L9935(1999) 查看數據表（PDF） - STMicroelectronics

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L9935
(Rev.:1999)

TWO-PHASE STEPPER MOTOR DRIVER

STMicroelectronics 

L9935

Serial Data Interface (SPI)

The serial data interface itself consists of the pins SCL (serial clock), SDI (serial data input) and SDO

(serial data output).

To especially support bus controlled applications the additional signals EN (chip enable not) and CSN

(chip select not) are available.

Startup of the Serial Data Interface

Falling slope of EN activates the device. After ten.sck the device is ready to work.

Falling slope of CSN indicates start of frame. Data transfer (reading SDI into the register) takes place at

the rising slopes of SCK.

Data transfer of the register to SDO takes place at the falling slope of SCK.

Rising slope of CSN indicates end of frame. At the end of frame data will only be accepted if modulo 8

bit (modulo 8 falling slopes to SCK) have been transferred. If this is not the case the input will be ignored

and the bridges will maintain the same status as before.

SDO is a tristate output.

SDO is active while CSN = LOW, while CSN = HIGH SDO is high resistive.

Figure 7. SPI Data/Clock Timing.

ten_sck

EN

CSN

SCK

SDI

SDO

AX

CSN

SCK

SDI

SDO

12/19

MSB7 bit6

bit5

bit4

bit3

bit2

bit1

bit0

MSB7 bit6

ERROR BITS

bit5

bit4

bit3

bit2

bit1

bit0

CURRENT A

POLARITY A

CURRENT B POLARITY B

tPd

t1

t1

td

tcl

tch

tsu tsh

bit7

bit7

t1

t1

bit0

tzch

bit0

D99AT437

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