Special Feature: Digital Power supply

Special Feature: Digital Power supply Sanken Power IoT

Glossary of Digital Related Terms

Term Formal Name Meaning
Analog to Digital Converter This unit samples external analog signals and converts them to digital values. A 12-bit ADC converts the voltage amplitude of analog signals to digital values of 4096 steps (0-4095).
CPU Central Processing Unit This unit fetches in the instructions of a program stored in a ROM etc., decodes and executes them.
Digital to Analog Converter This unit converts digital values to an external output as analog signals. A 10-bit DAC converts digital values of 1024 steps (0-1023) to voltage levels of analog signal, and outputs it.
DSAC Direct SFR Access Controller This function automatically transfers data among SFR (Special Function Registers) of the peripheral functions triggered by the event generated by the peripheral functions, such as analog comparator detection or finish of A-D conversion. By transferring data automatically without use of a CPU, for example, ADC⇒DSP⇒PWM, it is possible to make the control loop of digital power supply run by itself.
DSP Digital Signal Processor This unit executes multiplication and multiply & accumulation at a high speed to execute the digital filtering process.
EPU Event Processing Unit Zero Time Task Switching by a small 16-bit processor.Process up to 6 pre-programmed tasks with corresponding events. Supports power control that requires high-speed processing by executing in parallel with the CPU and DSP.
FLASH - ROM that can write word data into it and erase block data on it electrically.
GPIO General Purpose Input / Output These are the external terminals of MCU, which can be set as either digital input ports or digital output ports. In the case of input ports, the terminal level can be read from the CPU. In the case of output ports, the terminal level can be set from the CPU. In addition, GPIO can be changed to peripheral functional signals (PWM and so on) and analog signals (ADC input or DAC output).
I2C Inter Integrated Circuit This unit transfers serial data using only the two signals of clock and data. Since both the signals are open drain, the transfer speed is around 400 kbps. Serial data can be transferred between multiple master units and multiple slave units.
Term Formal Name Meaning
IDE Integrated Development Environment An integrated development environment. This tool operates on a PC to develop CPU programs. Various functions such as an editor, C-compiler, or debugger are supported.
IRC Internal Reference Clock An internal clock oscillator
LVD Low Voltage Detector A function to detect a brown out in the power supply voltage
MCU Micro Controller Unit A micro computer integrating not only the CPU but also a ROM or peripheral functions in one chip
OCD On Chip Debugger This function supports debugging the CPU programs of which is incorporated into a chip.
PLL Phase Locked Loop This function multiplies the clock frequency.
POR Power On Reset This function generates a reset when the system power is turned ON.
PWM Pulse Width Modulation This unit generates the PWM waveform to control ON/OFF of MOSFET in power converter etc.
RAM Random Access Memory This memory can be read or written by the CPU and so on. When the system power is turned OFF, the content of the memory is disappeared.
ROM Read Only Memory This memory can only be read out but cannot be written in generally. To write or erase data, special user operations like a flash memory are necessary. The content of the memory is maintained even if the system power is turned OFF.
SAR Successive Approximation Register This term generally indicates a type of ADC. The SAR ADC stands for a successive approximation ADC. This method converts analog level to the closest digital value by comparing the same times as the bit resolution.
Term Formal Name Meaning
SFR Special Function Register This is the register to configure and control the peripheral functions. This register can be accessed from the CPU or the DSAC.
SPI Serial Peripheral Interface This unit transfers serial data in synchronization with the clock. It uses four interfaces: the select signal, clock signal, transmit data, and receive data. High-speed transfer faster than 1Mbps (bit per second) is achieved. Serial data can be transferred between single master unit and multiple slave units.
Timer - This unit generates an interrupt periodically, outputs the pulse of a certain width or cycle, or measures the width of the pulse input from outside.
UART Universal Asynchronous Receiver Transmitter This unit transfers serial data using 2 interfaces of transmit and receive data. This method transmits and receives data by matching the transfer speed in both the transmit and receive, and inserting a synchronization pulse at the top of the transaction signal. The maximum transfer speed is around 900kbps. One-to-one communications are basically performed.
WDT Watch Dog Timer This unit detects the abnormal condition and runaway (crash) condition of the CPU. If the register in the WDT is not accessed by the CPU within a certain period because of, for example, the runaway condition of the CPU, the WDT generates the reset signal to the entire chip.
Event - This is the event pulse signals which are generated by the peripheral functions, such as analog comparator detection or the finish of A/D conversion. Other modules must know the occurrence of the event, so, the event signals are distributed among the functional modules on the chip.
Interrupt - This means the following processing: Define part of the events of the peripheral functions as an interrupt request signal. When this interrupt request signal is generated, suspend the program execution of the CPU once. Then, execute another program corresponding to this interrupt request, and return control to the original program again when execution of that program ends. For example, an interrupt is used when an overcurrent detected by analog comparator should force the CPU to execute a pre-determined process within short response time, or there is a process that the CPU must execute periodically in accordance with the PWM cycle.

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