AS2578B

Data Sheet AS2578 /B Austria Mikro Systeme International ® TELEPHONE CONTROLLER WITH 13 MEMORIES AND 2-WIRE BUS General Description The AS2578 /B are a versatile repertory LD/MF diallers with a melody generator, a ring frequency discriminator and a 2-wire interface to EEPROM. Together with the AS2520/1, the AS2578 /B form a coherent basis for a fully electronic telephone with a wide range of options. The AS2578 /B are especially designed to adapt to different PTT specifications. A RAM is on chip for last number redial, 3 direct dial and 10 numbers with abbreviated dialling. To allow easy use under a PABX, the device incorporates automatic pause insertion and sliding cursor procedure as selectable options (AS2578) or centrex keys (AS2578B). The device can be used with or without EEPROM as appropriate. When an EEPROM is connected, all RAM content is stored in the EEPROM by power loss. The circuit provides the possibility to set different modes of operation (LM codes) via the keyboard or via pin options, e.g. default signalling mode, automatic pause insertion, flash or ground loop and settings of volume and melodies. Key Features u u u u u u Low operating voltage Low current consumption, standby ≤ 0.1 µA Oscillator using Xtal or ceramic resonator (3.58 MHz) Serial interface to external EEPROM Consistent, simple and usable procedures The settings are programmed via the keyboard and stored in EEPROM or set by pin options Dialler: Data protection with 20 digit FIFO Sliding cursor protocol with comparison Automatic pause generation Temporary MF select via keyboard 30 digit LNR (Last Number Redial) 13 x 20 digit memory (RAM) on chip Tone Ringer: Ring frequency discrimination 3 tone melody with 4 different repetition rates Volume of melodies can be set in 4 steps u u u u u u u u u Package Available in 28 pin DIP and PLCC. Block Diagramme Vss VDD (AS2578B) 1 4 7 * 2 5 8 0 3 6 9 # MUTE SET LNR M1 M2 M3 MEM A HS B C D MODE KEYSCAN POR HOOK STATE CE R 3.58 MHz OSCILLATOR CONTROL AP (AS2578 only) MV RR DP MASK GL MUTE DIAL REDIAL DTMF MELODY MF MO SCL SERIAL INTERFACE SDA 13 X 20 1 X 30 RAM FIFO RING FREQUENCY DETECTOR FCI AS2578 /B Rev. 3 1 March 1997 Data Sheet Pin Description Pin # 1 2 3 4 5 Symbol C4 C3 C2 C1 HS Function Keyboard Columns AS2578 /B Hook Switch Input This input is active high with internal pull-down resistor. Signalling (LD/MF) Default Mode Select Input Mode pin High Open Low Function LD default mode, make/break pulse 33/66 ms MF only LD default mode, make/break pulse 40/60 ms 6 MODE 7 CE Chip Enable Input This input is active high with internal pull-down resistor and is used to initiate setup procedures. Oscillator Input Oscillator Output Oscillator pins for Xtal or ceramic resonator (3.58 MHz). When a ceramic resonator is used a capacitor (10 - 22 pF) must be connected from each of the oscillator pins to VSS. Negative Power Supply DTMF Tone Output The dual tones provided at this output have a level independent of the supply voltage in the operating range from 2.5 to 5.5V. Serial Data I/O SDA is a bidirectional pin with an open drain with internal pull-up resistor and is used to transfer data into and out of a compatible EEPROM. Serial Clock Line Output The SCL output is an open drain with internal pull-up resistor and is used to clock data into and out of a compatible EEPROM. Frequency Comparator Input Schmitt trigger input for ring frequency discrimination. Melody Generator Output Melodies for tone ringing are generated on this output. The output signal is PDM. Mute Output This push-pull output is high during dialling and when mute key has been activated, otherwise low. Mask Output This push-pull output is high during pulsing (make and break periods). 