M494B1 datasheet(1/22 Pages) STMICROELECTRONICS

部件名	M494B1

功能描述	SINGLE-CHIP VOLTAGE TUNING SYSTEM WITH 4 ANALOG CONTROLS AND mP INTERFACE

PDF	22 Pages

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制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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1 / 22 page

M494

SINGLE-CHIP VOLTAGE TUNING SYSTEM WITH

4 ANALOG CONTROLS AND

µP INTERFACE

June 1991

DIP40

(Plastic Package)

ORDER CODE : M494B1

.

NON-VOLATILE MEMORY FOR 20 PRO-

GRAM WORDS (17 BIT x 20)

- TUNING VOLTAGE 12 BITS

- BAND 2 BITS

- MULTI STANDARD 2 BITS

- PROGRAM SKIP BIT 1 BIT

- 10,000 MODIFY CYCLES PER WORD

- MIN. 10 YEARS DATA RETENTION

.

13 BIT VOLTAGE SYNTHESIZER (BRM + PWM)

.

NV MEMORY FOR 4 ANALOG CONTROLS

(6 BIT x 4)

.

4 BAND SWITCH OUTPUTS

(VHF I & III, UHF, CATV)

.

5 x 7 KEYBOARD

.

2 AUDIO VISUAL OUTPUTS (VCR & PC)

.

2 CODED MULTI STANDARD OUTPUTS

(e.g. PAL, SECAM, NTSC etc.)

.

DIRECT 11/2 DIGIT 7 SEGMENT COMMON

ANODE LED DISPLAY DRIVING

.

PCM REMOTE CONTROL RECEIVER

(M708 transmitter)

.

5-BIT DATA INPUT + CONTROL LINE FOR

P INTERFACE

.

LINEAR AFC DEFEAT OUTPUT

.

FLYBACK/SYNC. COINCIDENCE INPUT FOR

SEMI-AUTOMATIC SEARCH

.

STANDBY OUTPUT

.

OPTION SELECT : 16 OR 20 PROGRAMS

.

POWER UP MODE

.

PROGRAM SKIP DEFEAT

.

AV OPTIONS

.

1 * OR DECADE MODE OPTION IN 20 PRO-

GRAM OPTION

.

TEMPORARY ANALOG UP/DOWN INDICA-

TOR ON LED DISPLAY

.

BAND SKIP OPTION

.

455 TO 510kHz CHEAP CERAMIC RESONATOR

.

VDD =5V

± 5%. VPP = 25V ± 1V

DESCRIPTION

The M494 is a monolithic LSI integrated circuit

fabricated in SGS-THOMSON’s EPM2 process ; an

N-channel, Planox, double poly MOS process ca-

pable of including a floating gate NV memory cell

(EEPROM).

The i.c. has been designed as a complete digital

TV tuning system based on the voltage synthesis

principle and as a replacement for all the conven-

tional potentiometers and band switches particu-

larly in low cost TV sets. It also provides some

functions normally only associated with higher cost

sets. NV memory is integrated on the chip together

with all the necessary control circuitry to provide the

program memory. Separate NV memory is also

integrated to provide the memory for four analog

controls. A seven segment LED display can be

directly driven by the chip to display the program

selected, and the direction of movement of the

analog controls. Provision is made for a remote

control receiver both on and off chip, the latter is

interfaced via a data input and single control line.

(This enables control by a microprocessor). A local

keyboard can be used with the device in a variety

of configurations. An option select pin provides for

different program number options, power up op-

tions and skip associated functions. This device is

another significant step towards the complete inte-

gration of TV control circuitry.

The device is packaged in a 40 pin DIL plastic

package.

1/22

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