W91F820N

Preliminary W91F820N SERIES 13-FLASH MEMORY TON/PULSE DIALER WITH HANDFREE, LOCK AND HOLD FUNCTIONS GENERAL DESCRIPTION The W91F820N is a series of tone/pulse switchable telephone dialers with 13-flash memory, keytone, hold, lock, and handfree dialing control features. These chips are fabricated using Winbond's highperformance CMOS technology and thus offer good performance in low-voltage, low-power operations. FEATURES • • • • • • • • • • • • • • • • • • • • • Tone/pulse switchable dialer Two by 32 digits redial and save memory Three by 32 digits one-touch direct repertory flash memory Ten by 32 digits one-touch direct or two-touch indirect repertory flash memory The read-write times: 104 Pulse-to-tone (*/T) keypad for long distance call operation Chain dialing Uses 5 × 5 keyboard Easy operation with redial, flash, pause, and */T keypads Pause, P→T (pulse-to-tone) can be stored as a digit in memory Dialing rate:10 ppS or 20 pps by mask option Minimum tone output duration: 93 mS Minimum intertone pause: 93 mS Pause time: 3.6 sec. Flash break time (73 mS, 100 mS, 300 mS, or 600 mS) selectable by keypad; pause time is 1.0 S Make/break ratio (2:3 or 1:2) selectable by MODE pin Mute key for speech network mute No key will be accepted except the "HOLD" key when in the Hold mode Key tone output for valid keypad entry recognition On-chip power-on reset Uses 3.579545 MHz crystal or ceramic resonator • 20-pin 300 mil, or 22-pin 400 mil dual-in-line plastic package • The different dialers in the W91F820N series are shown in the following table: TYPE NO. W91F820N W91F820AN W91F820LN W91F820ALN W91F822N W91F822AN PULSE (PPS) 10 10 10 10 20 20 LOCK √ √ KEY TONE √ √ √ √ HANDFREE DIALING √ √ √ PACKAGE (PINS) 20 22 20 22 20 22 -1- Publication Release Date: January 1999 Revision A1 Preliminary W91F820N SERIES PIN CONFIGURATIONS C1 C1 C2 C3 C4 KT H/P MUTE VSS XT XT T/P MUTE 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 R4 R3 R2 R1 N.C. V DD MODE DTMF DP HKS C2 C3 C4 KT H/P MUTE V SS XT XT T/P MUTE HFI 1 2 3 4 5 6 7 8 9 10 11 22 21 20 19 18 17 16 15 14 13 12 R4 R3 R2 R1 N.C. VDD MODE DTMF DP HKS HFO W91F820N/822N W91F820AN/822AN C1 C1 C2 C3 C4 LOCK H/P MUTE VSS XT XT T/P MUTE 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 R4 R3 R2 R1 N.C. VDD MODE DTMF DP HKS C2 C3 C4 LOCK H/P MUTE VSS XT XT T/P MUTE HFI 1 2 3 4 5 6 7 8 9 10 11 22 21 20 19 18 17 16 15 14 13 12 R4 R3 R2 R1 N.C. V DD MODE DTMF DP HKS HFO W91F820LN W91F820ALN -2- Preliminary W91F820N SERIES PIN DESCRIPTION SYMBOL 20-PIN Column1−4 Row Inputs & 17−20 22-PIN 1−4 & 19−22 I/O I FUNCTION The keyboard input is compatible with a standard 5 × 5 keyboard, an inexpensive single contact (Form A) keyboard, and electronic input. In normal operation, any single button can be pushed to produce dual tone, pulses, or functions. Activation of two or more buttons will result in no response except for a single tone. A built-in inverter together with an inexpensive 3.579545 MHz crystal supplies the oscillator. The oscillator stops when there is no keypad input. The crystal frequency deviation is 0.02%. Crystal oscillator output pin. The T/P MUTE is a conventional CMOS N-channel open drain output. The output transistor turns on with a low level during a dialing sequence (both pulse and tone mode). Otherwise, it is off. No connect Connecting the mode pin to VSS places the dialer in tone mode. Connecting the mode pin to VDD places the dialer in pulse mode with an M/B ratio of 40:60. Leaving the mode pin floating places the