FRDMKL02ZUM
FRDM-KL02Z User Manual
Page 6 of 12
Figure 3.
Power Supply Schematic
Table 2.
FRDM-KL02Z Power Supplies
Power Supply Name
Description
P5-9V_VIN
Power supplied from the
V
IN
pin of the I/O headers
(J9 pin 8).
P5V0_USBER
Power supplied from the
OpenSDA USB
connector (J2 and J9(pin 5)).
A Schottky diode provides back drive protection.
P3V3_VREG
Regulated 3.3V supply
. Sources power to the P3V3 supply rail
through a back drive protection Schottky diode.
1
P3V3_BATT
Coin cell battery
supply voltage. Sources power to the P3V3 supply
rail through a back drive protection Schottky diode.
P3V3
Main supply rail
for the FRDM-KL02Z assembly. May be sourced from
P3V3_VREG, P3V3_BATT, or directly from the I/O headers (J9 pin 2
and pin 4)
P3V3_MCU
KL02Z MCU supply.
Header J4 provides a convenient means for
energy consumption measurements.
2
P3V3_USBER
OpenSDA circuit supply.
Header J5 provides a convenient means for
energy consumption measurements.
2
Notes:
1) By default the linear regulator, U6, is a 3.3V output regulator. However, this
is a common footprint that would allow the user to modify the assembly to
utilize an alternative device such as a 1.8V or 2.5V regulator. The KL02Z
microcontroller has an operating range of 1.71V to 3.6V.
2) J4 and J5 are not populated by default. The two pins of these headers are
shorted together by a trace on the bottom layer of the PCB. To measure the
energy consumption of either the KL02Z or the OpenSDA MCU, the trace
between these pins must first be cut. A current probe or a shunt resistor and
voltage meter can then be applied to measure the energy consumption on these
rails.
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