ST STEVAL-ISC004V1 User manual

Introduction
The STEVAL-ISC004V1 evaluation board is a ready-to-use USB PD source based on STUSB4710A and ST1S14 ICs. It
demonstrates how to convert a fixed voltage DC power input into a USB PD variable voltage output.
The STUSB4710A acts as a Type-C port interface that ensures power delivery advertising and negotiation, drives the DC-to-DC
converter and power paths, and monitors VBUS voltage.
The ST1S14 device manages the step down conversion from the DC input port to the negotiated VBUS voltage.
The various LEDs indicate the operating status of the STUSB4710A and USB PD port.
The USB PD port is pre-configured with five different PDOs to address a broad range of applications (5 V, 9 V, 12 V, 15 V and
20 V).
Figure 1. STEVAL-ISC004V1 evaluation board
Getting started with the STEVAL-ISC004V1 evaluation board for the
STUSB4710A USB PD controller with on-board DC-DC
UM2293
User manual
UM2293 - Rev 2 - May 2019
For further information contact your local STMicroelectronics sales office.
www.st.com

1USB PD board overview
The STEVAL-ISC004V1 USB Type-C™ port is pre-configured with 5 PDOs at fixed voltage node (5 V, 9 V, 12 V,
15 V and 20 V).
The ST1S14 DC-DC is used as a step-down converter.
The STEVAL-ISC004V1 evaluation board features:
• 1 x USB PD port (source)
• STUSB4710A USB power delivery controller
• Compliant with:
– USB Type-C r1.2
– USB PD r2.0
• On-board DC-DC
• VBUS power switches and discharge path
• Support for up to 5 power data objects (PDO)
• Short-to-VBUS protections on CC pins (22 V) and VBUS pins (28 V)
• Customizable start-up profiles
• Compatible with NUCLEO-F072RB board for configuration and debug interface
• RoHS compliant
Figure 2. STEVAL-ISC004V1 functional diagram
1.1 How to use the board
Step 1. Connect a DC source with a minimum voltage of 22 V to either J0 DC socket or pins J0-A and J0-B.
Step 2. Connect the Type-C receptacle J2 to any device with a USB Type-C port using a USB Type-C to Type-
C cable. The green LED D12 lights up when a device is connected and the VBUS supply is present.
D12 lighting intensity changes according to the VBUS voltage value.
The STUSB4710A I²C interface can be used to customize application parameters: PDO, VBUS under
and overvoltage limits, VBUS discharge time, etc.
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USB PD board overview
UM2293 - Rev 2 page 2/14

Figure 3. STEVAL-ISC004V1 connected to PNUCLEO-USB001 as a sink
UM2293
How to use the board
UM2293 - Rev 2 page 3/14