dialer in pulse mode with an M/B ratio of 33.3:66.7. The HKS (hook switch) input is used to sense whether the handset is on-hook or off-hook. In on-hook state, HKS = 1: chip is in sleeping mode, no operation. In off-hook state, HKS = 0: chip is enabled for normal operation. KT (W91F820N/ F820AN/ F822N) XT 8 8 I XT T/P MUTE 9 10 9 10 O O N.C. MODE 16 14 18 16 I HKS 11 13 I 5 5 O LOCK (W91F820LN/ 820ALN only) 5 5 I HKS pin is pulled to VDD by internal resistor. The key tone output is a conventional CMOS inverter. The key tone is generated when any valid key is pressed; the KT pin generates a 1.2 KHz square wave at 35 mS. When no key is pressed, the KT pin remains in low state. The function of this terminal is to prevent "0" dialing and "9" dialing under PABX system long distance call control. When the first key input after reset is 0 or 9, all key inputs, including the 0 or 9 key, become invalid and the chip generates no output. The telephone is reinitialized by a reset. The function of the LOCK pin is shown below: LOCK PIN V DD Floating V SS FUNCTION "0", "9" dialing inhibited Normal dialing Mode "0" dialing inhibited -3- Publication Release Date: January 1999 Revision A1 Preliminary W91F820N SERIES Pin Description, continued SYM. H/P MUTE 20-PIN 22-PIN I/O 6 6 I FUNCTION The H/P MUTE is a conventional inverter output. During pulse dialing, flash break or hold period, this output is active high; otherwise, it remains in low state. N-channel open drain dialing pulse output. Flash key will cause DP to be active in either tone mode or pulse mode. The timing diagram for pulse mode is shown in Figure 1(a, b). During pulse dialing, this pin remains in a low state regardless of the keypad input. In tone mode, it will output a dual or single tone. A detailed timing diagram for tone mode is shown in Figure 2(a, b). OUTPUT FREQUENCY Specified R1 R2 R3 R4 C1 C2 C3 697 770 852 941 1209 1336 1477 Actual 699 766 848 948 1216 1332 1472 Error % +0.28 -0.52 -0.47 +0.74 +0.57 -0.30 -0.34 DP 12 14 O DTMF 14 15 O VDD, VSS HFI , HFO 15, 7 - 17, 7 11, 12 Power input pins for the dialer chip. VDD is the power and VSS is the ground. I, O Handfree control pins. I A low pulse on the HFI input pin toggles the handfree control state. The status of the handfree control state is listed in the following table: CURRENT STATE HOOK SW. HFO INPUT NEXT STATE HFO DIALING On Hook Off Hook On Hook Off Hook Off Hook Low High High Low High HFI HFI HFI Off Hook On Hook On Hook High Low Low Low Low High Yes No Yes Yes No Yes The HFI pin is pulled to VDD by an internal resistor. A detailed timing diagram is shown in Figure 3. -4- Preliminary W91F820N SERIES BLOCK DIAGRAM XT XT HKS HFI SYSTEM CLOCK GENERATOR LOCK ROW (R1 ~ R4,Vx/R5) KEYBOARD INTERFACE COLUMN (C1 ~ C4,Vss) LOCATION LATCH RAM T/P MUTE KT DP HFO H/P MUTE READ/WRITE COUNTER CONTROL LOGIC MODE PULSE CONTROL LOGIC DTMF D/A CONVERTER ROW & COLUMN PROGRAMMABLE COUNTER DATA LATCH & DECODER FUNCTIONAL DESCRIPTION Keyboard Operation C1 1 4 7 */T F1 C2 2 5 8 0 F2 C3 3 6 9 # F3 C4 S F4 A R/P H VSS EM1 EM2 EM3 SAVE R1 R2 R3 R4 Vx/R5 • S: Store function key • A: Indirect repertory memory dialing function key • H: Hold function key • R/P: Redial and pause function key • */T: * in tone mode and P→T key in pulse mode • SAVE: Save function key for one-touch 32-digit memory • M0−M9: One touch memory. The dialing number can be stored in M0−M9 locations by the S key. Note that the two touch memory (A+ 0−A+9) share the same memory buffer with M0−M9, respectively -5- Publication