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Single-Chip HID USB to SMBus Master Bridge

CP2112 Data Sheet

The CP2112 devices are designed to quickly add USB to your

applications by eliminating firmware complexity and reducing de-

velopment time.

These highly-integrated USB-to-SMBus bridge controllers provide a simple solution for

adding USB using a minimum of components and PCB space. The CP2112 includes a

USB 2.0 full-speed function controller, USB transceiver, oscillator, and a total of 8

GPIOs in a compact 4 x 4 mm QFN-24 package. All customization and configuration

options can be selected using a simple GUI-based configurator. By eliminating the

need for complex firmware and driver development, the CP2112 devices enable quick

USB connectivity with minimal development effort.

CP2112 is ideal for a wide range of applications, including the following:

• Point-of-Sale products

• USB dongles

• Data loggers

• Medical meters

• Handheld controllers

KEY FEATURES

• No firmware development required

• Simple GUI-based configurator

• Integrated USB transceiver; no external

resistors required

• Integrated clock; no external crystal

required

• USB 2.0 full-speed compatible

• Standard HID class device – no custom

driver needed

• 8 GPIOs with configurable options

CP2112

Connect to

VBUS or

External Supply

REGIN

VDD

Voltage

Regulator

48 MHz

Oscillator

GND

SMBus

Controller

SDA

SCL

To

SMBus

Slave

Devices

USB

Connector

VBUS

D+

D-

GND

VBUS

D+

D-

USB Interface

GPIO.0_TXT

Full-Speed

12 Mbps

Transceiver

Peripheral

Function

Controller

GPIO.1_RXT

GPIO.2

GPIO.3

/RST

VPP

194 Byte PROM

(Product Customization)

I/O Power and Logic Levels

GPIO and

Suspend

Controller

GPIO.4

GPIO.5

GPIO.6

GPIO.7_CLK

GPIO

Signals

/SUSPEND

SUSPEND

Logic Level

Supply

(1.8V to VDD)

VIO

I/O Power and Logic Levels

Suspend

Signals

silabs.com

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Rev. 1.3

CP2112Data Sheet

Feature List and Ordering Information

1. Feature List and Ordering Information

CP

2112

–

F 03

–

G M R

Tape and Reel (Optional)

Package Type — QFN24

Temperature Grade — –40 to +85 °C (G)

Firmware Revision

Hardware Revision

Interface Family, HID USB-to-SMBus Bridge

Silicon Labs Xpress Product Line

Figure 1.1. CP2112 Part Numbering

The CP2112 devices have the following features:

•

Single-Chip HID USB to SMBus Master Bridge

• Integrated USB transceiver; no external resistors or crystal

required

• SMBus master device

• GPIO can be configured as Input/Output and Open-Drain/

Push-Pull

• 512 Byte SMBus data buffer

• Integrated 194 Byte One-Time Programmable ROM for

storing customizable product information

• On-chip power-on reset circuit

• On-chip voltage regulator: 3.45 V output

•

USB Peripheral Function Controller

• USB Specification 2.0 compliant; full-speed (12 Mbps)

• USB Suspend states supported via SUSPEND

and /SUSPEND pins

•

HID Interface

• Standard USB class device requires no custom driver

• Supported on Windows, Mac, and Linux

• Open access to interface specification

•

Windows, Mac, and Linux HID-to-SMBus Libraries

• APIs for quick application development

•

SMBus Configuration Options

• Configurable Clock Speed

• Device Address: 7-bit value that is the slave address of the

CP2112. The device will only ACK this address, but will not

respond to any read/write requests

• Read/Write Timeouts

• SCL Low Timeout

• Retry Counter Timeout

•

GPIO Interface Features

• 8 GPIO pins with configurable options

• Usable as inputs, open-drain or push-pull outputs

• Configurable clock output for external devices

• 48 MHz to 94 kHz

• Toggle LED during SMBus reads

• Toggle LED during SMBus writes

•

Supply Voltage

• Self-powered: 3.0 to 3.6 V

• USB bus powered: 4.0 to 5.25 V

• I/O voltage: 1.8 V to V

DD

•

Ordering Part Number

• CP2112-F03-GM

•

Package

• RoHS-compliant 24-pin QFN (4 x 4 mm)

•

Temperature Range: –40 to +85 °C

silabs.com

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Rev. 1.3 | 1

CP2112Data Sheet

System Overview

2. System Overview

The CP2112 is a highly-integrated HID USB-to-SMBus Bridge providing a simple solution for controlling SMBus slave devices with USB

and using a minimum of components and PCB space. The CP2112 includes a USB 2.0 full-speed function controller, USB transceiver,

oscillator, and a one-time programmable ROM in a compact 4 x 4 mm QFN-24 package (sometimes called “MLF” or “MLP”).

The on-chip, one-time programmable ROM provides the option to customize the USB Vendor ID, Product ID, Manufacturer Product

String, Product Description String, Power Descriptor, Device Release Number, and Device Serial Number as desired for OEM applica-

tions.

The CP2112 uses the standard USB HID device class, which is natively supported by most operating systems. A custom driver does

not need to be installed for this device. Host applications communicate with the CP2112 through interface libraries provided by Silicon

Labs. The interface specification for the CP2112 is also available to enable development of an API for any operating system that sup-

ports HID.

