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EM91440 Datasheet(PDF) 8 Page - ELAN Microelectronics Corp |
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EM91440 Datasheet(HTML) 8 Page - ELAN Microelectronics Corp |
8 / 24 page EM91440 SERIES TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE AND DUAL-TONE MELODY GENERATOR 8 * This specification are subject to be changed without notice. 10.1.1997 Operating flow chart <Note> : HF = Handfree HD = Hold Truth table Operating state Input/Output pin level HKS PO XMUTE HFO HDO (0) On-hook, idle state H F F L L (1) Off-hook line L F F L L (2) Off-hook, HF line L F F H L (3) On-hook, HF line H F F H L (4) Off-hook, HD line L F L L H (5) On-hook, HD line H F L L H Note : F=floating (high impedance); H=logic “High”; L=logic “Low” level. Music on Hold EM91440 series built-in a melody generator to generate dual-tone music on DTMF output pin. The music is designed for telephone line at line holding. 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 1 On-hook State 2 Off-hook State 4 On-hook Hand-free State HKS=Lo HKS=Lo HKS=Hi HF HF HD HF HD 6 On-hook Hold-line State 3 Off-hook Hand-free State HF HF HF HD HKS=Hi HKS=Lo 5 Off-hook Hold-line State HD HD HKS=Hi |
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