參數(shù)資料
型號(hào)： MCP2122-E/PG
廠商： Microchip Technology
文件頁(yè)數(shù)： 34/34頁(yè)
文件大?。?/td> 0K
描述： IC ENCODER/DECODER INFRARED 8DIP
標(biāo)準(zhǔn)包裝： 60
類型： 紅外線編碼器/解碼器
應(yīng)用： 數(shù)據(jù)記錄，數(shù)據(jù)交換
電壓 - 電源，模擬： 1.8 V ~ 5.5 V
電壓 - 電源，數(shù)字： 1.8 V ~ 5.5 V
安裝類型： 通孔
封裝/外殼： 8-DIP（0.300"，7.62mm）
供應(yīng)商設(shè)備封裝： 8-PDIP
包裝： 管件
配用： MCP212XDM-ND - BOARD DEVELOPMENT IRDA
2004 Microchip Technology Inc.
Preliminary
DS21894B-page 9
MCP2122
2.5.3
ENCODING AND SCREEN
CAPTURES
Table 2-4 shows the TXIR pin high-time at different
common baud rates. The internal TXIR pulse-width
high-time limiter is a feature that minimizes the system
current consumption at lower baud rates. The IrDA
standard specification requires that optical receiver cir-
cuitry detect pulses as narrow as 1.41 s (1.63 s is
the typical time at 115200 baud). Therefore, the time
that the TXIR pin is high after this valid detection is
additional current that is driven by the emitter LED. The
MCP2122 will force the TXIR pin low once the pulse-
width limiter has timed out. Figure 2-9 shows the
MCP2122 16XCLK, TX and TXIR waveforms at
115200 baud for a single TX low bit. In this case, the
TXIR is high for three 16XCLK pulses. In Figure 2-10,
the MCP2122 is at 9600 baud for a single TX low bit. In
this case, the TXIR is high for 3.55 s (determined by
pulse-width limiter circuit).
TABLE 2-4:
TXIR HIGH PULSE WIDTH
FIGURE 2-9:
MCP2122 AT 115200 BAUD WAVEFORM
Baud
Rate
TXIR Pulse Width
3xT16XCLK
Circuit
Pulse-width
Limiter (2)
Circuit
Actual Pulse
Width
9600
19.53 s (1)
4.00 s
4.00 s (3)
19200
9.77 s (1)
4.00 s
4.00 s (3)
38400
4.88 s (1)
4.00 s
4.00 s (3)
57600
3.26 s
4.00 s
3.26 s
115200
1.63 s
4.00 s
1.63 s
Note 1: The pulse-width limiter on the TXIR pin
saves system current for this baud rate.
2: This TXIR pulse width time is a design
target and is not tested. Actual times may
be greater than, or less than, this value.
3: This time (determined by the pulse-width
limiter circuit) is device dependent.
1 2 3 4 5 678 9 10 11 12 13 14 15 16
Jitter of the TX input relative to the 16XCLK and TXIR
16XCLK Pulse
AB
TXIR
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