EM91401 Ver la hoja de datos (PDF) - ELAN Microelectronics
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EM91401
ELAN Microelectronics
EM91401 Datasheet PDF : 23 Pages
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EM91401 SERIES
TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE
AND DUAL-TONE MELODY GENERATOR
Preliminary
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 EM32100 (or EM32116
). 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
1
bit 0
bit1
bit2 bit3 bit4
bit5
ready
start bits
data bits
0
1
stop bits
SDO Keypad Encoded table:
♦ Digital key (b5,b4=0,0)
keypad
1 2 34 5 6
output
b3,b2,b1,b0 0001 0010 0011 0100 0101 0110
Display
1 2 34 5 6
789
0111 1000 1001
789
0 “*”/T
1010 1011
0
# P */”T”
1100 1101 1110
P
♦ Function key (b5,b4=1,0)
keypad
F
output
b3,b2,b1,b0
1111
Display
clear all display
∗ Keypad,SDO format and LCD display reference table:
Keypad
1
2
3
4
5
6
7
8
9
0
“*”/T
#
P
*/”T”
F
bit5
bit4 bit3
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
1
0
1
bit2 bit1
0
0
0
1
0
1
1
0
1
0
1
1
1
1
0
0
0
0
0
1
0
1
1
0
1
0
1
1
1
1
bit0
Display
1
1
0
2
1
3
0
4
1
5
0
6
1
7
0
8
1
9
0
0
1
0
1
P
0
1
clear all display
LOCK function
The EM91401 serial provides the LOCK function to inhibit toll dialing operation. Connecting a resistor on COL1
* This specification are subject to be changed without notice.
10.1.1997 8
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