LC737212 [SANYO]
Telephone Dialer IC with On-Chip Memory for Push- Button Telephones; 电话拨号器IC，具有片上存储器的按钮式电话
| 型号： | LC737212 |
| 厂家： | 
SANYO SEMICON DEVICE |
| 描述： | Telephone Dialer IC with On-Chip Memory for Push- Button Telephones |
| 文件： | 总27页 (文件大小：305K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Ordering number : EN5203203
CMOS LSI
LC737212, LC737212M
Telephone Dialer IC with On-Chip Memory for Push-
Button Telephones
• Automatic pause (1.0 second) insertion after a flash
operation.
• Mode changing is one-directional, from pulse mode to
tone mode.
• Output of a key press tone (1036 Hz, 31 ms) for keys
other than DTMF keys when key input is valid
• Output of an operation complete confirmation tone
(2072 Hz, 279 ms for each telephone number) when a
telephone number is stored in memory
Overview
The LC737212 and LC737212M are CMOS LSI
telephone dialers for pushbutton telephones. They support
both DTMF and pulse dialing. These products include 25
16-digit memories for storing telephone numbers and one
63-digit memory for redialing, and they provide, in a
single chip, all the functions required for dialing and
control for a standard independent telephone, including
on-hook dialing and a hold function. They also provide a
serial I/O interface for connection to a microcontroller.
• Generates 12 signal types in DTMF mode.
• Supports an on-hook dialing mode.
• Supports a hold function with hold mode.
• Supports both 10 and 20 pps dialing pulse rates.
• The mode can be switched from either the P/T pin or by
a key input.
• Settable dialing pulse circuit closed ratio (make
percent): either 33% or 39%.
• Supports either keypad or serial input.
• Provides serial output of the keypad input data and the
internal status.
• Capable of controlling the serial output timing.
• Supports 18 user-defined keys.
Functions
• Fabrication in a CMOS process that allows these circuits
to be directly operated from a telephone line
• Support for single-contact keypads
• Built-in oscillator circuit (fosc = 3.58 MHz) that can
drive either a standard color-TV crystal oscillator
element or a ceramic resonator
• High-precision DTMF signal
• Frequency generator circuit (±0.1%) adopted for eased
ceramic resonator selection
• Five one-touch 16-digit auto-dial memories and 20
quick-dialing memories
• On-hook or off-hook can be specified for memory
entries.
• Mode change and pause data items can be stored in the
dialing memories.
• 63-digit redial memory
• Wide operating power-supply voltage range
— Pulse mode: V = 1.5 to 5.5 V
DD
— DTMF mode: V = 2.0 to 5.5 V
DD
• Low power operation
— Pulse mode: I = 0.5 mA max (V = 3.0 V)
DD
DD
— DTMF mode: I = 1.0 mA max (V = 3.0 V)
DD
DD
• Low standby current
— I = 0.5 µA max (V = 1.0 V)
• Automatic pause (3.9 seconds) insertion when the mode
is switched.
DR
DD
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
21398RM(OT) No. 5203-1/27
LC737212, 737212M
Package Dimensions
unit: mm
unit: mm
3170-DIP36S
3129-MFP36SD
[LC737212]
[LC737212M]
SANYO: DIP36S
SANYO: MFP36SD
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Maximum power supply voltage
Maximum input voltage
Maximum output voltage
Allowable power dissipation
Minimum load resistance
Operating temperature
Symbol
DD max
Conditions
Ratings
Unit
V
V
–0.3 to +6.5
V
IN max
–0.3 to VDD +0.3
–0.3 to VDD +0.3
250
V
V
OUT max
V
Pd max
L min
Ta ≤ 70 ˚C
Between the DTMF and VSS pins
mW
kΩ
°C
°C
P
1
Topr
Tstg
–30 to +70
–40 to +125
Storage temperature
Allowable Operating Ranges at Ta = 25°C
Parameter
Supply voltage
Symbol
VDDP
VDDT
VIH
Conditions
min
1.5
typ
max
Unit
V
Pulse mode
DTMF mode
All input pins
All input pins
5.5
5.5
2.0
V
Input high-level voltage
Input low-level voltage
Key contact resistance
Keypad capacitance
0.7 VDD
VSS
VDD
V
VIL
0.3 VDD
3.0
V
RKI
kΩ
pF
%
Ω
CKI
330
f
Center frequency = 3.579545 MHz
–1.3
+1.3
100
Oscillator element rating
RS
No. 5203-2/27
LC737212, 737212M
Electrical Characteristics at Ta = 25°C, fosc = 3.579545 MHz
Parameter
Symbol
IDDP
Conditions
Pulse output mode, outputs open, VDD = 3.0 V
DTMF output mode,outputs open, VDD = 3.0 V
Standby mode, outputs open, VDD = 1.5 to 5.5 V
Between VDD and VSS
min
typ
0.3
0.5
max
0.5
1
Unit
mA
mA
µA
V
Operating current drain
IDDT
Static current drain
IDD(ST)
VDR
1
Memory retention voltage
Memory retention current
1
IDR
VDD = 1 V
0.5
1
µA
The SOUT-ENA, OFF-HOOK, DPR, P/T, BMR,
ON-HOOK-DIAL IN, HOLD-OFF IN, DISCON IN,
SI/KEY, OFF/ON-HOOK, and STORE pins, VIH = VDD
IIH1
µA
µA
Input pin current
The SOUT-ENA, OFF-HOOK, DPR, P/T, BMR,
ON-HOOK-DIAL IN, HOLD-OFF IN, DISCON IN,
SI/KEY, OFF/ON-HOOK, and STORE pins, VIL = VSS
IIL1
–1
IILK1
IILK2
IOLK1
IOLK2
All key pins, VDD = 1.5 V, VILK = VSS
All key pins, VDD = 5.5 V, VILK = VSS
All key pins, VDD = 1.5 V, VOLK = 0.4 V
All key pins, VDD = 5.5 V, VOLK = 0.4 V
VO = VDD, VDD = 5.5 V, with the output off, the DP,
MUTE1, MUTE2, and S-OUT pins.
