Jumper Default Settings; External Power Supply; External Clock On Oscin; Reset Button - Semtech XE8000 ProStart II User Manual

8.4

JUMPER DEFAULT SETTINGS

On all the future versions of daughter boards there will be different jumper configurations. However there are
some common jumpers that will be described in the table below.
Jumper name Function
version LEDs on I/O ports
dependent
version Buttons on input port
dependent
br_consumption Used to put an ampere meter in
serial with uC VBAT
near the xtal Allows the user to put another xtal
source on xin and xout
near the connects PB4 & PB5 to the
EEPROM EEPROM
EEPROM Disconnects VBAT for the
supply EEPROM

Table 8 : Default jumpers settings

*Note that when you're using the EEPROM, you must disable the PB4 and PB5 LED's.
When you're using a battery supply, it's suggested to disable the LEDs.
8.5

EXTERNAL POWER SUPPLY

The evaluation board can be powered with a 2.4 to 5 V lithium battery.
The battery needs to be inserted in the correct way.
When connected to the motherboard the evaluation board is automatically powered by the motherboard, the battery or
external power supplies are bypassed.
The on-off button allows the user to the switch between the battery supply and the external source supply.
When the on-off button is set to external source supply, the battery is not subject to discharge.
8.6

EXTERNAL CLOCK ON OSCIN

To operate the microcontroller with an external oscillator connected to the OSCin pin, first remove the "external clock
source" jumper on the socket board. Once completed, connect the external oscillator to the header on pin "OSCIN".
8.7

RESET BUTTON

This enables users to restart the program.
When the power supply is turned off and on, the power on reset feature can be disturbed by the time of the Vreg
capacitor discharge (Vreg capacitor = 1uF).
To ensure a better start-up of the chip, it is advised to use the reset button in order to ensure the reset functionality.
© Semtech 2006
Open Closed
LEDs disabled LEDs enabled
Buttons disabled Buttons enabled
No uC VBAT VBAT connected to uC
(measurement)
User Xtal Board Xtal
Disconnected Connected
Disconnected Connected
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