Silicon Laboratories CP2112-EK Manual de usuario

CP2112-EK

CP2112 EVALUATION KIT USER’SGUIDE

1. Kit Contents

The CP2112 Evaluation Kit contains the following items:

CP2112 Evaluation Board

CP2112 Product Information CD-ROM. CD contents include:

Example Windows and Mac Applications

Documentation:

CP2112 Data Sheet

CP2112 Evaluation Kit User's Guide

AN495: CP2112 Interface Specification

AN496: CP2112 HID USB-to-SMBus API Specification

USB Cable

2. Software Setup

The included CD-ROM contains the example applications for PC®and Mac®and additional documentation. Insert

the CD-ROM into a system’s CD-ROM drive. If using a Windows PC, an installer will automatically launch, allowing

you to install the software or read documentation by clicking buttons on the Installation Panel. If the installer does

not automatically start when you insert the CD-ROM, run autorun.exe found in the root directory of the CD-ROM.

Refer to the ReleaseNotes CP211x CD.txt file on the CD-ROM for the latest information regarding versions and

known problems and restrictions. If a non-Windows PC is used, manually browse to the directory on the CD-ROM

that contains drivers for your OS. The instructions in this document assume that a Windows PC is being used.

3. CP2112 Hardware Interface

Connect the CP2112 evaluation board to a PC as shown in Figure 1.

1. Connect one end of the USB cable to a USB Port on the PC.

2. Connect the other end of the USB cable to the USB connector on the CP2112 evaluation board.

3. Connect the SDA, SCL, and Ground pins on the CP2112 to an SMBus device. External pull-up resistors

are not needed if the pull-up resistors on the CP2112 evaluation board are used.

Figure 1. Hardware Setup

CP2112 Eval

Board

USB

Cable

USB Port

USB SMBus

Device

CP2112 SDA

SCL SDA

SCL

GND GND

CP2112-EK

2 Rev. 0.2

4. CP2112 Windows Application

The HIDSMBus Example application uses the Windows CP2112 HID-to-SMBus DLL to transmit and receive data

with the CP2112. The application also has access to the CP2112’s GPIO pins. The HIDSMBus Example

application is installed as part of the CD installation process. Figure 2 shows a screenshot of the Windows

Application. The following steps describe how to start the application and use some of its features.

1. Ensure that the hardware is connected to a Windows PC as shown in Figure 1. If the device is properly

connected, the red SUSPEND LED on the CP2112 evaluation board will turn on.

2. Launch the HidSmbus Example application, which is found by clicking

StartAll ProgramsSilicon LaboratoriesCP2112 Evaluation KitHidSmbus Example.

3. In this application, you can configure the SMBus settings and GPIO pins, customize the device

descriptors, and read/write data over the SMBus interface.

4. Select the appropriate device in the “Connection” drop down box and click Connect. After connecting to the

device, you can configure the CP2112.

5. Figure 2 shows the Configuration tab, which allows you to get and set the SMBus configuration

parameters. To set a parameter, modify the value that is in the corresponding text box or check/uncheck a

box and click “Set SMBus Config”. To verify that the settings took place, click “Get SMBus Config”. These

configuration parameters reset to their default values when the CP2112 is reset.

Figure 2. Configuration Tab

CP2112-EK

Rev. 0.2 3

6. Figure 3 shows the Data Transfer tab, which allows you to transfer read and write data over the SMBus.

7. To Read data from an SMBus device (non-addressed mode):

a. Enter the slave address in the “Read Request” box and the number of bytes to read. After this, click “Read Request”

(shown in red).

b. To see the number of bytes that were read back, click “Get Read/Write Transfer Status”, and verify the number of

bytes read at the bottom of the application (show in blue).

c. Next, click “Force Read Response” and then “Get Read Response” until you have read back the total number of

bytes. The bytes will be shown in the “Received Data” field. The status of the CP2112 will be shown a the bottom of

the PC app (shown in blue).

