HCS362 datasheet(6/46 Pages) MICROCHIP

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HCS362

DS40189E-page 6

FIGURE 2-2:

I/O CIRCUITS

2.1

Architectural Overview

2.1.1

ONBOARD EEPROM

The HCS362 has an onboard non-volatile EEPROM,

which is used to store user programmable data. The

data can be programmed at the time of production and

include the security-related information such as

encoder keys, serial numbers, discrimination and seed

values. All the security related options are read

protected. The HCS362 has built in protection against

counter corruption. Before every EEPROM write, the

internal circuitry also ensures that the high voltage

required to write to the EEPROM is at an acceptable

level.

2.1.2

INTERNAL RC OSCILLATOR

The HCS362 has an onboard RC oscillator that con-

trols all the logic output timing characteristics. The

oscillator frequency varies within ±10% of the nominal

value (once calibrated over a voltage range of 2V –

3.5V or 3.5V – 6.3V). All the timing values specified in

this document are subject to the oscillator variation.

FIGURE 2-3:

HCS362 NORMALIZED TE VS.

TEMPERATURE

2.1.3

LOW VOLTAGE DETECTOR

A low battery voltage detector onboard the HCS362

can indicate when the operating voltage drops below a

predetermined value. There are eight options available

depending on the VLOW[0..2] configuration options.

The options provided are:

S0, S1, S2

ESD

Inputs

VDD

RFEN

S3 Input/

RDATA

DATA I/O

LED output

VDD

DATA

LEDH

LEDL

RFEN Output

PFET

NFET

PFET

ESD

NFET

ESD

SHIFT input

SHIFT

000

-2.0V

100 -4.0V

001

-2.1V

101 -4.2V

010

-2.2V

110 -4.4V

011

-2.3V

111 -4.6V

0.94

1.10

1.08

1.06

1.04

1.02

1.00

0.98

0.96

0.92

0.90

VDD Legend

= 2.0V

= 3.0V

= 6.0V

Typical

Temperature °C

-50-40-30-20-10 0 10 20 30 40 50 6070 80 90

Note:

Values are for calibrated oscillator

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