2Schematic diagram
Figure 4. STEVAL-ISC004V1 circuit schematic
GND
FB
PG
Small signal
Power plane
GND
VIN OUT-ST1
GND
GND
ALERT#
RESET STM32_P STM32_N
3V3_Nuc 5V_Nuc P1 P2
P6 P10
P13
P1
P2 P6 P10
P13
GND GND
3V3_Nuc
5V_Nuc
3V35V
GND
J0
J0-A VIN
J0-B GND C2
10µF
C2'
10µF
C3
220nF
C1 100nF
Boot 1
Vin
7
GND
6
EN2
5
/EN1
3FB 4
PG 2
SW 8
U2 ST1S14PHR
D1
STPS5L25B
J1-A
Vsrc
L1 68µH
R2 200K
C4 100pF C4' NC
+
C5a
220µF
C5b 22µF
R1 NC
D3
NM
R33 2k2
R34
2k2
3V3 3V3
SCL
SDA
R3 13k R4
4k7
R5 4k87
R6
8k66
R7
33k
ME-03
ME-01 ME-05 ME-06
VSel_20V
VSel_15V VSel_12V VSel_9V
D51
1N4004
GND
A1
Tx+1
A2
Tx-1
A3
Vbus
A4
CC1
A5
D+1
A6
D-1
A7
Sbu1
A8
Vbus
A9
Rx-2
A10
Rx+2
A11
GND
A12 GND B1
Tx+2 B2
Tx-2 B3
Vbus B4
CC2 B5
D+2 B6
D-2 B7
Sbu2 B8
Vbus B9
Rx-1 B10
Rx+1 B11
GND B12
TYPE C
USB 3.1
J2
C51
10µF
tcD_N tcD_P
RD1 200
GND
GND
tcD_N tcD_P
tcD_N tcD_P
CC1
CC2
GND GND
SB7 SB8
P1 P2
P6
P10 P13
SB1
SB2 SB6
SB10 SB13
VBUS 1
D- 2
D+ 3
GND 5
ID 4
J55 Micro B
C55 4.7nF
C56 1µF
I/O1
GND
I/O2I/O2
Vbus I/O1
U55
USBLC6
5V
GND
D_N
D_P
STM32_N STM32_P
GND
R55 1M
J1
R61 4k7
LD62
LD61
R62 4k7
GND GND
3V3
GND
GND
IN OUT
U3 TLV70133
D2 C8
1µF
C9
10µF
Vsrc
Vsrc
GND
T45
R46 3k9
R45
150k
LD12
Vbus Vbus
C5c 1µF
VSel_PDO5 VSel_PDO4
VSel_PDO3
VSel_PDO2
VDD
24
VReg_2V7
23
VReg_1V2
21
VBUS_DISCH 19
VBus_EN_SRC 20
SCL
7
SDA
8
Addr0
13
SEL_PDO2
12
SEL_PDO3
11
SEL_PDO4
14
SEL_PDO5
15
GND
10
CC2 4 CC1 2
VBus_Sense 18
ExpPAD
0
U1A
STUSB4710A
SCL SDA
R51
NC
2V7
GND GND
GND
GND
1V22V7
C6 1µF C7 1µF
R52
100k
J50 CC
GND
D52 ESDA25L
CC1 CC2
HC
GND
T35
STR2P3LLH6
R36 10k
R35
820
R42
22k
R41
47k
T41A
Si4925DD Y
T41B
Si4925DD Y
VBus_EN_SRC
VBus_DISCH
GND
J2-B GND
J2-A Vbus
Power Control
Vbus
USB-Nucleo Interface for I2C Access
5V
Autonomous USB PD controller with integrated discharge path
UM2293
Schematic diagram
UM2293 - Rev 2 page 4/14

3Bill of materials
Table 1. STEVAL-ISC004V1 bill of materials
Item Q.ty Ref. Part/Value Description Manufacturer Order code
1 1 C1 100nF, 50V
±10%
Capacitor X7R
0603 Würth Elektronik 885012206095
2 3 C2, C2',
C51
10µF, 25V
±20% 1206
Capacitor X5R
1206 Würth Elektronik 885012108021
3 1 C3 220nF, 100V
±10% 1206
Capacitor X7R
1206 Würth Elektronik 885012208089
4 1 C4 100pF, 50V
±5%
Capacitor COG
0603 Würth Elektronik 885012006057
5 1 C5a 220µF 35V
±20%
Capacitor Electro
P 3.5mm D 8mm H
11.5mm
Würth Elektronik 860020574012
6 1 C5b 22µF, 25V
±20%
Capacitor X5R
1210 Würth Elektronik 885012109014
7 4
C5c,
C6, C7,
C8
1µF, 50V
±20%
Capacitor X7R
0805 Würth Elektronik 885012207103
8 1 C9 10µF, 16V
±20%
Capacitor X5R
0805 Würth Elektronik 885012107014
9 1 C55 4.7nF, 50V
±10%
Capacitor X7R
0603 Würth Elektronik 885012206087
10 1 C56 1µF, 25V
±20%
Capacitor X5R
0603 Würth Elektronik 885012106022
11 2 D0, D51 22V, Vbr =
24.6
High power
transient voltage
suppressor,
QFN1610
ST ESDA25P35-1U1M
12 1 D1 60 V, 3 A Schottky Diode,
SMT, DO-214AA ST STPS3L60U
13 1 D2 40V, 300mA
Small signal
Schottky diode,
SOD123
ST BAT54ZFILM
14 1 D12 1.6 x 0.8 mm Green LED, 0603 Würth Elektronik 150060VS75000
15 1 D52 25V
Dual Transil Array
For ESD
Protection, SOT
23-3L
ST ESDA25L
16 1 D61 1.6 x 0.8 mm Yellow LED, 0603 Würth Elektronik 150060YS75000
17 1 D62 1.6 x 0.8 mm Red LED, 0603 Würth Elektronik 150060RS75000
18 1 J0 2.5x5.5mm
Right Angle PC
Mount DC Power
Jack, pin size 2.5
Würth Elektronik 694108301002
19 6
J0-A,
J0-B,
J1-A,
J2-A,
J2-B,
J50
1x2, 2.45mm
pitch
2-position
connector; header;
through hole
Würth Elektronik 61300211121
UM2293
Bill of materials
UM2293 - Rev 2 page 5/14