–20
–300
200
µA
µA
µA
mA
Key pin current
0.7
Output pin leakage current
IOFF
VOH1
VOH2
VOL1
VOL2
1
µA
V
The K-TONE, HOLD-OUT, HOOK-CTL,
VDD – 0.5
VDD – 1
and SP-CTL pins, VDD = 1.5 V, IOH = –250 µA
The K-TONE, HOLD-OUT, HOOK-CTL,
V
and SP-CTL pins, VDD = 5.5 V, IOH = –1 mA
Output pin voltage
The K-TONE, DP, MUTE1, MUTE2, SP-CTL,
0.4
0.4
V
HOLD-OUT, and HOOK-CTL pins, VDD = 1.5 V, IOL = 250 µA
The K-TONE, DP, MUTE1, MUTE2, SP-CTL,
V
HOLD-OUT, and HOOK-CTL pins, VDD = 5.5 V, IOL = 1 mA
AC Characteristics at Ta = 25°C, fosc = 3.579545 MHz
Parameter
Key debounce time
Symbol
TKD
Conditions
min
typ
30
max
Unit
ms
ms
HZ
HZ
ms
s
Pin chatter exclusion time
Key scan frequency
Key tone frequency
TPCHT
fKSC
OFF-HOOK, P/T, ON-HOOK-DIAL, IN HOLD OFF IN
45
258.9
1035.7
30.9
3.9
fKT
Key tone output time
TKT
In Pulse mode at 10 pps
In Pulse mode at 20 pps
DTMF mode
3.88
3.88
3.88
98
3.93
3.93
3.93
102
97
Auto-pause time
TAP
3.9
s
3.9
s
DTMF output time
DTMF interdigit pause time
Hooking time
TMFON
TMFOFF
THK
100
95
ms
ms
ms
s
93
700
0.98
710
1.0
720
1.02
Hooking pause time
THKP
Memory store confirmation
tone frequency
fKST
2071.4
278.1
Hz
ms
Memory store confirmation
tone output time
TKSTON
Low tone amplitude
Tone output ratio
VOR
dBCR
DIS
VDD = 3.5 V, RL = 10 kΩ
165
1
200
2
240
3
mVrms
dB
V
DD = 2.0 to 5.5 V, RL = 10 kΩ
DD = 2.0 to 5.5 V, RL = 10 kΩ
Tone output distortion
V
10
30
%
VDD = 1.5 to 5.5 V
DD = 3.0V
ms
Oscillator start time
TSTART
V
1
ms
No. 5203-3/27
LC737212, 737212M
Pulse Dialing Output/fosc = 3.579545 MHz
Dialing
pulse rate
Interdigit
pause
Make
percent
DPR pin
BMR pin
VSS
VDD
VSS
VDD
VDD
VDD
VSS
VSS
9.94 pps
19.89 pps
9.94 pps
19.89 pps
834.2 ms
525.2 ms
834.2 ms
525.2 ms
33.2%
33.2%
39.2%
39.2%
DTMF Output/fosc = 3.579545 MHz
Output frequency [Hz]
Input
Deviation [%]
Standard
697
LC737212
697.0
R1
R2
R3
R4
C1
C2
C3
C4
+0.01
–0.02
–0.03
–0.11
–0.03
+0.03
+0.02
+0.00
770
770.1
852
852.3
941
942.0
1209
1336
1477
1633
1209.3
1335.7
1476.7
1633.0
Pin Assignment
Top view
No. 5203-4/27
LC737212, 737212M
Block Diagram
No. 5203-5/27
LC737212, 737212M
Keypad Layout
R1
1
4
7
2
5
8
3
6
9
F
M
00
01
02
05
06
07
10
11
12
15
16
17
R/P
to
HOLD
ON/OFF
*
0
#
03
04
08
09
13
14
A4
A5
A1
A2
A3
STORE
R5
C1
to
C8
Key Matrix Functions (when the SOUT-ENA pin is high)
Digits 1 to 9, 0:
* and #:
Dialing data
DTMF dialing data
In pulse mode, the * key switches the LC737212/M to DTMF mode.
Flash (0.71 second)
F:
M:
R/P:
HOLD ON/OFF:
STORE:
A1 to A5:
00 to 17:
Quick-dialing address specification (only in the on-hook state, sets up memory store mode)
Redial, pause (3.9 seconds), clear the paused state
Controls the on/off state of hold mode
Sets up memory store mode.
One-touch dialing key
Definable function keys
The keypad is formed as a matrix using the key input pins (R1 to R5 and C1 to C8) and supports 40 keys. A given key is
input by shorting or grounding the column pin and the row pin for that key. To prevent discharge of the backup battery
due to inadvertent key presses in standby mode (when the circuit is disconnected from the telephone line), key input by
shorting is not accepted. This means that if on-hook storing of telephone numbers in memory is selected, the application
must implement STORE key (or M key) input by grounding the ROW pin and COLUMN pin.
