MCP2210 datasheet(8/82 Pages) MICROCHIP

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MCP2210

DS22288A-page 8

 2011 Microchip Technology Inc.

1.7

EEPROM Module

The EEPROM module is a 256-byte array of nonvola-

tile memory. The memory locations are accessed for

read/write operations solely via USB host commands.

The memory cells for data EEPROM are rated to

endure thousands of erase/write cycles, up to 100K for

EEPROM.

Data retention without refresh is conservatively

estimated to be greater than 40 years.

1.8

Reset/POR

1.8.1

RESET PIN

The RST pin provides a method for triggering an

external Reset of the device. A Reset is generated by

holding the pin low. MCP2210 has a noise filter in the

Reset path which detects and ignores small pulses.

1.8.2

POR

A POR pulse is generated on-chip whenever VDD rises

above a certain threshold. This allows the device to

start in the initialized state when VDD is adequate for

operation.

To take advantage of the POR circuitry, tie the RST pin

through a resistor (1 k

 to 10 k) to VDD. This will

eliminate external RC components usually needed to

create a POR delay.

When the device starts normal operation (i.e., exits the

Reset condition), the device operating parameters

(voltage, frequency, temperature, etc.) must be met to

ensure operation. If these conditions are not achieved,

the device must be held in Reset until the operating

conditions are met.

1.9

Oscillator

The input clock must be 12 MHz to provide the proper

frequency for the USB module. USB full-speed is

nominally 12 Mb/s. The clock input accuracy is ±0.25%

(2,500 ppm maximum).

FIGURE 1-5:

QUARTZ CRYSTAL

OPERATION

FIGURE 1-6:

CERAMIC RESONATOR

OPERATION

Quartz Crystal

12 MHz

OSC1

OSC2

RS(1)

RF(2)

MCP2210

Note 1: A series resistor (RS) may be required for

quartz crystals with high drive level.

2: The value of RF is typically between 2 M to

10 M

..

Example: muRata®

CSTCE12M0G15L

OSC1

OSC2

Resonator

12 MHz

MCP2210

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