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USB Power switch demonstrator kit

User Manual

Format: (350 kb)

Last Updated: 24/08/2007

Pages: 17

Related Data Briefs

USB power switch demonstration board

Related Datasheets

CURRENT LIMITED POWER DISTRIBUTION SWITCHES

Current limited, Power distribution switches

Enhanced power switch

ST7262 - LOW SPEED USB 8-BIT MCU WITH 3 ENDPOINTS, FLASH OR ROM MEMORY, LVD, WDG, 10-BIT ADC, 2 TIMERS, SCI, SPI

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UM0242 User manual
USB Power Switch demonstrator kit
Introduction
The objective of this demonstrator is to display to the user the features and capabilities of the USB Power switches (ST204x and ST205x) developed by STMicroelectronics using a Windows -based 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 specially for demonstration board applications . The demonstration board incorporates microcontroller, programmable voltage regulator, Mosfets, switches and various resistive networks. The onboard 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 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 12V charge pump is also provided on the board to allow the user to perform InApplication 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.

May 2006

Rev 1

1/17
www.st.com

Contents

UM0242

Contents
1 Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 1.2 1.3 1.4 System requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Package contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Software installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Hardware installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2

Running the USB power switch kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 2.2 2.3 2.4 2.5 2.6 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 USBPS GUI description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Communication with the demonstration board . . . . . . . . . . . . . . . . . . . . . 11 Programming the MCU Flash memory . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Plugging of real load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Demonstration board schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3 4

Bill of materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

2/17

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List of figures

List of figures
Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. Power switch board layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Enumeration result . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 USBPS_GUI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Device database window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Sampling information window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Calibration Values window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Board schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

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List of tables

UM0242

List of tables
Table 1. Table 2. Table 3. Table 4. Jumper settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Switches configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 LEDs configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Bill of materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

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UM0242

Getting started

1
1.1

Getting started
System requirements
In order to use the USB Power Switch Demonstrator with the Windows operating system, a recent version of Windows, such as Windows 98, Windows 2000 or Windows XP must be installed on the PC. The version of the Windows OS installed on your PC may be determined by clicking on the "System" icon in the Control Panel.

1.2

Package contents
The USB Evaluation Kit includes the following items:

Hardware content One USB Power Switch demonstration board PC executable software (USBPS_GUI) for using the demonstration board PC executable software (DFUGUI) for upgrading firmware through USB using DFU feature. ST7 firmware (C source code) for the ST72F62. User Manual for using the Power Switch demonstrator kit. ST7262 Datasheet. USB power switches datasheets. Usage document for using DFUGUI. Software content

Documentation

1.3

Software installation
Run the setup file to install USBPS_GUI and follow the on-screen prompts to complete the installation.

1.4

Hardware installation
Figure 1 shows a photograph of the demonstration board with all the components usable on this board. The schematic of the demonstration board is given in Figure 7.

5/17

Getting started Figure 1. Power switch board layout

UM0242

Charge Pump

ICC Connector

Regulator

Microcontroller

Power Switch MOSFETs

Loads CON2 CON3

1.4.1

Power supply
The microcontroller is directly powered by the USB Connector (bus-powered). While the rest of the circuit needs a 10V/3A supply which has to be plugged in the connectors of the board after inserting the USB cable.

6/17

UM0242

Running the USB power switch kit

2
2.1

Running the USB power switch kit
Introduction
This USB Power Switch kit consists of two main parts: an USBPS_GUI running on PC and a Demonstration board. Communications between the PC and the ST7 board are done through different USB pipes: Figure 2. Control IN and OUT during the enumeration with the bi-directional endpoint 0 Interrupt IN from endpoint 1 for data transferred from ST7 to PC. Interrupt OUT to the endpoint 2 for the data transferred from PC to ST7. Enumeration result

By starting the USBPS_GUI on the PC, you get a graphical interface (Figure 3) for controlling the demonstration board. This PC software is used to issue various commands and to control data transfers between the PC and the ST7 peripheral.

