Document
TONE/PULSE DIALER WITH LCD INTERFACE TONE/PULSE DIALER WITH LCD INTERFACE AND I.P.P. DETECT FUNCTION AND I.P.P. DETECT FUNCTION
EM91450 SERIES EM91450 SERIES
GENERAL DESCRIPTION
The EM91450 is a series of tone/pulse switchable dialers that is composed of T/P dialer. The EM91465 provide modern LCD driver's series data output port, which can display modern function operating icons. The EM91450 series provide necessary functions of telephone set for application in any environment, such as Pulse dialing, Tone (DTMF) dialing, Handfree dialing, keying tone ,and lock functions. The lock function is designed to inhibit toll dialing operation. Beside this, ring detector and SDO (Serial Data Output) functions are provided in advance version. Ring detector can prevent illegal dialing from pocket dialer. The SDO is designed to drive LCD driver and voice synthesizer. In this application, the dialing numbers and modern function operating icons can be displayed on LCD screen with LCD driver (EM32100 or EM32117 ). The EM91450 has a special I.P. P. detect function (Illegal Parallel Phone Detect) can prevent the illegal connect external Phone. The I.P.P. will detect the illegal user. When illegal user pickup phone, the function will alarm and send the alarm signal to the telephone line to interfer the illegal dialing.
FEATURES
• I.P.P. detect function prevents the illegal connect external phone. • SDO function supports LCD driver and voice synthesizer to indicate dialing numbers and function operating icons. • Lock function provides conventionality key lock and password lock operations. • Ring detector is designed to prevent illegal dialing from pocket dialer. • Line hold function is designed for stopping conversation temporality. • Tone/Pulse switchable. • Wide operating voltage from 2.0 V to 5.5 V. • Low operating current, 0.15 mA (Pulse) and 0.3 mA (Tone) typically. • Adding resistor on keyboard scan pin that can select many telephone specifications, such as : Pulse rate, M/B ratio, Flash time, lock dialing functions. • 13 set one touch or (3 set one touch and 10 set two touch) repertory memory, each one can hold data up to 16 digits. • A 32-digit LNB (last number) redial memory. • Keytone function provides rapidly keying recognition. • Handfree function provides on-hook dialing and speakerphone application. • Pause and P-T time are fixed to 3.6 seconds. • Tone duration and inter-tone pause time are fixed to 98 ms. • Using 3.579545 MHz crystal or ceramic resonator. • Package forms: PDIP, skinny.
ORDERING INFORMATION
Versions list and function outline VERSION LNB KT HOLD I.P.P. EM91450A √ √ √ EM91450B √ √ √ EM91450C √ √ √ √ EM91450D √ √ √ √ Note : PDP = Pocket Dialer Prevented : I.P.P. detect=Illegal Parallel Phone Detect. * This specification are subject to be changed without notice.
LOCK √ √ √ √
HF √ √ √
SDO(LCD) √ √
PDP
√
2.10.1999
1
EM91450 SERIES
TONE/PULSE DIALER WITH LCD INTERFACE AND I.P.P. DETECT FUNCTION
EM91450
Pin Assignment
EM91450AP
COL4/KT COL3 COL2 COL1 XIN XOUT XMUTE VSS 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 PO ROW4 ROW3 ROW2 ROW1 HKS VDD DTMF
EM91450BP
COL4/KT COL3 COL2 COL1 XIN XOUT XMUTE VSS HFI 1 2 3 4 5 6 7 8 9 18 17 16 15 14 13 12 11 10 PO ROW4 ROW3 ROW2 ROW1 HKS VDD DTMF HFO
EM91450CP
SDO COL4/KT COL3 COL2 COL1 XIN XOUT XMUTE VSS HFI 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 HDO PO ROW4 ROW3 ROW2 ROW1 HKS VDD DTMF HFO
EM91450DK
SDO COL4/KT COL3 COL2 COL1 XIN XOUT XMUTE VSS HFI DRING 1 2 3 4 5 6 7 8 9 10 11 22 21 20 19 18 17 16 15 14 13 12 HDO PO ROW4 ROW3 ROW2 ROW1 HKS VDD DTMF HFO RMUTE
Keyboard Arrangement
ROW1 ROW2 ROW3 ROW4
COL1 1 4 7 */T
COL2 2 5 8 0
COL3 3 6 9 #
COL4/KT HD F RD/P
* This specification are subject to be changed without notice.
2.10.1999
2
EM91450 SERIES
TONE/PULSE DIALER WITH LCD INTERFACE AND I.P.P. DETECT FUNCTION
FUNCTIONAL BLOCK DIAGRAM
SDO COL1 COL2 COL3 COL4/KT Keyboard interface (column) Output circuit Row/Column programming counter HFO HDO RMUTE
XMUTE
I/O circuit
Memory
latch & decoder
D/A converter
DTMF
XIN XOUT
Oscillator Timing/Control circuit
ROW1
Keyboard interface (Row) VDD HFI HKS DRING Input circuit Pulse generator PO
ROW4
PIN DESCRIPTIONS
Symbol ROW1~ROW4 Function Keyboard scan pins of row group. In idle state (HKS is "High" and HFO is "Low"), these pins stay ÒHigh impedanceÓ level to prevent power consumption. Otherwise, these pins switch to ÒHighÓ level for detecting keyboard entry. These pins will output 600 Hz signal while keyboard is scanning. Keyboard scan pins of column group. In idle state, these pins stay "High impedance" level. Otherwise these pins switch to ÒLowÓ level for detecting keyboard entry. These pins will output 600 Hz signal while keyboard is scanning. The fourth column group pin of the keyboard that also provides the keytone output . Normally, this pin stays "Low" level for detecting keyboard entry. After a valid keyboard entry, this pin will output keying confirmation tone that is 600 Hz si.