Neoway M590 - Figure 3-6 Power-On Procedure; Figure 3-7 Power-Off Procedure

M590 GPRS Module Hardware User Guide
Copyright © Neoway Technology Co., Ltd
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Figure 3-6 Power-on procedure
Power-Off Procedure
While the module is on, drive the ON/OFF pin to ground for at least 500 ms and then release, the module
will try to detach to network and normally 2 seconds later it will shut down. Another approach to turn off the
module is using AT commands. For details, see M590 GPRS Module AT Commands. Figure 3-7 shows the
power-off procedure of the module.
Figure 3-7 Power-off procedure
Power-On/Off Control
Figure 3-8 shows a reference circuit for ON/OFF control with inverted control logic.
VBAT
ON/OFF
VDD_EXT
UART
1.2s
3s
300 ms
VBAT
ON/OFF
VDD_EXT
UART
2 s
500 ms