This kind of cell phone jammer has the high quality design

However, under the control of the main controller to complete the transmission of data signals, it sends the data signal is usually the response information to their own tell the CPU. Communication between the CPU utilization the SCU line and the SDA line and charged with the circuit, and thus complete control of the accused circuit. I2C bus is only two lines, which determines its data transmission is serial (ie, the transmission of a one, this serial bus is no parallel bus input and output capabilities, but makes the circuit connection to a simple change, but also effective in reducing the control of the CPU feet due to the I2C bus is a two-lane, two-way serial bus data transfer must be in strict accordance with the format, the I2C Bus data transmission has the following features. It is the intelligent programmable    cellphone jammer  .
Data transfer order must be: start bit, charged with the circuit to address the data transfer direction bit (read / write) acknowledge bit data signals, a confirmation-bit data signals, acknowledge bit, stop bit. The clock lines remain high during the data line from high to low transition is defined as the starting bit, whereas for the termination of bits. Initiation site and termination of the digital signal is sent by the host CPU when the CPU issues a start bit signal, the bus is considered in the total occupation of state when the CPU a notice of termination signals, the bus is considered to be in the air with the state when the bus empty with two lines, SDA, SCL should be maintained high. During data transfer, the SCL line is high during the SDA data line must remain stable, the SCL line low during the data of the SDA line is allowed to change.   cell phone jammer   can help the school to guarantee the normal teaching order.
SDA line transmission of the data bytes of eight, each transfer limitation of the total number of bytes, the address of the circuit of the accused occupied 7, 7 for the data transmission lines in the direction bit, the CPU sends data and receive data, followed by a confirmation signal after each data byte in the confirmation of the clock period, the CPU release data for controller in this response message sent. Every data transfer on the I2C bus are carried out between the master data transmission process shown in Figure 2-2-14. In the absence of data transfer, the SDA and the SCL are pulled high, master first generates a start signal when the need for data transmission (both SCL is high, the SDA to the master device down the falling edge). The installation height of   phone jammer   is hard for students to touch.
Pass one bit of data then appears in each SCL clock pulse, until the master to generate a stop signal (both SCL is high, the SDA for the rising edge of the master release) date. I2C bus master first sends controller 7 address and read / write a byte in each byte, the master must wait to be controller acknowledge bit, both the master release SDA data line controller in the ninth SCL pulse during the next pull down the SDA data line to indicate the answer. Then followed by the master to send data controller (write the passive controller) or to the receiver was controller to send data (read controller), the last stop signal issued by the master to notify the controller to the end of the entire data the transfer process. Other objects shouldn’t be placed on    cell phone jammer   when it works to avoid influencing shielding effect or damaging the machine.
I2C bus protocol provides data transfer length 8, with different rules every time you send the number of data bytes and the byte address. Programmable devices often need to pass command to determine the next data transfer operation. For example, the master mode of operation conducted, including: byte write, page write, read, immediately choose to read, continuous read many cases, the byte write mode the master sends a start signal and to 24WC02 device address, then send written to the byte address and write data to send, and finally send stop signal to complete a write operation; page write mode and byte write mode the difference is only one data byte write after not sent immediately to stop the signal. The testing data of   cell phone jammers  shows that the signal will not do harm to the human body.
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