2.2
2.2.1

USBPS GUI description
Main window
The USBPS GUI enables the user to configure the parameters shown in Figure 3.

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Running the USB power switch kit Figure 3. USBPS_GUI

UM0242

Input parameters

Device Select: Click the drop-down menu to select the correct board from the list of available devices. Load current: Select the correct load to apply at the switch output: 100mA, 500mA, 1A or 2A. Larger loads can be applied by changing the load resistance R37 with the required load on the demonstration board. Input voltage: Select the correct input voltage for the switch: 4.4V, 4.75, 5.0V or 5.25V. Under Voltage: Select the under voltage protection. When ON, a 1.2V supply is applied at the switch input. At this input supply level, the Power Switch output will be zero, displaying the cut off capability of the Power Switch at low input voltages. Shor t Circuit: Select ON to enable a short-circuit at the Power Switch output. A graph of short circuit current versus time will be plotted in a separate window. Power Switch: Select Enable or Disable option on the GUI to control the voltage on the Enable pin of the Power Switch. Plot Reaction: Select Turn ON/OFF to display in a separate window the plotting of a graph of the output rise time and fall time, respectively, of the Power Switch.

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UM0242

Running the USB power switch kit

Output parameters

Input Voltage, Output Voltage and Load Current windows display the current parameter settings. Over Current: This LED is ON when a current larger than device rating is flowing through the device.

Device status

Connected: This LED is ON when an HID device is connected to the Power Supply board via a USB cable.

2.2.2

Device Database window
The Device Database window (Figure 4) enables the user to register a new pin-compatible power switch device by entering the device name, maximum current range, short-circuit current and Enable signal polarity parameters. Figure 4. Device database window

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Running the USB power switch kit

UM0242

2.2.3

Sampling Information window
The Sampling Information window (Figure 5) enables the user to update the sampling time and number of samples parameters for short-circuits and to enable the display of graphs separately. Figure 5. Sampling information window

2.2.4

Calibration Values window
The Calibration Values window (Figure 6) is used for changing the multiplication factors used for calibrating the ADC values. Figure 6. Calibration Values window

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UM0242

Running the USB power switch kit

2.3
2.3.1

Communication with the demonstration board
PC software control of the demonstration board
To use the USBPS GUI, select a particular device (i.e. Power Switch as on the demonstration board) from Device Select drop box. Selection of an incorrect Power Switch will lead to incorrect results.

Note:

If the correct device is not listed in the drop box, enter the required information in the Device Database window as described in Section 2.2.2: Device Database window. Use the various parameters described in Section 2.2: USBPS GUI description to look into the features of the USB Power Switch.

2.3.2

Manual control of the demonstration board
This Power Switch Demonstration board can also work without the PC software. Different voltages and loads can be selected using switch S2 & S3 respectively. Pressing S3 again and again will increment the voltage in the above mentioned steps and after 5.25V under voltage (i.e. 1.2V) is selected. After under voltage the next state is 4.4V. Similarly load at the output can be varied using S2. In default state of the board, 5V is present at Power Switch input and 100 mA load at the output.

2.3.3

Display of demonstration board state
Real time values of input voltage, output voltage of the Power Switch and its load current are incremented every second in the GUI display window. In case of over current through the switch, indication will be given on the GUI through over current LED.

2.4
2.4.1

Programming the MCU Flash memory
Programming through ICC
To program the MCU through ICC, plug in the ICC cable and put jumper JP4 in 2-3 position as described in Table 1. In the firmware two S19 files are available one for sector0 (0xF0000xFFFF) and other for Sectors 1 and 2 (0xC000-0xEFFF). Program these files in the respective sectors. The board has been tested with the INDART kit.

2.4.2

Upgrading firmware through DFU
Device firmware upgrade (DFU) is used to reprogram Sectors 1 and 2 through USB cable without reprogramming Sector 0. Use the DFUGUI to upgrade Sectors 1 and 2. Refer to help manual of ST7 DFUGUI for a complete description.

