MCP2140 Microchip Technology, Inc., MCP2140 Datasheet - Page 5

• Manufacturer Part Number: MCP2140
• Description: The MCP2140 Embeds Irda Protocol Handling And Bit Encoding/decoding, And Provides The Lowest Cost, Lowest Power Consumption Solution For Adding Irda Connectivity to Embedded Systems
• Manufacturer: Microchip Technology, Inc.

TABLE 1-2:
RXPDREF
TXIR
PHACT
RESET
V
NC
TX
RX
RI
DSR
DTR
CTS
Legend:
Pin Name
SS
2003 Microchip Technology Inc.
1: The state of the DTR output pin does not reflect the state of the DTR bit of the IrDA Primary Device.
TTL = TTL compatible input
A = Analog
CMOS = CMOS compatible input
I = Input
PDIP
10
12
11
1
2
3
4
5
6
7
8
9
MCP2140 PIN DESCRIPTION NORMAL OPERATION (DCE)
Pin Number
SOIC SSOP
10
12
11
1
2
3
4
5
6
7
8
9
5, 6
10
12
13
11
1
2
3
4
7
8
9
Type
Pin
OC
—
O
O
O
O
I
I
I
I
I
I
Buffer
Type
OC = Open collector output
ST = Schmitt Trigger input with CMOS levels
P = Power
O = Output
TTL
TTL
TTL
ST
Preliminary
—
—
—
—
—
—
A
P
IR Receive Photo Detect Diode reference voltage. This
voltage will typically be in the range of V
Asynchronous transmit to IrDA transceiver.
Protocol Handler Active. Indicates the state of the MCP2140
Protocol Handler. This output is an open collector, so an
external pull-up resistor may be required.
1 = Protocol Handler is in the Discovery or NRM state
0 = Protocol Handler is in NDM state or the MCP2140 is
Resets the Device
Ground reference for logic and I/O pins
No connect
Asynchronous receive; from Host Controller UART
Asynchronous transmit; to Host Controller UART
Ring Indicator. The state of this bit is communicated to the
IrDA Primary Device.
1 = No Ring Indicate Present
0 = Ring Indicate Present
Data Set Ready. Indicates that the MCP2140 has estab-
lished a valid IrDA link with a Primary Device
is locally emulated and not related to the DTR bit of the IrDA
Primary Device.
1 = An IR link has not been established
0 = An IR link has been established (IR Link)
Data Terminal Ready. Indicates that the Embedded device
connected to the MCP2140 is ready for IR data. The state of
this bit is communicated to the IrDA Primary Device via the
IrDA DSR bit carried by IrCOMM.
1 = Embedded device not ready
0 = Embedded device ready
Clear to Send. Indicates that the MCP2140 is ready to
receive data from the Host Controller. This signal is locally
emulated and not related to the CTS/RTS bit of the IrDA
Primary Device.
1 = Host Controller should not send data
0 = Host Controller may send data
in Low Power mode
(No IR Link)
Description
MCP2140
DD
/2.
DS21790A-page 5
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. This signal