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DAC (UPD6376CX)
UPD6376CX is a two-channel 16-bit Digital to Analog Convertor consisting of resistor string, output
amplifier and zero offset circuit.
Pin No.
Terminal
In/Out
1
SEL
2
D.GND
3
NC
4
DVDD
5
A.GND
6
R.OUT
7
A.VDD
8
A.VDD
9
R.REF
10
L.REF
11
L.OUT
12
A.GND
13
LRCK
14
LRSEL
15
SI
16
CLK
Key Touch LSI (HG52E35P)
By counting the time between first-key input signal FI and second-key SI from the keyboard unit, the key
touch LSI detects key velocity of 256-step. Then the LSI sends the CPU the note number and its velocity
data.
RD
APO
WR
CLOCK
A12
A14
RESET
Data bus
Address bus
In
Mode selection terminal. Connected to ground.
In
Ground (0 V) source for internal digital circuit
Not used
In
+5 V source for internal digital circuit
In
Ground (0 V) source for internal analog circuit
Out
Right channel sound waveform output
In
+5 V source for internal analog circuit
In
+5 V source for internal analog circuit
In
Reference voltage terminal. Connected to a capacitor.
In
Reference voltage terminal. Connected to a capacitor.
Out
Left channel sound waveform output
In
Ground (0 V) source for internal analog circuit
In
Word clock (L/R separation signal) input.
In
Not used. Connected to ground.
In
Sound data input
In
Bit clock input
Key touch LSI
LSI106
HG52E35P
CRDB
CWRB
CKI
CCSB
RESB
CD0
CD7
CA0 ~ CA2
— 8 —
Function
KC0
Key scan signal
KC7
FI0
SI0
Key input signal
FI7
SI7
Keyboard
KC
First contact
FI
SI
Second contact
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