2.4.3

Entering DFU mode
Press and hold the switch S3 and reset the board (by pressing S1). The board will now go into DFU mode. Now, Sectors 1 an 2 can be upgraded. To exit DFU mode, reset the board.

11/17

Running the USB power switch kit Table 1.
Jumper No.

UM0242

Jumper settings
Jumper Location Connector between o/p of power switch and load. Jumper Setting This jumper should always be present on the board during normal operation. If reading of load current with multimeter is desired then only, jumper should be removed and ammeter should be inserted.

JP1

JP2

Connector between adjust This jumper should not be present on the board else it pin of regulator and ground. will cause undervoltage situation. It is kept for future. Connector between ICCLK This jumper is useful only in ICC mode. Don't put this pin and OSC1 pin of jumper ON if the crystal is present. microcontroller Connetor Between 12V input and Vpp pin of the microcontroller. It's a 3 pin jumper and useful in ICC and DFU mode. Short its 2-3 pins in ICC mode and 1-2 pins in DFU mode. Through this jumper 12V is supplied to the Vpp pin of the MCU.

JP3

JP4

Table 2.

Switches configuration
Switch No. SW1 SW2 SW3 Reset Load Switching Input voltage switching & entry in DFU mode Switch Use

Table 3.

LEDs configuration
LED Color Red Green Green Green Green Red Yellow Yellow Yellow Yellow Glowing Condition Over Current through Power Switch Presence of 4.4V at Power Switch input. Presence of 4.75V at Power Switch input. Presence of 5.0V at Power Switch input. Presence of 5.25V at Power Switch input. Under Voltage Condition 400mA Load LED 600mA Load LED 100mA Load LED 2A Load LED

LED No LED1 LED2 LED3 LED4 LED5 LED6 LED7 LED8 LED9 LED10

2.5

Plugging of real load
Any type of USB real load can be powered from this board. First plug the USB cable into connector CON2 then plug the load into connector CON3.

12/17

2.6

UM0242

1 6

2

3

4

5

Figure 7.

CON1

C1

USB Power Switch
R16 LD1 R18

VCC 10k
R21
AIN4

1 2 3 4

USBVDD USBDM USBDP VSSA

4.7uF/25V IN4148
R1 U1

C14

POWER SWITCH DEMO
D1 12V
X1

10k
AIN3

100nF 1.5k LM317T
U2 R17
AIN2 VOUT

330E
R19

D 2 Vin Adjust
R13 R14

USB-B-TYPE TO PC Vout 470E
C3
AIN5

D 10k
R31

3 10k
C4

R5

47k 10k

CON2

PD2 PD3 PD4 PD5 40 39 VDDA USBVCC USBDP USBDM VSSA

VCC12V
X2 C2

1E/5W 1 2 JP1

44 43 42 41 40 39 38 37 36 35 34

VCC
C6

GND 10uF/25V 10uF/25V
R15

1 2 3 4 10nF 1 10uF
R4 R3 S2 S1

USBVDD2 USBDM-2 USBDP-2 VSSA

USB-B-TYPE TO PC 47k GND ST20XX
S3

44 43 42 41 40 39 38 37 36 35 34

U2-1 U2-2 U2-3 U2-4 U2-5 U2-6 U2-7 U2-8

1 2 3 4 5 6 7 8 GNDA OC1 IN1 OUT1 EN1 OUT2 EN2 OC2 GNDB OC3 IN2 OUT3 EN3 OUT4 EN4 OC4
U2-16 U2-15 U2-14 U2-13 U2-12 U2-11 U2-10 U2-9

