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R8A66173SP Dataheets PDF



Part Number R8A66173SP
Manufacturers Renesas Technology
Logo Renesas Technology
Description 4-CH 12-BIT PWM GENERATOR
Datasheet R8A66173SP DatasheetR8A66173SP Datasheet (PDF)

R8A66173SP 4-CH 12-BIT PWM GENERATOR REJ03F0264-0100 Rev.1.00 Jan.24.2008 DESCRIPTION R8A66173 has four 12-bit PWM (Pulse Width Modulation) circuits which are built by using the CMOS 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 (D-A) converter can be formed easily by connecting a low-pass filter (LPF) circuit to the ou.

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R8A66173SP 4-CH 12-BIT PWM GENERATOR REJ03F0264-0100 Rev.1.00 Jan.24.2008 DESCRIPTION R8A66173 has four 12-bit PWM (Pulse Width Modulation) circuits which are built by using the CMOS 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 (D-A) converter can be formed easily by connecting a low-pass filter (LPF) circuit to the output pins of this circuit. R8A66173 is the succession product of M66242. www.DataSheet4U.com FEATURES ● Built-in four 12-bit high-resolution PWM circuits ● Easy D-A conversion – Quick output waveform smoothing Control by 1.22mV possible per step (VCC=5V range) ● Serial data input ●“H” level width setting type ● 4 channels controlled independently ● 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 ● Output : CMOS 3-state output Output current Io=±4mA (Vcc=5.0V range), Io=±2mA (Vcc=3.3V range) ● Wide operating supply voltage range (Vcc=3.0~3.6V or Vcc=4.5~5.5V, single power supply) ● Wide operating temperature range: Ta=-40oC~+85 oC APPLICATION ● Analog signal control in televisions and audio systems ● Control of lamps, heaters and motors ● For software servo in home appliances and industrial machinery PIN CONFIGURATION (TOP VIEW) CHIP SELECT RESET WRITE CONTROL SERIAL DATA INPUT WRITE CLOCK OUTPUT CONTROL CS R WR SIN Sc LK OC GND 1 2 3 4 5 6 7 14 13 12 11 10 9 8 Vcc PWM1 PWM2 OUTPUT PWM3 PWM4 XOUT XIN CLOCK OUTPUT CLOCK INPUT REJ03F0264-0100 Rev.1.00 Jan.24.2008 Page 1 of 12 R8A66173SP BLOCK DIAGRAM (EACH CHANNEL) 14 Vcc Upper byte register SIN SCLK 4 5 8-bit PWM circuit PWM register 12-bit PWM circuit 4-bit-rate multiplier 13 Input register PWM1 Low er byte register CS WR 1 3 2 6 12 11 PWM2 PWM3 PWM4 www.DataSheet4U.com R OC Control circuit 1/2 divider To other channels 10 Oscillation circuit 8 9 7 XIN XOUT GND 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. 12-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 an 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. The 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 4-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 REJ03F0264-0100 Rev.1.00 Jan.24.2008 Page 2 of 12 R8A66173SP PIN DESCRIPTIONS Pin R CS WR SIN SCLK OC PWM1 PWM4 Name Reset input Chip select input Write control input Serial data input Write clock input Output control input PWM outputs 1 4 Input/Output Functions Input "L" : All 4-channels put in high-impedance state. Input Input Input Input Input Output "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 register. Inputs 8-bit serial data from MCU synchronously with SCLK clock. 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) Input/output 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 c.


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