• Digit keys (1 to 9 and 0)
— Dialing data keys
— Quick-dialing memory address specification keys
• * and # keys
— DTMF mode:
— Pulse mode:
The * and # keys function as dial data keys
* ... Pulse/tone switching key
# ... Unused.
• F key (flash key)
Invokes an operation equivalent to 0.71-second hooking implemented by turning on the DP output for 0.71 second.
Although a 1-second pause is automatically inserted, the following dialing data may be entered during that period.
Redialing is possible after a flash operation.
• M key (memory key)
When on-hook memory registration is set up, the system switches from standby mode to memory registration mode
when the M key is pressed. The address of the dialing memory is specified by combination of the digit keys that are
pressed immediately after the M key. The system operates as follows when the memory address operation is performed
incorrectly.
No. 5203-6/27
LC737212, 737212M
Memory readout
Memory store
• R/P key
After connecting to the line, the R/P functions as a redial key as long as the system has not performed a dialing output
operation. In manual dialing mode, the R/P key functions as the pause data key.
When dialing from memory:
— During a pause operation:
— While dialing:
Cancels the pause
Inserts a pause
During a redial operation:
— During a pause operation:
— While dialing:
Cancels the pause
Ignored
If two or more pause characters occur in the data, the pause cancel operation will cancel all pending pauses in a single
operation.
• STORE key
Pressing the STORE key sets the system to memory store mode. Pressing the STORE key again during a memory store
operation cancels all input data.
• HOLD ON/OFF key
Controls the on/off state of off-hook mode. No key tone is output at this time.
• Keys A1 to A5
These are the one-touch auto-dialing keys. Pressing one of these keys outputs the corresponding memory data from the
DP and DTMF pins.
• Keys 00 to 17
These are user-defined keys. When one of these keys is pressed, the LC737212/M outputs the corresponding status and
key code from the serial interface.
No. 5203-7/27
LC737212, 737212M
Pin Functions
Pin No.
Symbol
Function
1
2
3
4
5
6
7
C5
Column input
Row input
R1
R2
R3
R4
R5
SOUT-ENA
Serial output enable, H: enable, L: disable
Hold mode clear input; falling edge detection.
On-hook dialing input; falling edge detection
Serial input/keypad input switching
Hook-switching input
8
HOLD-OFF IN
9
ON-HOOK DIAL IN
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
SI/KEY
ON-HOOK
DPR
Dialing pulse rate switching; H: 20 pps, L: 10 pps
Pulse/tone switching; H:pulse, L: tone
R/T
BMR
Make percentage switching input; H: 33%, L: 39%
XIN
Oscillator circuit. Connect either a crystal or ceramic oscillator element with a
frequency of 3.58 MHz between these pins.
XOUT
OFF/ON-HOOK STORE
Off-hook store/on-hook store switching
Power supply
VDD
VSS
SP-CTL
DTMF
MUTE2
MUTE1
S-OUT
DP
Speaker reception control output; complementary output
DTMF output; npn emitter-follower output
DTMF mute output; n-channel open drain output
DP and K-TONE muting output; n-channel open drain output
Serial data output; n-channel open drain output
Dialing pulse output; n-channel open drain output
K-tone output; complementary output
K-TONE
HOOK-CTL
HOLD-OUT
DISCON IN
C1
Hook control output; complementary output
Hold mode output; complementary output
Disconnect input
C6
C7
C2
Column inputs
C8
C3
C4
No. 5203-8/27
LC737212, 737212M
• SOUT-ENA
Normaly set high. Serial output and Dial output are enabled when this pin is set high.
• HOLD OFF IN
Hold mode is cleared when a falling edge is detected on this pin. HOLD-OFF pin inputs are not accepted for the 0.5
seconds immediately following a transition to on-hook hold mode.
• ON-HOOK-DIAL IN
This pin toggles an on/off state on each input falling edge. When the telephone is on hook, this pin toggles the on/off
state of on-hook dialing mode. When the telephone is off hook, this pin toggles the on/off state of monitor mode.
• SI/KEY
The keypad is set to input mode when this pin is set low. When this pin is set high, serial input is enabled. In this state,
all keypad inputs are pulled up by built-in resistors, and the pins C6 to C8 function as the serial interface input pins.
C6 = serial clock input
C7 = serial data input
C8 = strobe input
• OFF-HOOK
This pin is the hook state switching input.
• DPR
This pin is the dialing pulse rate switching input. (H: 20 pps, L: 10 pps)
• P/T
This pin is the dialing signal switching input. (H: pulse, L: DTMF) This pin can only switch from pulse to DTMF. This
allows mixed-mode dialing, i.e. switching modes during dialing.
• DISCON IN
Setting this pin low switches the LC737212/M to low power mode and forcibly stops the oscillator circuit. All outputs
are turned off in low power mode. (The n-channel open-drain outputs go to the high-impedance state, and the
complementary outputs go low.) The internal states of the LC737212/M are reset when this pin goes high.
Off-hook input
On-hook Dial input
Status
H
H
L
H
L
STANDBY
ON-HOOK DIAL
OFF-HOOK DIAL
MONITOR
H
L
L
We recommend setting the DISCON pin low when power is first applied, and setting it high after the power-supply
voltage (V ) has reached or exceeded 1.5 volts.
DD
1 to 10 kΩ
0.1 to 10 µF
• BMR
This pin sets the break/make ratio for the dialing pulse output. (H: 33.2%, L: 39.2%)
• OFF/ON-HOOK STORE
This pin switches the memory storing mode.