Item Q.ty Ref. Part/Value Description Manufacturer Order code
20 1 J1 2x8, 0.100"
(2.54mm)
16-position
receptacle
connector, through
hole gold
Würth Elektronik 61301621821
21 1 J2 USB 3.1 Type
C
Receptacle
Horizontal THR
WR-COM 1.6mm
PCB thickness,
SMT
Würth Elektronik 632723300011
22 1 J55 USB 2.0 Type
Micro B
SMT Horizontal 5
Contacts Würth Elektronik 629105136821
23 1 L1
68µH, 3.2A,
0.089Ω,
12x12x10mm
Inductor Würth Elektronik 7447709680
24 4
ME-01,
ME-03,
ME-05,
ME-06
M3 and 20mm
Spacer Screw - -
25 1 R2 200K ±1% 0603 SMD resistor - -
26 1 R3 13k ±1% 0603 SMD resistor - -
27 1 R4 4k7 ±1% 0603 SMD resistor - -
28 1 R5 4k87 ±1% 0603 SMD resistor - -
29 1 R6 8k66 ±1% 0603 SMD resistor - -
30 1 R7 33k ±1% 0603 SMD resistor - -
31 3
R33,
R34,
R61
2k2 ±5% 0603 SMD resistor - -
32 1 R35 820 ±5% 0805 SMD resistor - -
33 1 R36 10k ±5% 0603 SMD resistor - -
34 1 R41 47k ±5% 0603 SMD resistor - -
35 1 R42 22k ±5% 0603 SMD resistor - -
36 1 R45 150k ±5% 0603 SMD resistor - -
37 1 R46 3k9 ±5% 0603 SMD resistor - -
38 1 R52 100k ±5% 0603 SMD resistor - -
39 1 R55 1M ±5% 0603 SMD resistor - -
40 1 R62 4k7 ±5% 0603 SMD resistor - -
41 1 RD1 200 ±5% 0603 SMD resistor - -
42 5
SB8,
SB11,
SB15,
SB21,
SB25
0 ±5% 0603 SMD resistor
0R - -
43 1 T35 -30V, 0.048Ω
typ., -2A
P-channel
STripFET™ H6
Power MOSFET,
SOT 23-3L
ST STR2P3LLH6
44 1 T41 30V
Dual P-Channel
(D-S) MOSFET,
SO 8
Vishay Siliconix Si4925DDY
UM2293
Bill of materials
UM2293 - Rev 2 page 6/14

Item Q.ty Ref. Part/Value Description Manufacturer Order code
45 1 T45 60V, 300mA
N-channel Trench
MOSFET, SOT
23-3L
- 2N7002
46 1 U1 -
Autonomous USB
PD controller with
integrated
discharge path in
QFN24 4x4mm
ST STUSB4710AQTR
47 1 U2 3A out,
5.5V-48V in
step-down
switching
regulator, HSOP-8
ST ST1S14PHR
48 1 U3 24V in,
150mA, 3V3
Ultralow IQ Low-
Dropout Regulator,
SOT 23-5L
Texas Instruments TLV70133DBVT
49 1 U55 -
Very low
capacitance ESD
protection, SOT
23-6L
ST USBLC6-2SC6
UM2293
Bill of materials
UM2293 - Rev 2 page 7/14

