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U1
C14
Capacitance
27pF
C1
Capacitance
100nF
C3
Capacitance
100nF
C8
Capacitance
1uF
C13
Capacitance
27pF
C10
Capacitance
100nF
C25
Capacitance
100nF
C6
Capacitance
100nF
C9
Capacitance
100nF
C4
Capacitance
100nF
C2
Capacitance
100nF
C5
Capacitance
100nF
C7
Capacitance
100nF
C26
Capacitance
100nF
C11
Capacitance
1uF
R2
Resistance
27.4 Ω
SD_CLK
QSPI_SD3
LORA_NRST
QSPI_SCLK
QSPI_SS
SD_CMD
R19
Resistance
1k5 Ω
SD_DATA2
XIN
QSPI_SD0
R18
Resistance
1kΩ
R16
Resistance
50 Ω
MIC_SDA
XIN
DHT_DATA
USB_D+
SD_DATA1
QSPI_SD2
SD_DATA0
XOUT
SD_DATA3
LORA_RX
QSPI_SD1
MIC_WS
R17
Resistance
50 Ω
USB_D-
R5
Resistance
5kΩ
DHT_DATA
MIC_SCL
R1
Resistance
27.4 Ω
LORA_TX
CRYSTAL OSCILLATOR
Can connect a DHT11 or DHT22 Sensor
+1V1
+3V3
One-Wire protocol relies on the bus being pulled high by the pull-up resistor when not actively transmitting
Decoupling Capacitors
Line 1
Ensure these capacitors are placed as close as possible to the MCU power rail
Cl = 2(Ccap_load - Cstray)
VBAT
+3V3
+1V1
TEMP & HUMIDITY CIRCUIT
DECOUPLING CAPACITORS 1.1V
Line 1
Ensure these capacitors are placed as close as possible to the MCU power rail
+1V1
+3V3
+3V3
+3V3
+3V3
J6
Y1
C29
Capacitance
100nF
D2
Color
Green
J1

AvocAudio 03_01 Navigating the PCB Environment