L6223 datasheet(10/33 Pages) STMICROELECTRONICS

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The output DMOS is ON

when the corrisponding in-

put is low

Operating Mode

The bit C5 defines the two available input configu-

rations.

C5 = H: FULL MODE OPERATING

The digital inputs have the following functions:

• IN1 drives OUT1

• IN2 drives OUT2

• IN3 drives OUT3

• IN4 drives OUT4

• DA/CLEV enables the current reduction

(see Tab 2)

• DA/OPLO selects the motor current control

mode (open or close loop).

Since each input drives one phase of the motor it

is possible to work either in Half Step or in Full

Step mode. DA/OPLO defines the current control

mode as follow:

– DA/OPLO = H open loop

– DA/OPLO = L closed loop

The reduced current level is enabled by the inputs

IN1, IN2, IN3, IN4 or by DA/CLEV (Tab. 2). The

reduced current value depends from the bits C0,

C1 (TAB. 5). The outputs are disabled when the

inputs are in a prohibited state (Tab. 4).

C5 = L, SIMPLIFIED MODE OPERATING

When in SIMPLIFIED MODE OPERATING the in-

puts assume the following functions:

• IN1 drives Phase A

• IN2 drives Phase B

• IN3 ENABLE input (active High)

• IN4 enables the reduced current (Tab. 3)

• DA/CLEV enables the reduced current (Tab. 3)

• DA/OPLO selects the motor current control

mode

The SIMPLIFIED MODE OPERATING configura-

tion does not allow the drive of a unipolar motor in

Half step.

The signal DA/OPLO functions as in FULL Mode

Operation. When the current control is imple-

mented in closed loop, the reduced current level

is enabled by the inputs IN4, DA/CLEV (Tab. 3).

The current reduction depends from the bits C0,

C1 (Tab. 5).

Open/Closed Loop Motor Current Control

The logic input DA/OPLO selects the current con-

trol mode as previously seen. When in open loop,

the chopping frequency is that one as defined by

the external RC network. In open loop are avail-

able three different t(ON), depending from the bits

C2, C3 (Tab. 6), as a percentage of the RC dis-

charge time t(dis).

When in closed loop two different chopping fre-

quencies are selectable by means of the bit C4

(Tab. 7). The higher is defined by the external RC

network. The other one is exactely the half. In

closed loop 5 different current levels are avail-

able: the nominal current level and four reduced

current levels (Tab. 5). The nominal current level

is set by an internal reference voltage of 0.5V.

The configuration of bits C0, C1 sets the refer-

ence voltage to a pecentage of the nominal value.

TRUTH TABLES (L = Low; H = High; X = don’t

care)

Table 2

IN1

IN2

IN3

IN4

DA/CLEV

C/R*

HHX

XXH

HHH

XXX

*) C/R = H, reduced current

Table 3

IN4

DA/CLEV

C/R

L**

*) Reduced current **) Nominal current

Table 4

IN1

IN2

IN3

IN4

Output Stage

DISABLED

Table 5

Reduced Current Level (*)

40%

50%

70%

85%

*) Nominal level percentage

L6223

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