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| 型号： | MCP2140A-I/SS |
| 厂商： | Microchip Technology |
| 文件页数： | 7/66页 |
| 文件大小： | 0K |
| 描述： | IC IRDA CONTROLLR DTE/DCE 20SSOP |
| 标准包装： | 67 |
| 控制器类型： | IRDA 标准协议栈控制器 |
| 接口： | UART |
| 电源电压： | 3 V ~ 5.5 V |
| 电流 - 电源： | 2.2mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 20-SSOP |
| 包装： | 管件 |
| 产品目录页面： | 685 (CN2011-ZH PDF) |
| 配用： | MCP2140DM-TMPSNS-ND - BOARD DEMO FOR MCP2140 |
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2007-2011 Microchip Technology Inc.
DS22050B-page 15
MCP2140A
2.8
Minimizing Power
During IR communication between a primary device
and the MCP2140A, the MCP2140A is in an opera-
tional mode. In this mode, the MCP2140A consumes
the operational current (Parameter D010A).
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 MCP2140A 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. The PHACT pin indicates if the protocol handler is
active or inactive (Low Power mode).
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
handler 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
oscillator is shut down and the PHACT pin will be low
Table 2-3 shows the MCP2140A current. These are
specified in Parameter D010A and Parameter D010B.
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 MCP2140A to exit
Low Power mode. After device initialization, if no IR
activity occurs for about 10 seconds, the device returns
to 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 407 A IR communication is occur-
ring (or waiting for timeout).
PHACT = L
23 A
No IR communications.
Note:
Additional system current is from the
receiver/transmitter and the RXPDREF
voltage reference circuitry.
Note:
For proper operation, the device oscillator
must be within oscillator specification in
the time frame specified in Parameter
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