L7203S データシートの表示（PDF） - STMicroelectronics

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L7203S

SMOOTH DRIVE SPINDLE MOTOR FOR OPTICAL DRIVE APPLICATION WITH POWER INTEGRATED

STMicroelectronics 

L7203

the PWMIN signal and the internal signals, the

PWMIN signal rate must be calculated by the ex-

ternal microcontroller using the same frequency

signal provided to the chip through the pin fsys.

Digital Multiplier

This unit contains a multiplier executing the multi-

plication of each sample provided by the memory

by the value stored in kval register.

The output value is a 10-bit word, plus the sign bit.

Figure 10.

PWM Converter

The PWM converter receives from the digital mul-

tiplier three 10 bit digital number and converts it

into three PWM signals.

A counter counts up (from 0 to 255) and down

(from 255 to 0) at the Fsys rate in continuos

mode. Three 8-bit input registers are written with

the 8 most significant bit of the word to be con-

verted and compared to the counter value. The

comparator output is:

510 Tsys

255

COUNTER

OUTPUT COMPARATOR

Figure 11.

0

D98IN885A

8 MSB

OUTPUT MULTIPLIER

8/13

COMPARATOR

OUTPUT PWM:

WHERE:

OUTPUT

LSB

00

01

10

11

A HALF FSYS PERIOD

A FSYS PERIOD

D98IN886

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