8 9 OSC2 OSC1 10 11 Vss TONE 13 SDA 14 SCL 15 FCI 12 MO 16 MUTE 17 MASK Continues… Rev. 3 2 March 1997 Data Sheet Pin Description cont´d Pin # 18 Symbol DPN Function AS2578 /B Dial Pulse Output This is the push-pull output for controlling the hook-switch transistor. It is low during onhook and break periods and high during off-hook (see timing diagrammes). Ground Loop Output This push-pull output is high during ground loop Positive Power Supply Keyboard Rows 19 GL 20 21 22 23 24 25 VDD R4 R3 R2 R1 C5 Keyboard Column (AS2578) This column is for the memory keys Keyboard Column (AS2578B) This column is for centrex keys (A - D keys). Automatic pause insertion and Temporary MF select 1 are fixed enabled (AP open) Access Pause Select Input (AS2578) This input is used to select the automatic access pause insertion or sliding cursor (no centrex keys): AP pin High Open Low Function Sliding cursor enabled Automatic pause insertion enabled Sliding cursor and pause disabled C6 26 AP Temporary MF select 2 Temporary MF select 1 Temporary MF select 1 C5 Keyboard Column (AS2578B) This column is for the memory keys Melody Volume Select Input This input is used to select the volume of the melodies in 4 steps by connecting the MV pin to row 1, 2, or 3. Leaving the pin open is the default setting (max. volume). Repetition Rate Select Input This input is used to select the repetition rate of the melodies. 4 different rates can be selected by either leaving the pin open (default) or connecting it to column 1, 2, or 3. 27 MV 28 RR Note: "Open" means ≥ 100 kΩ. Power On Reset The on chip power on reset circuit monitors the supply voltage (VDD). As long as VDD remains below the internal reference voltage, Vref (typically 1.1V), the oscillator is inhibited. When VDD rises above Vref (tRISE = 1 µs/V to 50 ms/V), a reset signal is generated to assure correct startup. Initial Setup A low to high transition on the CE input will initiate an automatic setup, i.e. the pin options are scanned and (when an EEPROM is connected) the stored LM codes and melody settings are read from the EEPROM. This is done independently of the hook state (see timing diagrammes). Rev. 3 3 March 1997 Data Sheet Valid Keys The keyscanning is enabled when CE or HS are high. During setup the keyboard is disabled. A valid key is detected from the keyboard by connecting the appropriate row to the column. This can be done using an n x m keyboard matrix with single contacts. Positive and negative edges of each contact are debounced. The debounce time is 15 ms. AS2578 /B Furthermore, the mode can be selected by setting the LM code (see setup menu). If no LM code is set, the mode will be determined by the MODE pin. When default LD mode is selected, a temporary change to MF mode can be invoked by pressing * (AP = high, AS2578 only) or Set, * , Set. When the circuit is in temporary MF mode, each of the following procedures revert it to default LD mode: Mute Key The mute key is only enabled when off-hook. Depressing the mute key activates and deactivates (toggle switch) the MUTE output, when internal mute is inactive, i.e. in speech mode. Any key entry overwrites a mute activated by the mute key, and mute will be deactivated. - pressing Set, * , Set , - pressing recall key (by further entries of the recall key the signalling mode will toggle between MF and LD, - by next On-hook. Last Number Redial Centrex Keys (AS2578B only) The alphameric keys accommodate easy use of centrex services. The A, B, C and D keys are only valid in MF mode and are not storable. Pressing one of these keys will invoke the appropriate MF tones to be transmitted. The centrex keys are not stored in the RAM, but are buffered in the FIFO, and subsequently entered digits are also buffered in