2: Functional Description
xPico® 110 Wired Device Server Integration Guide
9
PCB Interface
The xPico 110 unit has a serial interface compatible with data rates up to 921,600 bps (in high-
performance mode). The serial signals (
RX, TX, RTS, CTS, and all CPs
) are 3.3V CMOS logic level
and 5V tolerant. The serial interface pins i3.3V, ground, and reset. The serial signals
usually connect to an internal device, such as a UART. For applications requiring an external
cable running with RS-232 or RS422/485 voltage levels, the xPico 110 device must be designed
with an external serial transceiver chip with appropriate protocol. All configurable I/O pins are
3.3V CMOS logic level and 5V input tolerant.
An external Ethernet magnetic module and RJ45 is required to interface the xPico 110 to a
standard 10/100Mbps Ethernet network.
Shown below is the xPico 110 pin connection diagram.
Table 2-3 xPico 110 PCB Interface Signals
Signal Name
Pin #
Primary
Function
Reset
State
Internal
Pull-up
Driver
Strength
POWER, GROUND, AND UNUSED PINS
GND
1, 3, 5, 20, 23, 24,
27, 32, 35, 36, 58,
60, 61, 64, 65, 69, 70
Ground pins for
Signal and Power
THERMAL PAD
GND
71, 72, 73, 74, 75, 76
Power Ground and
heat relief
+3.3V
48, 49, 50
3.3V Input Power
RESERVED
18, 19, 29, 30
Reserved pins. Do
not use, leave them
open
NC
2, 4, 21, 22, 39, 59
No internal
connection
ETHERNET SIGNALS
ETX+
25
Ethernet Transmit
Differential
(positive)
Output
ETX-
26
Ethernet Transmit
Differential
(negative)
Output
ETCT
28
Ethernet Transmit
Center Tap
ERX+
33
Ethernet Receive
Differential
(positive)
Input
ERX-
34
Ethernet Receive
Differential
(negative)
Input
ERCT
31
Ethernet Receive
Center Tap
