MCP2200T-ISLASHSS datasheet(8/44 Pages) MICROCHIP

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MCP2200

DS20002228C-page 8

 2011-2015 Microchip Technology Inc.

1.6.1.3

RxLED Pin Function (IN Message)

The ‘Rx’ in the pin name is in respect to the USB host.

The RxLED pin is an indicator for USB ‘IN’ messages.

This pin will either pulse low for a period of time

(configurable for ~100 ms or ~200 ms), or toggle to the

opposite

state

for

every

message

received

(IN message) by the USB host. This allows the

application to count messages or provide a visual

indication of USB traffic.

1.6.1.4

TxLED Pin Function (OUT Message)

The ‘Tx’ in the pin name is in respect to the USB host.

The TxLED pin is an indicator for USB ‘OUT’

messages.

This pin will either pulse low for a period of time

(configurable for ~100 ms or ~200 ms), or toggle to the

opposite state for every message transmitted (OUT

message) by the USB host. This allows the application

to count messages or provide a visual indication of

USB traffic.

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 via USB host commands. Refer

to Section 2.0 “Configuration” for details on accessing

the EEPROM. 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.

The host should wait for the write cycle to complete and

then verify the write by reading the byte(s).

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. These devices have a noise filter in

the Reset path which detects and ignores small pulses.

1.8.2

POWER-ON RESET (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 kΩ to 10 kΩ) 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),

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 defined as 12 Mb/s. The clock input

accuracy is ±0.25% (2,500 ppm maximum).

FIGURE 1-6:

QUARTZ CRYSTAL

OPERATION

FIGURE 1-7:

CERAMIC RESONATOR

OPERATION

Quartz Crystal

12 MHz

OSC1

OSC2

RS(1)

RF(2)

MCP2200

Note 1:

A series resistor (RS) may be required

for quartz crystals with high drive level.

The value of RF is typically between

 to 10 M..

Example: Murata®

CSTCE12M0G15L

OSC1

OSC2

Resonator

12 MHz

MCP2200

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