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SC91415CK Datasheet(PDF) 7 Page - Silan Microelectronics Joint-stock |
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SC91415CK Datasheet(HTML) 7 Page - Silan Microelectronics Joint-stock |
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7 / 23 page  Silan Semiconductors SC91415 SERIES HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD Rev: 2.0 2001-11-13 7 PIN DESCRIPTION Pin No. AP BP CK DK Pin Name Description 13 15 16 18 ROW1 14 16 17 19 ROW2 15 17 18 20 ROW3 16 18 19 21 ROW4 -- -- 22 24 ROW5 -- -- 1 1 ROW6 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 600Hz signal while keyboard is scanning. 55 66 COL1 44 55 COL2 33 44 COL3 11 22 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 600Hz signal while keyboard is scanning. 22 33 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. 66 77 XIN 77 88 XOUT Oscillator input and output pins. A 3.579545MHz crystal or ceramic resonator must be crossed connection to XIN and XOUT pins which generate system clock. 88 99 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. 11 13 14 16 VDD 9 9 10 10 VSS Positive and negative power supply input pins. Recommended operating voltage from 2.0Vdc to 5.5Vdc. -- 10 11 11 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 200k Ω). -- 11 12 14 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. 10 12 13 15 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. (to be continued) |
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