H: Off-hook store (Memory stored with the telephone line connected.)
L: On-hook store (Memory stored with the telephone line disconnected.)
No. 5203-9/27
LC737212, 737212M
• SP-CTL
This pin provides the speaker reception control output. This output is set on during the on-hook dialing, monitor, and
hold states. This is a complementary output.
• DTMF
The DTMF output pin. This is an npn emitter-follower output.
• MUTE2
The DTMF muting output. This output is turned on in synchronization with the DTMF output. This is an n-channel
open-drain output. The wired OR with the MUTE1 output can be taken.
• MUTE1
The DP and K-TONE muting output. This output is turned on in synchronization with the dialing pulse and K-TONE
outputs. This is an n-channel open-drain output. The wired OR with the MUTE2 output can be taken.
• S-OUT
The serial data output. This pin is used to output the internal status of the LC737212/M and the keypad data. This is an
n-channel open-drain output.
• DP
The dialing pulse output. This is an n-channel open-drain output.
• K-TONE
This pin outputs the key input confirmation tone (1036 Hz, 31 ms) and the memory store confirmation tone (2073 Hz,
279 ms). This is a complementary output.
• HOOK-CTL
The circuit control output. A high level is output when the circuit is connected. This is a complementary output.
• HOLD-OUT
The hold control output. A high level is output during a hold. This is a complementary output.
• XIN and XOUT
The oscillator connection pins. Connect a 3.579545-MHz oscillator element. No other external components are
required if a crystal oscillator element with built-in feedback resistor and capacitor components is used. Two 30-pF
capacitors are required if a ceramic resonator is used.
• R1 to R5 and C1 to C8
The keypad connections.
• V and V
DD
SS
The power supply connections.
No. 5203-10/27
LC737212, 737212M
Pin Internal Circuit
Pin No.
Pin
Internal equivalent circuit
1 to 6
R1 to R5
C1 to C8
30 to 36
SOUT-ENA
HOLDOFF IN
ON-HOOKDIAL IN
SI/KEY
7 to 14
17
OFF-HOOK
DPR
29
P/T
BMR
OF/ON-HOOK STORE
DISCON IN
XIN
15
16
XOUT
MUTE2
MUTE1
S-OUT
DP
22 to 25
SP-CTL
20
K-TINE
HOOK-CTL
HOLD-OUT
26 to 28
21
DTMF
No. 5203-11/27
LC737212, 737212M
Key Operations
↓: On hook
: Key input
↑: Off hook
Dn
.
Dn: Pulse output Dn: Tone output
Item
Key Input
Dialing Output
D1
D1
D2
D2
↑
↑
•
•
•
•
•
Dn
D1, D2
D1, D2
•
•
•
•
•
Dn
D3
Normal dialing (pulse mode)
,
,
3.9 s
D3
R/P
Normal dialing using the R/P key (pulse mode)
,
,
D1
D2
↑
•
•
•
•
•
Dn
D1, D2
D1, D2
•
•
•
•
•
•
•
Dn
Dn
Normal
,
Normal dialing and redialing (pulse mode)
↑
R/P
•
•
•
↓
Redialing
.
.
3.9 s
3.9 s
D1
D1
D2
D3
D2
↑
*
D1,
D1,
, D2, D3
Using keys
,
,
,
Normal dialing including mode changes
(pulse mode at the start of the operation)
.
.
Using the P/T
switch
D3
↑
, D2, D3
, (P/T↓),
,
D1
D2
D3
D4
D5
STO
M
↓
Store (pulse mode)
Readout
Quick dialing
D4
D5
↑
M
D1, D2, D3
Memory store and
readout
D1
D2
D3
A1
STO
↓
Store (tone mode)
Readout
One-touch dialing
.
.
.
↑
A1
D1, D2, D3
Timing Charts
Pulse dialing
No. 5203-12/27
LC737212, 737212M
DTMF dialing
Flash operation
Pulse/tone mixed dialing
After the pulse dialing (including IDP) has completed, when DTMF key input operations are performed, DTMF signals are output continuously while keys are
pressed.
No. 5203-13/27
LC737212, 737212M
Pulse/Tone Mixed Dialing (using automatic pausing)
If a DTMF key operation is performed during dialing pulse output (including IDP), the K-TONE signal will be output continuously while keys are pressed.
Then, after the pulse dialing completes, the LC737212/M will pause for 3.9 seconds and then output the DTMF signals.
No. 5203-14/27
LC737212, 737212M
LC737212 and LC737212M Operating Specifications
1. IC Internal Status
The LC737212 and LC737212M have 14 internal states. Table 1 presents a functional overview of these states. The
individual status bits have the following interpretations.
D4: SP-CTL output
D3: HOOK-SW information
D2: Memory store
D1: Hold (the HOLDOUT output)
D0: Dialing allowed.
However, note that during standby key acquisition, D1 and D2 do not have the above meanings.
Table.1 State Table
HOOK-
CTL
SP-
HOLD-
OUT
Dialing
output
Status bits
D4 to D0
No.
State
HOOK-SW
Function
Notes
CTL
1
2
3
4
5
6
7
8
Standby
ON
ON
Key input by shorting key pins disabled.
OFF
OFF
ON
ON
ON
ON
ON
ON
OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
Disabled
Disabled
Disabled
Disabled
Enabled
Disabled
Enabled
Disabled
01000
01110
00001
00000
11001
11000
10001
10000
Standby with
Keypad input enabled. Only the keypad
data is output through the serial interface.
