Input Power Select Header (J1) - Motorola M68HC11EVBU User Manual

HARDWARE PREPARATION AND INSTALLATION
2.3.1

Input Power Select Header (J1)

Use jumper header J1 to select the input power to be applied to the EVBU. The EVBU is factory-
configured and shipped with a fabricated jumper installed on pins 1 and 2 as shown below. In
this configuration, you must supply +5.0 Vdc @ 50 mA to the input power connector P1.
Fabricated
If a +5 Vdc power supply is not available, you can connect an alternate power source (+7.5 to
+14.0 Vdc) to the input power connector P1. To utilize this secondary power source, install an
MC78L05C voltage regulator at location U1 (shown below). After installing the voltage
regulator, move the fabricated jumper on pins 1 and 2 of jumper header J1 to pins 2 and 3.
2-4
1
2
3
Jumper
3
1
(TOP PCB VIEW)
J1
+5 VDC
+7.5 to +14.0 VDC
U1
MC78L05C
2
M68HC11EVBU/D