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Tham khảo tài liệu 'mcgraw-hill- pda robotics - using your pda to control your robot 1 part 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | PDA Robotics tery pack. The grounds are and must be connected common ground . The circuit s block diagram is shown in Figure 5.42. Maximum Ratings. The maximum ratings are shown in Figure 5.43. I really like this chip because it will shut down if it is overloaded and becomes hot. It is a nasty sight and smell seeing a smoke plume when an overloaded component like a transistor melts down. The L298 can handle a respectable load for its compact size 3 amps 25 watts . It might be overkill for the motors it drives in this project but it also means that you can connect much more powerful motors if you decide to change the design. The enable feature and the 2-pin logic lines with a wide voltage range of -0.3 to 7 V per side makesa great logic interface. ST microelectronics and Protel provide the footprint and profile for use in the Protel 98 and Protel DXP circuit design programs allowing you to simply drop the chip into your circuit design. Figure 5.44 a picture of the package we are using in the project showing the pin layout. The short pins are set forward and the longer are to the back of the chip. Table 5.5 Pin Descriptions Pins Name 1 15 Sense A Sense B 2 3 Out 1 Out 2 Function Between this pin and ground is the sense resistor connected to control the current of the load. Outputs of the Bridge A the current that flows through the load connected between these two pins is monitored at pin 1. continued on next page Figure 5.43 Maximum ratings. 98 Chapter 5 The Electronics Figure 5.44 L298 pin layout. Table 5.5 Pin Descriptions continued Pins Name Function 4 Vs Supply Voltage for the Power Output stages. A noninductive 100nF capacitor must be connected between this pin and ground. 5 7 Input 1 Input 2 TTL Compatible Inputs of the Bridge A. 6 11 Enable A EnableB TTL Compatible Enable Input the L state disables the bridge A enable A and or the bridge B enable B . 8 GND Ground. 9 VSS Supply Voltage for the Logic Blocks. A100nF capacitor must be connected between this pin .