the FIFO. Pressing the recall key after a sequence including centrex keys will reset the RAM counter, and subsequently entered digits will be stored in the RAM. If MF select (Set, * , Set) has been invoked once, then all susequently digits/data will be buffered in the FIFO. LNR is a facility that allows resignalling of the last manually dialled number without keying in all the digits again. The LNR is repeatable. The current contents of the RAM are overwritten by new entries. A manually entered number is automatically stored in the LNR RAM. The capacity of the RAM is 30 digits. If a number greater than 30 digits is entered, the LNR facility will be inhibited (until new entries < 31 digits) and further entries will be buffered in FIFO. Postdialled digits, i.e. digits manually entered after LNR has been invoked, are not stored in RAM but buffered in FIFO. Memory Keys The keys M1 to M3 are direct memory access keys and the MEM key is used for abbreviated dialling. 13 numbers can be stored in on chip RAM. Each number can contain up to 20 digits (including pauses). If an EEPROM is connected to the serial bus, the content of the RAM is written into the EEPROM when CE is turned low indicating a power loss. During programming multible pauses can be inserted by pressing the LNR key. Memory dialling is cascadable. Recall Function A recall activation will invoke a flash (timed loop break) or a ground loop (GL) depending on the selected LM code, which is stored in the external EEPROM (see setup menu). If no LM code is set, depressing the recall key will invoke both a flash and a GL, however, in LD mode a Flash is never executed. If recall is the first entry in a digit string, it will be stored in LNR RAM when digit(s) are entered after the recall. If the recall key is depressed after a digit string has been entered or dialled out, the recall will not be stored, and subsequently entered digits will be stored in the LNR RAM as the new number. If pressing the recall key is not followed by digit entries, the LNR RAM remains intact. Mode Selection The default mode (LD or MF) can be selected by the MODE pin. Rev. 3 4 March 1997 Data Sheet After a recall a pause will automatically be generated. The pause time is 3 sec. The ground loop (GL) has two pulse lengths, namely a short of 500 ms and a long of 1250 ms. Short GL: If the recall key is depressed for ≤ 540 ms, the GL pulse is 500 ms. Long GL: If the recall key is depressed for > 540 ms, the GL pulse is 1250 ms. During redial a ground loop is only executed as a long GL (1250 ms). AS2578 /B protocol. The protocol defines any device that sends data onto the bus as a transmitter, and the receiving device as the receiver. The AS2578 /B are controlling the transfer and hence the master. The EEPROM being controlled is the slave. The AS2578 /B will always initiate data transfer, and provide the clock for both transmit and receive operations. Therefore, the protocol is for single master applications only. However, a temporary second master can be used to write into the EEPROM when the AS2578 /B are supplied and in idle state. Clock and Data Conventions Data states on the SDA line can change only during SCL low. SDA state changes during SCL high are reserved for indicating start and stop conditions (see figure 1 and 2). Start Condition All commands are preceded by the start condition, which is a high to low transition of SDA when SCL is high. The slave should continuously monitor the SDA and SCL lines for the start condition and must not respond to any command until this condition has been met. Stop Condition All communications are terminated by a stop condition, which is low to high transition of SDA when SCL is high. The stop condition is also used to