MCP2200
1.7
EEPROM Module
1.9
Oscillator
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
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).
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
MCP2200
OSC1
1.8
1.8.1
RESET/POR
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.
R
F
(2)
1.8.2
POR
A Power-on Reset pulse is generated on-chip
whenever V
DD
rises above a certain threshold. This
allows the device to start in the initialized state when
V
DD
is adequate for operation.
To take advantage of the POR circuitry, tie the RST pin
through a resistor (1 kOhm to 10 kOhm) to V
DD
. 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.
Quartz Crystal
12 MHz
R
S
(1)
OSC2
Note 1:
A series resistor (R
S
) may be required
for quartz crystals with high drive level.
2:
The value of R
F
is typically between
2 M to 10 M.
FIGURE 1-4:
CERAMIC RESONATOR
OPERATION
Example: muRata
CSTCE12M0G15L
MCP2200
OSC1
OSC2
Resonator
12 MHz
2010 Microchip Technology Inc.
DS22228A-page 7
MICROCHIP [ MICROCHIP TECHNOLOGY ]
