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Details, datasheet, quote on part number:HT93214
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Datasheet text preview:
HT93214 Series 1-memory Tone/Pulse Dialer
Features
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Patent Number: 86474, 84545(R.O.C)
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Operating Voltage: 2.0V~5.5V Low standby current Low memory retention current: 0.1mA (Typ.) Tone/Pulse switchable 32 (pulse)/31 (tone) digits for redialing Pause and P ® T key for PBX 4´4 keyboard matrix 3.58MHz crystal or ceramic resonator
Hand-free control Pause, P ® T can be saved for redialing One-key redialing Keytone output Pause time: 2.2s Cascadable manual dialing after redialing Calibrated DTMF timing for redialing HT93214A: 16-pin DIP package HT93214B/AT: 18-pin DIP package
General Description
The HT93214 are dialer series designed for low cost telephone set applications with expandable features such as Lock function, keytone and LCD display interface. With a 4´4 keyboard, it performs normal tone/pulse switchable dialing, and provides one-key redialing function with a 32-digit memory for speed dialing. An on-chip oscillator is built-in to work with an external 3.58Mhz crystal or ceramic resonator for accurate timing. The HT93214 provides 300ms (F1 key) and 600ms (F2 key) of flash time; Tone dialing and 10pps, 20pps selection with 1/2 M/B ratio for pulse dialing.
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March 15, 2001
HT93214 Series
Selection Table
HT93214 series
Function Item HT93214A HT93214B HT93214AT Ö Ö HandFree Key Tone Flash Control Control Control Flash Time (ms) 300/600 300/600 300/600 Tone Inter Pulse Duration Tone No. (ms) Pause (ms) N N N 94 94 94 96 96 96 pps 10/20 10/20 10/20 M/B 1/2 1/2 1/2 PKG DIP 300mil 16 18 18
Block Diagram
FSM Key C o lu m n C3 Key F u n c tio n E ncoder W RM C o u n te r ADDRL R1 Key Row R4 E ncoder C lo c k C o n tro l F la s h /M o d e HF HKS HFI HFO MODEO MODE K e y to n e G e n e ra to r KT SRAM Tone E ncoder C o n v e rte r Tone O ut P u ls e O ut DTM F
PO XM UTE
C1
C o n tro l
C heck
D ebounce
X1 X2
D iv id e r
C lo c k G e n e ra to r
M /B
T im e r
Pin Assignment
HFO 1 2 3 4 5 6 7 8 9 HKS MODE X1 X2 VSS VDD DTM F XM UTE 8 7 6 5 4 3 2 1 16 15 14 13 12 11 10 9 R4 R3 R2 R1 C3 C2 C1 PO HKS MODE X1 X2 VSS VDD DTM F XM UTE 18 17 16 15 14 13 12 11 10 HFI R4 R3 R2 R1 C3 C2 C1 PO HKS 1 2 3 4 5 6 7 8 9 MODE X1 X2 VSS VDD DTM F XM UTE MODEO 18 17 16 15 14 13 12 11 10 R4 R3 R2 R1 C3 C2 C1 PO KT
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06'! "* & , 12
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March 15, 2001
HT93214 Series
Keyboard Information
C1 R1 R2 R3 R4 7 * /T 0 4 8 # 1 5 9 R C2 2 6 C3 3 HKS F1 F2 P
Pin Description
Pin Name I/O Internal Connection Description These pins along with the HKS form a 4´4 keyboard matrix which can perform keyboard input detection. When on-hook (HKS=high) all the pins are set high. While off-hook the column group (C1~C3) is set low and the row group (R1~R4) remains high for input detection. Pressing a key connects a single row to a single column HKS and actuates the system oscillator that results in a dialing signal output. If more than two keys are pressed at the same time, no response occurs. The key-in debounce time is 20ms. The system oscillator consists of an inverter, a bias resistor and the necessary load capacitor on chip. Connecting a standard 3.579545MHz crystal or ceramic resonator to the X1 and X2 terminals can implement the oscillator function. The oscillator is turned off in the standby mode, and is actuated whenever a keyboard entry is detected.
C1~C3 R1~R4
I/O
CMOS I/O
X1
I OSC
X2
O
XMUTE
O
NMOS open drain structure pulled to VSS during dialing signal NMOS transmission. Otherwise, it is an open circuit. This pin is used to Open Drain mute the speech circuit when transmitting the dial signal. This pin is used to monitor the status of the hook-switch and its combination with HFI can control the PO pin output to make or break the line. HKS=VDD: On-hook state (PO=low). Except for HFI (handfree control input), other functions are all disabled. HKS=VSS: Off-hook state (PO=high). The chip is in the standby mode and ready to receive the key input.
HKS
I
CMOS
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March 15, 2001
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