Release Date: January 1999 Revision A1 Preliminary W91F820N SERIES • EM1, ..., EM3: Emergency one-touch memory key • F1, ..., F4: Flash function keys: F1 = 600 mS, F2 = 300 mS, F3 = 73 mS, F4 = 100 mS; all flash pause time is 1.0 mS Note: D1, ..., Dn, D1`, ..., Dn`, */T, #, Mn: EM1, ..., EM3, Ln: 0−9 Normal Dialing OFF HOOK (or ON HOOK & HFI ), D1 , D2 , …, Dn 1. D1, D2, …, Dn will be dialed out. 2. Dialing length is unlimited, but redial is inhibited if length oversteps 32 digits in normal dialing. Redialing Dialing OFF HOOK Come The (or ON HOOK , & HFI (or , D1 , & D2 HFI , …, Dn ), , BUSY R/P ON HOOK OFF HOOK ON HOOK R/P key can execute redial function only as first key-in after off-hook. Otherwise, it will invoke the pause function. Number Store 1. OFF HOOK Mn (or A (or , ON HOOK Ln D1 or to & SAVE Dn HFI ) S key is pressed. ), D1 , D2 , ..., Dn , S , S , a. The dialing out of must first be finished before the b. D1, D2, …, Dn will be stored in memory location Mn or saved and then dialed out. 2. OFF HOOK Mn (or A (or , ON HOOK Ln or & HFI ) ), S , D1 , D2 , ..., Dn , S , SAVE a. D1, D2, …, Dn will be stored in memory location, Mn (or saved), but will not be dialed out. b. R/P and */T keys can be stored as a digit in memory, but the R/P is the pause function key. R/P key cannot be the first digit. In store mode, c. The store mode is released after the store function is executed or when the state of the hook switch changes or the flash function is executed. Save OFF HOOK (or ON HOOK & HFI ), D1 , D2 , ..., Dn , Save a. D1, D2, ..., Dn will be dialed out. b. If the dialing of save memory. -6D1 to Dn is finished, pressing SAVE will duplicate D1 to Dn to the Preliminary W91F820N SERIES OFF HOOK come on (or ON HOOK (or & ), & HFI ), SAVE HFI OFF HOOK ON HOOK c. D1 to Dn will be dialed out after the SAVE key is pressed. Repertory Dialing Procedure One-touch direct repertory dialing: OFF HOOK (or ON HOOK & HFI ), Mn (or SAVE ) Two-touch direct repertory dialing: OFF HOOK (or ON HOOK & HFI ), A , Ln (or Mn ) Access Pause OFF HOOK (or ON HOOK & HFI ), D1 , D2 , R/P , D3 , ..., Dn 1. The pause function can be stored in memory. 2. The pause function is executed with normal dialing, redialing or memory dialing. 3. The pause function timing diagram is shown in Figure 6. Pulse to Tone (*/T) OFF HOOK , D2' , ..., (or Dn' ON HOOK & HFI ), D1 , D2 , ..., Dn , */T , D1' , 1. If the mode switch is set in pulse mode, then it will perform D1, D2, ---, Dn, Pause (3.6 sec), D1', D2', ---, Dn' (Pulse) (Tone) 2. If the mode switch is set in tone mode, then the output signal will be: D1, D2, ---, Dn, * , D1', D2', ---, Dn' (Tone) 3. It can be reset to pulse mode only if ON HOOK is active. This is because it remains in tone mode when the digits have been dialed out. 4. The function timing diagram is shown in Figure 7. Flash OFF HOOK (or ON HOOK & HFI ), Fn 1. Fn = F1−F4. If Fn is pressed, the dialer will execute a flash break time of 600 mS (F1), 300 mS -7- Publication Release Date: January 1999 Revision A1 Preliminary W91F820N SERIES (F2), 73 mS (F3) or 100 mS (F4) and a pause time of 1.0 second, after which the next digit is dialed out. 2. The flash key has the first priority of the keyboard function only one flash key will be released to the user. 3. When the flash key is key in, the system will return to the initial state after the flash pause time is finished. 