L7200 Просмотр технического описания (PDF) - STMicroelectronics

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L7200

MOZART, 12V DISK DRIVE SPINDLE & VCM, POWER & CONTROL “COMBO”

STMicroelectronics 

L7200

SERIAL PORT

PARAMETER

SCLK Period, (TSCK )

SCLK low time, (TCKL )

SCLK high time, (TCKH )

Enable to SCLK (TSDENS )

SCLK to disable (TSDENH )

Data set-up time before rising edge SCLK (TDS )

Data hold time (TDH )

Minimum SDEN low time (TSDENL)

Figure 1. Serial Port Timing Information

SDEN

MIN.

25

10

10

10

12.5

5

5

30

TYP.

MAX.

15

UNITS

ns

ns

ns

ns

ns

ns

ns

ns

SCLK

SDATA

0

A0

A1

A6

D0

D1

D2

D7

1st Byte

Serial Port Write Timing

2nd Byte

SDEN

SCLK

SDATA

1

A0

A1

A6

D0

D1

D7

1st Byte

Serial Port Read Timing

2nd Byte

SERIAL PORT OPERATION

The serial port interface is a bi-directional port for reading and writing programming data from/to the internal reg-

isters of this device. For data transfers SDEN is brought high, serial data is presented at the SDATA pin, and a

serial clock is applied to the SCLK pin. After the SDEN goes high , the first 16 pulses applied to the SCLK pin

will shift the data presented at the SDATA pin into an internal shift register on the rising edge of each clock. An

internal counter prevents more than 16 bits from being shifted into the register. The data in the shift register is

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