Data Sheet AS8446

Revision 1.8, Date 2005-03-17

Page 16 of 35

Summary of all programmable registers (parameters, functions)

Register /

address

Internal name

Meaning

Note

Ra<b1:b0> means: address = a, most significant data bit = b1, least significant data bit = b0

All registers can be write and read by the Three-Wire Interface (write priority has the Three-Wire Interface).

1. The start up reset of all registers unless the R17 and the R18 is done by the signal nPOR (controlled by the VDD).

2. The start up reset of the register R17 is done by the nPORraw (controlled by the voltage VDDraw) only.

3. The start up reset of the register R18 (failure register) is done with a delay after the nPOR, this delay is generated

by the enable signal of the charge pump VPok.

Programming of the driver output currents (independent for switch on and switch off)

R0<7:0>

Not used

Slew rate regulation programming, on switch,

SRon = 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

R1<4:0>

SRon

-

-

-

1111

1

start up values

Slew rate regulation programming, on switch,

constant driver output current

SRon_stat = 0, 1, 2, … 31

µA * (SRon_stat + 1) * Acu_on

Register write by: Three Wire Interface

Register read by: Three Wire Interface and FET driver unit

-

-

-

d4

d3

d2

d1

d0

R2<4:0>

SRon_stat

-

-

-

1111

1

start up values

Slew rate regulation programming, on switch,

SRon_min = 0, 1, 2, …7

Register write by: Three Wire Interface

Register read by: Three Wire Interface and FET driver unit

-

-

-

-

-

d2

d1

d0

R3<2:0>

SRon_min

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1

1

1

start up values