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PDF HT3494 Data sheet ( Hoja de datos )
| Número de pieza | HT3494 | |
| Descripción | Multi-Function Keyboard Instrument | |
| Fabricantes | Holtek | |
| Logotipo |  |
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HT3494
Multi-Function Keyboard Instrument
Features
• Operating voltage: 3.3V~5.1V
• On-chip crystal oscillator: 3.58MHz
• 49-key instrument and compass range from
C2~C6
• 15 outputs for key scanning
• 8 inputs for key scanning
• 32 percussion/voice space for rhythm pro-
gramming
• 100 timbers
• 100 rhythms
• 5 percussions/voices
• 10 melodies
• 8-bit D/A audio outputs
• 4 percussion/voice channels output
• 8 melody channels output
General Description
The HT3494 is a CMOS VLSI designed for mu-
sical instruments, especially 49-key multi-func-
tion instruments. The HT3494 is built-in with a
controller and an ETS (Electrical Tone Synthe-
sizer).
The HT3494 provides built-in melodies,
rhythms, timbers and percussion/voice outputs.
• Tempo adjustable
• Memory function with 26 notes recordable
• Auto-bass-chord function
• Transpose function
• 5-chord effect
• Vibrato function
• Sustain effect
• Fill-in effect
• Chord with single or multi-keys pressed
• Chord with a key synchronously pressed
• 2 seven-segment LEDs to display operation
status
• Indicator for chord operation
• 40 DIP enclosed
The status of operating system is displayed
through 2 seven-segment LEDs.
The HT3494 also provides an auto-bass-chord
function, memory function as well as program-
mable rhythm in addition to basic playing func-
tions.
1 15 Aug ’96
Free Datasheet http://www.datasheet4u.com/
1 page  
HT3494
Electrical Characteristics
Symbol
Parameter
VDD
IDD
IAUO
IPVO
IOL
IOH
IIL
FOSC
Operating Voltage
Operating Current
Max. Output Current
(for AUO1, AUO2 Pin)
Max. Output Current
(for PVO Pin)
Output Sink Current
(for C1~C15, CLED)
Output Source Current
(for C1~C15, CLED)
Input Current (for R0~R7)
System Frequency
Test Condition
VDD
Condition
——
4.5V
No load,
FOSC=3.58MHz
4.5 VOH=0.6V
4.5V VOH=0.6V
4.5V VOL=0.45V
4.5V VOH=4.05V
4.5V
4.5V
VIL=0V
3.58MHz crystal
oscillator
(Ta=25°C)
Min. Typ. Max. Unit
3.3 4.5 5.1
V
— 3.5 7.0 mA
–540 –900 — µA
–540 –900 — µA
3.4 5.6 — mA
–2.7 –4.6 — mA
80 130 325 µA
— 3.58 — MHz
Functional Description
The functions of the HT3494 are described in the following:
Initial status
When power is initially supplied, the system starts operating. The beginning status of the system is
illustrated below:
• No tone or percussion/voice is stored
• Normal play mode
• Timber is number 0 (Piano 1)
• Rhythm is number 0 (Rhumba 1)
• Chord off
• First chord (Cho1) is ready for playing
• Percussion sound is ready for playing
• No transposition
• Tempo is 120 bpm
• Accompaniment is level 2 (–3dB, display “02”)
• Vibrato off
• Sustain disable
5 15 Aug ’96
Free Datasheet http://www.datasheet4u.com/
5 Page 
HT3494
Demo song
Melody
Name
d0 Merry Widow Waltz
d1
Have Yourself A Merry Little
Christmas
d2 Twinkle Twinkle Little Star
d3 Rudolph the Red-nosed Reindeer
d4 Air on the G-string
d5 If You are Happy
d6 Young Girl with Brown Hair
d7 The Christmas Song
d8 Oh! Susannah
d9 Waltzing Doll
Rhythm
Timber
Waltz 1 Violin 1
Tempo (bpm)
152
Disco 1 Piano 1
120
Pops 1
Synth Xylophone
Polka 5 Harp
Country 1 Synth Organ 1
Latin 1 Synth Piano 2
Waltz 1 Organ 1
Pops 1
Synth Piano 1
March 1 Electronic Mandolin
Waltz 1 Xylophone
104
152
88
120
88
104
96
136
After the Demo key is pressed, the LED dis-
plays “
” , and the first melody starts
playing. To change melody playing, press any
digital key corresponding to one of the 10 melo-
dies at any time. The system will stop playing
and quit the demo mode if the 10 melodies are
all played but no key is pressed.
If the Demo key is pressed in the process of
playing, the system will quit the demo mode,
and goes back to the normal playing mode. The
tempo, accompaniment and timber can be
changed or transposed at any time in the proc-
ess of melody playing. Notice to change the
timber, presses “+” or “–” key.
Tempos
There are 31 speeds to be selected, namely
40~280 bpm (beat per minute), and the normal
speed is 120bpm.
Pressing the Tmpo+ key increases the speed
whereas pressing the Tmpo– reduces it until
the maximum or minimum speed value is
reached.
When Tmpo+ and Tmpo– are simultaneously
pressed, the value of tempo is reset to 120 bpm.
If the tempo is adjusted by Tmpo+ and Tmpo–,
the LED will display the tempo currently set.
Display Value
Real Tempo
(bpm)
Display Value
Real Tempo
(bpm)
Display Value
Real Tempo
(bpm)
10 40 32 128 54 216
12 48 34 136 56 224
14 56 36 144 58 232
16 64 38 152 60 240
18 72 40 160 62 248
20 80 42 168 64 256
22 88 44 176 66 264
24 96 46 184 68 272
26 104 48 192 70 280
28 112 50 200
30 120 52 208
11 15 Aug ’96
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet HT3494.PDF ] | |
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