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M66242P Dataheets PDF



Part Number M66242P
Manufacturers Mitsubishi
Logo Mitsubishi
Description 4-CH 12-BIT PWM GENERATOR
Datasheet M66242P DatasheetM66242P Datasheet (PDF)

MITSUBISHI MITSUBISHI 〈DIGITAL 〈DIGITAL ASSP ASSP 〉 〉 M66242P/FP M66242P/FP 4-CH 12-BIT PWM GENERATOR 4-CH 12-BIT PWM GENERATOR DESCRIPTION M66242 Integrated Circuit has four 12-bit PWM (pulse width modulation) circuits which are built by using the CMOS (complementary metal oxide semiconductor) process. This IC controls PWM waveform by adjusting the “H” width according to serial data sent from MCU (micro controller unit) or other device. Each channel can be independently controlled. High-resol.

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MITSUBISHI MITSUBISHI 〈DIGITAL 〈DIGITAL ASSP ASSP 〉 〉 M66242P/FP M66242P/FP 4-CH 12-BIT PWM GENERATOR 4-CH 12-BIT PWM GENERATOR DESCRIPTION M66242 Integrated Circuit has four 12-bit PWM (pulse width modulation) circuits which are built by using the CMOS (complementary metal oxide semiconductor) process. This IC controls PWM waveform by adjusting the “H” width according to serial data sent from MCU (micro controller unit) or other device. Each channel can be independently controlled. High-resolution digital-analog converter can be formed easily by connecting a low-pass filter circuit to the output pins of this circuit. FEATURES • Built-in four 12-bit high-resolution pulse width modulation circuits • Easy digital-analog conversion – Quick output waveform smoothing Control by 1.22mV possible per step (VCC =5V) • Serial data input • “H” level width setting type • 4 independently controlled channels • All 4 channels reset by reset input (R) High-impedance status after reset • All 4 channels controlled by output control input (OC) • Settings take effect after ongoing cycle is completed • Input: TTL level • Output: CMOS 3-state output Output current IO = ±4mA • VCC =5V ± 10% BLOCK DIAGRAM (EACH CHANNEL) PIN CONFIGURATION (TOP VIEW) CHIP SELECT CS R RESET WRITE CONTROL WR SERIAL DATA INPUT SIN WRITE CLOCK SCLK OUTPUT CONTROL OC GND 1 2 3 4 5 6 7 14 13 12 11 10 9 8 VCC PWM1 PWM2 OUTPUT PWM3 PWM4 XOUT CLOCK OUTPUT XIN CLOCK INPUT Outline 14P4 14P2N-A APPLICATION • Analog signal control in televisions and audio systems • Control of lamps, heaters and motors • For software servo in home appliances and industrial machinery M66242P/FP 14 VCC Upper byte register SIN 4 SCLK 5 Input register 8-BIT PWM circuit PWM register 12-bit PWM circuit 4-bit-rate multiplier 13 PWM1 CS 1 WR 3 R 2 OC 6 Control circuit Lower byte register 12 PWM2 11 PWM3 10 PWM4 1/2 divider To other channels Oscillation circuit 8 XIN 9 XOUT 7 GND 1 MITSUBISHI 〈DIGITAL ASSP〉 M66242P/FP 4-CH 12-BIT PWM GENERATOR FUNCTION The PWM output waveform of each channel is controlled by taking in PWM data from MCU or other device via serial data input SIN. Twelve-bit PWM data is input being divided between upper 8 bits (upper byte) and lower 4 bits. The lower 4-bit data is combined with command data such as channel designation and input as 8-bit data (lower byte). The lower byte should be written first, and then the upper byte. Even if only the upper byte is to be changed, rewrite from the lower byte. The PWM waveform changes according to the new setting from the next cycle. One cycle of PWM waveform (4096 divisions; 12-bit resolution) are divided into 16 (24) subsections t. Each subsection consists of 256 (28; 8-bit resolution) minimum bits τ (=2/ fXIN**). One subsection t consists of a 8-bit PWM waveform (basic waveform). The “H” width of this waveform is determined according to the upper 8 bits of PWM data. One cycle has 16 subsections t, each of which has this basic waveform. Among them, those which are designated by the 4-bit-rate multiplier are conditioned to have a “H” width that is longer by τ. The lower 4 bits of PWM data are used to specify those subsections (tm). The waveform of other subsections remains unchanged. A PWM waveform (12-bit resolution) is a combination of two types of waveforms which are different in “H” width, as described above. When output control input OC is “H”, the output of every channel turns high-impedance from the next cycle. When reset input R is “L”, the output of every channel turns high-impedance as soon as the ongoing cycle is completed, and PWM data of all channels is reset. If R input is changed from “L” to “H”, the next cycle starts, however, the output of the channels remains high-impedance. To enable output, rewrite input data for each channel. **)fXIN: Clock XIN repeat frequency PIN DESCRIPTIONS Pin R CS WR SIN SCLK OC PWM1~PWM4 XIN XOUT Name Reset input Chip select input Write control input Serial data input Write clock input Output control input PWM outputs 1 thru 4 Clock input Clock output Input/Output Input Input Input Input Input Input Output Input Output Functions “L”: All 4 channels put in high impedance state. “L”: Communication with MCU becomes possible. WR, SIN and SCLK put in enable state. “L”: Serial data written. “L”-to-“H” edge: Written data stored in upper or lower byte. Inputs 8-bit serial data from MCU synchronously with clock pulses. Inputs sync clock pulses for 8-bit serial data writing. “H”: All 4 channels put in high-impedance state. Outputs PWM waveform. (CMOS 3-state output) Inputs/outputs signals generated by clock signal generation circuit. Oscillation frequency is determined by connecting ceramic or quartz resonator between XIN and XOUT. The frequency of internal clock (PWM timing clock) signals is the 1/2 divider of the frequency input from clock input XIN. When external clock signals are used, connect clock generator to XIN pin and leave XOUT open. 2 MITSUBISHI 〈DIGITA.


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