4 Circuit Design
Copyright © Fibocom Wireless Inc.
36
It is recommended to reserve the TVS tube position for the VBAT power
supply.
PCB design:
To reduce the equivalent impedance of the VBAT cabling, the cabling from the external
power supply to VBAT is required to be as short and wide as possible (it is recommended
that the cabling width of VBAT should be at least 1 mm/1 A to ensure sufficient power
supply capacity). The capacitors with a small capacitance should be placed close to the
module, and the ground plane of the power supply part should be as complete as
possible.
4.2
Control Interface
Control signals are used to power on/off, reset, and download the module.
4.2.1
Pulse startup
When the module is in power-off mode, pull down the PWRKEY for 100 ms to 2s to enable
the module to start. It is recommended to use OC/OD driver circuit to control the PWRKEY
pin. The following figure shows the reference circuit.
Figure 6. OC driver startup reference circuit
Another way to control the PWRKEY pin is to use a button switch. A TVS (ESD9X5VL-2/TR
recommended) should be placed near the button for ESD taken. The following figure
Содержание LC116-LA
Страница 1: ...LC116 LA Hardware Guide V1 1...