4. The flash function timing diagram is shown in Figure 8. Cascaded Dialing OFF HOOK 1. (or ON HOOK + & HFI ) + Normal Dialing Normal Dialing (1st sequence) Repertory Dialing (2nd sequence) + Normal Dialing (2nd sequence) 2. Repertory Dialing (1st sequence) + Repertory Dialing 3. Redialing + Normal Dialing + Repertory Dialing (1st sequence) (2nd sequence) Redialing is valid only for the first key-in. The second sequence should not be operated until the first sequence is dialed out completely. Mute OFF HOOK , MUTE MUTE has an on/off toggle function. The functional timing diagram is shown in Figure 8 . ABSOLUTE MAXIMUM RATING PARAMETER DC Supply Voltage Input/Output Voltage SYMBOL VDD-VSS VIL VIH VOL VOH Power Dissipation Operation Temperature Storage Temperature PD TOPR TSTG RATING -0.3 to +7.0 VSS -0.3 VDD +0.3 VSS -0.3 VDD +0.3 120 -20 to +70 -55 to +150 UNIT V V V V V mW °C °C Note: Exposure to conditions beyond those listed under Absolute Maximum Ratings may adversely affect the life and reliability of the device. -8- Preliminary W91F820N SERIES DC CHARACTERISTICS (VDD−VSS = 2.5V, Fosc. = 3.58 MHz, TA = 25° C, all outputs unloaded) PARAMETER Operating Voltage Operating Current Standby Current Memory Retention Current Tone Output Voltage Pre-emphasis DTMF Distortion DTMF Output DC Level DTMF Output Sink Current DP Output Sink Current SYM. VDD IOP ISB IMR VTO Tone Pulse CONDITIONS - MIN. 2.4 130 1 1.0 0.2 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 4 300 TYP. 0.4 0.2 150 2 -30 500 400 - MAX. 5.5 0.6 0.4 15 1 170 3 -23 3.0 5.0 UNIT V mA mA µA µA mVrms dB dB V mA mA mA mA mA mA mA mA mA µA KΩ µA KΩ HKS = 0, No load & No key entry HKS = 1, VDD = 1.0V Row group, RL = 5 KΩ Col/Row, VDD = 2.0−5.5V RL = 5 KΩ, VDD = 2.0− 5.5V RL = 5 KΩ, VDD = 2.0− 5.5V VTO = 0.5V VPO = 0.5V VMO = 0.5V VKTH = 2.0V VKTL = 0.5V VHFH = 2.0V VHFL = 0.5V VHPH = 2.0V VHPL = 0.5V VI = 0V THD VTDC ITL IPL IML IKTH IKTL IHFH IHFL IHPH IHPL IKD RHKS IKS T/P MUTE Output Sink Current KT Drive/Sink Current HFO Drive/Sink Current H/P MUTE Drive/Sink Current Keypad Input Drive Current HKS Pull High Resister Keypad Input Sink Current Keypad Resistance VI = 2.5V 200 - -9- Publication Release Date: January 1999 Revision A1 Preliminary W91F820N SERIES AC CHARACTERISTICS PARAMETER Key-in Debounce Key Release Debounce On-hook Debounce Pre-digit Pre-digit Pause1 Pause2 SYM. TKID TKRD TOHD TPDP1 10 ppS TPDP2 20 ppS Inter Digit Pause (Auto Dialing) TIDP Lock Mode Unlock Mode Mode Pin = VDD Mode Pin = Floating Mode Pin = VDD Mode Pin = Floating 10 ppS (W91F820N/W91F820AN/ F820LN/F820ALN CONDITIONS - MIN. - TYP. 20 20 20 150 40 33.3 20 16.7 800 MAX. - UNIT mS mS mS mS mS mS mS mS mS 20 ppS (W91F822N/F822AN only) - 500 800 500 40:60 33.3:66.7 93 93 600 300 73 100 1.0 3.6 1.2 35 600 2.2 300 - mS mS mS % % mS mS mS Interdigit Pause (Auto dialing) Make/Break Ratio Tone Output Duration Intertone Pause Flash Break Time TIDP M:B TTD TITP TFB 10 ppS 20 ppS Mode Pin = VDD Mode Pin = Floating F1 F2 F3 F4 Flash Pause Time Pause Time Key Tone Frequency Key Tone Duration One-key Redialing Pause Time One-key Redialing Break Time First Key-in Delay TFP TP FKT TKTD TRP TRB TFKD Lock only S S KHz mS mS S mS Notes: 1. Crystal parameters suggested for proper operation are Rs < 100 Ω, Lm = 96 mH, Cm = 0.02 pF, Cn = 5 pF, Cl = 18 pF, Fosc. = 3.579545 MHz ±0.02%. 2. Crystal oscillator accuracy directly affects these times. - 10 - Preliminary W91F820N SERIES TIMING WAVEFORMS HKS 4 TKID DP B M KEY IN 2 M 2 TKID TIDP T PDP B TIDP TPDP TIDP T/P MUTE H/ P MUTE KT DTMF LOW OSC. OSC. OSC. Figure 1(a) Pulse Mode Tming Diagram (Normal dialing without lock function) HKS