HT12M
2
12
Decoder Doorbell
Block Diagram
Pin Assignment
Rev. 1.00
1
March 25, 2002
Features
Operating voltage: 2.4V~5.0V
Built-in AMP
2channel dual tone generator
One Pin oscillator
Current type D/A Output
HT12E encoder pair with
Tone optional: Ding-Dong/Westminster tunes
16-pin DIP package
General Description
The main application area for the HT12M device is for
remote control doorbells working together with HT12E.
Containing all the functions of the Holtek HT12D de-
coder and with an added amplifier and melody genera-
tor, the device eliminates the need for customers to
incorporate an external op-amp and melody generator
IC within their product applications, in the process sig-
nificantly reducing overall product costs.
In addition to being fully compatible with the HT12D cir-
cuitry, the device includes the following features; inter-
nal Inverting AMP with can also operate as standard
independent inverter, internal 2 channel tone generator
and current type Audio output.
O S C I
A M P
V D D
V S S
B U S Y
A U D
O s c i l l a t o r
C i r c u i t
A M P
C i r c u i t
D I N
D i v i d e r
C o m p a r a t o r
T o n e
G e n e r a t o r
C o n t r o l
C i i r c u i t
A d d r e s s
C i r c u i t
A 0
A 7
T E S T
1 6
1 5
1 4
1 3
1 2
1 1
1 0
9
1
2
3
4
5
6
7
8
A 0
A 1
A 2
A 3
A 4
A 5
A 6
A 7
V D D
T E S T
V T
O S C I
A M P
D I N
A U D
V S S
H T 1 2 M
1 6 D I P - A
Pad Assignment
Pad Coordinates
Unit:
mm
Pad No.
X
Y
1
-610.00
701.90
2
-622.00
461.60
3
-622.00
350.60
4
-622.00
239.70
5
-616.00
-695.20
6
-502.00
-695.20
7
-388.50
-687.70
8
-87.95
-647.80
9
575.80
172.40
10
575.80
444.20
11
308.30
660.40
12
22.10
635.90
13
-122.40
638.40
14
-270.40
701.90
15
-384.50
701.90
16
-495.50
701.90
Chip Size: 1530
1690 mm
* The IC substrate should be connected to VSS in the PCB layout artwork.
Pin Description
Pin No.
Pin Name
I/O
Internal Connection
Description
1~8
A0~A7
I
NMOS
Open Drain
Address pin.
9
VSS
Negative power supply, ground
10
AUD
O
PMOS
Open Drain
Audio out
11
DIN
I
COMS In
Serial data input
12
AMP
O
CMOS
Amp feed back
13
OSCI
I
Oscillator input pin.
14
VT
O
CMOS
Busy, data valid
15
TEST
I
CMOS In
Test pin.
16
VDD
Positive power supply
Absolute Maximum Ratings
Supply Voltage ........................................
-0.3V to 5.5V
Storage Temperature ...........................
-50C to 125C
Input Voltage .............................V
SS
-0
.
3V to V
DD
+0.3V
Operating Temperature ..........................
-25C to 70C
Note: These are stress ratings only. Stresses exceeding the range specified under
Absolute Maximum Ratings may
cause substantial damage to the device. Functional operation of this device at other conditions beyond those
listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliabil-
ity.
HT12M
Rev. 1.00
2
March 25, 2002
( 0 , 0 )
1
2
3
4
5
1 6
6
7
8
A 6 A 7 V S S
A U D
1 0
9
A M P
D I N
O
S
C
I
V
T
T
E
S
T
V
D
D
A
0
A
1
1 5 1 4
1 3
1 2
1 1
A 2
A 3
A 4
A 5
D.C. Characteristics
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
DD
Conditions
V
DD
Operating Voltage
2.4
5
V
I
STB
Standby Current
5V
OSC stop amp off
0.1
1
mA
5V
OSC stop amp on
10
20
mA
I
DD
Operating Current
5V
No load
f
OSC
=150kHz
1.5
2
mA
I
AUD
AUD output current
5V
Transistor B load
3
5
mA
I
VT
VT Output Source Current
5V
V
OH
=4.5V
-2
-3
mA
VT Output Sink Current
5V
V
OL
=0.5V
2
3
mA
V
IH
High Input Voltage
5V
3.5
5
V
V
IL
Low Input Voltage
5V
0
1
V
f
OSC
Oscillator Frequency
5V
ROSC=820k
W
190
kHz
HT12M
Rev. 1.00
3
March 25, 2002
Functional Description
Built-in inverter amp
Trigger mode
Single tone has 4 second total length, dual tone has 1
second total length.
A M P
D a t a O u t
R . I n p u t
V T
O n e - s h o t
O n e - s h o t
T w i c e
W e s t m i n s t e s
t u r e
1 s e c
3 s e c
3 . 2 s e c
The Ding-Dong sound: is determined by the D8~D11 pins on the HT12E. While the Re-trigger/Non-trigger function is
determined by the D11 pin on the HT12E.
D11
D10
D9
D8
Sound
Notes
1
0
0
0
Me
1
2
0
0
1
Me Do
2
3
0
1
0
Me Do
Me Do
Repeat
4
0
1
1
Me/Do
Single tone
5
1
0
0
Me Do Re So
So Re Me Do
Westminster tune
6
1
0
1
Me/Do Do/So
Double tone
7
1
1
0
So Re Me Do
4
8
1
1
1
Me/Do Do/So
Me/Do Do/So
Dual Tone-repeat
Section time: 0.8secretary
2 = 1.6sec
Application Circuit
HT12E/HT12M pairing application circuit
Using internal OP amplifier circuit
HT12M
Rev. 1.00
4
March 25, 2002
T r a n s m i t t e r C i r c u i t
H T 1 2 E
R e c e i v e r C i r c u i t
H T 1 2 M
A d d r e s s
D a t a
A d d r e s s
V
D D
H T 1 2 M
A 0
A 1
A 2
A 3
A 4
A 5
A 6
A 7
1
2
3
4
5
6
7
8
T E S T
O S C I
V S S
V D D
V T
A U D
V
D D
D I N
A M P
C 9 4 5
R .
A N T E N N A
Using external OP amplifier circuit
Typical RF-Receiver circuit
HT12M
Rev. 1.00
5
March 25, 2002
V
D D
7 p .
3 p .
1 8 1 5
6 . 8
2 0 2
2 0 2
3 9 p .
2 0 2
R . - O U T
H T 1 2 M
A 0
A 1
A 2
A 3
A 4
A 5
A 6
A 7
1
2
3
4
5
6
7
8
T E S T
O S C I
V S S
V D D
V T
A U D
V
D D
D I N
A M P
R .
A N T E N N A
O P A m p
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