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| 型号： | MCP2120T-I/SL |
| 厂商： | Microchip Technology |
| 文件页数： | 33/36页 |
| 文件大小： | 0K |
| 描述： | IC ENCODR/DECODR 2.5V IR 14-SOIC |
| 标准包装： | 2,600 |
| 类型： | 红外线编码器/解码器 |
| 电压 - 电源，模拟： | 2.5 V ~ 5.5 V |
| 电压 - 电源，数字： | 2.5 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 14-SOIC |
| 包装： | 带卷 (TR) |
| 配用： | MCP212XDM-ND - BOARD DEVELOPMENT IRDA |
| 其它名称： | MCP2120TI/SL |
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MCP2120
DS21618B-page 6
2007 Microchip Technology Inc.
2.4.1.2
Software Selection
When the BAUD2:BAUD0 pins are configured as ’111’
the MCP2120 defaults to a baud rate of FOSC / 768.
To place the MCP2120 into Command Mode, the
MODE pin must be at a low level. When in this mode,
any data that is received by the MCP2120’s UART is
"echoed" back to the controller and no encoding/
decoding occurs. The echoed data will be skewed less
than 1 bit time (see parameter IR141). When the
MODE pin goes high, the device is returned to Data
Mode where the encoder/decoder is in operation.
Table 2-2 shows the software hex commands to config-
ure the MCP2120’s baud rate.
The MCP2120 receives data bytes at the existing baud
rate. When the change baud rate command (0x11) is
received, the last valid baud rate value received
becomes the new baud rate. The new baud rate is
effective after the stop bit of the echoed data.
Figure 2-2 shows this sequence.
2.4.2
TRANSMITTING
When the controller sends serial data to the MCP2120,
the baud rates are required to match.
There will be some jitter on the detection of the high to
low edge of the start bit. This jitter will affect the place-
ment of the encoded start bit. All subsequent bits will be
16 BITCLK times later.
2.4.3
RECEIVING
When the controller receives serial data from the
MCP2120, the baud rates are required to match.
There will be some jitter on the detection of the high to
low edge of the start bit. This jitter will affect the place-
ment of the decoded Start bit. All subsequent bits will
be 16 BITCLK times later.
FIGURE 2-1:
Data/Command Mode
Flow
TABLE 2-2:
SOFTWARE BAUD RATE SELECTION VS. FREQUENCY
MODE pin goes low
Data Mode
Command Mode
Controller sends baud
MCP2120 echoes baud
Controller sends 0x11
MCP2120 echoes 0x11
New baud rate
MODE pin goes high
Data Mode
When echoing the Data, once the first bit is
detected, it is echoed back. This means that
the echoed data is skewed no more than 1 bit
time.
The new baud rate can occur once the echoed
stop bit completes.
Hex
Command(3, 4)
Frequency (MHz)
Bit Rate
0.6144(1)
2.000
3.6864
4.9152
7.3728
14.7456(2) 20.000(2)
0x87
800
2604
4800
6400
9600
19200
26042
FOSC / 768
0x8B
1600
5208
9600
12800
19200
38400
52083
FOSC / 384
0x85
3200
10417
19200
25600
38400
78600
104167
FOSC / 192
0x83
4800
15625
28800
38400
57600
115200
156250
FOSC / 128
0x81
9600
31250
57600
78600
115200
230400
312500
FOSC / 64
Note 1: An external clock is recommended for frequencies below 2 MHz.
2: For frequencies above 7.3728 MHz, the TXIR pulse width (parameter IR121) will be shorter than the 1.6 s
IrDA standard specification.
3: Command 0x11 is used to change to the new baud rate.
4: All other command codes are reserved for possible future use.
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