Switched to from
standby mode.
key acquisition
Off-hook dialing
OFF
OFF
ON
Off-hook dialing mode
Off-hook dialing with
key acquisition
Only the keypad data is output through the serial
interface. Data is not written to the redial memory.
Switched to from off-
hook dialing mode.
On-hook dialing
On-hook dialing mode
On-hook dialing with
key acquisition
Only the keypad data is output through the serial
interface. Data is not written to the redial memory.
Switched to from off-
hook dialing mode.
ON
ON
Monitor
OFF
OFF
Monitor mode
ON
Monitor with
Only the keypad data is output through the serial
interface. Data is not written to the redial memory.
Switched to from
monitor mode.
ON
key acquisition
Switched to from off-
hook dialing mode.
9
Off-hook hold
OFF
ON
Hold mode
ON
ON
OFF
ON
ON
ON
ON
ON
OFF
ON
ON
ON
ON
ON
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled
10010
11010
01100
00100
11100
10100
Switched to from on-
hook hold mode.
10
11
12
13
14
On-hook hold
Hold mode
Switched to from
standby mode.
On-hook store
ON
Memory store more (circuit disconnected)
Memory store more (circuit connected)
Memory store more (circuit connected)
Memory store more (circuit connected)
OFF
OFF
OFF
OFF
Switched to from off-
hook dialing mode.
Off-hook store
OFF
ON
Switched to from off-
hook dialing mode.
Off-hook dialing and store
Monitor store
Switched to from
monitor mode.
OFF
2. Dialing Output Specifications
Dialing output is possible in the off-hook dialing, on-hook dialing, and monitor modes.
The output pulse make percentage in pulse mode can be specified to be 33.2 or 39.3% with the BMR pin.
The output pulse rate in pulse mode can be set to be 10 or 20 pps with the DPR pin.
The LC737212 can generate 12 DTMF dialing signals in DTMF mode. (If serial input is used, it can generate 16
DTMF dialing signals.)
DTMF signals are output continuously as long as the corresponding key is held down.
The LC737212 guarantees a minimum DTMF output time of about 100 ms, and also guarantees a minimum IDP of
about 100 ms.
If the mode is changed (with the P/T pin or * key) during a pulse dialing operation and then DTMF data is keyed in,
the system automatically inserts a 3.9 second pause after completing the pulse dialing sequence and then outputs the
DTMF signals.
No. 5203-15/27
LC737212, 737212M
If the mode is changed after a pulse dialing operation and DTMF data is keyed in, the system does not automatically
insert a pause, but rather outputs the DTMF data as it is keyed in.
The pause key (the R/P key used as the second or later digit) can be used to enter pause data.
If pause data and mode change data (MC) are entered consecutively, the system pauses for 3.9 seconds.
After connecting to the line, the first time the R/P key is pressed, the system will redial the previously entered dialing
data.
3. Memory Output Specifications
The LC737212/M provides five 16-digit memory locations for one touch dialing memory, 20 16-digit memory
locations for quick-dialing memory, a 16-digit buffer memory for store operations, and a 63-digit redialing memory.
A single digit of memory can hold a single dialing data item (1 to 9, 0, *, or #), a single mode change data item
(MC), or a single pause data item (P).
• RD memory
The LC737212/M includes a 63-digit buffer memory that also functions as the redial memory, and thus is called the
RD memory. The keyed in input data is stored sequentially in the RD memory.
— Dialing data stored in RD memory is read out at the specified dialing rate and output from the DP or DTMF pin.
— Dialing numbers that exceed 63 digits is possible. The system writes the key data that exceeds 63 digits starting at
the beginning (location 0) of RD memory and outputs that data.
— However, this means that redialing numbers that exceed 63 digits is not possible since the dialing data is not all
correctly retained in RD memory.
• Dialing memory (one-touch dialing and quick dialing)
— LC737212 provides five locations (A1 to A5) for one-touch dialing, and 20 locations (M00 to M19) for quick
dialing.
— Each of these dialing memory locations holds 16 digits of dialing data plus the output format (pulse or DTMF) for
the start of the data.
— When a dialing memory location is accessed, its content is copied to RD memory and then the LC737212/M dials
that number by reading it out of RD memory.
— If a number stored as DTMF in dialing memory is read out after a pulse dialing operation, a mode change (MC)
data item is automatically inserted in RD memory.
— After a DTMF signal is output, if data registered as pulse data is read out from a dialing memory, that data will be
output as DTMF signals.
• Data store buffer memory
— This memory is used when storing a number in dialing memory.
4. Off-Hook Hold and On-Hook Hold Modes
Pressing the HOLD key switches between off-hook dialing mode and hold (off-hook hold mode).
In hold mode, the HOLD-OUT and SP-CTL outputs are turned on.
Dialing is disabled in hold mode.
It is not possible to hold during dialing.
Placing the phone on hook switches the system from off-hook hold mode to on-hook hold mode.
Lifting the receiver switches the system from on-hook hold mode to off-hook hold mode.
Hold is cleared by a falling edge on the HOLD-OFF IN pin.
— This switches from off-hook hold mode to on-hook dialing mode.
— This also switches from on-hook hold mode to standby mode.
After switching to off-hook hold mode, falling edges on the HOLD-OFF IN pin are not detected for 0.5 second.
5. On-Hook Dialing
Falling edges on the ON-HOOK DIAL IN input switches the system between standby mode and on-hook dialing
mode.
In on-hook dialing mode, the HOOK-CTL and SP-CTL pins output high levels.
It is not possible to hold when the system is in on-hook dialing mode.
