EM91810A データシートの表示（PDF） - ELAN Microelectronics
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コンポーネント説明
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EM91810A
ELAN Microelectronics
EM91810A Datasheet PDF : 18 Pages
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EM91810A/B
TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE
Handfree function operation:
A). To execute Handfree function : When HFO = "low", HFI pin is active , the Handfree function will be
enabled (HFO="HIGH").
B). Reset Handfree function:
a. OFF-HOOK action.
b. When HFO="high", a HFI pin is active again , the Handfree function will be reset (HFO="LOW").
Operating flow chart of Handfree
ON HKS
INITIAL (0)
OFF
HF
HF
ON
ON
HF
HKS
LINE
(1)
ON
OFF
HF
OFF HKS
HF LINE
(3)
OFF HKS
(2)
HF
STATE NO. PO
(0) INITIAL STATE
F
(1) ON HKS HF LINE
F
(2) OFF HKS LINE
F
(3) OFF HKS HF LINE
F
* F : Floating (Hi-impedance)
SDO (Serial Data Output) function
XMUTE
F
F
F
F
HFO
0
1
0
1
* Note :
ON : ON HKS
OFF : OFF HKS
HF : Depress HF key
The SDO is serial data output which format is the same with UART protocol. SDO function is designed to drive
LCD driver and voice synthesizer to display dialing number on LCD screen and announce it to speaker. The SDO
signal consists of two start bits, six data bits and two stop bits.
0
1 Bit0 Bit1 Bit2 Bit3 Bit4 Bit5
0
1
Start bit
LSB
Data bits
MSB
Stop bit
The frequency of every bit is 256Hz (about 3.9 ms)
There are two categories of dialing data, and representation of serial data is as the following:
(b5,b4=0,0) Digit key
Key 1 2 3 4 5 6 7 8 9 0 * # P P-T
b3b2b1b0 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110
Display 1 2 3 4 5 6 7 8 9 0
P
(b5,b4=1,0) Function key
Key HF F
b3b2b1b0 1010 1111
Display
F
Note : */T key at pulse mode display " "
at tone mode display " "
* This specification are subject to be changed without notice.
10.1.1997 6
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