C100
100p
L14
3K9uH
HT1
Heatsink1
t
R108
0 (n.c.)
R106
330
D43
SPS1H100
C111
470nF
12
R120
100k
Q1
STW35N60DM2
1
3
2
2
4
4
5
D34
MMSZ4705
12
R116
330
C131
470u
C57
100p
STU2N62K3
M4
1
2
3
C60
100p
D67
TZMC16-GS08
1 2
L9
220uH
1
1
2
2
TP48
1
1
L6
30uH
1
2
R99
33
C55
56p
D42
MMSZ4705
12
R92
10k
R110
100k
R119
100k
C56
56p
C47
470pF
C101
100p
D72
STPS340U
12
R175
100k
1
2
R112
8.2
C53
470u
R78
10k
R113
10k
C109
0.47uF
D35
Bar46
Q16
STD12NF06LT4
D40
MMSZ4705
12
D26
MMSZ4705
12
R111
100k
R75
3.3
C107
0.47uF
D28 STPS1L30
12
R170
4R7
12
R74
3.3
C67
100p
R178
10K 1/2W
12
C125
100nF 400V
R188
0k
R81
360k
TP40
1
C50
470u
D30
Bar46
D41
MMSZ4705
12
D37
Bar46
D39
MMSZ4705
12
C63
100p
D22
STPS1L30
12
TP55
1
IC4
PM8834
ENB2 8
ENB1
1PWM1
2GND
3PWM2
4OUT1 7
VCC 6
OUT2 5
R107
330
STU2N62K3
M3
1
2
3
J2
CON2
1
2
R105
33
Q13
C116
1uF
R174
100
C61
1uF
Q11
R93
10k
R118
330
C119
1uF
TX1
1
2
5
3
4
6Lp
Ls1
Ls2
D64
STTH16L06C
1
2
3
TP41
11
R117 8.2
TP37
11
D70
TZMC16-GS08
1 2
C64
100p
R177
2.2 1/2W
12
C68
100p
J11
12
R85
10k
R100
330
R176
100k
1
2
D68
STPS340U
12
R91
22k
Q2
STW35N60DM2
1 3
3
2
2
4
5
L12
PulseTransformer
4 1
3 2
R76
3.3
C108
0.47uF
T4
TP40001
3
4
12
9
11
1
6 7
5
2
10
8
D33
MMSZ4705
12
R173 2.2 1/2W
1 2
R109
51
D24
Bar46
R70
0R
R87
360k
C66 1uF
IC2
PM8834
ENB2
8ENB1 1
PWM1 2
GND 3
PWM2 4
OUT1
7VCC
6OUT2
5
R104
10k
R72
18
TP38
11
R210 0.1
TX2
1
2
5
3
4
6Lp
Ls1
Ls2
Earth
Earth
Earth
Source_Q13/Q14
Source_Q11/Q12
Source_Q13/Q14
Source_Q11/Q12
GND1
GND2
GND2
GND2
GND2
GND2
GND2
GND2
GND2
GND2
2
GND2
GND2
GND2
GND2
GND1 GND1
BRIDGE CURRENT SENSE
VBUS
SR2 Vsense
SR1 Vsense
VOUT sense
VCC sec
PWM Q1
PWM Q2
VCC sec
PWM Q3
PWM Q4
VCC sec
PWM Q11/Q12
PWM Q13/Q14
Enable_fullBridge
ENABLE SR
Enable_fullBridge
GATE Q14
GATE Q12 GATE Q14
GATE Q12
GATE Q2
SOURCE Q1
SOURCE Q2
GATE Q1
GATE Q3
SOURCE Q3
SOURCE Q4
GATE Q4
GATE Q1
SOURCE Q1
GATE Q2
SOURCE Q2
GATE Q3
SOURCE Q3
GATE Q4
SOURCE Q4
48V sec
48V sec
ENABLEFAN
PWM 1 CLAMP
gate CLAMP 2
Source CLAMP 2
Source CLAMP 1
gate CLAMP 1
PWM 2 CLAMP
SOURCE CLAMP 1
SOURCE CLAMP 2
GATE CLAMP 1
GATE CLAMP 2
VCC sec
ENABLE Clamp
GATE Q11
GATE Q13
GATE Q11 GATE Q13
ISOLATION BARRIER
For Current probe sensing
External fan supply voltage
Remove J12 before apply
external supply voltage
+
-
F2
FAN
F3
FAN
GSPG0906160910SG
Schematic diagrams
STEVAL-ISA172V2
6/11
DocID029425 Rev 2
Figure 4: STEVAL-ISA172V2 circuit schematic: Primary MCU
15V
V_pri_Viper
PFC_USART1_TX
PFC_USART1_RX
DAC_OUT1
DAC_OUT2
PFC_VAC
PFC_Current CT1
HRTIM_CHB1
PFC_Current CT2
HRTIM_CHA1
PFC_Vbus
PFC_Current R-shunt
V_pri_Viper
PFC_Vbus
PFC_Current R-shunt
PFC_Current CT2
PFC_VAC
PFC_USART1_TX
PFC_USART1_RX
PFC Temperature
PFC_Current CT1
PFC Temperature
COMP4-Out
PFC_Current R-shunt
COMP2-Out
PFC_Current CT1 PFC_Current CT2
RELAY CONTROL
PFC USART1_RX
PFC USART1_TX
PFC_I_AVG
VACSENSE
PWM Q9
PWM Q10
PFC_Ipk_1 PFC_Ipk_2
PFC_VBUS_SENSE
VCC pri
GND_SIGNAL_1
+3.3 pri
ENABLE Q10
ENABLE Q9
+3.3 pri
+3.3 pri
+3.3 pri
+3.3 pri
+3.3 pri
+3.3 pri
+3.3 pri
+3.3 pri
+3.3 pri
+3.3 pri
+3.3 pri
+3.3 pri
+3.3 pri +3.3 pri
+3.3 pri
1
1
1
1
1
11
1
1
1
1
1
1
1
11
1
1
1
+3.3 pri
1
11
R124
620
TP5
11
X1 8MHz HC49/US R131470
C70
22pF
D79
BAT754
C80
2.2nF N.A.
