AMIS-30521 Micro-stepping Motor Driver

Data Sheet

EMC[1:0]

Adjusts the dV/dt of the PWM voltage slopes on the motor pins.

Table 25: SPI Control Parameter Overview EMC[1:0]

Index

EMC[1:0]

Slope (V/

µs)

Remark

0

0

0

150

Turn-on and turn-off voltage slope 10% to 90%

1

0

1

100

“

2

1

0

50

“

3

1

1

25

“

SM[2:0]

Selects the micro-stepping mode.

Table 26: SPI Control Parameter Overview SM[2:0]

Index

SM[2:0]

Step Mode

Remark

0

0

0

0

32

Micro-step

1

0

0

1

16

Micro-step

2

0

1

0

8

Micro-step

3

0

1

1

¼

Micro-step

4

1

0

0

½

Uncompensated half-step

5

1

0

1

½

Compensated half-step

6

1

1

0

Full

Full step

7

1

1

1

N/A

For future use

9.4 SPI Status Register Description

All four SPI status registers have Read Access and are default to "0" after power-on or hard reset.

Table 27: SPI Status Register 0

Status Register 0 (SR0)

Address

Structure

Content

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Access

R

R

R

R

R

R

R

R

Reset

0

0

0

0

0

0

0

0

04h

Data

PAR

TW

CPfail

-

OPENX

OPENY

-

-

Where:

R

Read only mode access

Reset

Status after power-pn or hard reset

PAR

Parity check

TW

Thermal warning

Cpfail

Charge pump failure

OPENX

Open Coil X detected

OPENY

Open Coil Y detected

Remark:

Data is not latched

Table 28: SPI Status Register 1

Status Register 1 (SR1)

Address

Structure

Content

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Access

R

R

R

R

R

R

R

R

Reset

0

0

0

0

0

0

0

0

05h

Data

PAR

OVCXPT

OVCXPB

OVCXNT

OVCXNB

-

-

-

Where:

R

Read only mode access

Reset

Status after power-on or hard reset

PAR

Parity check

OVXPT

Over-current detected on X H-bridge: MOTXP terminal, top transistor

OVXPB

Over-current detected on X H-bridge: MOTXP terminal, bottom transistor

OVXNT

Over-current detected on X H-bridge: MOTXN terminal, top transistor

OVXNB

Over-current detected on X H-bridge: MOTXN terminal, bottom transistor

Remark:

Data is latched

21

AMI Semiconductor

– June 2007, M-20683-001

www.amis.com