
28
Using the Breadboard
Resetting the Module
There are two ways to reset the module and your own external circuitry. The
CRST* signal line is available on J102 which is available to reset your
circuitry (active low).
Hardware Reset
Whenever you apply power to the system, the Agilent E2259A breadboard
module will also be reset. This pulses the CRST* line low.
Software Reset
You can also write a “1” to bit 0 of the Control Register (address 04
h
in A16
memory, refer to Chapter 3 for details). This will reset the M-Module and
pulse the CRST* line. You must write a “0” to bit 0 of the Control Register
after the reset is finished.
Using the Power Supplies
Each power supply available for use by external circuits is protected by a
positive-temperature-coefficient thermistor. When maximum current
through the thermistor is reached, it heats up, and its resistance increases
significantly thereby limiting the current; the thermistor acts like a resettable
fuse. Table 2-4 lists the power supplies, thermistor protection reference
designator (silkscreened on PC board), and the maximum current.
Table 2-4. Agilent E2259A Power Supply Protection
Thermistor Ref.
Designator
Maximum Current
Connector
Application
+5VDC Supply
F201
1000mA
J102
Main power source for all systems.
Used for supplying power to logic device.
+12VDC Supply
F200
200mA
Near J102
General purpose power for switching power
convertors, analog devices and disc drives.
-12VDC Supply
F202
200mA
Near J102
General purpose power for analog devices
and disc drives. Not recommended for power convertors.
Содержание E2259A
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