基于MSP430的低功耗数控直流电流源设计

his system introduces the design of controllable constant-current source based on MSP430. The MSP430 is used to control two D/A and A/D, which makes sure the system outputs an adjustable and constant current. One can randomly set current value between 0 mA and 2000mA by the keyboard or set by step. The step of current adjustment can be available 1mA at least. The system consists of three main parts, controllable power supply, constant-current source , data-sampling , which all form the connection of outer circle feedback .Inside the constant-current source part ,a 16-bit DAC is included to form a second outer feedback, by the output of MSP430 PWM and the two outer feedbacks ,we can realize the high-precision,low power and low ripple current source .