8. To read data from an EEPROM or similar device (addressed mode):

a. Enter the slave address in the “Addressed Read Request” box, the number of address bytes in the target address,

the target address of the SMBus device being read (in hex), and the number of bytes to read. After this, click

“Address Read Request” (shown in green).

b. To see the number of bytes that were read back, click Get Read/Write Transfer Status and verify the number of

bytes read at the bottom of the application (show in blue).

c. Next, click “Force Read Response” and then “Get Read Response” until you have read back the total number of

bytes. The bytes will be shown in the “Received Data” field. The status of the CP2112 will be shown a the bottom of

the PC app (shown in blue).

9. To write data over the SMBus interface:

a. Enter the Slave address in the “Write Request” box and data (in hex) in the “Data to Write” box. After this, click

“Write Request” (shown in purple).

b. Next, click Get Read/Write Transfer Status, and verify that the transfer was complete at the bottom of the application

(shown in blue).

Figure 3. Data Transfer Tab

CP2112-EK

4 Rev. 0.2

10. Figure 4 shows the Pin Configuration tab, which allows you to configure the GPIO and Special Functions

(TX Toggle, RX Toggle, and Clock Output).

a. GPIO pins toggle between Input/Ouput and Open-Drain/Push-Pull by clicking the corresponding GPIO boxes in the

“GPIO Configuration” section. The boxes for TX Toggle, RX Toggle, and Clock Output can be checked to enable the

Special Functionality. The “Set GPIO Config” button must be clicked in order for the settings to change.

b. The “Latch Values” section allows for the GPIO latches to be read or written to. Clicking the box next the GPIO pins

listed will scroll through “1”, “0”, and “X”. Write Latch must be clicked to change the state of the GPIO latch.

Figure 4. Pin Configuration Tab

CP2112-EK

Rev. 0.2 5

11. Figure 5 shows the Customization tab, which allows you to program the One-Time-Programmable (OTP)

parameters of the device. The parameters that are programmed with this tab can only be programmed

once and cannot be changed back to their default values after being programmed. This tab has the same

functionality as the CP2112SetIDs application in the software in “AN144: CP210x/CP211x Device

Customization Guide”. In order for these parameters to be sucessfully programmed, there must be a

4.7 µF capacitor connected between the VPP pin and ground. The CP2112-EK board has this capacitor.

See "6. Schematic" on page 8 for more details on the evaulation board schematic.

a. The “USB Customization” section allows you to program USB parameters. To get the current settings, click “Get”. To

modify the parameters, change the settings by modifying the text boxes and checking the box next to the parameter

being modified. After this, click “Set”. Without checking the corresponding box, the parameter will not be changed.

Perform a “Get” after changing any parameters to ensure that the settings were changed.

b. The “String Descriptors” section allows you to program the serial strings of the CP2112. To modify these, type a

string into the corresponding text box and click “Set”. Perform a “Get” after changing any parameters to ensure that

the settings were changed.

c. The “Lock Byte” section shows which fields have been programmed and allows you to lock fields from being

modified. Any field that has been programmed will not be checked. To prevent a field from being programmed,

uncheck the corresponding box and then click “Set”. Perform a “Get” after changing any parameters to ensure that

the settings were changed.

Figure 5. Customization Tab

CP2112-EK

6 Rev. 0.2

5. Target Board

The CP2112 Evaluation Kit includes an evaluation board with a CP2112 device pre-installed for evaluation and

preliminary software development. Numerous input/output (I/O) connections are provided to facilitate prototyping

using the evaluation board. Refer to Figure 6 for the locations of the various I/O connectors. Refer to Figure 7,

“CP2112 Evaluation Board Schematic” for information regarding the SMBus pull-up resistors that are located on

the target board.

P1 USB connector for USB interface

H1 Access Connector for SMBus interface (SDA, SCL, GND, Pull-Up Voltage)

J1, J2, J3, J4 GPIO access connectors

J6 Power connector

J7 SMBus pull-up voltage connector

J8 Red SUSPEND LED connector

DS0–DS7 Green GPIO LEDs

DS8 Red SUSPEND LED

TB1 SMBus interface terminal block

Figure 6. CP2112 Evaluation Board with Default Shorting Blocks Installed

5.1. LED Headers (J1, J2, J3, J4)

Connectors J1, J2, J3, and J4 are provided to allow access to the GPIO pins on the CP2112. Place shorting blocks

on J1, J2, J3, and J4 to connect the GPIO pins to the eight green LEDs, DS0–DS7. These LEDs can be used to

indicate active communications through the CP2112. Table 1 lists the LED corresponding to each header position.

