User's Manual

PW2050 Embedded Device Server Integration Guide 24
Reset Pins
PW2050 embedded device servers have two signals for use as reset signals. Signal
EXT_RESET# is a hardware controlled input signal that will reboot the PW2050 processor
when asserted low. Signal DEFAULT# is polled by the PW2050 software. When DEFAULT#
is asserted low for six seconds, the unit will reset the system to the default manufacturing
settings and reboot the unit. PW2050 has an additional signal that can be used to wake up the
unit processor when the unit is in a sleep or power down state. The SHDN signal is active
when the module is in the shutdown state. Use the SHDN signal to gate off external logic
when the module is in the shutdown state to minimize power
Table 2-13 PW2050 Reset Signals
Signal Pin Description Reset
State
EXT_RESET# 77 Unit hardware reset, active low. Drive low for 50ms to
reboot unit. Signal should be driven high or left floating
after reset.
Input
DEFAULT# 66 Unit reset to default, active low.
Drive low for 5 to 6 seconds to reset unit to default
settings.
Input
WAKE 65 Toggle signal from low to high to WAKE from SLEEP or
Power down state
Input
SHDN 88 Active when module is in the shutdown state
3: PCB Footprint and Module Dimensions
The module recommended footprint is shown below. The antenna region should ideally be
placed on the edge of the board. The area under the antenna region should be void of all
signals and planes. The antenna location inside of the end unit and installation should be
chosen such that the antenna has as clear as possible line of site to the connecting WLAN
devices. The antenna path should be as clear as possible from metal, ground and power
planes from adjacent PCBs and other objects that can interfere with the signal path to the
connecting WLAN devices.
To Access CAD Files
1. Go to http://www.lantronix.com/products/cad-visio.html.
2. Click Download CAD files here to access the Registration Form.