1. Functionbrief introduction

USB to SMbus/I2CAdapter is a practical and convenient multi-function conversion board. Through PC host PC software, it is easy to communicate with SMBus or I2C device interface. The second generation USB2IIC Adpater also adds a configurable IO and a 48M clock output signal pin with a frequency divider 1~256.

Two, SMBus, and I2C concepts

The I2C bus is made up ofPHILIPSThe two wire serial bus developed by the company is used for connection.Micro controllerAnd its peripherals. It is a bus standard widely used in the field of microelectronic communication control. It is a special form of synchronous communication, and has the advantages of fewer interface lines, simpler control modes, smaller device encapsulation form and higher communication speed.

SMBus is the abbreviation of System Management Bus, which was put forward by Intel in 1995 and applied to mobile PC.desktopLow rate communication in PC system. It mainly hopes to adopt a cheap and powerful one.Bus(consisting of two lines) to control the equipment on the motherboard and collect the corresponding information.

The difference between three, SMBus and I2C

SMBus and I2CBusThere are some differences between the time series characteristics. First, SMBus needs a certain data retention time, while I2CBusIt is an internal extension of data retention time. SMBus has a timeout function, so when SCL is too low to exceed 35 ms, the device will reset the ongoing communication. On the contrary, I2C uses hardware reset. SMBus has an alert response address (ARA), so when an interrupt is generated from the device, it does not immediately clear the interruption, but keeps it until it receives a ARA sent by the main device with its address. SMBus works only from 10kHz to the highest 100kHz. minimumworking frequency10kHz is determined by the SMBus timeout function

Four. Connection sign

Five. Connection mode

When the I2C device has no external power supply, it can choose the VDD (3.3V) of the splice board to power the I2C equipment. It is worth noting that the VDD on the switch board is only the driving power of 200MA. If the I2C equipment needs more current, please connect the external power supply and use second kinds of connection methods. When the I2C device does not need the power supply of the adapter, second ways are used.

Six. Software reading and writing interface:

Chinese version:

English version:

Seven. Instructions for use

Please ask the seller after placing order.

Nine. Packing list

1. USB-IIC adapters 1

2. USB data lines 1

3. high quality DuPont line 6pin

Software://www.mediafire.com/file/82i80ne9bj8kawz/USB_to_I2C.zip/file