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MCP2200 bảng dữ liệu(PDF) 7 Page - Microchip Technology

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Giải thích chi tiết về linh kiện  USB 2.0 to UART Protocol Converter with GPIO
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 2010 Microchip Technology Inc.
DS22228A-page 7
MCP2200
1.7
EEPROM Module
The EEPROM module is a 256 byte array of nonvolatile
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 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
POR
A Power-on Reset 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 kOhm to 10 kOhm) to VDD. This
will eliminate external RC components usually needed
to create a Power-on Reset 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 nominally 12 Mb/s. The clock input
accuracy is ±0.25% (2,500 ppm maximum).
FIGURE 1-3:
QUARTZ CRYSTAL
OPERATION
FIGURE 1-4:
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.
2:
The value of RF is typically between
2M
 to 10 M.
Example: muRata
CSTCE12M0G15L
OSC1
OSC2
Resonator
12 MHz
MCP2200


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