D53
BAT754
D52
BAT754
R122
4.7k
R139
2k
TP7
11
C71
100nF
TP23
1
1
L7
Ferrite Bead
C75
100nF
TP33
11
R137
330
C69
100nF
TP25
11
J7
Ground 1
1
2
3
4
C83 47pF
J5
PMBUS-I2C
1
2
3
C81 2.2nF
C79
100nF
C72
22pF
R129620R
C73 10nF
1 2
TP24
1
1
U10 LM19CIZ
VO 2
3
GND
+VS
1
C84
100nF
R135
0R
R126
0
TP4
11
TP32
11
R132
470R
TP9
11
R127 0
C77
100nF
C82 47pF
D47 Blue LED
R123
10k
1
2
TP6
11
R130470
J6
GND CON
1
2
3
4
C76
100nF
TP8
1
1
D51
BAT754
D48
BAT754
TP31
11
TP3
11
D49
BAT754
R133
100R
U9
STM32F334C8T6 (LQFP48)
PA0-WKUP
10
PA1
11
PA2
12
PA313
PA414
PA515
PA616
PA717
PA829
PA930
PA10 31
PA11 32
PA12 33
PA13 34
PA14
37 PA15
38
PB018
PB119
PB220
PB3
39 PB10 21
PB11 22
PB12 25
PB13 26
PB14 27
PB15 28
PB4
40 PB5
41 PB6
42 PB7
43 PB8
45 PB9
46
PC14
3
PC15
4
PF0/OSC-IN
5
PF1/OSC-OUT
6
NRST
7
BOOT0
44
VBAT
1
VSSA
8
VSS_2 23
VSS_3 35
VSS_1
47
VDDA
9
VDD_2 24
VDD_3 36
VDD_1
48
PC13/TAMP/RTC
2
R134
0
TP34
11
+
C74
1µF
TP10
11
R128 0
TP1
11
R138
10k
C78
100nF
R136
330
TP2
11
R121
4.7k
D46
Green LED
D50
BAT754
D80
BAT754
GSPG2710151630SG
STEVAL-ISA172V2
Schematic diagrams
DocID029425 Rev 2
7/11
Figure 5: STEVAL-ISA172V2 circuit schematic: Secondary MCU
12V
V_sec_Viper
DCDC_USART1_TX
V_sec_Viper
DCDC_USART1_RX
DCDCPWM_LS1
DCDCPWM_HS1
DCDC_Vout DCDC_Iin
DCDCPWM_LS2
DCDCPWM_HS2
DCDCPWM_SR2
DCDCPWM_SR1
DCDC_VDS_SR1
DCDC_VDS_SR2
DCDC_VDS_SR1
DCDC_VDS_SR2
DCDC_Vout
DCDCPWM_HS1
DCDCPWM_LS1
DCDCPWM_HS2
DCDCPWM_LS2
DCDCPWM_SR1
DCDCPWM_SR2
COMP2_INP
ADC1_IN4
DCDC_Iin
DCDC_USART1_TX
DCDC_USART1_RX
DCDCTemperature
DCDCPWM_Clamp1
DCDCPWM_Clamp2
COMP2_OUT
DCDC_VDS_SR1 DCDC_VDS_SR2
SR2 Vsense
PWM Q2
SR1 Vsense
PWM Q1
BRIDGE CURRENT SENSE
VOUT sense
ENABLE FAN
+3.3 sec
GND_SIGNAL_2
PWM Q4
PWM Q3
PWM Q13/Q14
PWM Q11/Q12
VCCsec
DCDCUSART1_RX
DCDCUSART1_TX
Enable_fullBridge
ENABLE SR
ENABLE Clamp
PWM 1 CLAMP
PWM 2 CLAMP
+3.3 sec
+3.3 sec
+3.3 sec
+3.3 sec
+3.3 sec
+3.3 sec
+3.3 sec
+3.3 sec
+3.3 sec
2
2
2
+3.3 sec
2
22
2
2
2
22
2222
2
2
2
2
2
2
+3.3 sec
+3.3 sec +3.3 sec
+3.3 sec
+3.3 sec
GND22
+3.3 sec +3.3 sec
R157
100R
R159
0
TP12
11
R146 0R
R147 0R
L8
Ferrite Bead
U11
STM32F334C8T6 (LQFP48)
PA0-WKUP
10
PA1
11
PA2
12
PA313
PA414
PA515
PA616
PA717
PA829
PA930
PA10 31
PA11 32
PA12 33
PA13 34
PA14
37 PA15
38
PB018
PB119
PB220
PB3
39 PB10 21
PB11 22
PB12 25
PB13 26
PB14 27
PB15 28
PB4
40 PB5
41 PB6
42 PB7
43 PB8
45 PB9
46
PC14
3
PC15
4
PF0/OSC-IN
5
PF1/OSC-OUT
6
NRST
7
BOOT0
44
VBAT
1
VSSA
8
VSS_2 23
VSS_3 35
VSS_1
47
VDDA
9
VDD_2 24
VDD_3 36
VDD_1
48
PC13/TAMP/RTC
2
TP27
1
1
D58
BAT754
TP21
11
R150 0R
R140
4.7k
R149 0R
TP16
11
X2
8MHz HC49/US
R179
360N.A.
