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| 型號： | MCP2140T-I/SS |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 7/58頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC IRDA CONTROLLR DTE/DCE 20SSOP |
| 標準包裝： | 1,600 |
| 控制器類型： | IRDA 標準協(xié)議?？刂破?br> |
| 接口： | UART |
| 電源電壓： | 3 V ~ 5.5 V |
| 電流 - 電源： | 2.2mA |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-SSOP（0.209"，5.30mm 寬） |
| 供應商設備封裝： | 20-SSOP |
| 包裝： | 帶卷 (TR) |
| 配用： | MCP2140DM-TMPSNS-ND - BOARD DEMO FOR MCP2140 |
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2003 Microchip Technology Inc.
Preliminary
DS21790A-page 15
MCP2140
2.10
Buffers and Throughput
The IR data rate of the MCP2140 is fixed at 9.6 kbaud.
The actual throughput will be less due to several fac-
tors. The most significant factors are under the control
of the developer. One factor beyond the control of the
designer is the overhead associated with the IrDA
standard. A throughput example is shown in Table 2-4.
Figure 2-9 shows the CTS waveform, what the state of
the buffers can be and the operation of the Host UART
and IR interfaces.
Figure 2-10 shows the screen-capture of a Host Con-
troller transmitting 240 bytes. Data is not transmitted
after CTS goes high (so only a maximum of 23 bytes of
the 29 byte buffer are utilized). Between data packets,
the CTS time can vary, depending on the Primary
Device (see blue circled CTS pulse in Figure 2-10).
TABLE 2-4:
THROUGHPUT
FIGURE 2-9:
HOST UART RECEIVE BUFFER AND CTS WAVEFORM
FIGURE 2-10:
HOST CONTROLLER TRANSMISSION OF A 240 BYTE PACKET
Bytes
Transferred
(3)
Bytes/
CTS Low
Time (S)
Effective
Baud Rate
240
23 (max) (1) 0.810133
2962 (1)
240
29
0.6500
3692 (2)
Note 1: Measured from Figure 2-10.
2: Interpolated from Figure 2-10.
3: 10 bits transferred for each byte.
Note:
IrDA throughput is based on many factors
associated with characteristics of the Pri-
mary and Secondary devices. These char-
acteristics may cause your throughput to
be more or less than is shown in Table 2-4.
CTS
Receive Buffer Empty
MCP2140 Can Receive Data Receive Buffer Has 22 Bytes,
Receive Buffer
Receive Buffer Empty
MCP2140 Can Receive Data
IR Data Packet Transmitted
Full (29 Bytes)
CTS Pin Driven High
IR Data Packet Starts Transmission
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