place the slave in the standby power mode. Acknowledge Acknowledge is a software convention used to indicate successful data transfers. The transmitting device, either master or slave, will release the bus after transmitting eight bits. During the ninth clock cycle the receiver will pull the SDA line low to acknowledge that it received the eight bits of data (see figure 3). The slave should always respond with an acknowledge after recognition of a start condition and its slave address. If both the device and a write operation have been selected, the slave should respond with an acknowledge after receipt of each subsequent eight bit word. In the read mode, when the EEPROM has transmitted eight bits of data, it should release the SDA line and monitor the line for an acknowledge. If the AS2578 /B respond with an acknowledge and does not generate a stop condition, the EEPROM should continue to transmit data. If the AS2578 /B do not respond with an acknowledge, the EEPROM should terminate further Pause Generation Pause introduces a delay in signalling digit strings to accommodate second and subsequent dial tones. Automatic pauses are generated in the following manner: - always after a recall independent of the AP pin - with automatic pause insertion enabled by pin option or LM code, up to two pauses can be automatically inserted at any location of the original entry in the RAM (except location 1 of the digit string), when the mute output goes inactive (in MF mode for more than 1 sec.) before next entry. A pause read from the RAM can be terminated (shortened) prior to time out by a low level on AP pin (AS2578 only) during the pause execution. The pause time is 3 sec. During execution of a pause, mute is inactive, i.e. the circuit is in speech mode. Sliding Cursor Procedure (AS2578 only) To accommodate redialling (LNR) behind a PABX without using automatic pause generation, a sliding cursor protocol is implemented. The sliding cursor is enabled when AP = high. If new entries match the previous RAM contents, pressing the LNR key will dial out the remaining digits. If there is an error in matching, the LNR will be inhibited until next on-hook, and the RAM will contain the new number. Serial Interface The AS2578 /B support a bidirectional bus oriented Rev. 3 5 March 1997 Data Sheet data transmission and await the stop condition to return to the standby power mode. AS2578 /B Tone Generator The tone generator incorporates the DTMF tones and 3 basic frequencies for the tone ringer. DTMF The DTMF generator provides 8 frequencies, namely: Low group Row 1 Row 2 Row 3 Row 4 High group Col. 1 Col. 2 Col. 3 Col. 6 SDA SCL data stable data change 697 Hz 770 Hz 852 Hz 941 Hz Figure 1 Data Validity 1209 Hz 1336 Hz 1477 Hz 1633 Hz SDA (AS2578B only) SCL start bit stop bit The MF tones are in accordance with CEPT recommendations. Tone Ringer (Melody) The three basic frequencies of the melodies are: F1 = 800 Hz, F2 = 1067 Hz, and F3 = 1333 Hz (± 5%). Figure 2 Definition of Start and Stop SCL from master Data out from Tx Data out from Rx start 1 8 9 The repetition rate can be set via key procedures or by pin options as follows: LM code acknowledge Repetition rate 1 time (50 ms pause) 4 times 7 times 10 times Figure 3 Acknowledge Response From Receiver 1 2 (default) 3 4 Frequency Comparator The frequency comparator monitors that the ring signal is in the limits as shown in figure 4. Repetition rate means that a sequence of 6 frequencies is repeated 1 to 10 times within 1 sec. For LM code 1 a pause of 50 ms is inserted between the frequencies to allow a better recognition of the melodies. The sequence of the frequencies is controlled by the sequence register as follows: Sequence F1 F2 F3 F1 F2 F3 … MUST DETECT