Silan
Semiconductors
SC91650/1/2 A/B
STATE NO.
(0) INITIAL STATE
(1) ON HKS HF LINE
(2) OFF HKS LINE
(3) OFF HKS HF LINE
(3) OFF HKS HD LINE
(3) ON HKS HD LINE
PO
XMUTE HFO
0/F
F
0
1/F
F
1
1/F
F
0
1/F
F
1
1/F
0
0
1/F
0
0
HDO
0
0
0
0
1
1
ON/OFF: ON/OFF HKS
HF: Depress HF key
HD: Depress HF key
F: Floating (Hi-impedance)
PO is floating for SC91651/
SC91652 open drain
struc-ture.
TEST CIRCUIT
1 Operation
V+
current
A
2 Standby V+
current
A
VDD
DP
keyboard
MODE
DP
HKS VSS
DT
VDD
HKS
VSS
3 Tone output voltage
V+
keyboard
VDD
VSS
TONE
HKS
counter
and
AC meter
10KΩ
4 Tone distortion
V+
keyboard
VDD
VSS
TONE
HKS
Spectrum
analyzer
V 10KΩ
5 Pulse output sink current
(open drain structure)
V+
Flash
key
VDD
PO
VSS HKS
A
VEXT
V
6 Pulse output sink current
(inverter structure)
V+
VDD
HKS
PO
VSS
A
V
VEXT
7 Keypad input current (row group)
V+
A
VDD
R*
ROW
C*
HKS VSS MODE
8 keypad input current (column group)
V+
VDD
R*
COLUMN
C*
A
HKS VSS MODE
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
REV: 1.0
2001.01.15
16