AS2574BP AMSCO [austriamicrosystems AG], AS2574BP Datasheet
AS2574BP
Related parts for AS2574BP
AS2574BP Summary of contents
Page 1
Data Sheet Austria Mikro Systeme International Key Features Low operating voltage (2.5V to 5.5V) Low current consumption (typ. 200 mode) Oscillator using ceramic resonator (681 kHz) MF level independent of supply voltage Direct ´wake-up´ from keyboard Automatic ...
Page 2
Data Sheet Pin Description Pin # Pin Node 1 OSC2 2 OSC1 3 SCL 4 SDA MASK ...
Page 3
Data Sheet Pin Description Continued Pin # Pin Node Vss TONE 28 Vdd Keyboard Layout LNR The ...
Page 4
Data Sheet Power On Reset The on chip analogue power on reset circuit monitors the supply voltage ( long internal reference voltage, V REF oscillator is inhibited. When V rises above V DD signal is ...
Page 5
Data Sheet Recall Function A recall activation will invoke a flash (timed loop break earth recall (ER) depending on the ER pin. When the ER pin is forced flash is executed; and when DD ...
Page 6
Data Sheet Serial Interface The AS2574B supports a serial bus. The protocol defines device that sends data onto the bus as a transmitter, and the receiving device as the receiver. The AS2574B is controlling the transfer and hence the master. ...
Page 7
Data Sheet Key Combinations Key/Key Combination ENTER R MEM MUTE LS LNR 2nd 2nd, 1 2nd, 2 2nd, 3 2nd, 4 2nd, * 2nd, # 2nd MEM ENTER, Address* Displaying content ...
Page 8
Data Sheet Diode Options Option Column NoP M/B 4 ACP 5 MODE Row 5 NoP FT System Considerations The device is intended to be used in telephone instru- ments, that are permanently ...
Page 9
Data Sheet Symbols Idle Idle Off-hook On-hook Manual Dial The last manually dialled number is automatically stored in the LNR RAM mode * invokes temporary MF mode and # are ignored mode * and # are ...
Page 10
Data Sheet Programming/Notepad During programming the dial out is inhibited. Key in an address Content of selected memory is displayed Enter Access code(s) are displayed 10 Direct dial keys, a MEM and a 2nd key are available for addressing up ...
Page 11
Data Sheet Direct Dial/Abbreviated Dial/Last Number Redial D MEM Digit (M11 - 20) Terminate pause Reset timer Y DT high 1.15 sec N Rev High Y 2nd D Direct dial D ...
Page 12
Data Sheet Automatic Call Progress (ACP) D MEM Off-hook Off-hook Start timer Start timer Y Time-out 8 sec N Digit (M11 - 20) Terminate pause Reset timer Y DT high 1.15 sec N Rev. 1 (Diode 5 ...
Page 13
Data Sheet Privacy Mute MT output will go low. Change of Dialling hook state Rev. 1 (code 23) Speech mode Mute key Speech mode MT high Mute key (code 23) MT output will go low. Speech mode 13 AS2574B (code ...
Page 14
Data Sheet Temporary MF Select Speech mode LD default Speech mode MF selected LD default LD default Rev Key in digits All further entries are NOT stored in LNR RAM but buffered in FIFO. The LNR RAM will ...
Page 15
Data Sheet Setting Clock (in display driver) keep Enter Enter depressed Rev. 1 Speech mode Speech mode or idle keep Enter Enter depressed keep Enter keep Enter depressed depressed Press # release Enter Key in hours (2 digits) Key in ...
Page 16
Data Sheet Hook States Monitor 1) Pressing any unvalid key doesn´t have any effect in Idle state. 2) POT means Plain Ordinary Telephone. 3) Lift handset means HS going high. 4) ...
Page 17
Data Sheet Timing Diagrammes The timing diagrammes do not show the correct scaling only the sequence. P.O. Whole keyboard enabled Diode scanning Monitor State CD LS key DP Whole keyboard enabled CD LS key DP Rev. 1 ...
Page 18
Data Sheet LD Dialling Osc Key entry Mask DP = depending on Mute key (high when Mute key has been activated, otherwise low) MF Dialling Osc Key entry Mask Tone DP = depending Mute ...
Page 19
Data Sheet Flash Osc Key entry Mask DP T pre GL Pause = depending on Mute key (high when Mute key has been activated, otherwise low) Ground Loop (GL) Osc Key entry Mask DP ...
Page 20
Data Sheet Automatic Dialling LD (content of LNR is GL and GL is stored as access code) Osc Key entry LNR MT MR Mask DP GL Pause Tpo = depending on Mute key (high when Mute key has ...
Page 21
Data Sheet Electrical Data Absolute Maximum Ratings Positive Supply Voltage ...................................................................................................................-0.3V Input Voltage .......................................................................................................................-0.3V Input Current ................................................................................................................................................ 25 mA Storage Temperature ......................................................................................................................- +125 C Electrostatic Discharge (HBM) ...................................................................................................................... 1000V Recommended Operating Range Parameter Operating Temperatur Operating Voltage Retention ...
Page 22
Data Sheet Signalling Characteristics Defaults conditions: Recommended Operating Range Parameter Clock Startup Time Key Debounce Time HS Debounce Time CD Reset Delay Time DTMF Tone Level, High Group Preemphasis Distortion Tone Duration Inter Tone Pause Tone Rise/Fall Time LD Dial ...
Page 23
Data Sheet Pin Configuration 28 Pin DIP OSC2 1 OSC1 SCL SDA Pin PLCC Rev Pin SOIC OSC2 Vdd ...
Page 24
Data Sheet 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 description regarding the information set forth ...