USB power switch demonstration board
Features
■ Input parameters:
– Load current: 100 mA, 500 mA, 1 A or 2 A.
Larger loads can be applied by properly
changing the load resistance (R37)
– Input voltage: 4.4 V, 4.75 V, 5.0 V or 5.25 V
– Under-voltage protection
– Power switch: enable or disable option on
the GUI to control the voltage on the enable
pin of the power switch
■ Output parameters:
– PC executable software (USBPS_GUI) for
use with the demonstration board
– PC executable software (DFUGUI) for
upgrading the firmware by USB using the
DFU feature
– ST7 firmware (C source code) for the
ST72F62 microcontroller
Description
The purpose of this board is to demonstrate the
features and capabilities of the ST204x and
ST205x USB power switches developed by
STMicroelectronics, using a Windows
host software application and one of several USB
low-speed microcontrollers from ST acting as a
peripheral device. The host software and the ST7
source code provides a clear picture of the power
switch capabilities. The USB communication
between host and the device is done through a
HID class based protocol developed specifically
for demonstration board applications. The
demonstration board incorporates a
microcontroller, programmable voltage regulator,
MOSFETS, switches and various resistive
networks. The on-board regulator can be
configured to supply various voltages by selecting
appropriate resistance from the resistive network
present at the adjust pin of the regulator. Different
voltages and loads can be selected from the PC
®
-based
STEVAL-PCN001V1
Data Brief
STEVAL-PCN001V1
software, as well as through switches present on
the board. LEDs are provided on the board to
indicate the various combinations of input voltage
and load applied to the power switch. The board
has an ICC connector to program the
microcontroller Flash memory. An external 12 V
charge pump is also provided on the board to
allow the user to perform in-application
programming (IAP) of the microcontroller
embedded Flash program memory. Any type of
real load (e.g. USB speakers) can be powered
from this board by plugging in the connector
present on the board
September 2008 Rev 1 1/4
For further information contact your local STMicroelectronics sales office.
www.st.com
4
Board schematic STEVAL-PCN001V1
I
N
2
6
E
N
3
7
E
N
4
8
O
C
4
9
3
4
5
6
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8
4
7
8
J
5
C
O
N
8
1 Board schematic
Figure 1. Schematic diagram
R19
10k
R18
10k
R31
1E/5W
AIN4 AIN3
R17
10k
R16
10k
VCC
R21
330E
47k
VOUT
R5
LD1
AIN2
U2-16
U2-15
U2-13
U2-14
14
16
15
OC1
OUT1
OUT2
EN1
IN1
GNDA
U2
2
1
3
USB Power Switch
U2-3
U2-1
U2-2
U2-4
R14
10k
R13
470E
R36
0.1E/5W
2
1
C4
10uF
U2-12
U2-11
13
12
11
OC2
OC3
EN2
GNDB
5
6
4
U2-5
U2-6
