MCP2140-I/SO Microchip Technology, MCP2140-I/SO Datasheet - Page 7

• Manufacturer Part Number: MCP2140-I/SO
• Description: IC IRDA CONTROLLR DTE/DCE 18SOIC
• Manufacturer: Microchip Technology

Specifications of MCP2140-I/SO

• Package / Case: 18-SOIC (7.5mm Width)
• Controller Type: IRDA Standard Protocol Stack Controller
• Interface: UART
• Voltage - Supply: 3 V ~ 5.5 V
• Current - Supply: 2.2mA
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: MCP2140DM-TMPSNS - BOARD DEMO FOR MCP2140
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

2.0
The MCP2140 serial interface and IR baud rates are
fixed at 9600 baud, given a 7.3728 MHz device clock.
2.1
Any time the device is powered up
the Power-Up Timer delay
lowed by an Oscillator Start-up Timer (OST) delay
(Parameter
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
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
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
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
device communication at 9600 baud.
2003 Microchip Technology Inc.
DEVICE OPERATION
Power-Up
Device Reset
Device Clocks
CLOCK SOURCE
32). Once these delays complete, commu-
(Parameter
(Parameter
Parameter
33) occurs, fol-
D003),
1A) for
Preliminary
2.3.1.1
A crystal or ceramic resonator can be connected to the
OSC1 and OSC2 pins to establish oscillation
(Figure
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:
TABLE 2-1:
TABLE 2-2:
See
values of C1 and C2.
Note:
Note:
7.3728 MHz
Note:
7.3728 MHz
Freq
Table 2-1
2-1). The MCP2140 oscillator design requires
Freq
C1
C2
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.
Higher capacitance increases the stability
of the oscillator but also increases the start-
up time. These values are for design guid-
ance only. R
overdriving crystals with low drive level
specification. Since each crystal has its
own characteristics, the user should con-
sult
appropriate values of external components.
A series resistor may be required for
AT strip cut crystals.
Crystal Oscillator / Ceramic
Resonators
(Note)
RS
XTAL
and
CAPACITOR SELECTION FOR
CERAMIC RESONATORS
CAPACITOR SELECTION FOR
CRYSTAL OSCILLATOR
the
OSC2
OSC1
OSC1 (C1)
15 - 30 pF
CRYSTAL OPERATION
(CERAMIC RESONATOR)
Table 2-2
OSC1 (C1)
S
crystal
10 - 22 pF
may be required to avoid
RF
MCP2140
for recommended
manufacturer
MCP2140
DS21790A-page 7
OSC2 (C2)
15 - 30 pF
OSC2 (C2)
10 - 22 pF
To internal
logic
for