Table 1. J2 and J3 LED Locations

LED Pins

DS0 J1[3:4]

DS1 J1[1:2]

DS2 J2[3:4]

DS3 J2[1:2]

DS4 J3[3:4]

DS5 J3[1:2]

DS6 J4[3:4]

DS7 J4[1:2]

GND

SDA

SCL

EXT_PU

H1 GND

EXT_PU

DS7

DS6

DS5

DS4

DS3

DS2

DS1

DS0

CP2112

SILICON LABS

www.silabs.com

CP2112-EK J7 J6

SMBUS PU_V

EXT_PU

VIO

VDD

+3V

NET A

TB1 DS8

SUSPEND

CP2112-EK

Rev. 0.2 7

5.2. Universal Serial Bus (USB) Interface (P1)

A Universal Serial Bus (USB) connector (P1) is provided to facilitate connections to the USB interface on the

CP2112. See Table 2 for the USB pin definitions.

5.3. SMBus Signals (TB1, H1)

The SMBus interface terminal block and access headers are included to easily interace SMBus devices to the

evaluation board. The terminal block can be used to connect wires to the board, and the access connectors can be

used to connect scope probes to the SMBus interface for debugging. The signals that are accessible through these

two connectors are SDA, SCL, GND, and the external pull-up voltage signal.

5.4. VDD and VIO Power Connector (J6)

This header (J6) is included on the evaluation board to provide several power options. The following describes the

function of each pin:

Pins 1–2: Connect CP2112 VIO input (pin 5) to CP2112 VDD (Pin 6). Remove the shorting block to power VIO

from an external source.

Pins 3–4: Connects the main +3 V net to the CP2112 VDD (Pin 6). The main +3 V net powers the other

components (eight green LEDs) on the board.

5.5. SMBus Pull-Up Voltage Connector (J7)

This header (J7) is included on the evaluation board to provide power options for SMBus pull-up voltage. The

following describes the function of each pin:

J7[1:2]: Connects CP2112 VIO pin (Pin 5) to the 4.7 kpull-up resistors located on the evaluation board.

J7[2:3]: Connects the External Pull-Up signal from TB1 (Pin 4) to the 4.7 kpull-up resistors on the evaluation

board.

5.6. SUSPEND LED Connector (J8)

The J8 header is used to connect the CP2112 SUSPEND pin (Pin 17) to the DS8 red LED. When the LED is on,

the device has enumerated with the PC operating normally. When the LED is off, the device has not yet

enumerated or is in the USB Suspend state.

Table 2. USB Connector Pin Descriptions

Pin # Description

1 VBUS

2D-

3D+

4 GND (Ground)

CP2112-EK

8 Rev. 0.2

6. Schematic

Figure 7. CP2112 Evaluation Board Schematic

CP2112-EK

Rev. 0.2 9

DOCUMENT CHANGE LIST

Revision 0.1 to Revision 0.2

Updated Figure 1.

Updated "4. CP2112 Windows Application" on page

Instructions and figures from updated PC application

Updated Figure 7 on page 8.

CP2112-EK

10 Rev. 0.2

CONTACT INFORMATION

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Austin, TX 78701

Tel: 1+(512) 416-8500

Fax: 1+(512) 416-9669

Toll Free: 1+(877) 444-3032

Please visit the Silicon Labs Technical Support web page:

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and register to submit a technical support request.

Silicon Laboratories, Silicon Labs, and USBXpress are trademarks of Silicon Laboratories Inc.

Other products or brandnames mentioned herein are trademarks or registered trademarks of their respective holders.

The information in this document is believed to be accurate in all respects at the time of publication but is subject to change without notice.

Silicon Laboratories assumes no responsibility for errors and omissions, and disclaims responsibility for any consequences resulting from

theuseofinformationincludedherein.Additionally, Silicon Laboratories assumes no responsibility forthefunctioningofundescribed features

or parameters. Silicon Laboratories reserves the right to make changes without further notice. Silicon Laboratories makes no warranty, rep-

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