Tol. Ring frequency 50 60 70 (Hz) 20 30 40 The volume of the melodies (MO output) can be set as follows: LM code 1 2 3 4 Volume Steps Figure 4 Detection Window of Ringing Signal When a continious valid ring signal is present for 80 ms, the melody generator is activated and remains active until two or more periods of the ring signal are missing. - 17.5 dB - 11.5 dB - 5.5 dB (default) 0 dB 6 dB 6 dB 5.5 dB Rev. 3 6 March 1997 Data Sheet LM Codes and Pin Options LM code 02-2* 02-3 033* 033* 036 037 250 258 5 - 4* 5-3 5-2 5 -1 6-1 6 - 2* 6-3 6-4 Pin option AP = L AP = Hi-Z AP = H MODE = L MODE = H MODE = Hi-Z MV = Hi-Z MV = R3 MV = R2 MV = R1 RR = Hi-Z RR = C1 RR = C2 RR = C3 Function Automatic pause insertion: off Automatic pause insertion: on Automatic pause insertion: off LD mode 40/60 LD mode 33/66 MF mode MF mode MF mode GL GL GL Flash GL + Flash Sliding cursor: off Sliding cursor: off Sliding cursor: on AS2578 /B MF select 1 MF select 1 MF select 2 Resets all user settings to default and clears all RAM contents Clears all RAM contents Melody volume: Melody volume: Melody volume: Melody volume: Repetition rate: Repetition rate: Repetition rate: Repetition rate: 0 dB - 5.5 dB - 11.5 dB - 17.5 dB 1 time 4 times 7 times 10 times (50 ms pause) Note 1: Programming an LM code overwrites pin options, however, LM code 033 can only be selected when the MODE pin is connected to either high or low for selecting the make/break ratio. Not valid LM codes are ignored. LM codes with a '*' are default settings. Note 2: When the AP pin is pulled low during execution of a pause, the pause will be terminated. Note 3: AP pin option not available on AS2578B. Rev. 3 7 March 1997 Data Sheet Operating Procedures AS2578 /B Procedure Principles The procedures for utilizing the features of the AS2578 /B are optimized out of consideration for the human factor in order to: - meet the user´s expectations - be easy to learn and relearn - not invoke any automatic functions which the user doesn´t expect - protect the user from committing critical errors, e.g. dialling wrong numbers, etc. - be consistent, simple and usable - meet the German 1 TR 2 and ETR 2 specifications. Symbols States: Entries: Processing: X sec Time out (x sec.) Idle (on-hook, no ringing) Going off-hook Ringing Going on-hook or Dialling (LD or MF) Speech mode KEY Pressing a key Storing (writing into RAM or EEPROM) Processing according to text Melodies activated (ringing) Privacy mute Entering a number TEXT TEXT Programming Entry according to text False programme entry 1590 Enter password = reading from memory Invalid entry TEXT State according to text Rev. 3 8 March 1997 Data Sheet Setup Procedures AS2578 /B SET ANY OTHER ENTRY 1 * Temporary MF Select 5 or 6 M1-3 Storing Direct Numbers M EM Programming Melody Storing Indirect Numbers FALSE 1590 LNR Clear Procedures LM Codes: 022 = no AP, no SC 023 = AP, no SC 033 = LD (MODE pin = VDD or Vss), GL 036 = MF, GL 037 = MF, FL 250 = Resets all settings to default, inhibits LNR and memories 258 = Inhibits LNR and memories ANY OTHER ENTRY LNR ANY OTHER SEQUENCE LM Codes 022 or 023 or 033 or 036 or 037 LM Code 250 LM Code 258 LNR SET LNR SET LNR SET LNR 022, 023 executed. 033, 036, 037 buffered 022, 023 executed. 