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MCU-based intelligent vehicle power management design

With the technological advances of the automotive industry and electronics, automotive electrical equipment is increasing. Traffic police car because of its particularity requirements and occasions, more on-board power supply put forward new demands. For the realization of the information processing requirements of the mobile police, onboard computer, video surveillance equipment, night lighting equipment, automotive radar gun and some high-power electrical equipment is integrated in the interior of the car. Require reliable control of the device power settings, and later when the car stopped, the battery voltage decreases, cutting off power peripherals, to ensure that the car ignition systems work properly and the battery will not cause damage due to excessive discharge . Almost all electronic components and circuits connected to the vehicle battery require protection from suppressed, the transient voltage (up to 60V) and the reverse voltage state of damage. Meanwhile, the battery power is low, suggesting that the data in the the user backup car computer, reset mechanical telescopic parts, in order to ensure reliable security in various parts of the car.
Said actual requirements, this paper proposes to STC5410AD microcontroller-based control unit, the power supply management of the vehicle-mounted electrical equipment through the error amplifier, a current detector, and a voltage detection circuit, according to the set parameters.
    The MCU is a new generation of high-speed MCU, the instruction code is fully compatible with the traditional 8051, 8-12 times faster, the internal integration of the MAX810 a dedicated reset circuit, the external crystal 20M, Province external reset circuit. 4-channel PWM, high-speed 10 A / D conversion, motor control, strong interference occasions. The microcontroller must have a full-duplex serial communication port between the MCU and PC serial communication to a level conversion circuit, because the computer's serial port I tower 232 level, while the serial port of the microcontroller The 11L or CMOS levels, we used the the dedicated chip SP232EQ Oh convert.
· Operating voltage: 5.5V ~ 3.5V microcontroller (5V MCU) / 3.8V-2.2V (3V MCU)
· Operating frequency range :0-35MHz
· User application space 10K, on-chip integration 512RAM
· GPIO port 15 can be set to four modes: quasi-bidirectional / weak pull-up, push-pull, the strong pull, input-only (high impedance)
· PWM (Road) / PCA (Programmable Counter Array)
· ISP (In System Programming) / IAP (In Application Programming), without special programming and a dedicated emulator can facilitate the design of hardware circuit connected applications, while debugging side directly through the serial port (P3.0/3.1) Download the user program
    · LO-bit, 8-channel, high-speed A towel converter, speed can be up to 100KHz (10 million times), do temperature detection, battery voltage detection, key scan, spectrum detection. A / D conversion result is calculated as follows:
    (ADC_DATA [7:0], the ADC LOW2 [1:0]) = 1024xVin/Vcc input voltage Vin analog input channels, Vcc for the actual operating voltage of the microcontroller, MCU operating voltage as analog reference voltage. Take the the ADC D Four Points steep 8 8 ADC conversion, take 2 the ADC LoW2 low-ADC conversion low 2, compared to 10-bit accuracy.