Lifting the receiver switches the system to off-hook dialing mode.
No. 5203-16/27
LC737212, 737212M
6. Monitor Mode
Falling edges on the ON-HOOK DIAL IN input switches the system between off-hook dialing mode and monitor
mode.
In monitor mode, the HOOK-CTL and SP-CTL pins output high levels.
It is not possible to hold when the system is in monitor mode.•
to on-hook dialing mode.
Placing the receiver on-hook switches the system
7. Memory Store Function
On-hook (with the line disconnected) and off-hook (with the line connected, including on-hook dialing and monitor
modes) storing can be selected. The On/OFF-HOOK store pin is used for this selection.
Data is stored in memory in store mode. The following key sequences switch the system to store mode.
— On-hook (disconnected from the line) ... Pressing either the STORE or M key
— Off-hook (connected to the line) ... Pressing the STORE key
Data is written to a memory store buffer memory (16 digits) by keying in that dialing data. Key confirmation tones
(1036 Hz, 31 ms) are output from the K-TONE pin during this operation. Keyed data corresponding to a seventeenth
or later digit is ignored and the confirmation tone is not output for those digits.
Specifying the memory address copies the contents of the memory store buffer memory to the specified address and
completes the memory store operation. A memory store confirmation tone (2072 Hz, 279 ms) is output from the K-
TONE pin at this point.
The data at a given address can be deleted by switching to store mode and then specifying the address without
entering any dialing data.
8. Key Acquisition Modes
In these modes, the LC737212/M simply accepts key input and transmits the corresponding key code and status over
the serial interface. Data from the keypad is not written to the RD memory and dialing is not performed.
• Standby key acquisition mode
— Pressing the 00 key when the SI/KEY pin is low, or entering a code value of 20 when the SI/KEY pin is high,
switches the LC737212/M between standby mode and standby key acquisition mode.
— If, and only if, on-hook memory storing is selected, pressing the STORE key will switch the system to on-hook
store mode.
• Off-hook key acquisition mode, on-hook dialing key acquisition mode, and monitor key acquisition mode
— In modes that allow dial output, entering a code value of 20 over the serial interface will switch the LC737212/M
to the corresponding key acquisition mode.
— Even if the LC737212/M is in a key acquisition mode, dialing data entered over the serial interface will be dialed.
9. Serial Output
During key input and when the system's internal mode change, the LC737212/M outputs the corresponding status
data from the S-OUT pin. Values of 0 and 1 are expressed by the length of the period the n-channel open-drain
output pin is in the on state, and data is grouped in 4-bit units for output.
0 = 280 µs, 1 = 760 µs, inter-bit interval = 560 µs
Interval between 4-bit groups = 1440 µs
(In memory content readout mode only, the 4-bit group interval is 1520 µs.)
• During Key Input
— This data consists of 16 bits, starting with a bit (always 0) that indicates that this data is key input data. The next 2
bits are dialing related data, then the next 5 bits indicated the LC737212/M internal status, and finally, the last 8
bits indicate the key data.
— The data for all key presses that were longer than 30 ms (the key bounce (chatter) exclusion time) are output. (For
example, data key presses when the system is in hold mode are not dialed, but are output from S-OUT as key data.)
No. 5203-17/27
LC737212, 737212M
3
* Timing chart · Assuming the
key was pressed in normal mode.
D15
D14
D13
D12
Indicates that this is for key input. Always 0
Indicates the key data write type. Pulse = 1, DTMF = 0
Indicates dialing output. Output in progress = 1, output done = 0.
Upper bit of the IC internal status
D11
D10
D9
Lower four bits of the IC internal status.
D8
D7
D6
D5
D4
Key code KCU
D3
D2
D1
D0
Key code KCL
No. 5203-18/27
LC737212, 737212M
Key Codes
KEY
KEY CODE
KEY
1
ROW
COL
1
D7
1
1
1
1
1
1
1
1
1
1
1
1
D6
0
0
0
0
0
0
0
0
0
0
0
0
D5
0
0
0
0
0
0
0
0
0
0
0
0
D4
0
0
0
0
0
0
0
0
0
0
1
1
D3
0
0
0
0
0
0
0
1
1
1
1
1
D2
0
0
0
1
1
1
1
0
0
0
0
1
D1
0
1
1
0
0
1
1
0
0
1
1
0
D0
1
0
1
0
1
0
1
0
1
0
1
0
HEX
1
1
1
2
2
2
3
3
3
4
4
4
8
8
8
8
8
8
8
8
8
8
9
9
1
2
3
4
5
6
7
8
9
A
B
C
2
2
3
3
4
1
5
2
6
3
7
1
8
2
9
3
0
2
*/T
#
1
3
F
1
2
4
5
4
4
4
4
0
0
0
0
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
1
0
1
1
0
1
0
1
0
1
1
1
1
4
4
4
4
3
5
7
9
M
HOLD
STORE
R/P
3
4
0
1
1
0
1
0
0
1
6
9
No. 5203-19/27
LC737212, 737212M
Key Codes
KEY
KEY CODE
KEY
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
ROW
1
COL
5
D7
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
D6
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
D5
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
D4
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
D3
0
0
0
0
0
0
0
0
1
1
0
0
1
0
0
0
0
0
D2
0
0
0
0
1
1
1
1
0
0
0
0
0
0
1
1
1
1
D1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
0
0
1
1
D0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
HEX
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
2
5
3
5
4
5
5
5
1
6
2
6
3
6
4
6
5
6
1
7
2
7
3
7
4
7
5
7
1
8
2
8
3
8
A1
A2
A3
A4
A5
5
5
5
4
5
1
2
3
8
8
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
0
1
1
0
0
1
0
1
0
1
3
3
3
3
3
1
2
3
4
5
• Mode change (when the IC internal state changes)
— Here the data consists of eight bits, one bit (which is always 1) used to differentiate this data from key data, and
seven bits expressing the mode change. This data is output when the internal state changes, the P/T pin changes, or
when dialing completes.
