SC91415AP SILAN [Silan Microelectronics Joint-stock], SC91415AP Datasheet - Page 12

• Manufacturer Part Number: SC91415AP
• Description: TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE AND DUAL-TONE MELODY
• Manufacturer: SILAN [Silan Microelectronics Joint-stock]

Truth table
Note : F = floating (high impedance); H = logic “High”; L = logic “Low” level.
G) Music on Hold
SC91415 series built-in a melody generator to generate dual-tone music on DTMF output pin. The music is designed
for telephone line at line holding.
H) SDO (Serial Data Output) function
The SDO is serial data output which format is same as UART protocol. SDO function is designed to drive LCD driver
and voice synthesizer. So the dialing numbers can be display on LCD screen with SC32100 (or SC32116). The SDO
signal consists of two start bits, six data bits and two stop bits. Each bit time is about 3.9 ms (256 Hz) and output
sequences are following by start bits, data bits (LSB to MSB) and stop bits.
(0) on-hook, idle state
(1) Off-hook line
(2) Off-hook, HF line
(3) On-hook, HF line
(4) Off-hook, HD line
(5) On-hook, HD line
ready
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Silan
Semiconductors
start bits
0
1
HKS
H
H
H
L
L
L
bit0
bit1
PO
F
F
F
F
F
F
bit2
12
data bits
bit3
XMUTE
F
F
F
F
L
L
bit4
bit5
HFO
H
H
L
L
L
L
0
Rev: 2.0
stop bits
1
HDO
2001-11-13
H
H
L
L
L
L