RE46C100
Piezoelectric Horn Driver Circuit
Features:
•
•
•
•
Low Quiescent Current (< 100 nA)
Low Driver R
ON
– 20typical at 9V
Wide Operating Voltage Range
Available in 8-pin DFN, PDIP and SOIC packages
Package Types
RE46C100
PDIP, SOIC
NC
V
DD
NC
FEED
1
2
3
4
8
7
6
5
HRNEN
HORNS
HORNB
V
SS
General Description:
The RE46C100 devices are intended for applications
using a self oscillating piezoelectric horn, although it
can be used in direct drive applications. Feedback
control and a driver circuit are provided, as well as a
horn enable function.
The RE46C100 is intended for use in smoke detectors,
CO detectors, personal security products and
electronic toys.
RE46C100
2x3 DFN*
NC 1
V
DD
2
NC 3
FEED 4
EP
9
8 HRNEN
7 HORNS
6 HORNB
5 V
SS
*
Includes Exposed Thermal Pad (EP); see
Table 2-1.
Functional Block Diagram
4 FEED
HRNEN 8
V
DD
V
SS
2
5
7
HORNS
6
HORNB
2009-2014 Microchip Technology Inc.
DS20002166B-page 1
RE46C100
Typical Application
Horn Enable
Active High
1
2
+
9V
Battery -
C2
1 µF
(1)
8
7
RE46C100
3
4
6
5
R3
R4
C1
1.5
MΩ
220
kΩ
0.001 µF
Note 1:
Place C2 close to the device power pins to minimize horn switching noise.
DS20002166B-page 2
2009-2014 Microchip Technology Inc.
RE46C100
1.0
ELECTRICAL
CHARACTERISTICS
† Notice:
Stresses above those listed under “Maximum
ratings” may cause permanent damage to the device.
This is a stress rating only and functional operation of
the device at these or any other conditions above those
indicated in the operation listings of this specification is
not implied. Exposure to maximum rating conditions for
extended periods may affect device reliability.
Absolute Maximum Ratings†
Supply Voltage.............................................................. V
DD
= 18V
Input Voltage Range Except FEED, TEST....... V
IN
= -0.3V to V
DD
+ 0.3V
FEED Input Voltage Range ........................... V
INFD
=-10 to +22V
Input Current except FEED ......................................... I
IN
= 10 mA
Operating Temperature......................................T
A
= -40 to +85°C
Storage Temperature ...................................T
STG
= -55 to +125°C
Maximum Junction Temperature ............................... T
J
= +150°C
DC ELECTRICAL CHARACTERISTICS
DC Electrical Characteristics:
Unless otherwise indicated, all parameters apply at T
A
= +25°C, V
DD
= 9V,
Typical Application.
Parameter
Supply Voltage
Supply Current
Input Voltage Low
Input Voltage High
Input Leakage Low
Input Leakage High
Output Voltage Low
Output Voltage High
Symbol
V
DD
I
DD1
V
IL1
V
IH1
I
IL1
I
LFD
I
IH1
I
HFD
V
OL1
V
OL2
V
OH1
V
OH2
Test
Pin
2
2
8
8
8
4
8
4
6, 7
6, 7
6, 7
6, 7
Min.
6
—
—
2.3
—
—
—
—
—
—
8.5
6.3
Typ.
9
—
—
—
—
—
—
—
0.3
—
8.7
—
Max.
16
100
1
—
-100
-50
100
50
0.5
0.9
—
—
Units
V
nA
V
V
nA
µA
nA
µA
V
V
V
V
V
IN
= V
SS
FEED = -10V
V
IN
= V
DD
FEED = 22V
I
OL
= 16 mA
I
OL
= 16 mA, V
DD
= 7.2V
I
OH
= -16 mA
I
OH
= -16 mA, V
DD
= 7.2V
Conditions
Operating
HRNEN = 0V, FEED = 0V
TEMPERATURE SPECIFICATIONS
Electrical Specifications:
Unless otherwise indicated, all parameters apply at T
A
= +25°C, V
DD
= 9V,
Typical Application.
Parameters
Temperature Ranges
Operating Temperature Range
Storage Temperature Range
Thermal Package Resistances
Thermal Resistance, 8L 2x3 DFN
Thermal Resistance, 8L-PDIP
Thermal Resistance, 8L-SOIC
θ
JA
θ
JA
θ
JA
—
—
—
75
89.3
149.5
—
—
—
°C/W
°C/W
°C/W
T
A
T
STG
-40
-55
—
—
+85
+125
°C
°C
Sym.
Min.
Typ.
Max.
Units
Conditions
2009-2014 Microchip Technology Inc.
DS20002166B-page 3
RE46C100
2.0
PIN DESCRIPTIONS
PIN FUNCTION TABLE
Symbol
NC
V
DD
NC
FEED
V
SS
No connection
Connect to the positive supply voltage
No connection
Usually connected to the feedback electrode through a current-limiting resistor.
If not used, this pin must be connected to V
DD
or V
SS
.
Connect to the negative supply voltage
Description
The descriptions of the pins are listed in
Table 2-1.
TABLE 2-1:
RE46C100 RE46C100
PDIP, SOIC
DFN
1
2
3
4
5
6
7
8
—
1
2
3
4
5
6
7
8
9
HORNB This pin is connected to the metal electrode of a piezoelectric transducer.
HORNS This pin is a complementary output to HORNB, connected to the ceramic
electrode of the piezoelectric transducer.
HRNEN This pin enables the horn with a logic high.
EP
Exposed thermal pad. This pad should be connected to V
SS
.
DS20002166B-page 4
2009-2014 Microchip Technology Inc.
RE46C100
3.0
DEVICE DESCRIPTION
The RE46C100 horn driver provides the circuitry
necessary to drive a three-terminal self-oscillating
piezoelectric horn. It can also drive a two-terminal
piezoelectric horn with the FEED pin used as a signal
input. The horn driver provides a push-pull circuit to
drive the horn, as shown in the
Typical Application
circuit.
In a self-oscillating application, the FEED pin is
connected to the feedback pin of the piezoelectric horn
through a resistor. To drive a two-terminal piezoelectric
horn with an external signal, the FEED pin should be
used as the external signal input. The horn is enabled
when HRNEN is driven to a logic high and is silenced
when HRNEN is driven to a logic low. The horn output
can be modulated using the HRNEN input.
2009-2014 Microchip Technology Inc.
DS20002166B-page 5
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