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EM91850 TONE / PULSE DIALER WITH HF, HD, REDIAL AND VOLUME CONTROL FUNCTION

Total System

EM91850 TONE / PULSE DIALER WITH HF, HD, REDIAL AND VOLUME CONTROL FUNCTION
GENERAL DESCRIPTION
The EM91850 are tone / pulse switchable dialer with Last Number Redail (LNB) and SAVE function, which are fabricate in CMOS technology with wide operating voltage for both tone and pulse mode. EM91850 consumes very low memory retention current in on hook state. The EM91850 provide necessary functions of telephone set for application in any environment, such as pulse dialing, tone (DTMF) dialing, handfree dialing. Beside this, hold , mute and redial function are provide for particular operation. In redial mode EM91850 can auto insert pause time for application in PABX system. EM91850 also have a special I / O pin - VAO can used tocontrol the receive volume amplify circuit. FEATURES · · · · · · · · Volume add Control Function. One key Redial Function. Flash key is available and have multiple Flash time ( 600 ms, 300 ms, 100 ms ) can be selected. Auto Insert Pause Time. Tone / Pulse Switchable. Pulse mode fixed 10PPS. Pulse to tone ( PT ) key is provided for PABX operation. Many options can be selected by R option. Mode ( Pulse, Tone ) M / B ratio ( 40:60 33:66 ) Auto insert pause time ( enable disable ) One set 32 digits SAVE function. One set 32 digits LNB redial function. Mixed and cascaded dialing. Hold and Mute function. Hand Free dialing. Tone duration and inter -tone pause are fixed at 90 ms. Flash pause time are fixed at 600 ms. Pulse to Tone pause time are fixed at 3.6sec. Uses 3.579545 MHz crystal or ceramic resonator (with built-in capacitor, no need extra capacitor). Package in DIP 16.
Total System
· Operating voltage : 2.0V ~ 5.5V · Operating current : Tone mode 0.3 mA (typical) ~ 0.5 mA Pulse mode 0.15 mA (typical) ~ 0.2 mA · Standby current : 0.01 uA ( typical ) 0.1 uA (max.) · Use single clock 3.579545 MHz crystal
This specification are subject to be changed without notice.
EM91850 TONE / PULSE DIALER WITH HF, HD, REDIAL AND VOLUME CONTROL FUNCTION
PIN ASSIGNMENTS
EM91850
K6 / XMUTE K5 K4 / MUTEO XIN XOUT VSS VAO HFI 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9
K3 K2 K1 / HDO DTMF PO HKS VDD HFO
PIN DESCRIPTIONS
K4 / MuteO
K6 / XMUTE
VDD, VSS Xin , Xout HFI
HKS DTMF PO
This specification are subject to be changed without notice.
EM91850 TONE / PULSE DIALER WITH HF, HD, REDIAL AND VOLUME CONTROL FUNCTION
Key Assignment :
F3 XMUTE
MuteO
KEYBOARD DESCRIPTION :
This specification are subject to be changed without notice.
EM91850 TONE / PULSE DIALER WITH HF, HD, REDIAL AND VOLUME CONTROL FUNCTION
FUNCTION DESCRIPTIONS
Dialer Option selection The EM91850 incorporated a special keyboard scanning function that is connecting a resistor ( typically is 560 K ) on keyboard scan pin to select many telephone specifications. The specifications are described as follow : a. M / B ratio K2 M / B ratio NR 40:60 R-Vss 33:66 b. Auto Insert Pause time K3 Auto Insert Pause time NR Disable R-Vss Enable d. Mode K5 NR R-Vss
Mode Tone Pulse
Normal Dialing : Press the digital key directly on keyboard which number can be dialing out and stored in LNB memory auto matically. Operating procedure described as following: · To select Pulse or Tone mode. · Off-Hook or turn on HF function. · Keying d1, d2, ..dn. The "d" expressed digital key pressed that include 1~9, , 0, #, P, and PT keys. The "n" expressed unlimited. · The numbers d1, d2, ..., dn will be dialed out in Pulse or Tone mode as selection. LNB Redial Function : Storing : In normal dialing mode, every digital key was entry which number will be stored in LNB memory automatically. If entry digits are more than 32 digits, the redial function of LNB memory will be disabled, otherwise, these numbers stored in LNB memory can be redial output. Redialing : EM91850 provide Redial and One Key Redial function (1) Redial function Off-Hook normal dialing directly keying "F" key (or ON-OFF Hook once) and key-in "RD" keyboard. The numbers stored in LNB memory will be dialed out. (2) One Key Redial function Off-Hook normal dialing, if busy, press the "RD" key directly then the line will be broken about 1.2 sec with Trp redial pause time and dial out the numbers stored in LNB memory automatically.
