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| Communication ICs 13-station repertory pulse / tone dialer for telephone set BU8329 / BU8329F The BU8329 and BU8329F are large scale integrated circuits designed for use with telephones, with all of the pulse / tone dialer functions necessary for basic telephone operation. These ICs are equipped with an internal repertory memory containing 13 stations and 16 digits. FApplications Telephones FFeatures 1) The chip includes both a pulse and tone dialer, making it possible to dial in either pulse or tone mode. 2) Wide operating voltage range of 2.0V to 5.5V. 3) Internal on-hook dial control function and hold control function. 4) A built-in memory enables redialing of up to 32 digits. 5) Repertory dial function : 3 stations and 16 digits for 1-touch, : 10 stations and 16 digits for 2-touch. 6) Ceramic resonator of 3.579545MHz used. 7) Internal digital pause timer. 8) Internal flash function. 9) Compact SOP 24 pin and DIP 22 pin packages used. FSelection guide FAbsolute maximum ratings (Ta=25_C) 151 Communication ICs FRecommended operating conditions (Ta=25_C) BU8329 / BU8329F FBlock diagram 152 Communication ICs FPin descriptions BU8329 / BU8329F 153 Communication ICs BU8329 / BU8329F 154 Communication ICs BU8329 / BU8329F 155 Communication ICs FElectrical characteristics (unless otherwise noted, Ta=25_C, VDD=2.5V) BU8329 / BU8329F 156 Communication ICs FMeasurement circuit BU8329 / BU8329F FCircuit operation Keypad funtions 0 to 9 These are numeric keys, and dial signals are sent when one of these keys is pressed. When these are used in combination with the ST and AUTO keys, they can be used to specify a location in the 2-touch memory. In tone mode, when this key is pressed, the corresponding DTMF signal is sent. This is the redial pause key. If it is the first key pressed after redialing, the last number dialed is redialed, and when it is the second or subsequent key pressed after re*/T dialing, it serves as a pause key. This is used to switch from pulse mode to tone mode. In tone mode, pressing the key causes the corresponding DTMF signal to be transmitted. This is used to write data to the 1-touch and 2-touch memories. ST # RD / P 157 Communication ICs AUTO F EM1 to EM3 This is used to read data from the 2-touch memory. This is the flash key. These are used to write data to and read data from the 1-touch memory. BU8329 / BU8329F FKey operation : example 158 Communication ICs FOn-hook dial control function and hold control function BU8329 / BU8329F FTiming charts (1) Pulse mode timing chart (2) Tone mode timing chart 159 Communication ICs BU8329 / BU8329F (3) Timing when mode is switched (1) Using * / T 2) Using MODE pin (4) Pause function timing chart (1) Pulse mode 2) Tone mode 160 Communication ICs BU8329 / BU8329F (5) Flash function timing chart FElectrical characteristic curves 161 Communication ICs FExternal dimensions (Units: mm) BU8329 / BU8329F 162 |
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