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參數(shù)資料
| 型號： | MCP2140 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | IrDA Standard Protocol Stack Controller With Fixed 9600 Baud Communication Rate(固定波特率,低成本,IrDA標準協(xié)議編譯碼器) |
| 中文描述： | 標準的IrDA協(xié)議?？刂破?，固定通信速率9600波特（固定波特率，低成本，紅外標準協(xié)議編譯碼器） |
| 文件頁數(shù)： | 14/58頁 |
| 文件大小： | 1001K |
| 代理商： | MCP2140 |
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MCP2140
DS21790A-page 14
Preliminary
2003 Microchip Technology Inc.
2.8
Minimizing Power
During IR communication between a Primary Device
and the MCP2140, the MCP2140 is in an operational
mode. In this mode, the MCP2140 consumes the
operational current (
Parameter D010
).
For many applications, the time that IR communication
is occurring is a small percentage of the applications
operational time. The ability for the IR controller to be
in a low power mode during this time will save on the
applications power consumption. The MCP2140 will
automatically enter a low power mode once IR activity
has stopped and will return to operational mode once
IR activity is detected on the RXPD and RXPDREF
pins.
Another way to minimize system power is to use an I/O
pin of the Host Controller to enable power to the IR
circuity
2.8.1
AUTOMATIC LOW POWER MODE
The Automatic Low Power mode allows the system to
achieve the lowest possible operating current.
When the IR link has been “closed”, the protocol han-
dler state machine returns to the Normal Disconnect
Mode (NDM). During NDM, if no IR activity occurs for
about 10 seconds, the device is disabled and enters
into Low Power mode. In this mode, the device oscilla-
tor is shut down and the PHACT pin will be low
(
Parameter D010A
).
Table 2-3
shows the MCP2140 current. These are
specified in
Parameter D010
and
Parameter D010A
.
TABLE 2-3:
DEVICE MAXIMUM
OPERATING CURRENT
2.8.2
RETURNING TO DEVICE
OPERATION
The device will exit the Low Power mode when the
RXPD pin voltage crosses the REPDREF pin reference
voltage.
A device reset will also cause the MCP2140 to exit Low
Power mode. After device initialization, if no IR activity
occurs for about 10 seconds, the device is disabled and
returns into the Low Power mode.
2.9
PHACT Signal
The PHACT signal indicates that the MCP2140 Proto-
col Handler is active. This output pin is an open collec-
tor, so when interfacing to the Host Controller, a pull-up
resistor is required.
Mode
Current
Comment
PHACT = H
2.2 mA
IR communications is
occurring.
No IR communications.
PHACT = L
Note:
60 μA
Additional system current is from the
Receiver/Transmitter circuitry.
Note:
For proper operation, the device oscillator
must be within oscillator specification in
the
time
frame
Parameter IR140
.
specified
in
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