Onkyo TX-8255 Service Manual page 28

IC BLOCK DIAGRAMS AND DESCRIPTIONS
TA7291S(Volume motor driver)
Vcc Vref
2 8
REGU-
LATOR
PROTECTOR
9 1
IN1 IN2
TC9273CNG(Analog Switch Array)
V
SS
1
S1 2
S2 3
S3 4
S4 5 (L-ch)
S5
6
10bit
S6
7
Latch
S7
8
S8
9
Circuit
S9
10
S10
11
S11
12
LEVEL SHIFTER+SHIFT REGISTER
CIRCUIT
13 14 15
GND CK DATA
5
GND
V
DD
28
Pin No.
27
S1
(R-ch)
26
S2
10bit
25
S3
24 S4
Latch
2/27
S5
23
3/26
Circuit
S6
22
4/25
(Same S7
21
5/24
6/23
S8
20
as L-ch
7/22
S9
19
8/21
Circuit)
S10
18
9/20
S11
17
10/19
11/18
12/17
16
STB
INPUT
IN1
0
6
Vss
1
0
1
7
OUT1
3
OUT2
Symbol Description
1 Vss Negative power supply pin
13 GND Digital ground pin
28 VDD Positive power supply pin
S1
S2
S3
S4
S5
Input/Output pins
S6
S7
S8
S9
S10
S11
14 CK Clock input pin for data transfer.
15 DATA Serial data input pin for setting switches.
16 STB Strobe input pin for data writing.
OUTPUT
MODE
IN2 OUT1 OUT2
0
0 H L CW/CCW
1 L H CCW/CW
1 L L BRAKE
CCW: Counter-clockwise
CW: Clockwise
TX-8222
STOP