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PDF M491B1 Data sheet ( Hoja de datos )

Número de pieza M491B1
Descripción SINGLE-CHIP VOLTAGE SYNTHESIS TUNING SYSTEM WITH 1 ANALOG CONTROL
Fabricantes ST Microelectronics 
Logotipo ST Microelectronics Logotipo



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M491B
SINGLE-CHIP VOLTAGE SYNTHESIS TUNING SYSTEM
WITH 1 ANALOG CONTROL
. 16-STATION MEMORY - 7-SEGMENT LED
DISPLAY
. VOLTAGE SYNTHESIZER : 13 BITS
. 4-BAND PRESET CAPABILITY
. NON-VOLATILE MEMORY : 304 BITS
- 16 WORDS OF 19 BITS FOR TUNING VOLT-
AGE (13 bits) - BAND (2 bits) - FINE DETUN-
ING (4 bits)
- 104 MODIFY CYCLES PER WORD
- MIN 10 YEARS DATA RETENTION
. PCM REMOTE CONTROL RECEIVER : DE-
CODES SIGNAL TRANSMITTED BY M708
. VOLUME D/A : 6-BIT RESOLUTION / 8kHz
. MEMORY SKIP FUNCTION
. AUTOMATIC SEARCH WITH DIGITAL AFT
CONTROL
. FINE DETUNING D/A ACTING ON AFT DIS-
CRIMINATOR (16 steps) WITH SEPARATE
STORAGE FOR EACH MEMORY POSITION.
ALTERNATIVELY IT CAN BE USED TO CON-
TROL BRIGHTNESS OR COLOUR SATURA-
TION
. MANUAL SEARCH WITH DIGITAL AFT CON-
TROL
. MANUAL SEARCH WITH LINEAR AFT
. SWEEP SEARCH DISPLAY OUTPUT
. SUPPLY VOLTAGES : VDD = + 5V,
VPP = + 25V FOR THE MEMORY
. CLOCK OSCILLATOR : 445 TO 510kHz
. INTEGRATED DIGITAL POWER ON RESET
(no external initialization circuitry required)
DESCRIPTION
The M491B is a monolithic N-MOS LSI circuit in-
cluding a Floating-gate Non-Volatile Memory for
storage of up to 16 stations. Tuning of the station
is performed with a 8192 step D/A converter, using
the principle of voltage synthesis. It is designed for
7-segment LED displays. Direct memory selection
is possible only from remote control while Up/Down
memory scanning is possible on the set and also
from remote control. An option input for 8 or 16
stations is available. The circuit also includes a
PCM remote control receiver operating in conjunc-
tion with the transmitter M708. The highly reliable
transmission code ensures error-free signal detec-
tion even in presence of high noise conditions.
Search of the station is possible in automatic or
manual modes. The circuit can operate with a
Digital or Linear AFT control. The Digital AFT mode
is necessary for automatic search and requires an
external circuit (TDA4433 or equivalent, e.g. dual
comparator plus TV station detector) to convert the
AFC-S-curve into an Up/Down command. Fine tun-
ing (detuning) is also possible with different modes
of operation. The circuit is assembled in 40-pindual
in-line plastic package.
DIP40
(Plastic Package)
ORDER CODE : M491B1
PIN CONNECTIONS
VSS (GND)
MEMORY SUPPLY
MEMORY TIMING
FINE TUNING D/A
TUNING D/A
DIGITAL AFT STATUS
OSC. IN
OSC. OUT
VDD
TEST
I.R. INPUT
AFT 1
AFT 2
SWEEP DISPLAY OUT
VOLUME D/A
LINEAR AFT DEF.
DIGITAL AFT EN.
V3
V2
V1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
40 VHF I
39 VHF III
38 CATV
37 UHF
36 SEGM.h + i
35 SEGM. g
34 SEGM.f
33 SEGM. e
32 VSS (GND)
31 OPT. 8/16
30 SEGM. d
29 SEGM.c
28 SEGM. b
27 SEGM. a
26 MAINSON/OFF
25 MAINS ON OPTION
24 X1
23 X2
22 X3
21 X4
September 1992
1/16

1 page




M491B1 pdf
Figure 1
40mA
Figure 2
6mA
64 32 44 116µs
256µs
I (mA)
40
12mA
After about 30msec
M491B
12
5
Typ. max. 20msec
t (ms)
Typ. max. 8msec
ERASE CYCLE
Figure 3 shows the timing and the waveform of the
current flowing through Pin 2 during the erase
operation. The peak current is 7mA (max) during
the erase cycle and 6mA (max) during the read
cycle. The typical erase time is 10ms for a new
device and increases with the number of modify
Figure 3
7mA
6mA
operations up to 200ms after 1000 cycles.
In order to protect the memory in case of failure of
some bits the modify operation is stopped after
1sec.
READ CYCLE
Figure 4 shows the waveform of the current during
a read operation.
Figure 4
6mA
128µs 32 44 52
256µs
44 84µs
128µs
480µs
5/16

5 Page





M491B1 arduino
M491B
PIN 16 : LINEAR AFT DEFEAT OUTPUT
This output is normally High and goes Low when a
Manual Up/Down command is issued.
It returns High with a 1 second delay from the
release of the key, in order to give the user the
possibility of the tuning adjustment without the AFT
intervention. It goes Low for 0.5s during program
change.
Figure 12
MAN UP/DOWN
KEY PRESSED
MAN UP/DOWN
KEY RELEASED
LINEAR AFT
DEFEAT OUTPUT
1sec
PIN 17 : DIGITAL AFT ENABLE INPUT
If this input is connected to VSS (GND), the digital
AFT loop is always disabled. If pin 17 is left open
or is connected to VDD, the digital AFT is automat-
ically enabled at power on. When a manual
up/down search commandis issued, the digitalAFT
loop is disabled and the digital AFT status output is
inhibited.
The digital AFT loop is restored by the commands:
Digital AFT on/Automaticsearch/Automatic preset.
PINS 18-19-20-21-22-23-24 :
KEYBOARD MATRIX (see Figure 13)
A command is accepted if the corresponding con-
Figure 13
V1 V2
20 19
MEMORY
UP
DIGITAL
AFT ON
MEMORY
DOWN
AUTOMATIC
SEARCH
MAN SEARCH
UP
FT.
UP
MAN SEARCH
DOWN
FT.
DOWN
BAND
SEQ.
POWER
ON/OFF
VOLUME
UP
VOLUME
DOWN
tact has been closed for a minimum time of 30ms.
Local input commands and I.R. commands have
the same priority.
If a complete I.R. command has been received, the
local inputs are blocked until the command has
been executed and the ”end of transmission code”
generated.
Viceversa an I.R. signal cannot be decoded until
an issued local command has been executed.
MEMORY UP/DOWN
Depressing one of these two commands, the mem-
ory position is stepped in the UP or DOWN direc-
tion.
If the key is kept closed, the channels are stepped
UP/DOWN every 0.5 second or every 5 commands
from the transmitter.
The memory locations 9 to 16 are jumped if pin 31
is at GND level.
BAND SELECTION
The bands can be selected either directly or with a
step-by-step command in the following sequence :
VHF I
CATV
VHF III
UHF
VHF I and so on
Only one band change is performed at each ac-
cepted command.
Disabled bands are automatically skipped. A band
can be disabled connecting the corresponding out-
put to VSS.
V3 X1 X2 X3 X4
18 24 23 22 21
BAND
I
BAND
III
BAND
UHF
BAND
CATV
AUTOMATIC
PRESET
MEMORY
ADDRESSING
STORE
MUTE
11/16

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