Data Sheet AS8446

Revision 1.8, Date 2005-03-17

Page 17 of 35

Slew rate regulation programming, off switch,

SRoff = 0, 1, 2, … 31

Register write by: Three Wire Interface

Register read by: Three Wire Interface and FET driver unit

-

-

-

d4

d3

d2

d1

d0

R4<4:0>

SRoff

-

-

-

1111

1

start up values

Slew rate regulation programming, off switch,

constant driver input current

SRoff_stat = 0, 1, 2, … 15

µA * (SRoff_stat + 1) * Acu_off

Register write by: Three Wire Interface

Register read by: Three Wire Interface and FET driver unit

-

-

-

-

d3d2d1

d0

R5<3:0>

SRoff_stat

---

-

1

1

1

1

start up values

Current amplification of the driver for on and off switch

R6<0> = 0

R6<0> = 1

R6<1> = 0

R6<1> = 1

Register write by: Three Wire Interface

Register read by: Three Wire Interface and FET driver unit

---

---

Acu_off

Acu_on

R6<1:0>

Acu_on Acu_off

---

---

00

start up values

Programming of the motor current measurement and over current detection unit

The motor current measurement unit transforms the differential voltage over the measurement resistor

Def. of the voltage amplification of the motor current measurement unit:

Voltage amplification of the normal current measurement channel:

1.

Voltage amplification of the normal current measurement channel