033, 036, 037 buffered Resets all settings to default Exit programme state SET 40 sec Rev. 3 9 March 1997 Data Sheet Clear Procedures AS2578 /B SET ANY OTHER ENTRY 1 * Temporary MF Select 5 or 6 M1-3 Storing Direct Numbers MEM Programming Melody Storing Indirect Numbers ANY OTHER ENTRY LNR 1590 Setup Procedures LM Codes: ANY OTHER SEQUENCE LM Code 258 258 = Inhibits LNR and memories LNR SET LNR Exit programme state SET 40 sec Rev. 3 10 March 1997 Data Sheet Programming Melody AS2578 /B SET ANY OTHER ENTRY 5 or 6 * Temporary MF Select 1 Setup Procedures & Clear Procedure M1-3 Storing Direct Numbers MEM Storing Indirect Numbers ANY OTHER ENTRY Key 1 , 2, 3, or 4 IGNORED LM Codes: SET (5) 1 = Melody volume - 17.5 dB (5) 2 = Melody volume - 11.1 dB (5) 3 = Melody volume - 5.5 dB (5) 4 = Melody volume 0 dB (default) (6) 1 = Repetition rate 1 (6) 2 = Repetition rate 4 (default) (6) 3 = Repetition rate 7 (6) 4 = Repetition rate 10 Executing LM Code Exit programme state SET 40 sec Rev. 3 11 March 1997 Data Sheet Programming Volume of Melody During Ringing AS2578 /B RINGING ANY OTHER ENTRY Key 1, 2, 3, or 4 Only one change during a ringing phase! IGNORED LM Codes: 1 = Volume - 17.5 dB 2 = Volume - 11.5 dB 3 = Volume - 5.5 dB 4 = Volume 0 dB (default) Executing LM Code End of ringing Rev. 3 12 March 1997 Data Sheet Temporary MF Select 1 (AP pin = open or low) AS2578 /B RAM FIFO Pressing any other key does not change the state. Set, * , Set D FIFO R Set, * , Set 2 FIFO 1 FIFO R EXIT FIFO Set, * , Set Rev. 3 13 March 1997 Data Sheet Temporary MF Select 2 (AS2578 only) (AP pin = high) AS2578 /B RAM FIFO Pressing any other key does not change the state. Set, * , Set * D FIFO R Set, * , Set 2 FIFO 1 FIFO R Set, * , Set EXIT FIFO * Rev. 3 14 March 1997 Data Sheet Automatic Dialling AS2578 /B MEM M1-3 LNR 0-9 or Postdialled digits are not stored but buffered in FIFO Rev. 3 15 March 1997 Data Sheet Storing Numbers AS2578 /B SET ANY OTHER ENTRY * Temporary MF Select 5 or 6 1 Set Procedures Programming Melody M1-3 MEM 0-9 M1-3 M1-3 MEM M1-3 SET MEM Exit programme state SET 40 sec CLEARS SAID RAM MEMORY LOCATION CLEARS SAID RAM MEMORY LOCATION Rev. 3 16 March 1997 Data Sheet Privacy Mute AS2578 /B MUTE Rev. 3 17 March 1997 Data Sheet Electrical Characteristics Absolute Maximum Ratings AS2578 /B Positive Supply Voltage ...................................................................................................................-0.3V ≤ VDD ≤ 7V Input Current ................................................................................................................................................ ± 25 mA Digital Input Voltage ......................................................................................................VSS - 0.3V ≤ VIN ≤ VDD + 0.3V Electrostatic Discharge (HBM) ........................................................................................................................ ±800V Storage Temperature ......................................................................................................................-65°C to +125°C Recommended Operating Conditions Supply Voltage (except DTMF) .....................................................................................................2.2V ≤ VDD ≤ 5.5V Supply Voltage (DTMF) .................................................................................................................2.5V ≤ VDD ≤ 5.5V Oscillator Frequency ..................................................................................................................................3.58 MHz Operating Temperature ....................................................................................................................