ST7282A5 - ST7282B5 - ROM FROM EPROM

Family

Issuer Ref.

Chrono

March 26, 1997

Previous Ref

Edition

ST7

PG-RO

97115

7282A5B5

Target C

Page 3/23

1.1 Quick Reference

The ST7282A5/B5 is a 32K ROM version of the

ST72 family, using the ST72CORE and N-Well

technology.

It is derived from EPROM M4 version replacing

EPROM by ROM.

Two different commercial products are supported

by this device : ST7282A5 (no LCD driver) func-

tionnality described in specification SD70KL1618

ed. F) and ST7282B5 (LCD driver) functionnality

described in specification 96096 ed. B).

It contains an LCD controller/driver with 20 seg-

ment and 16 backplane outputs able to drive up to

20 x 16 = 320 segments.

The LCD control logic reads automatically data

from the

LCD-RAM independently from the

ST7282 B5.

Further it contains up to 62 I/O pins, 24 of them

can be used as analog inputs to the 8 bit analog-

digital converter. Each digital I/O pin can individu-

ally be defined by software to work in one of the

following modes: open-drain output, push pull out-

put, input, input with pull-up (23 pins only) or inter-

rupt input with pull up (23 pins only). 3 of the digital

I/O pins serve as interface to the SIO. On pin PA4

the pull-up resistor is desactivated.

Port pins PD, PE, PF, PG and PH are multiplexed

with LCD Segment and backplane pins.

A 512 byte EEPROM for non volatile storage of

data is available. The programming voltage for

that device is generated on chip without external

components. So no extra supply is necessary. 16

bytes are protected against external readout.

One interrupt vector is connected to the I/O ports.

Five more interrupt vectors are available for the

timer, the ADC, the serial I/O interface and the

Group & Block Sync module (2). The watchdog

can be set by the user in 64 increments from

2.8msec to 182msec ( f

A synchronous 8 bit serial interface for serial data

IN/OUT is also implemented.

RDS signals can be decoded with the help of RDS

filter, RDS demodulator and Group & Block Sync

module.

1.2 Parameters

The values below substitute the corresponding values in the specifications of dedicated functions.

1.2.1 Absolute maximum ratings

1.2.2 Recommended operating conditions

The maximum accumulated current of all I/O pins

* except LCD pins

** MIL 883B Mode, 100pF through 1.5k

Supply voltage

-0.3 ... +7V

Input voltage*

Output voltage*

Input current

-10 ... +10mA

Output current*

-10 ... + 10mA

Power dissipation

tbd

Storage temperature

-55 ... +125°C

Operation temperature

-40 ... +85°C

Display voltage

Output voltage Seg+COM

ESD

ESD

2500V

LU susceptibility

LU

Supply voltage

4.5 ... 5.5V

Supply votage difference

50mV