RFHCS362G datasheet(10/54 Pages) MICROCHIP

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rfHCS362G/362F

DS41189B-page 10

FIGURE 2-2:

I/O CIRCUITS

2.1

Encoder Architectural Overview

2.1.1

ONBOARD EEPROM

The rfHCS362G/362F has an onboard nonvolatile

EEPROM which is used to store user programmable

data. The data can be programmed at the time of pro-

duction and includes the security-related information

such as encoder keys, serial numbers, discrimination

and seed values. All the security related options

are read protected. The rfHCS362G/362F 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 rfHCS362G/362F has an onboard RC oscillator

that controls 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:

TYPICAL rfHCS362G/362F

NORMALIZED OSCILLATOR

PERIOD VS. TEMPERATURE

S0, S1, S2,

Inputs

VDD

RFEN

S3 Input/

RDATA

DATA I/O

LED output

VDD

DATA

LEDH

LEDL

RFEN Output

PFET

NFET

PFET

NFET

SHIFT input

SHIFT

RFENIN

NFET

FSKOUT OUTPUT

ANT1, ANT2 outputs

CLKOUT

VDDRF

PFET

NFET

PS/DATAASK

VDDRF

PLL Lock

μA

VDDRF

VCO

5 pF

200

Change

Pump

RFENIN input

XTAL

output

DATAFSK input

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

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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