Datasheet

MCP2120
DS21618B-page 4 © 2007 Microchip Technology Inc.
TABLE 1-2: PIN DESCRIPTION USER MODE
Pin Name
Pin Number
Pin
Type
Buffer
Type
PDIP SOIC Description
VDD 1 1 — P Positive supply for logic and I/O pins
OSC1/CLKIN 2 2 I CMOS Oscillator crystal input/external clock source input
OSC2 3 3 O — Oscillator crystal Output
RESET 4 4 I ST Resets the Device
RXIR 5 5 I ST Asynchronous receive from infrared transceiver
TXIR 6 6 O — Asynchronous transmit to infrared transceiver
MODE 7 7 I TTL Selects the device mode (Data/Command) for Software Baud
Rate operation. For more information see Section 2.4.1.2 “Soft-
ware Selection”.
BAUD2 8 8 I TTL BAUD2:BAUD0 specify the Baud rate of the device, or if the
device operates in Software Baud Rate mode. For more informa-
tion see Section 2.4.1 “Baud Rate”.
BAUD1 9 9 I TTL
BAUD0 10 10 I TTL
RX 11 11 O — Asynchronous transmit to controller UART
TX 12 12 I TTL Asynchronous receive from controller UART
EN 13 13 I — Device Enable.
V
SS 14 14 — P Ground reference for logic and I/O pins
Legend: TTL = TTL compatible input ST = Schmitt Trigger input with CMOS levels
I = Input O = Output
P = Power CMOS = CMOS compatible input