EM91455 Ver la hoja de datos (PDF) - ELAN Microelectronics
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EM91455 Datasheet PDF : 24 Pages
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EM91455 SERIES
TONE/PULSE DIALER WITH LCD INTERFACE
AND I.P.P. DETECT FUNCTION
Operating flow chart
HF
HF
HF
XMUTE =Hi
(1)
On-hook State
XMUTE=Lo
HKS=Lo
HKS=Hi
(7)
IPP State
HKS=Lo
(4)
On-hook
Hand-free State
HKS=Lo
(2)
Off-hook State
HKS=Hi
(3)
Off-hook
HF
HF
HD
HD
HF
Hand-free State
HD
(6)
HD
On-hook
Hold-line State
HKS=Hi
HF
HD
(5)
Of f-hook
Hold-line State
HKS=Lo
<Note> : HF = Handfree
HD = Hold
Truth table
Operating state
(1) On-hook, idle state
(2) Off-hook line
Input
HKS
H
L
I/O
XMUTE
H/F
H/F
Pin level
PO
F
F
Output
HFO
L
L
HDO
L
L
DTMF
-
-
(3) Off-hook, HF line
L
H/F
F
H
L
-
(4) On-hook, HF line
H
H/F
F
H
L
-
(5) Off-hook, HD line
L
L/L
F
L
H
-
(6) On-hook, HD line
H
L/L
F
L
H
-
(7) IPP state
H
L/L
F
H
H
active
Note : F=floating (high impedance); H=logic “High”; L=logic “Low” level.
XMUTE are I/O port, so Input will effect state situation change, and which state dialer stay will
effect output level.
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 EM32117
). The SDO signal consists of two start bits, six data bits and two stop bits. The 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
* This specification are subject to be changed without notice.
0
1
stop bits
9.24.1998 8
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