This specification are subject to be changed without notice.
EM91850 TONE / PULSE DIALER WITH HF, HD, REDIAL AND VOLUME CONTROL FUNCTION
Auto Insert Pause Time Function
This specification are subject to be changed without notice.
EM91850 TONE / PULSE DIALER WITH HF, HD, REDIAL AND VOLUME CONTROL FUNCTION
This specification are subject to be changed without notice.
EM91850 TONE / PULSE DIALER WITH HF, HD, REDIAL AND VOLUME CONTROL FUNCTION
Volume add function
This specification are subject to be changed without notice.
EM91850 TONE / PULSE DIALER WITH HF, HD, REDIAL AND VOLUME CONTROL FUNCTION
OPERATING FLOW CHART
Truth Table : Operating state HKS (1)On-hook, idle state (2)Off-hook line (3)Off-hook, HF line (4)On-hook, HF line (5)Off-hook, HD line (6)On-hook, HD line H L L H L H Input / Output pin level PO XMUTE Z Z Z Z Z Z L L L L H H
This specification are subject to be changed without notice.
EM91850 TONE / PULSE DIALER WITH HF, HD, REDIAL AND VOLUME CONTROL FUNCTION
ABSOLUTE MAXIMUM RATINGS(Ambient temperature is 25oC, all voltages referenced to VSS)
Items Power supply voltage Input voltage range Operating temperature Storage temperature Power consumption Sym. VDD VIN TOPR TSTO PD Rating 6.0 VSS-0.3V ~ VDD+0.3V 0 ~ +70 -55 ~ 150 500 Unit V V o C o C mW
RECOMMENDED OPERATING CONDITIONS
D.C. ELECTRICAL CHARACTERISTICS
Parameter Operating voltage Tone Pulse Memory retenion
Sym. Min. 2.0 2.0 1.0 Istby IDD Imrt ViH 0.7 ViL Vss IoH -0.2
Typ. Max. Unit 0.001 0.15 0.3 0.15 0.001 -350 20 -350 20 1.5 5.5 5.5 5.5 0.1 0.3 0.5 0.3 0.1 1 0.3 200 -0.01 -420 50 -420 50 2 V
Condition unload
Standby current Operating current Memory retention current HKS, HFI Input voltage HFO Drive current Sink current HFO pull down resistor VAO Leakage current Sink current MuteO, HDO, XMUTE Drive current Sink current K2, K3, K6 Output current PO Sink current Tone Pulse
IoL Rhf IoH IoL IoH IoL IoH IoL IoL
This specification are subject to be changed without notice.
EM91850 TONE / PULSE DIALER WITH HF, HD, REDIAL AND VOLUME CONTROL FUNCTION
ELECTRICAL CHARACTERISTIC
Parameter Keyin or release debounce Pulse rate Make / Break ratio Inter-digit pause time Pause time Pulse to tone time Flash break time
Sym. Tdb PSR MBR Tidp Tp Tpt Tf
Typ. 18 10 40:60 33:66 800 3.6 600 300 100 600 90 1.2 1 1 / 32 0.25 2.25 5
Condition
Flash Pause time Tone duration One key redial Break time One key redial Pause time Scan wave width Scan wave period Key board scan Period Auto Insert Pause Pre-Mute time
Tfp Td Trb Trb Tsw Tsp Tksp Taip Tpm
This specification are subject to be changed without notice.
