510
HA16603P/FP
Contactless Switch
Description
The HA16603P is an IC for use with metal proximity switches. It can be used for the coin sensor circuit in
vending machines and similar microprocessor sensors.
Features
Two proximity switch channels
The input and output pins are arranged in pairs for convenient printed circuit board mounting.
Wide operating power-supply voltage range: 4.75 to 30 V
Low power with a dissipation current of only 2.5 mA
Normal and inverted outputs can be acquired at the same time.
The outputs is available for current-source drive only since the internal circuits are NPN transistors with
open emitter outputs.
Pin Arrangement
HA16603P/FP
511
Block Diagram
HA16603P/FP
512
Absolute Maximum Ratings (Ta = 25C)
Item
Symbol
Rated Value
Unit
Operating power-supply voltage range
V
CC
4.75 to 30
V
Output voltage
Vout
0 to V
CC
V
Hysteresis pin voltage
V
11
, V
14
0 to V
CC
V
Sensor pin voltage
V
9
, V
16
1.3 to +2.0
V
Sensitivity pin voltage
V
12
, V
13
0.65 to +2.0
V
Capacitor pin voltage
V
4
, V
6
0 to +2.0
V
Output source current
I
o(source)
7 to 0
mA
Hysteresis pin sink current
I
11
, I
14
(sink)
0 to +1.0
mA
Sensitivity pin source current
I
12
, I
13
(source)
5 to +0.1
mA
Sensor pin source current
I
9
, I
16
(source)
1.0 to 0
mA
Capacitor pin sink current
I
4
, I
6 (sink)
0 to +5.0
mA
Allowable power dissipation*
P
T
625
mW
Capacitor pin source current
I
4
, I
6
(source)
320 to 0
A
Operating temperature
Topr
25 to +85
C
Storage temperature
Tstg
40 to +125
C
Note:
When multiple maximum ratings apply to the same pin, the rating that corresponds to the
smallest stress is the valid rating.
*
See page 51.
HA16603P/FP
513
Electrical Characteristics (V
CC
= 24 V, Ta = 25C)
Item
Symbol Min
Typ
Max
Unit
Test Condition
Dissipation current
I
Q
--
2.5
6.0
mA
Sensor 1 and sensor 2: ground,
V
CC
= 30 V, sensitivity 1 and sensitivity
2: 10 k to ground
Output saturation
V
O(sat)
--
--
1.0
V
(V
CC
V
out
)
Ta = 25C
voltage
--
--
1.1
V
I
O(source)
= +7 mA
Ta = 25C
Output leakage
I
O(leak)
600
--
--
nA
V
CC
= 30 V
Ta = 25C
current
40
--
--
A
Ta = 85C
Hysteresis pin internal
resistance (on state)
r
CS
--
--
260
I
11
, I
14
(sink)
= 500 A
Hysteresis pin
leakage current
I
11
, I
14
(leak)
--
--
1
A
V
CC
= 30 V
Oscillator frequency
f
OSC
--
--
1,000
kHz
HA16603P/FP
514
HA16603P/FP
515
Notes
(1) An air-core coil must be used as the sensor coil.
(2) This IC has 3 ground pins. All three ground pins must be connected to ground, even if only one channel
is used.
(3) If the sensitivity is set too high for a sensor coil with bad temperature characteristics, the operating
temperature range may become narrow. The operating temperature range for the whole system,
including the sensor coil, can be expanded by holding down the sensitivity.
Sample Recommended Operating Circuit
HA16603P/FP
516
The oscillator frequency is determined by the following formula.
The tank circuit formed by L and C0 has characteristic impedance shown in the figure. The condition for
oscillation for the HA16603P is Rd 1/g, and the condition for oscillation to stop is Rd > 1/g.
When Rd
is connected to the hysteresis pin, (Rd + r
cs
// Rh) 1/g is the condition for oscillation to start,
and (Rd + Rh) > 1/g is the condition for oscillation to stop. Note that r
cs
is the internal resistance of the
hysteresis pin.
The relationship between oscillation occurring or not and the detection of a metallic object is as follows:
Oscillation occurs: When no metallic object is detected (i.e. the sensor coil and the metallic object are
separated)
Oscillation stops: When a metallic object is detected (i.e. the metallic object is near the sensor coil)
Setting the Detection Distance
Since the detection distance depends on the Q of the sensor coil and the shape, surface area, thickness, and
material of the metallic object, it can only be set by testing the completed system. Note that Rd sets the
detection distance.
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