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EM91450DK Datasheet(PDF) 4 Page - ELAN Microelectronics Corp |
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EM91450DK Datasheet(HTML) 4 Page - ELAN Microelectronics Corp |
4 / 24 page EM91450 SERIES TONE/PULSE DIALER WITH LCD INTERFACE AND I.P.P. DETECT FUNCTION 4 * This specification are subject to be changed without notice. 2.10.1999 Symbol Function HKS Control signal inputs pin that is corresponding hook switch status. When handset was left from cradle, this pin must be connected to "Low" level to operate all functions. Otherwise, this pin must be connected to "High" level to disable all function and prevent power consumption. PO Pulse signal outputs pin that is NMOS open-drain output structure. Normally, this pin stays "High impedance" level. In Pulse dialing mode and keypad was entry. This pin will output pulse trains signal that is corresponding to keyboard 0 .. 9 keys. HDO Hold function output that is CMOS structure.Normally, this pin stays "Low" level. When Hold function is executing, this pin will output "High" level. This pin is designed to drive LED or peripheral circuit to indicate line is at Hold status. SDO SDO function output that is NMOS open-drain structure. When there is a valid entry on keyboard, this pin will output a serial data. This serial data is designed to drive LCD driver to display dialing number on LCD screen or drive voice synthesizer to announce dialing number to speaker. DRING The ring signal detect input pin. While the Tel-ring is incoming, this pin must be connected to "Low" with delay to indicate the ringing . Otherwise, this pin must be connected to "High" level . RMUTE Ring mute output pin that is NMOS open-drain structure. The RMUTE pin is designed to control microphone of handset to prevent the illegal dialing from pocket dialer. If the DRING pin is at "High" level , then Off-Hook or turn on Handfree , this pin will output "Low" level. In other words, the DRING pin is used to check the phone that receives an incoming call (DRING =Low input) or make an outgoing call (DRING= High input) . If the phone user make an outgoing call ,then RMUTE pin activated to prevent the illegal dialing from pocket dialer in the particular application. The RMUTE can be restored to "High" level when the first key entry is not the optioned lock-number . |
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