D56
BAT754
TP14
11
C98 47pF
C92
100nF
R143620
U14
BAR43S
1
2
3
TP28
1
1
C88
22pF
TP17
11
D59
BAT754
TP29
11
R144
470
12
R155470
D55
Blue LED
R161
4k3
TP20
11
D57
BAT754
J8
PMBUS-I2C
1
2
3
TP18
11
R153 0R
TP15
11
C97 47pF
C94
100nF
C96
100nF
C85
100nF
R148 0R
R158
13k
R151 0R
R141
4.7k
R156470
TP11
11
C89 10nF
1 2
C87
100nF
D60
BAT754
R154470
R180
360N.A.
C91
100nF
R160
0
C86
22pF
J9
Ground 2
1
2
3
4
+
C90
1uF
D54
Green LED
TP13
11
J10
GNDCON
1
2
3
4
C95
100nF
U12 LM19CIZ
VO 2
3
GND
+VS
1
R142
10k1
2
R145
620
C99
100nF
R152 0R
U13
BAR43S
1
2
3
C93
100nF
TP30
11
TP19
TEST POINT
11
R162
1k
GSPG2710151600SG
Schematic diagrams
STEVAL-ISA172V2
8/11
DocID029425 Rev 2
Figure 6: STEVAL-ISA172V2 circuit schematic: Auxiliary power supply
12V
5V
+3.3 pri
+3.3 sec
VCCpri
VBUS VCCsec
2
1
GND1
GND1
GND1
GND1
GND1
GND2
GND1
GND2
GND2
GND2
GND2
GND2
GND1
GND1
TP52
11
C5 2.2nF
U3
LD1117
GND 1
VOUT 2
VIN 3
L1 1uH
R194
0
TP49
11
R8
47k
D5
STPS1150A
R3
N.A.
+C7
100uF
D77
STPS1150A
D1
PKC-136
D4
STPS1150A
R7
82k
R9
8.2k
U1
LD1117
GND 1
VOUT 2
VIN 3
R10
2K
R4
220
BR
CONT
DRAIN
SOURCE
CONTROL
VDD
FB
U2
VIPER27HD
75
16 1
6
10
15
14
13
2
9
83
4
11
12
R6
2.2K
TP51 TEST POINT
1
1
C6
22uF25V
OPTO1
PC817
1 2
4 3
D76
STPS1150A
2.2 1R
C3
470uF
R193
0
D3
STPS1L40U
VR1
TS2431
31
2
C4
100uF16V
R2 3.3
D74
DIODEZener15V1W
TP50
TEST POINT
11
R196
3.3
C10
470uF25V
C8
33nF
R192
0
R5
1k
T1
4
6
9
2
1
10
8
7
5
3
+C127
100uF20V
D78
DIODE Zener15V1W
C12
3.3nF
C2
470uF
C11
33nF
+C9
100uF20V
D2
STTH102A
C1
0.1uF
GSPG100615 1120SG
STEVAL-ISA172V2
Schematic diagrams
DocID029425 Rev 2
9/11
Figure 7: STEVAL-ISA172V2 circuit schematic: Communications
PFC USART1_RX
PFC USART1_TX
DC-DCUSART1_RX
+3.3 sec
GND_SIGNAL_2
GND_SIGNAL_1
+3.3 pri
DC-DCUSART1_TX
+3.3 pri
1
2
2
2
2
1
1
+3.3 pri
+3.3 sec
+3.3 sec
1
1
2
R66 820
R67 47
SHIELD
PS9821
U8
2
3
7
8
5
1
4
6
R62 47
C103
15pF
R63 0
R68 0
R65 39
SHIELD
PS9821
U7
2
3
7
8
5
1
4
6
R69 0
C45
100nF
C104
15pF
C44
100nF
R60 39
R64 0
R61 820
GSPG1006151140SG
STEVAL-ISA172V2
DocID029425 Rev 2
11/11
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