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)： 7/58頁
文件大?。?/td> 1001K
代理商： MCP2140
2003 Microchip Technology Inc.
Preliminary
DS21790A-page 7
MCP2140
2.0
DEVICE OPERATION
The MCP2140 serial interface and IR baud rates are
fixed at 9600 baud, given a 7.3728 MHz device clock
.
2.1
Power-Up
Any time the device is powered up (
Parameter D003
),
the Power-Up Timer delay (
Parameter 33
) occurs, fol-
lowed by an Oscillator Start-up Timer (OST) delay
(
Parameter 32
). Once these delays complete, commu-
nication with the device may be initiated. This commu-
nication is from both the infrared transceiver’s side and
the controller’s UART interface.
2.2
Device Reset
The MCP2140 is forced into the reset state when the
RESET pin is in the low state. Once the RESET pin is
brought to a high state, the Device Reset sequence
occurs. Once the sequence completes, functional
operation begins.
2.3
Device Clocks
The MCP2140 requires a clock source to operate. This
clock source is used to establish the device timing,
including the device “Bit Clock”.
2.3.1
CLOCK SOURCE
The clock source can be supplied by one of the
following:
Crystal
Resonator
External clock
The frequency of this clock source must be
7.3728 MHz (electrical specification
Parameter 1A
) for
device communication at 9600 baud.
2.3.1.1
Crystal Oscillator / Ceramic
Resonators
A crystal or ceramic resonator can be connected to the
OSC1 and OSC2 pins to establish oscillation
(
Figure 2-1
). The MCP2140 oscillator design requires
the use of a parallel-cut crystal. Use of a series of cut
crystals may give a frequency outside of the crystal
manufacturers specifications.
FIGURE 2-1:
CRYSTAL OPERATION
(CERAMIC RESONATOR)
TABLE 2-1:
CAPACITOR SELECTION FOR
CERAMIC RESONATORS
TABLE 2-2:
CAPACITOR SELECTION FOR
CRYSTAL OSCILLATOR
Freq
OSC1 (C1)
OSC2 (C2)
7.3728 MHz
10 - 22 pF
10 - 22 pF
Note:
Higher capacitance increases the stability
of the oscillator, but also increases the
start-up time. These values are for design
guidance only. Since each resonator has its
own characteristics, the user should consult
the resonator manufacturer for appropriate
values of external components.
Freq
OSC1 (C1)
OSC2 (C2)
7.3728 MHz
15 - 30 pF
15 - 30 pF
Note:
Higher capacitance increases the stability
of the oscillator but also increases the start-
up time. These values are for design guid-
ance only. R
S
may be required to avoid
overdriving crystals with low drive level
specification. Since each crystal has its
own characteristics, the user should con-
sult
the
crystal
appropriate values of external components.
manufacturer
for
See
Table 2-1
and
Table 2-2
for recommended
values of C1 and C2.
Note:
A series resistor may be required for
AT strip cut crystals.
C1
C2
XTAL
OSC2
RS
(Note)
OSC1
RF
To internal
logic
MCP2140
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