— D5 expresses the state of the P/T pin.
1 = pules, 0 = DTMF
In the following cases, the status is not output even if the P/T pin changes state.
In standby mode, off-hook hold mode, or on-hook hold mode.
After tone data (including MC) is written to RD memory.
— When a memory location that does not have data stored is accessed:
If not dialing: the status when dialing completed is output as serial data.
If dialing: A serial output operation is not performed.
— If a redial operation is attempted when redial is disabled (when the last number dialed exceeded 63 digits) the
status when dialing completed is output as serial data.
* Timing Chart
· From the standby state to off hook, and then to off-hook dialing
· With the P/T switch set to P
state
No. 5203-20/27
LC737212, 737212M
10. Serial Input
The following control can be performed using serial input.
Keypad input replacement (except for user-defined keys)
Setting the status bits (e.g., setting the on-hook dialing mode on/off)
Reading out the content of dialing memory
Setting the output port on/off states (including the DTMF signal output)
• Serial input format
— Set the SI/KEY input pin high. This causes all the keypad inputs to be pulled up and the C6 to C8 pins function as
serial input pins for an internal shift register.
C6 = Clock input
C7 = Data input
C8 = Strobe input
— Data is written on the falling edge of the clock input
— The period when the strobe input is low is equivalent to the period when a keypad key is pressed.
— The data consists of 8 bits.
— Codes other than the 40 codes defined as keypad keys are defined as input data codes in the serial input.
— This allows controls other than the DPR and BMR controls to be input serially.
D1
D0
D2
D3
D4
D5
D6
D7
D0
No. 5203-21/27
LC737212, 737212M
Serial Input Code Table
Serial code
Command
Function or operation
(HEX)
00
01
02
03
04
05
06
07
08
09
0A
0B
0C
0D
0E
0F
10
11
12
13
14
15
16
17
18
19
1A
1B
1C
1D
Serial readout of quick-dialing memory locations 00 to 09
Serial readout of one-touch memory locations A1 to A5
Serial readout of the buffer memory used for storing to memory
Serial readout of quick-dialing memory locations 10 to 19
Undefined
Serial readout of redial memory
1E
1F
1C: digits 1 to 16
1E: digits 33 to 48
1D: Digits 17 to 32
1F digits 49 to 63
20
Key acquisition mode on/off setting
Undefined
21 to 2F
30
The same function as the A1 one-touch dialing key.
31
A1
A2
A3
A4
A5
32
33
The same functions as the one-touch dialing keys A1 to A5
34
35
36 to 3E
3F
The same function as the A1 one-touch dialing key
Cancels a memory store operation if one is in progress. Otherwise identical to the A1 key.
40 to 42
43
Undefined
F
RD
Identical to the F1 key.
44
Cancels redial or pause operations.
Identical to the M key.
45
M
46
CLR
HOLD
Clears all memories. This function is enabled in memory store mode.
Identical to the HOLD key.
Undefined
47
48
49
STORE
Identical to the STORE key.
On-hook dial and monitor mode setting (OHD-ON)
Undefined
4A
OHD-ON
4B to 4C
4D
RDINH
Disables redial.
Continued on next page.
No. 5203-22/27
LC737212, 737212M
Continued from preceding page.
Serial Code
Command
(HEX)
Function or operation
4E
DTMF output off
Initial settings (DISCON)
Undefined
4F
50 to 5F
60 to 6F
70 to 7F
80
DISCON
R/P
Identical to the R/P key.
Undefined
Undefined
81
1
2
3
4
5
6
7
8
9
0
82
83
84
Identical to the dial data keys 1 to 8.
85
86
87
88
89
Identical to the dial data keys 9 and 0.
8A
8B, 8C
8D
Illegal value
Pause data
Undefined
Illegal value
Undefined
8E
8F
90
91 to 9A
9B
Illegal in pulse mode. Dialing data when the IC is in tone mode.
Identical to the dial data key “*”.
Identical to the dial data key “#”.
Illegal in pulse mode. Pause data when the IC is in tone mode.
Undefined
*
9C
#
9D
9E
9F
Illegal value
A0, A1
A2
Undefined
MC
P1/DFIN
P2
Converts input data from pulse to DTMF. Illegal in tone mode.
Undefined
A3 to AF
B0 to BF
C0 to CF
D0
Undefined
Undefined
Outputs the DTMF signal for 1
Outputs the DTMF signal for 4
Outputs the DTMF signal for 7
Outputs the DTMF signal for *
Outputs the DTMF signal for 2
Outputs the DTMF signal for 5
Outputs the DTMF signal for 8
Outputs the DTMF signal for 0
Outputs the DTMF signal for 3
Left channel N output
D1
D2
D3
D4
D5
D6
D7
D8
D9
LCHN
LVSS
DA
Left channel ground. Normally 0 V.
Outputs the DTMF signal for #
Outputs the DTMF signal for A
Outputs the DTMF signal for B
Outputs the DTMF signal for C
Outputs the DTMF signal for D
Sets the S-OUT output off
DB
DC
DD
DE
DF
E0
E1
Sets the S-OUT output on
E2
Sets the HOLD output off
E3
Sets the HOLD output on
E4
Sets the HK-CTL output off
Continued on next page.