- 25°C to +70°C DC Characteristics (Default conditions: recommended operating conditions; outputs unloaded; VDD = 3.5V; AP and MODE = Vss; unless otherwise specified)) Symbol IDD0 IDD IDD IDD VIL VIH IOL IOH RHS RCE Parameter Standby Current Standby Current Operating Current Operating Current Input Voltage, Low Line Voltage, High Output Current, Sink Output Current, Source Pull-down Resistor Pull-down Resistor VOL = 0.4V VOH = VDD - 0.4V Conditions HS = L; CE = L HS = H; Osc. = 0 no tones MF/melody VSS 0.8 VDD 1.5 1 1 1 400 0.9 Min Typ Max 0.1 3.6 700 1.5 0.2 VDD VDD Units µA µA µA mA V V mA mA MΩ MΩ AC Charateristics Symbol tS tD tHS tSU Continues… (Default conditions: recommended operating conditions) Conditions Min Typ Max 5 14.7 14.7 100 Units ms ms ms ms Parameter Clock Startup Time Key Debounce Time HS Debounce Time Setup Time Rev. 3 19 March 1997 Data Sheet AC Characteristics Cont´d Symbol Parameter DTMF VMF ∆VL-H THD tTD tITP tTR tTF tDR tM/B tIDP tMO tFD tGLS tGLL tAP VMO tMD F1 F2 F3 tDT tTO fMIN fMAX MF Tone Level Preemphasis Low to High Distortion (0.3 - 4 kHz) Tone Duration Inter Tone Pause Tone Rise Time Tone Fall Time LD Dial Rate Make/Break Period ±5% ±5%, MODE = low ±5%, MODE = high Inter Digit Pause Mute Overhang 800 10 40.8/61.2 33/66 840 tM 100 R key ≤ 540 ms R key > 540 ms 495 1200 2.9 500 1250 3.0 High group, RL = 15 kΩ RL = 15 kΩ RL = 15 kΩ, note 3 Note 1 Note 1 Note 2 Note 2 80 80 82.3 82.3 -12.3 2.0 -10.8 2.4 Conditions Min Typ AS2578 /B Max Units -9.3 2.8 -23 85 85 5 5 dBm dB dBr ms ms ms ms pps ms ms 880 ms Flash Duration Ground Loop, Short Ground Loop, Long Automatic Pause Melody Melody Output Melody Delay Frequency 1 Frequency 2 Frequency 3 Detection Time Detection Time-out Min. Detection Frequency Max. Detection Frequency 102 505 1300 3.1 ms ms ms sec PDM 10 770 1025 1280 80 note 4 19 58 20 59 21 60 800 1067 1333 830 1110 1385 85 ms Hz Hz Hz ms ms Hz Hz Note 1: The values are valid during automatic dialling and are minimum values during manual dialling, i.e. the tones will continue as long as the key is depressed. Note 2: The rise time is the time from 10% of final value till the tone amplitude has reached 90 % of its final value. Note 3: Relative to high group. Note 4: The FCI circuit is reset by POR and on-hook. After a reset the FCI circuit is in a standby state. A positive edge on FCI will start the 73 ms timer and the frequency discrimination is initiated. Whenever a period of the ring frequency is missing, the timer is reset. When a valid ring signal is present for ≥ 73 ms, the melody generator is started and is directly controlled by a valid signal from the FCI circuit. This condition will remain until a new reset. Rev. 3 20 March 1997 Data Sheet Pin Configurations AS2578 /B C4 C3 C2 C1 HS MODE CE OSC2 OSC1 Vss TONE MO SDA SCL 1 2 3 4 5 28 27 26 25 24 RR MV AP C5 R1 R2 R3 R4 VDD GL DP MASK MUTE FCI 28 Pin DIP C4 C3 C2 C1 HS MODE CE OSC2 OSC1 Vss TONE MO SDA SCL 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 RR MV C5 C6 R1 R2 R3 R4 VDD GL DP MASK MUTE FCI AS2578B RR C4 C2 C3 24 23 22 21 20 19 18 17 16 15 6 7 8 9 10 11 12 13 14 AS2578 23 22 21 20 19 18 17 16 15 MV RR MV C1 HS MODE CE OSC2 OSC1 Vss TONE 1 AP C2 C3 C4 C5 R1 R2 C1 HS MODE CE OSC2 OSC1 Vss TONE 1 C5 C6 R1 R2 AS2578 R3 R4 VDD GL AS2578B R3 R4 VDD GL SDA MASK MUTE SCL MO FCI DP SDA MO 28 Pin PLCC Rev. 3 21 MASK SCL MUTE FCI DP March 1997 Data Sheet Ordering Information: Part Number AS2578 P AS2578 N AS2578B P AS2578B N Package 28 pin DIP 28 pin PLCC 28 pin DIP 28 pin PLCC Pin 25 C5 C5 C6 C6 Pin 26 AP AP C5 C5 AS2578 /B Applications: For application support contact your local AMS sales office. Devices sold by Austria Mikro Systeme are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. Austria Mikro Systeme makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. Austria Mikro Systeme reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with Austria Mikro Systeme for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by Austria Mikro Systeme for each application. Copyright © 1995-7, Austria Mikro Systeme International AG, Schloss Premstätten, 8141 Unterpremstätten, Austria. Trademarks Registered®. All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. Rev. 3 22 March 1997