EM91850 TONE / PULSE DIALER WITH HF, HD, REDIAL AND VOLUME CONTROL FUNCTION
TIMING DIAGRAM
HKS KEY XMUTE DTMF
PO XOUT Figure 1. Tone Mode operating Timing
HKS KEY Tdb XMUTE Tpm PO tB DTMF XOUT Tidp Tidp Tidp 1 2 Tdb 3
Figure 2. Pulse Mode operating Timing
This specification are subject to be changed without notice.
EM91850 TONE / PULSE DIALER WITH HF, HD, REDIAL AND VOLUME CONTROL FUNCTION
Pulse KEY 1 2 / T 3 Tone
XMUTE DTMF PO XOUT Tpt
Figure 3. Pulse to Tone operating Timing
F 1 dial inhibited 2 3
XMUTE Tf PO XOUT Tfp
Figure 4. Flash operating Timing
Tone mode KEY 1 P 2 1
Pulse mode P 2
Tp XMUTE DTMF PO XOUT Tp
Figure 5. Pause operating Timing
This specification are subject to be changed without notice.
EM91850 TONE / PULSE DIALER WITH HF, HD, REDIAL AND VOLUME CONTROL FUNCTION
HKS KEY 0 Taip DTMF Td XOUT 5 7
HKS KEY RD Taip
Titp DTMF XOUT
Figure 6. Auto Insert Time operating Timing
This specification are subject to be changed without notice.
EM91850 TONE / PULSE DIALER WITH HF, HD, REDIAL AND VOLUME CONTROL FUNCTION
Figure 8. Redial operating Timing( Tone Mode )
Figure 9. One key Redial operating Timing( Pulse Mode )
Figure 10. One key Redial operating Timing( Tone Mode )
This specification are subject to be changed without notice.
EM91850 TONE / PULSE DIALER WITH HF, HD, REDIAL AND VOLUME CONTROL FUNCTION
Tdb HFI HFO KEY 1 2 RD
Figure 11. Handfree Mode One key Redial operating Timing( Pulse Mode )
Figure 12. Handfree Mode One key Redial operating Timing( Tone Mode )
This specification are subject to be changed without notice.
EM91850 TONE / PULSE DIALER WITH HF, HD, REDIAL AND VOLUME CONTROL FUNCTION
HKS Tdb HFI Tdb HFO KEY K1 / HDO XMUTE / K6 K2~K6 XOUT
Figure 13. Handfree and Hold operating Timing
HKS KEY MuteO / K4 XMUTE DTMF XOUT Figure 14. Mute operating Timing 1
MUTE Tdb
This specification are subject to be changed without notice.
EM91850 TONE / PULSE DIALER WITH HF, HD, REDIAL AND VOLUME CONTROL FUNCTION
K1 Tsw K2 K3
K4 K5 K6 Tksp
Figure 15. Key board scan Timing
HKS KEY
Tsp HD HD Tdb
Figure 16. Hold active Key board scan Timing
This specification are subject to be changed without notice.
EM91850 TONE / PULSE DIALER WITH HF, HD, REDIAL AND VOLUME CONTROL FUNCTION
Tsw Tsp
K4 K5 K6 Tksp
Figure 17. Mute active Key board scan Timing
Figure 18. XMUTE active key board scan Timing
This specification are subject to be changed without notice.
OFF-HOOK ON-HOOK
1N4148
3K3 16V / 1W
SPEECH
1u XMUTE
Auto Release HOLD Function Circuit
33K 47K 1N4148 A42 0.1u 1N4148 HFO 33K 33K HDO 1N4148 104 103 100K 104 47K C945 / PO
Network
47K 470K 470K C945 C945 1U 104
APPLICATION CIRCUIT : CONTROL CIRCUIT
This specification are subject to be changed without notice.
100K 1N4148
EM91850
1 2 K6 / XMUTE K5 K4 / MuteO XIN XOUT VSS VAO HFI K3 K2 K1 / HDO DTMF PO HKS VDD HFO 16 15 14 13 12 11 10 9
1N4148 1N4148 100K
KEYBOARD
103 104 3.58M
EM91850 TONE / PULSE DIALER WITH HF, HD, REDIAL AND VOLUME CONTROL FUNCTION
RD SAVE
This specification are subject to be changed without notice.