No. 5203-23/27
LC737212, 737212M
Continued from preceding page.
Serial code
Command
(HEX)
Function or operation
E5
Sets the HK-CTL output on
E6
Turns on the K-TONE 2-kHz frequency for 279 ms
Turns on the K-TONE 1-kHz frequency for 31 ms
Sets the SP-CTL output off
E7
E8
E9
Sets the SP-CTL output on
EA
EB
EC
ED
EE
EF
Sets the MUTE2 output off
Sets the MUTE2 output on
Sets the MUTE1 output off
Sets the MUTE1 output on
Sets the DP output off
Sets the DP output on
F0 to FF
SREQ
Reads out the status data serially (SREQ)
Note: The undefined command codes are ignored.
• Functions unique to the serial input commands
— When the SI/KEY pin is high, inputting code values 00 to 19 or 1C to 1F serially causes the contents of the
corresponding dialing memory to be output from the S-OUT pin.
— All data is grouped into four-bit groups and output. After first outputting the output format (pulse = 1111, DTMF =
1110), the LC737212/M outputs the dial data. The data value 0000 indicates that output has completed.
— See item (9) concerning serial output on page 17 for details on the output format for the data from the S-OUT pin.
— RD memory data (63 digits) is read out 16 digits at a time in four operations.
— When redial memory is disabled, attempts to read out RD memory (1C) serially will result in the output of either
F0 or E0.
Data in dialing memory is represented as shown in the table.
Representation
in RAM
Representation
in RAM
Dialing Data
Dialing Data
1
2
3
4
5
6
7
8
0001
0010
0011
0100
0101
0110
0111
1000
9
1001
1010
1011
1100
1101
1110
000
0
*
#
Pause
MC (P → C)
Data end
Switching Output Ports On and Off
— When the SI/KEY pin is high, inputting the following code values serially sets the corresponding output port on or
off. Since these commands directly write to the output port data latch, they do not change the internal status,
memory or other aspects.
S-OUT
HOLD
HK-CTL
K-TONE
SP-CTL
MUTE2
MUTE1
DP
ON (E1) OFF (E0)
ON (E3) OFF (E2)
ON (E5) OFF (E4)
1 kHz (E7) 2 kHz (E6)
ON (E9) OFF (E8)
ON (EB) OFF (EA)
ON (ED) OFF (EC)
ON (EF) OFF (EE)
No. 5203-24/27
LC737212, 737212M
When the K-TONE output is turned on, the MUTE1 output will operate in synchronization with the K-TONE
output.
When the HK-CTL output is turned on, key inputs due to shorting row pins and column pins will be accepted.
— When the SI/KEY pin is high, inputting the following code values serially can turn DTMF output on or off.
DTMF output
ON
4
*
5
0
6
#
B
D
(D1)
(D3)
(D5)
(D7)
(D9)
(DB) 9
(DD) A
(DF)
(4E)
1
7
5
8
3
(D0)
(D2)
(D4)
(D6)
(D8)
(DA)
(DC)
(DE)
C
DTMF output
OFF
Other Serial Input Codes
— SREQ (F0 to FF)
These commands output the IC's internal status from the SOUT pin. All the status items are valid.
— 20
Turns key acquisition mode on or off.
— 46 (CLR)
Inputting the CLR code in memory store mode erases all stored dialing data.
— 4A (OHD-ON)
Inputting the OHD-ON code in standby mode switches the system to on-hook dialing mode. Input the DISCON
code (4F) to return to standby mode.
— 8D (pause)
This command corresponds to 3.9-second pause data.
— A2 (MC)
Changes the dialing data input mode plug from pulse to tone. This is represented as 1110 in memory.
This is ignored and not written to memory if the dialing data input mode is tone mode.
Note that codes marked as undefined in the serial code table are ignored.
• Notes on serial input usage
— If the SI/KEY pin is switched from low to high and then to low again while a key is pressed, the LC737212/M will
receive two key presses for that key.
— TCLKD (The first SCLK input after the SI/KEY pin goes from low to high)
The LC737212/M monitors the SOUT output after SI/KEY goes high, and if there is no serial output due to a key
press after 3.5 ms or longer has elapsed, then it enables SCLK input. For all other cases, 35 ms or longer is
required.
— The IC will reliably output the status data from the SOUT pin if a status request command (FF) or a code 20
command in a mode other than hold or memory store mode is input. If this output does not appear for over 25 ms
(in cases other than serial readout from memory), the IC itself may have caused some sort of error. In such cases,
the IC must be re-initialized using the DISCON pin.
— We recommend always re-initializing the IC with the DISCON pin when receiving standby status. (At this time,
the IC will once again output the standby status data.)
No. 5203-25/27
LC737212, 737212M
Status Diagram
Basic functions
Key acquisition mode
No. 5203-26/27
LC737212, 737212M
During Store Operations
Off/On-HOOK STORE = 0
Off/On-HOOK STORE = 1
■ No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace
equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of
which may directly or indirectly cause injury, death or property loss.
■ Anyone purchasing any products described or contained herein for an above-mentioned use shall:
① Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and
distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all
damages, cost and expenses associated with such use:
➁ Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on
SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees
jointly or severally.
■ Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for
volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied
regarding its use or any infringements of intellectual property rights or other rights of third parties.
This catalog provides information as of February, 1998. Specifications and information herein are subject to
change without notice.
PS No. 5203-27/27
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