16 15 14 13 12 11 10 9

D2 IN4148 10k

47k
R32A
VR5

CON3 U3

R36

18k JP2 2 1
R32 R34 R35

1k5

10k

1k

1 2 3 4 ST7262
R33 R34A R35A C5

VOUT USBDM-2 USBDP-2 VSSA

R53

AIN6

10uF/25V

0.1E/5W
R52

10k

10k

Board schematic

USB-A-TYPE TO LOAD 4.7k
VR1 VR3 VR4

C7

VPP PD1 PD0 4 V1 V2 V3 V4 V5 OSC1 OSC2

1 2 3 4 5 6 7 8 9 10 11 33 32 31 30 29 28 27 26 25 24 23 0
U4
VR1 RESET 32 31 AIN2 AIN3 AIN4 AIN5 AIN6 25 PB0 RDI

12 13 14 15 16 17 18 19 20 21 22

33pF
R11
PD2

Y1

1 2 3 4 5 6 7 8 9 10 11 5.1k

33 32 31 30 29 28 27 26 25 24 23

Switching Circuit
VCC
GND

C
4

12 13 14 15 16 17 18 19 20 21 22

C8 R6

12MHz 47k
R43
PD3

47k 47k

1 2 3 4

33pF
14 16 25 GND GND

R7

47k J1 J4 47k 47k
R44
PD1

S1 G1 S2 G2

D1 D1 D2 D2 STS8DNH3LL
U5

8 7 6 5

R51

GND

C 47k

VCC R2

VSS USBVDD 14 U 2- 3 16 17 ICCDATA ICCCLK PB4 PB3 TDO

R8 R9 R10

47k 47k
R45

VR3 VR4

VCC
40

47k
PD0

VCC

1 2 3 4 47k

S1 G1 S2 G2

D1 D1 D2 D2 STS8DNH3LL
U6

8 7 6 5

R22

V1

Demonstration board schematic

330E

LD2

USBVDD VDDA VSS VSSA GND ICCDATA PB6 ICCCLK PB5

VPP PD1 PD0 4 V1 V2 V3 V4 V5 OSC1 OSC2

R23

V2

1 2 3 4 5 6 7 8 9 10 11 CON11 J2 J3 CON11
GND GND

PD2 PD3 PD4 PD5 40 39 VDDA USBVCC USBDP USBDM VSSA

11 10 9 8 7 6 5 4 3 2 1
R46 R47
PD4

VR5

330E
CON4 JP3

LD3

ICC
2 1 GND VCC 10k HEADER 5X2
R20
ICCDATA ICCCLK RESET VPP_ICC

R24

47k
PB5

V3

1 2 3 4 47k

330E

LD4

S1 G1 S2 G2

D1 D1 D2 D2 STS8DNH3LL
U7

8 7 6 5

R25

V4

330E

LD5

R38

OSC1

B

R26

V5

1 3 5 7 9

2 4 6 8 10

330E

LD6

VCC
GND

R12 R48

50E/2W
PB6

R28

47k
PB4

LD9 R39

B 330E 47k 10E/5W STS8DNH3LL
U8
GND GND

1 2 3 4

S1 G1 S2 G2

D1 D1 D2 D2

8 7 6 5

R29 LD7 R49 R50
PB0

VSS VCC 14 U2-3 16 17 ICCDATA ICCCLK PB4 PB3 TDO

JP4 CON11 1 2 3

1 2 3 4 5 6 7 8 9 10 11 CON11

RESET 32 31 AIN2 AIN3 AIN4 AIN5 AIN6 25 PB0 RDI

11 10 9 8 7 6 5 4 3 2 1

330E
R40

47k
PB3

5E/5W
R27

Charge-pump Circuit
VPP_ICC VPP

1 2 3 4 J6 47k

J5

S1 G1 S2 G2

D1 D1 D2 D2 STS8DNH3LL

8 7 6 5
LD8

330E
R37

U9

1E/5W
R30 LD10

C9 220nF

1 2 3 4 C13 100nF C12 4.7uF

C10 220nF

C1C1+ C2C2+

SHDN GND Vout VCC

8 7 6 5

330E Deepu Arora STMicroelectronics

ST662A C11 4.7uF Q1 VCC

U2-1 U2-2 U2-3 U2-4 U2-5 U2-6 U2-7 U2-8

1 2 3 4 5 6 7 8 CON8

U2-16 U2-15 U2-14 U2-13 U2-12 U2-11 U2-10 U2-9

8 7 6 5 4 3 2 1 CON8

USB_DEMO_SWITCH R42 10k HS1 A

A BC557 R41 2k2

HEATSINK

PD5

Size B Scale

FCSM No.