The CP2112 SMBus interface includes the SDA and SCL signals needed for SMBus communication and is configurable. The configura-

ble options include the clock speed, read/write timeouts, retry counter timeout, SCL low timeouts, and a 7-bit device address. The

CP2112 will only ACK the 7-bit device address assigned to it but will not respond to any read/write requests. External pull-up resistors

are needed for the SCL and SDA signals.

The device also features a total of eight GPIO signals. The GPIO signals are controlled through USB and can be configured as Input/

Output and Open-Drain/Push-Pull. Three of the GPIO signals support alternate features including a configurable clock output (48 MHz

to 94 kHz) and TX and RX LED toggle. Support for I/O interface voltages down to 1.8 V is provided via a V

IO

pin.

An evaluation kit for the CP2112 (Part Number: CP2112EK) is available. It includes a CP2112-based HID USB-to-SMBus evaluation

board, Windows DLL and test application, USB cable, and full documentation. Go to

www.silabs.com

for the latest application notes

and product support information for the CP2112. Contact a Silicon Labs sales representatives or go to

http://www.silabs.com

to order

the CP2112 Evaluation Kit.

silabs.com

| Smart. Connected. Energy-friendly.

Rev. 1.3 | 2

CP2112Data Sheet

Electrical Specifications

3. Electrical Specifications

3.1 Electrical Characteristics

All electrical parameters in all tables are specified under the conditions listed in

3.1.1 Recommended Operating Conditions,

unless sta-

ted otherwise.

3.1.1 Recommended Operating Conditions

Table 3.1. Recommended Operating Conditions

Parameter

Digital Supply Voltage

Digital Port I/O Supply Voltage

Voltage on V

PP

with respect to

GND during a ROM programming

operation

Capacitor on V

PP

for ROM pro-

gramming

Supply Current

1

Symbol

V

DD

V

IO

V

PP

V

IO

≥ 3.3 V

Test Condition

Min

3.0

1.8

5.75

Typ

—

Max

3.6

V

DD

V

IO

+ 3.6

Unit

V

C

PP

I

DD

Normal Operation;

V

REG

Enabled

Suspended;

V

REG

Enabled

—

4.7

15

—

16

µF

mA

—

130

230

µA

Supply Current - USB Pull-up

2

Specified Operating Temperature

Range

I

USB

T

A

—

-40

200

—

228

+85

µA

°C

Note:

1. If the device is connected to the USB bus, the USB pull-up current should be added to the supply current to calculate total re-

quired current.

2. The USB pull-up supply current values are calculated values based on USB specifications.

silabs.com

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Rev. 1.3 | 3

CP2112Data Sheet

Electrical Specifications

3.1.2 SMBus, GPIO, and Suspend I/O Electrical Characteristics

Table 3.2. SMBus, GPIO, and Suspend I/O

Parameter

Output High Voltage

Symbol

V

OH

Test Condition

I

OH

= -10 µA

I

OH

= -3 mA

I

OH

= -10 mA

Output Low Voltage

V

OL

I

OL

= 10 µA

I

OL

= 8.5 mA

I

OL

= 25 mA

Input High Voltage

Input Low Voltage

Input Leakage Current

V

IH

V

IL

I

LK

Weak Pull-Up Off

Weak Pull-Up On, V

IO

= 0 V

Maximum Input Voltage

V

IN-MAX

Open drain, logic high (1)

Min

V

IO

– 0.1

V

IO

– 0.2

—

0.7 x V

IO

—

Typ

—

V

IO

– 0.4

—

0.6

—

25

—

Max

—

0.1

0.4

—

0.6

1

50

5.8

Unit

V

µA

V

3.1.3 Reset Electrical Characteristics

Table 3.3. Reset

Parameter

/RST Input High Voltage

/RST Input Low Voltage

Minimum /RST Low Time to Gen-

erate a System Reset

VDD Ramp Time

Symbol

V

IH-RST

V

IL-RST

t

RSTL

t

RMP

Test Condition

Min

0.75 x V

IO

—

15

—

Typ

—

Max

—

0.6

—

1

Unit

V

μs

ms

3.1.4 Voltage Regulator

Table 3.4. Voltage Regulator

Parameter

Input Voltage Range

Output Voltage

VBUS Detection Input Threshold

Bias Current

Symbol

V

REGIN

V

DD

V

IH-VBUS

I

REG

Output Current = 1 to 100 mA

1

Test Condition

Min

3.0

3.3

2.5

—

Typ

—

3.45

—

Max

5.25

3.6

—

120

Unit

V

µA

Note:

1. The maximum regulator supply current is 100 mA. This includes the supply current of the CP2112.

silabs.com

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Rev. 1.3 | 4

	HID-USB-TO-IR-RD	CP2112-F01-GM	CP2112-F02-GMR	CP2112-F03-GMR
描述	ref='/w_kit.html'>kit ref design hid usb TO IR	IC HID USB-TO-SMBUS BRIDGE 24QFN	IC HID USB-TO-SMBUS BRIDGE 24QFN	IC HID USB-TO-SMBUS BRIDGE 24QFN
厂商名称	-	Silicon Laboratories Inc	Silicon Laboratories Inc	Silicon Laboratories Inc
Reach Compliance Code	-	unknown	compliant	compliant
Base Number Matches	-	1	1	1

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