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| 型號： | MCP2200T-I/SS |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 3/34頁 |
| 文件大小： | 0K |
| 描述： | IC USB 2.0 - UART 20SSOP |
| 標(biāo)準(zhǔn)包裝： | 1,600 |
| 特點(diǎn)： | USB 至 UART |
| 通道數(shù)： | 8 |
| FIFO's： | 256 字節(jié) |
| 規(guī)程： | USB 2.0 |
| 電源電壓： | 3 V ~ 5.5 V |
| 帶自動(dòng)流量控制功能： | 是 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-SSOP（0.209"，5.30mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 20-SSOP |
| 包裝： | 帶卷 (TR) |
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2010-2011 Microchip Technology Inc.
DS22230D-page 11
MCP2003/4/3A/4A
1.6
MCP2003/4 and MCP2003A/4A
Difference Details
The differences between the MCP2003/4 and the
MCP2003/4A devices are isolated to the wake-up
functionality. The changes were implemented to make
the device more robust to LIN bus conditions, outside
of the normal operating conditions. The MCP2003/4
will wake-up from Power Down Mode during any LIN
falling edge held low longer than 20us.
In the case where a LIN system is designed to
minimize stand-by current by disconnecting all bus
pull-ups resistors (including the external master pull-
up resistor to VBB), the original MCP2003/4 could
wake up, if the floating bus drifted to a valid low level.
The MCP2003/4A revisions were modified to require a
rising edge after a valid low level. This will prevent an
undesired system wake-up in this scenario, while
maintaining functional capability with the original
version.
It should be noted that the original MCP2003/4 meets
all LIN transceiver specification requirements and
modules can be designed to pass all LIN system
requirements. However, when all bus pull-up resistors
are disconnected, the MCP2003/4 requires the
module designer to write firmware to monitor the LIN
Bus after any wake-up event to prevent the transceiver
from automatically transitioning from Ready mode to
Operational mode.
If the MCP2003/4 is placed into Operational mode,
VBB-LBUS pull-up resistor is automatically connected,
which will raise the LIN bus to a recessive level; then
putting the device to Power-Down mode may cause
LBUS to be floating, and thus wake up all bus nodes.
To prevent this, the designer should insure TXD
(MCP2003) or TXE (MCP2004) is held low until valid
bus activity is verified (see Figure 1-6). This will
ensure the transceiver transitions from Ready mode to
Transmitter Off mode, until bus activity can be verified.
In the case of valid bus activity, the transceiver can
shift to Operation mode, while if there is no bus
activity, the device can be again placed into Power
Down. The design practices needed to accomplish this
are fully detailed in Tech Brief TB3067 - “MCP2003
Power-Down Mode and Wake-Up Handling in Case
of LIN Bus Loss” (DS93067).
The revised MCP2003/4A devices now eliminate the
need for firmware to prevent system wide wake-up.
The revised devices now require a longer valid bus
low (see updated tBDB value in the Specification
tables and FIGURE 2-7: “MCP2003A/4A Remote
Wake-up”), which enables a rising edge detect circuit.
The device will now only wake up after a rising edge,
following a low longer than tBDB. While the module
designer can still hold TXD (MCP2003) or TXE
(MCP2004) low during wake-up, to enter Transmitter
Off mode from Ready mode, it is not required to
prevent an advertent system wake-up.
In addition to the longer tBDB value, the time from
wake-up detect to VREN enable is shortened as
documented in the Specification table.
FIGURE 1-6:
MCP2003/2004 Switching Timing Diagram for the Forced Power-Down Mode
Sequence
TXD
VREN
CS
Ready
Mode
Transmitter OFF
Mode
Power Down
Mode after Master
Sleep instruction
Power Down
Mode
tTx2CS >= 100ns
tCSactive >= 100s
TXD to 0
forced
externally
TXD state depending
on how the Slave
Microcontroller is
powered
LBUS
State
LIN bus
disconnected
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