DWG No.

Rev 1 Sheet 0 of 0 3 4 5 6

Running the USB power switch kit

13/17
2

1

Bill of materials

UM0242

3
Table 4.

Bill of materials
Bill of materials
Value/Generic part number 1.5K Manifacturer`s ordering Manufacturer code/orderable part number Any

Index

Qty

Reference

Package

1

1

R1 R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R43, R44, R45, R46, R47, R48, R49, R50, R51 R13 R14, R15, R16, R17, R18, R19, R20, R42, R52, R53, R34A R21, R22, R23, R24, R25, R26, R27, R28, R29, R30 R35A R33 R32 R35 R32A R34 R41 R36 R31, R37 R40 R39 R38 C1, C11, C12 C2, C3, C4, C5 C6 C7, C8 C9, C10 C13, C14 LD2, LD3, LD4, LD5

SMD 0805

2

20

47K

SMD 0805

Any

3 4

1 11

470E 10K

SMD 0805 SMD 0805

Any Any

5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

10 1 1 1 1 1 1 1 1 2 1 1 1 3 4 1 2 2 2 4

330E 1K 1K5 4K7 5K1 18K 0E 2K2 0.1E, 5W 1E, 5W 5E ,5W 10E, 5W 50E, 2 W 4.7uF, 25V 10uF, 25V 10nF 33pF 220nF 100nF

SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 Leaded Leaded Leaded Leaded Leaded RB-.2/.4 RB-.2/.4 SMD 0805 SMD 0805 Leaded SMD 0805 Thru Hole LED 3mm -Green

Any Any Any Any Any Any Any Any RS Components Any Any Any Any Any Any Any Any Any Any Any RS199-6378

14/17

UM0242 Table 4. Bill of materials (continued)
Value/Generic part number

Bill of materials

Index

Qty

Reference

Package

Manifacturer`s ordering Manufacturer code/orderable part number Any Any ST LM238K ST2042BDR, or ST2044BDR, or ST2052BDR, or ST2054BDR ST72F621J4T1 STS8DNH3LL ST662ABD-TR

25 26 27

4 2 1

LD7, LD8 ,LD9, LD10 LD1, LD6 U1 LM238 ST2042BDR, or ST2044BDR, or ST2052BDR, or ST2054BDR ST72F621J4 STS8DNH3LL ST662A

Thru Hole LED 3mm -Yellow Thru Hole LED 3mm -Red TO-3

28

1

U2

SO-8 or SO-16 ST

29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44

1 5 1 1 2 3 2 1 1 1 1 1 1 4 2 3

U3 U4, U5, U6, U7, U8 U9 Q1 D1, D2 S1, S2, S3 CON1, CON2 CON3 CON4 Y1 HS1 X1 X2 J1, J2, J3, J4 J5, J6 JP1, JP2, JP3

TQFP-44 SO-8 SO-8

ST ST ST Any Any Any Kycon Kycon Any Any Any FARNELL FARNELL Any Any Any

BC557 or BC558 TO-92A IN4148 DO-35 Push Button USB-B-TYPE USB-A-TYPE HEADER 5X2 12MHz Crystal Heat Sink VCC12V GND CON11 CON8 CON2 USB-B USB-A IDC-10B XTAL-3 HS-TO3 RS738-547 RS738-547 SIP-11 SIP-8 SIP-2

KUSB-BS-1-N-BLK KUSB-AS-1-N-BLK

150-039 150-040

15/17

Revision history

UM0242

4

Revision history
Revision history
Date 19-May-2006 Revision 1 Initial release. Changes

16/17

UM0242

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Document Number: 12288



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