iC-PT 3324
preliminar y
Rev A6, Page 1/9
6-CH. PHASED ARRAY OPTO ENCODER (33-1024)
FEATURES
o
o
o
o
o
o
o
o
o
o
o
o
o
Monolithic photodiode array with excellent signal matching
Very compact size for small encoders
Moderate track pitch for relaxed assembly tolerances
Low noise signal amplifiers with high EMI tolerance
Single-pin programming of 3 operating modes:
analog, digital, and x2 interpolation
A-AND-B gated Z index signal
Complementary outputs: A, B, Z and NA, NB, NZ
U, V, W commutation signals (digital/analog)
All outputs +/- 4 mA push-pull, current-limited and
short-circuit-proof
LED power control with 40 mA high-side driver
Single 3.5 V to 5.5 V operation, low power consumption
Operating temperature range of -40 to +85 °C
(optional -40 to +120 °C)
Suitable code disc: PT3S 33-1024 (glass)
OD
∅33.2
mm, ID
∅13.0
mm, optical radius 14.5 mm,
1024 ppr and 3 ppr commutation (120°)
APPLICATIONS
o
Incremental encoder
o
BLDC motor commutation
PACKAGES
optoQFN32-5x5
5 mm x 5 mm x 0.9 mm
BLOCK DIAGRAM
+3.5..5.5V
C1
1μF
iC-PT
PA
NA
PB
NB
PZ
NZ
POWER-ON RESET
TIP
TIN
SEL
LED
POWER
CONTROL
VCC
LED
PA
NA
PB
NB
PZ
D1
R1
47
SIGNAL
COMPARATION
AND
QUADRATURE
OUTPUT
INDEX
OUTPUT
NZ
U
U
V
W
W
COMMUTATION
GND
-
+
V
Copyright © 2011 iC-Haus
http://www.ichaus.com
iC-PT 3324
preliminar y
Rev A6, Page 2/9
6-CH. PHASED ARRAY OPTO ENCODER (33-1024)
DESCRIPTION
iC-PT 3324 is an optical sensor IC with integrated
photosensors whose signals are converted into volt-
ages by low-noise transimpedance amplifiers. Pre-
cise voltage comparators with hysteresis are used to
generate the digital signals, supplied to the output
pins via differential +/- 4 mA push-pull drivers.
The built-in LED power control with its 40 mA driver
stage permits a direct connection of the encoder
LED. Regardless of aging or changes in temperature
the received optical power is kept constant. An exter-
nal resistor presets the photocurrent operating point
and thus the desired illumination level.
Selection input SEL chooses for three different op-
erating modes: regular A/B operation, A/B operation
with 2-fold interpolation, or analog operation. With
analog operation the amplified signal voltages are
available at the outputs for inspection and monitoring
encoder assembly.
Typical applications of iC-PT devices are incremental
encoders for motor feedback and commutation. To
this end, device version iC-PT 3324 provides differ-
ential A/B tracks and a differential index track, each
consisting of multiple photo sensors. The layout of
the signal amplifiers is such that there is an excellent
paired channel matching, eliminating the needs for
signal calibration in most cases.
Additionally, three more tracks are provided to gener-
ate motor commutation information for the U, V and
W outputs, for instance with 120 degree phase shift
to operate 3-phase brushless motors (period count
and phase shift can be varied by the code disc ap-
plied).
iC-PT 3324
preliminar y
Rev A6, Page 3/9
6-CH. PHASED ARRAY OPTO ENCODER (33-1024)
PACKAGES
PAD LAYOUT
Chip size 2.88 mm x 3.37 mm
PAD FUNCTIONS
No. Name Function
See pin configuration.
PIN CONFIGURATION
oQFN32-5x5 (5 mm x 5 mm)
PIN FUNCTIONS
No.