C3
R52
JP1
U2-10
U2-9
10
OUT3
OUT4
3
2
N
N
E
I
7
U2-7
U2-8
AIN5
R15
10uF/25V
10k
AIN6
R53
10k
9
4
C
O
4
N
E
ST20XX
8
10k
VR5
JP2
C5
10uF/25V
GND
VR1
8
U4
1
VR3
VR4
R51
47k
7
5
6
D1
D1
D2
D2
G2
G1
S2
S1
U5
STS8DNH3LL
4
3
2
VR5
8
1
8
5
7
6
D1
S1
D1
D1
D2
D2
S1
G2
S2
G1
U6
STS8DNH3LL
1
4
3
2
Swi tching Circuit
PD2
PD3
PD1
47k
R11
R43
VCC
1
2
GND
PD0
47k
47k
47k
R44
GND
R46
R45
GND
GND
3
IN4148
D2
R35A
Vout
Adjust
IN4148
D1
Vin
U1
LM317T
2
12V
GND
X1
VCC12V
X2
1k
R34A
10k
1
R33
1k5
R32A
18k
C2
10uF/25V
GND
S2
S3
VR4
R35
5.1k
VR3
R34
0
R32
4.7k
11
9
10
8
7
6
4
5
2
3
PD5
40
4
V1V2V3V4V5
4
1
39
USBVCC
VDDA
USBDP
VSSA
USBDM
11
8910
7
5
6
OSC1
OSC2
J4
VR1
PD2
PD4
PD3
3
1
2
J1
PD0
PD1
VPP
R28
330E
R29
330E
R30
330E
330E
R27
R38
50E/2W
R39
10E/5W
R40
5E/5W
1E/5W
R37
LD9
8
6
7
D1
G1
2
3
PD4
47k
R47
CON11
CON11
6
5
D17D1
D2
D2
G1
S1
G2
S2
U7
STS8DNH3LL
2
3
1
4
PB6
PB5
47k
47k
R12
R48
VCC
GND
GND
5
6
7
8
9
10
11
J3
AIN5
RESET
AIN4
AIN3
32
31
AIN2
1
2
3
4
5
6
7
J2
16
17
14
VSS
VCC
U2-3
ICCDATA
LD8
LD7
5
D2
D2
G2
S2
STS8DNH3LL
U8
4
PB4
47k
1
2
3
4
PB0
RDI
25
AIN6
8
10
11
9
PB4
PB3
TDO
ICCCLK
LD10
5
6
7
8
D2
D2
D1
D1
S1
G1
S2
G2
STS8DNH3LL
1
2
3
4
PB0
PB3
47k
47k
R50
R49
GND
GND
1
2
3
4
5
6
7
8
J6
CON11
U2-16
U2-15
1
5
CON11
J
U2-1
U2-2
U2-14
22334
U2-3
CON8
U2-13
U2-12
U2-11
U2-10
U2-9
8
N
8
55667
O
C
HS1
U2-4
U2-5
U2-6
U2-7
U2-8
HEATSINK
47k
R4
47k
VCC
R3
47k
10nF
S1
C6
AIN3
AIN4
AIN5
AIN2
RESET
32
31
29
31
28
27
32
33
30
32
33
30
31
28
29
34
VSSA
34
35
USBDM
35
36
USBDP
36
R1
1.5k
C14
100nF
C1
4.7uF/25V
USBDM
VSSA
USBDP
USBVDD
4
1
2
3
CON1
USB-B-TYPE
TO PC
37
USBVCC
37
38
VDDA
38
39
39
39
40
40
40
41
41
PD5
PD4
PD3
43
PD2
44
VSSA
USBVDD2
USBDP-2
USBDM-2
1
2
3
CON2
42
U3
ST7262
42
43
44
1
2
3
4
5
6
7
4
5
1
6
2
3
V1V2V3V4V5
PD1
PD0
VPP
4
VSSA
VOUT
USBDP-2
USBDM-2
1
2
3
4
4
CON3
USB-B-TYPE
TO PC
47k
R7
R6
414162540
PB0
RDI
AIN6
25
23
25
26
24
26
27
23
24
25
22
22
21
21
20
20
19
19
18
18
17
17
16
16
15
15
14
14
13
13
12
7
12
8
9
10
11
8
9
10
11
OSC1
OSC2
Y1
12MHz
C7
33pF
C8
USB-A-TYPE
TO LOAD
2/4
47k
47k
47k
R8
R9
R10
TDO
PB3
PB4
ICCCLK
ICCDATA
PB5
17
16
U2-3
14
VSS
PB6
VDDA
USBVDD
47k
ICCDATA
ICCCLK
VSS GNDVSSA
USBVDD VCC
R2
VCC
V1
33pF
R22
330E
VCC
R20
10k
ICCDATA
ICCCLK
RESET
VPP_ICC
2
4
6
8
10
1
3
5
7
9
ICC
CON4
HEADER 5X2
VCC
GND
JP3
1
2
OSC1
V2
V3
V4
V5
LD3
LD4
LD5
LD2
R23
330E
LD6
R24
330E
R25
330E
R26
330E
VPP
3
VPP_ICC
2
1
JP4
8
Charge-pump Circuit
U9
1
C9
VCC
R42
10k
BC557
Q1
R41
C12
4.7uF
C13
100nF
4.7uF
C11
5
6
7
VCC
Vout
GND
SHDN
ST662A
C1-
C1+
C2-
C2+
2
3
4
220nF
C10
220nF
2k2
PD5
STEVAL-PCN001V1 Revision history
2 Revision history
Table 1. Document revision history
Date Revision Changes
01-Sep-2008 1 Initial release.
3/4
STEVAL-PCN001V1
y
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