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| 型号： | ADM00310 |
| 厂商： | Microchip Technology |
| 文件页数： | 43/44页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR MCP3903 AFE |
| 产品培训模块： | MCP3903 6-Channel Energy Measurement Analog Front End |
| 设计资源： | MCP3903 Eval Brd BOM MCP3903 Eval Brd Schematic |
| 标准包装： | 1 |
| 主要目的： | 接口，模拟前端（AFE） |
| 嵌入式： | 是，MCU，16 位 |
| 已用 IC / 零件： | MCP3903，PIC24F，PIC24H，dsPIC33，MCP2200 |
| 已供物品： | 板，2 个模块，线缆，CD，电源 |
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MCP2200
DS22228B-page 8
2011 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 nonvolatile
memory. The memory locations are accessed for
read/write operations via USB host commands. Refer
to Section 2.0 “Configuration” for details on access-
ing 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
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 kOhm to 10 kOhm) 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 nominally 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.
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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