APX6223 Datasheet, PDF (10/16 Pages) Anpec Electronics Coropration – DSC Motors Driver IC

APX6223
Function Descriptions
The APX6223 CMOS single chip builds driving capability
for Digital Still Camera Exposure /Shutter/Focus/Zoom
motor operation. The APX6223 can meet maximum
various combinations of motor types inside of the DSC.
The four groups of the independent inputs from host to
control drive motor operations. The BRK selection pin
can set 2 types of operations for channels 1~4 H bridge,
which can set brake function for voltage control H bridge
if BRK set “L”.
Stepping motor control truth table (for channel 1,2 or
3,4)
IN1A IN1B IN2A IN2B OUT1A OUT1B OUT2A OUT2B Half-step Full-step
HL L L H
L
Z
Z
(1)
HLHL H
L
H
L
(2)
(1)
L LHL Z
Z
H
L
(3)
LHHL L
H
H
L
(4)
(2)
LHLL L
H
Z
Z
(5)
L H L H L H L H (6)
(3)
LLLH Z
Z
L
H
(7)
HL LH H L
L H (8)
(4)
Note : ‘Z’high impedance
BRK CH1
CH2
H IN1A/IN1B IN2A/IN2B
L EN1/IN1B EN2/IN2B
CH3
IN3A/IN3B
EN3/IN3B
CH4
IN4A/IN4B
EN4/IN4B
Note: BRK pin setting only available channel 1~4
IN/IN input control truth table (n=1~6)
INnA
L
H
L
H
INnB
L
L
H
H
OUTnA
Z
H
L
L
OUTnB
Z
L
H
L
Note : ‘Z’high impedance
Mode
OFF
Forward
Reversed
Brake
EN/IN input control truth table (n=1~4)
ENn
INnB
OUTnA OUTnB
Mode
L
-
Z
Z
OFF
H
L
H
L
Forward
H
H
L
H
Reversed
Constant Voltage H-Bridge (Channel 5)
The VOUT5A & VOUT5B are constant voltage output,
which is four times as large as VC5 input. Output
becomes saturated when VC5=VDD. This channel is
for DC motor Zoom operation.
VC5
Constant
voltage
4R
H bridge
4R
(CH5)
R
R
Note : ‘Z’high impedance
Stepping Motor Control
Refer the list below table for stepping motor control,
which is defined as half-step and full-step motor control.
The half-step is controlled by the following sequence
(1)->(2)->(8)->(1) ->… , but for reverse side, sequence
(1)->(8)->(7)->… . Moreover, the full-step is controlled
by the following sequence (1)->(2)->(3)->(4)->(1)… , but
for reverse side, sequence (1)->(4)->(3)->… . These
channels are for DC motor Focus & Iris operation.
Figure1. Constant Voltage Control Setting
Constant Current H-Bridge (Channel 6)
Channel 6 is a fixed current drive for VCM motor Shutter
operation. When set V_REFCT to “L”, and voltage from
VREF is 1.2V through voltage resistors divider 100KΩ
& 20KΩ (refer Figure2), and that VC6 can be calculated
1.2V x 20/(100+20) = 0.2V. If the package leads
impedance is ignored (compare with RNF6 1Ω), that
Copyright © ANPEC Electronics Corp.
10
Rev. A.2 - Jul., 2005
www.anpec.com.tw