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EM91410CK Datasheet(PDF) 3 Page - ELAN Microelectronics Corp |
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EM91410CK Datasheet(HTML) 3 Page - ELAN Microelectronics Corp |
3 / 24 page EM91410 SERIES TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE AND DUAL-TONE MELODY GENERATOR 3 * This specification are subject to be changed without notice. 10.1.1997 FUNCTIONAL BLOCK DIAGRAM COL1 COL2 COL3 COL4/KT COL5 XIN XOUT ROW1 ROW2 ROW3 ROW4 HFO HDO XMUTE Keyboard interface (column) Oscillator Keyboard interface (Row) Output circuit Memory (Melody) Timing/Control circuit Input circuit Pulse generator latch & decoder D/A converter Row/Column programming counter DTMF PO HKS HFI VDD DRING VDD RMUTE SDO PIN DESCRIPTIONS Symbol Function ROW1~ROW4 Keyboard scan pins of row group. In idle state (HKS is “High” and HFO is “Low”), these pins stay “High impedance” level to prevent power consumption. Otherwise, these pins switch to “High” level for detecting keyboard entry. These pins will output 600 Hz signal while keyboard is scanning. COL1~COL3 and COL5 Keyboard scan pins of column group. In idle state, these pins stay “High impedance” level. Otherwise these pins switch to “Low” level for detecting keyboard entry. These pins will output 600 Hz signal while keyboard is scanning. COL4/KT 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 signal and 30 ms duration. To prevent signal interference, while DTMF issue, it will disable key tone output except function key. XIN and XOUT Oscillator input and output pins. A 3.579545 MHz crystal or ceramic resonator must be crossed connection to XIN and XOUT pins which generate system clock. XMUTE The Tone/Pulse MUTE signal output pin that is NMOS open-drain output structure. This pin will switch to “Low” level during Tone/Pulse dialing and hold function . Otherwise, this pin stays “High impedance” level. V DD and V SS Positive and negative power supply input pins. Recommended operating voltage from 2.0Vdc to 5.5Vdc. HFI Handfree inputs pin which accepts falling edge signal to turn “on” or turn “off” handfree function. This pin is hysteresis input structure and built-in pull up resistor (typically 200 Kohms). HFO Handfree outputs pin that is designed to control telephone line for on-hook dialing or control speakerphone circuit for handfree conversation. When handfree function is executed, this pin will switch to“High”. Otherwise, this pin stays “Low” level. DTMF The DTMF (Dual Tone Multi-Frequency) and music signals output pin. Normally, this pin stays “Low” level. In Tone dialing mode, this pin will output DTMF signal that is corresponding to keyboard 0 .. 9, * and # keys. Beside this, in the line hold duration, this pin will issue dual-tone music for telephone line. |
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