Name Function
1 VCC
2 LED
+3.5..5.5 V Supply Voltage
LED Controller, High-Side Current
Source Output
Push-Pull Output A+ / Test Sig. Sin+
Push-Pull Output A- / Test Sig. Sin-
Push-Pull Output B+ / Test Sig. Cos+
Push-Pull Output B- / Test Sig. Cos-
Push-Pull Output Z+ / Test Signal Z+
Push-Pull Output Z- / Test Signal Z-
Op. Mode Selection Input:
lo = digital
hi = x2 interpolated
open = analog (alignment aid)
Push-Pull Output W / Test Signal W
Negative Test Current Input
Push-Pull Output V / Test Signal V
Positive Test Current Input
Push-Pull Output U / Test Signal U
Ground
Backside Paddle
32 31 30 29 28 27 26 25
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16
24
23
22
21
20
19
18
17
3
4
5
6
7
8
9..16
17
PA
NA
PB
NB
PZ
NZ
n.c.
SEL
18
19
20
21
22
23
24
25..32
W
TIN
V
TIP
U
n.c.
GND
n.c.
BP
Pin numbers marked n.c. are not in use. The backside paddle is not intended as an electrical connection point;
when used as shield a single link to GND is permissible. The test pins TIP and TIN may remain unconnected.
Capacitive pin loads must be avoided when using the analog test signals for alignment purposes.
iC-PT 3324
preliminar y
Rev A6, Page 4/9
6-CH. PHASED ARRAY OPTO ENCODER (33-1024)
PACKAGE DIMENSIONS
RECOMMENDED PCB-FOOTPRINT
4.90
3.60
15
R0.
0.30
SIDE
4.90
0.90
3.60
0.50
0.30
TOP
5
1.90
BOTTOM
3.60
3.24
0.50
0.23
dra_pt33xx-oqfn32-2_pack_1, 10:1
Maximum molding excess +20 µm / -200 µm versus surface of glass.
All dimensions given in mm.
0.40
3.60
5
0.70
iC-PT 3324
preliminar y
Rev A6, Page 5/9
6-CH. PHASED ARRAY OPTO ENCODER (33-1024)
ABSOLUTE MAXIMUM RATINGS
These ratings do not imply operating conditions; functional operation is not guaranteed. Beyond these ratings device damage may occur.
Item
No.
Symbol
Parameter
Supply Voltage
Current in VCC
Voltage at Output Pins
PA, NA, PB, NB, PZ, NZ, U, V, W
Current in Output Pins
PA, NA, PB, NB, PZ, NZ, U, V, W
Voltage at LED
Current in LED
Voltage at TIP, TIN, SEL
Current in TIP, TIN, SEL
ESD Susceptibility, all pins
Junction Temperature
Chip-Storage Temperature Range
HBM, 100 pF discharged through 1.5 kΩ
-40
-40
Conditions
Min.
-0.3
-20
-0.3
-20
-0.3
-120
-0.3
-20
Max.
6
20
VCC +
0.3
20
VCC +
0.3
20
VCC +
0.3
20
2
150
150
V
mA
V
mA
V
mA
V
mA
kV
°C
°C
Unit
G001 VCC
G002 I(VCC)
G003 V()
G004 I()
G005 V()
G006 I()
G007 V()
G008 I()
G009 Vd()
G010 Tj
G011 Ts
THERMAL DATA
Item
No.
T01
T02
T03
Symbol
Ta
Ts
Tpk
Parameter
Operating Ambient Temperature Range
(extended range on request)
Permissible Storage Temperature
Range
Soldering Peak Temperature
tpk < 20 s, convection reflow
tpk < 20 s, vapor phase soldering
MSL 5A (max. floor live 24 h at 30 °C and
60 % RH);
Please refer to customer information file No. 7
for details.
Conditions
Min.
-40
-40
Typ.
Max.
85
85
245
230
°C
°C
°C
°C
Unit
All voltages are referenced to ground unless otherwise stated.
All currents flowing into the device pins are positive; all currents flowing out of the device pins are negative.
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