4Board layout
Figure 5. STEVAL-ISC004V1: top layer
Figure 6. STEVAL-ISC004V1: bottom layer
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Board layout
UM2293 - Rev 2 page 8/14

Figure 7. STEVAL-ISC004V1: top silkscreen
Figure 8. STEVAL-ISC004V1: bottom silkscreen
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Board layout
UM2293 - Rev 2 page 9/14

Figure 9. STEVAL-ISC004V1: top assembly
Figure 10. STEVAL-ISC004V1: bottom assembly
4.1 Layout constraints
As the VBUS path can carry up to 3 A, power track between DC-DC, Power MOS and Type-C connector is large
enough.
Special care must be taken for DC-DC layout and thermal dissipation.
The STUSB4710A monitors VBUS and discharges the path. The monitoring signal should be separated from the
power signal and QFN exposed pad must be connected to global GND plane through vias to allow thermal
conduction.
UM2293
Layout constraints
UM2293 - Rev 2 page 10/14

5Board customization
5.1 Power delivery through STUSB4710A and DC-DC regulator
STUSB4710A advertises the voltage/current couple capability on the CC line (power delivery objects or PDO).
Each object is linked to a VSEL_PDO signal which controls the DC-DC converter.
When a contract is negotiated with the sink device connected to the Type-C connector, the VSEL signal
corresponding to the selected power object is tied low.
The equivalent resistor bridge of the DC-DC controller must be set to match the output voltage with the selected
PDO.
STUSB4710A monitors the VBUS voltage and disconnects the sink device when the voltage is not in the correct
range.
5.2 Software configuration
The STUSB4710A settings are stored in non-volatile memory (NVM), accessible through I²C.
STMicroelectronics provides a graphical user interface for evaluation purposes to program this memory via PC.
The STEVAL-ISC004V1 PDO memory settings must be aligned with the hardware resistor configuration.
Figure 11. STUSB4710A NVM settings
5.3 Hardware configuration
The buck application delivers 5 output voltages by default. The output voltages can be customized by changing
R2, R3, R4, R5, R6 and R7 resistor values.
The STUSB4710A controls the output voltage through 4 GPIOs which change the voltage divider ratio on the
basis of the feedback signal to the buck controller.
According to the voltage tuning, the voltage divider based on R2, R3, R4, R5, R6 and R7 resistors has to be
tuned accordingly.
5.4 Voltage output trimming
The output voltage control is based on the voltage divider variation. Each time a PDO is modified, the set of R3,
R4, R5, R6 and R7 resistors has to be modified accordingly.
Note: R2 is fixed at 200 k for the ST1S14.
Firstly, you have to calculate the resistor associated with the divider ratio for each output voltage:
UM2293
Board customization
UM2293 - Rev 2 page 11/14

RA=
R2∙1.22
VOUT−1.22 =200 ∙1.22 5−1.22 =64550Ω (1)
To limit the error propagation, the resistor computation should start from the highest voltage to the lowest one by
integrating the previous computation at each step.
R3=
R2∙1.22
VOUT−1.22 (2)
R4=
R2∙1.22
VOUT−1.22 − R3(3)
R5=
R2∙1.22
VOUT−1.22 − R3− R4(4)
R6=
R2∙1.22
VOUT−1.22 − R3− R4− R5(5)
R7=
R2∙1.22
VOUT−1.22 − R3− R4− R5− R6(6)
Table 2. STEVAL-ISC004V1 default resistors
Vbus (V)
Theoretical value (Ω)
R=
R2∙1.22
VOUT −1.22
Real resistor value in 1% series
RARBRCRDRER3R4R5R6R7
564550 13k0 4k7 4k87 8k66 33k0
9 31362 13k0 4k7 4k87 8k66
12 22634 13k0 4k7 4k87
15 17707 13k0 4k7
20 12992 13k0
UM2293
Voltage output trimming
UM2293 - Rev 2 page 12/14

Revision history
Table 3. Document revision history
Date Version Changes
03-Oct-2017 1 Initial release.
13-May-2019 2 Updated Section 3 Bill of materials
Formatting updates throughout document
UM2293
UM2293 - Rev 2 page 13/14

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UM2293 - Rev 2 page 14/14