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SC91215-D Datasheet(PDF) 7 Page - Silan Microelectronics Joint-stock |
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SC91215-D Datasheet(HTML) 7 Page - Silan Microelectronics Joint-stock |
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7 / 16 page  SC91214/91215 SERIES HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV:1.0 2004.08.03 Http: www.silan.com.cn Page 7 of 16 (Continued) Pin No. SC9121 4A SC9121 4B SC9121 4C SC9121 4D Pin Name Description 9 11 10 12 DP Dialing pulse output This is an N-channel open drain output. The normal output will be “ON”during break an “OFF” during make in the PULSE DIALING mode. 1 1 HFO (N.A.) (N.A.) 18 20 HFI Hands-Free Control I/O pins These pins enable and disable the Hands-Free control function. When input pin HFI goes low, the Hands-Free Control state is toggled on. The status of the Hands-Free control state is listed in the following table: 7 7 8 8 TONE Tone dialing output When a valid key-press is detected in the DTMF mode, appropriate low group and high group, frequencies the dual tone output. TONE output is in the “OFF”state in PULSE mode. 8 8 9 9 XMITMUTE Dialing transmission mute output This is an N-channel open drain output. The XMITMUTE is normally “OFF”. During pulse or DTMF dialing this output is “ON”. (N.A.) 9 (N.A.) 10 MODE OUT Mode output pin This is an N-channel, open drain output. It is “ON” during tone output and “OFF”during pulse output. 13 15 14 16 R1 14 16 15 17 R2 15 17 16 18 R3 16 18 17 19 R4 10 12 11 13 C1 11 13 12 14 C2 12 14 13 15 C3 Keyboard pins This input serves as the interface to an XY matrix keyboard. On a 4 X 4 matrix keyboard, the input from the fourth column, C4 , should be connected to VSS. 6 6 7 7 VDD 5 5 6 6 VSS Power supply pins These devices are designed to operate from 2.0V to 5.5V. |
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