Lantronix xPico xPico - Integration Guide - Page 27

General Purpose I/O Pins, Reset Pins, Signal, Description, xPico Wired, Reset, State, Internal pull-up

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2: Functional Description General Purpose I/O Pins xPico and xPico Wi-Fi contains eight pins which may be used as configurable inputs or outputs. Listed below are the configurable I/O pins. These pins are 3.3V CMOS logic level and 5V input tolerant. Table 2-14 Ethernet Interface xPico Serial Port Signals Signal Pin Description xPico Wired Description xPico Wi-Fi Reset State CP1 35 Configurable I/O Configurable I/O Input CP2/INT 26 Configurable I/O-External interrupt input Configurable I/O-SPI interrupt input Input CP3 28 Configurable I/O Configurable I/O- SPI MISO Input CP4 30 Configurable I/O Configurable I/O-SPI MOSI Input CP5 32 Configurable I/O Configurable I/O Input CP6 34 Configurable I/O Configurable I/O Input CP7 27 Configurable I/O Configurable I/O-SPI Clock Input CP8 3 Configurable I/O Configurable I/O-SPI Input Chip Select Note 1. For xPico Wi-Fi 5V tolerant pins, in order to sustain a voltage higher than Vcc+0.3, the internal pull-up/ pull-down resistors must be disabled. Reset Pins xPico and xPico Wi-Fi embedded device servers have two signals for use as reset signals. Signal EXT_RESET# is a hardware controlled input signal that will reboot the xPico processor when asserted low. Signal DEFAULT# is polled by the xPico software. When DEFAULT# is asserted low for six seconds, the unit will reset the system to the default manufacturing settings and reboot the unit. xPico Wi-Fi has an additional signal on pin 14 that can be used to wake up the unit processor when the unit is in a sleep or power down state. Signal Pin EXT_RESET# 38 DEFAULT# 36 WAKE (xPico 14 Wi-Fi only) Table 2-15 xPico Reset Signals Description Unit hardware reset, active low. Drive low to reboot unit. Unit reset to default, active low. Drive low to reset unit to default settings. Toggle signal from low to high to WAKE from SLEEP or Power down state Reset State Input Input Input Internal pull-up 10K (xPico) 40K (xPico Wi-Fi) Active 56K to 122K (xPico) 40K (xPico Wi-Fi) 40K xPico® Embedded Device Server Integration Guide 27

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2: Functional Description
General Purpose I/O Pins
xPico and xPico Wi-Fi contains eight pins which may be used as configurable inputs or
outputs.
Listed below are the configurable I/O pins.
These pins are 3.3V CMOS logic
level and 5V input tolerant.
Table 2-14
Ethernet Interface xPico Serial Port Signals
Signal
Pin
Description
xPico Wired
Description
xPico Wi-Fi
Reset
State
CP1
35
Configurable I/O
Configurable I/O
Input
CP2/INT
26
Configurable I/O-External interrupt input
Configurable I/O-SPI
interrupt input
Input
CP3
28
Configurable I/O
Configurable I/O- SPI
MISO
Input
CP4
30
Configurable I/O
Configurable I/O-SPI
MOSI
Input
CP5
32
Configurable I/O
Configurable I/O
Input
CP6
34
Configurable I/O
Configurable I/O
Input
CP7
27
Configurable I/O
Configurable I/O-SPI
Clock
Input
CP8
3
Configurable I/O
Configurable I/O-SPI
Chip Select
Input
Note 1. For xPico Wi-Fi 5V tolerant pins, in order to sustain a voltage higher than Vcc+0.3, the internal pull-up/
pull-down resistors must be disabled.
Reset Pins
xPico and xPico Wi-Fi embedded device servers have two signals for use as reset
signals.
Signal EXT_RESET# is a hardware controlled input signal that will reboot the
xPico processor when asserted low.
Signal DEFAULT# is polled by the xPico software.
When DEFAULT# is asserted low for six seconds, the unit will reset the system to the
default manufacturing settings and reboot the unit.
xPico Wi-Fi has an additional signal
on pin 14 that can be used to wake up the unit processor when the unit is in a sleep or
power down state.
Table 2-15
xPico Reset Signals
Signal
Pin
Description
Reset
State
Internal pull-up
EXT_RESET#
38
Unit hardware reset, active low.
Drive low to reboot unit.
Input
10K
(xPico)
40K (xPico Wi-Fi)
DEFAULT#
36
Unit reset to default, active low.
Drive low to reset unit to default
settings.
Input
Active 56K to
122K (xPico)
40K (xPico Wi-Fi)
WAKE (xPico
Wi-Fi only)
14
Toggle signal from low to high to
WAKE from SLEEP or Power
down state
Input
40K
xPico® Embedded Device Server Integration Guide
27