Spu0410 Mems Microphones; Mcu Native Access Area; Mcu And Pmod Current Measurement; Figure 18. Rx Pmod Current Measurement Circuit - Renesas RX600 Series User Manual

Renesas RX Family

5.7.7 SPU0410 MEMS Microphones

The SPU0410LR5H-QB is a miniature, low power, top port microphone with an analog output. It consists of a
high-performance acoustic sensor, a low noise input buffer, and an output amplifier. For stereo, there are two
microphones fitted to the board. The outputs from the microphones are further amplified by an ISL28214 dual
operational amplifier, before being fed to the MCU.

Table 25. SPU0410 Port Assignment

Microphone RX65N MCU Port
U18 P91 (AN115)
U19 P93 (AN117)

6. MCU Native Access Area

6.1 MCU and Pmod Current Measurement

Included in the Native Pin Access area are current measurement resistors and test points to measure the
MCU USB controller current and the MCU core power current.
The CK-RX65N board has pin header test points for current measurement of the main 3.3 V MCU power and
for Pmod power. To measure current remove 0 Ohm resistor and install pin header. Alternatively use a
resistor of known value and measure the voltage drop across the resistor and use Ohm's Law to calculate
the current. J2 can be used to measure the MCU power, J1 can be used to measure Pmod 1 power, and J7
can be used to measure Pmod 2 power.
R20UT5100EG0100 Rev. 1.00
May.17.22

Figure 18. RX Pmod Current Measurement Circuit

Figure 19. RX +3.3 V Current Measurement Circuit

Figure 20. RX MCU Current Measurement

CK-RX65N v1 – User's Manual
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