Description
Hook switch input MODE IN = VDD: pulse mode, 10 Hz, М/В = 1/2, MODE IN = VSS: tone mode, MODE IN = floating mode, 20 Hz, М/В = 1/2 Oscillator input Oscillator output Ground Supply output Tone dialing output Dialing transmission mute output Mode output pin Key-in tone output Dialing pulse output Keyboard column input Keyboard column input Keyboard column input Keyboard row input Keyboard row input Keyboard row input Keyboard row input 03 14 OSCO 04 Vss 05 Vdd TONE 1 2 1 2 IL91214A 13 12 11 10 09 06 07 08 XMIT MUTE HK MODE IN 01 02 18 17 16 R4 R3 R2 R1 C3 C2 C1 DP 3 4 5 6 7 8 9 10 11 12 13 14 15 16 OSCI 03 OSCO 04 15 14 13 12 Vss 05 Vdd 06 TONE 07 XMIT MUTE 08 11 10 MODE OUT 09 KT 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 OSCI OSCO VSS VDD TONE XMIT MUTE MODE OUT KT DP C1 C2 C3 R1 R2 R3 R4 Fig.
