Sensor External Sampling Capacitor; External Capacitor; Pcb Layout - Espressif Systems ESP32 Series Manual

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3.1.6 Sensor External Sampling Capacitor

The capacitors (270 pF) between SENSOR_VP and SENSOR_CAPP, SENSOR_CAPN and SENSOR_VN are used

as the sampling capacitors for the internal switch amplifier. If the two capacitors are removed, SENSOR_VP,

SENSOR_CAPP, SENSOR_CAPN and SENSOR_VN can be used as normal ADCs.

The schematics of Pin47 CAP2 and Pin48 CAP1 is shown in Figure 11. C5 (10 nF) that connects to CPA1 should

be of high precision. For the RC circuit between CAP1 and CAP2, please refer to Figure 11. Removing the RC

circuit may slightly affect ESP32 in Deep-sleep.

3.2 PCB Layout

The PCB layout design guidelines are applicable to cases when the

• ESP32 module functions as a standalone device, and when the

• ESP32 functions as a slave device.

Espressif Systems

Figure 10: ESP32 Sensor External Sampling Capacitor

Figure 11: ESP32 External Capacitor

3 SCHEMATICS AND PCB LAYOUT DESIGN

ESP32 Hardware Design Guideline V1.0

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