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Embedded Modules
© Tibbo Technology Inc.
If the EM500 is to serve as a communications co-processor in a larger system that
has its own CPU (microcontroller) it is also OK to control the RST line through a
general-purpose I/O pin of this CPU. Reset pulses for the EM500 can then be
generated programmatically, by setting the I/O pin of the CPU to LOW and then to
HIGH.
The function of the MD line is described in
.
Power supply circuit
Many power supply circuits will work well. The one below is being used by Tibbo.
This circuit can handle input voltages in the 9-24V range.
Notes:
·
U1 (AP1501-33) is a popular power IC manufactured by Anachip (now Diodes
Incorporated,
·
C1 and C2 capacitors: Do not use SMD capacitors -- use regular through-hole
aluminum capacitors. This really helps reduce the noise produced by the power
supply.
·
This is an analog circuit, so layout matters. Apply reasonable "good layout" effort.
Ideally, one should use an oscilloscope to see what sort of "square wave" the
power supply generates, both at low and high input voltages, as well as light
and heavy loads. There are no recipes here -- just try and see what works for
your circuit.