Quectel FCM561D-P Hardware Design page 38

Wi-Fi&Bluetooth Module Series
CHIP_EN
4.7 kΩ
Control
Q1
R1
47 kΩ
R2
Figure 8: Reference Circuit of CHIP_EN by Using A Driving Circuit
Another way to control the CHIP_EN is by using a button directly. When pressing the button, an
electrostatic strike may generate from finger. Therefore, a TVS component shall be placed near the
button for ESD protection.
Figure 9: Reference Circuit of RESET with A Button
The module reset timing is illustrated in the following figure.
VBAT
T ≥ 1 ms
≥ 2.4 V
V
CHIP_EN
IH
≤ 0.3 V
V
IL
Figure 10: Reset Timing
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