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L830-EB Hardware User Manual Page 20 of 39
card and some other parameters from memory, then clear the memory and PMU will be powered off. After
shutdown, the VSD2_1V8 voltage is also shut down. The software control timing is shown in Figure 3-7:
Figure 3-7 Software Shutdown Timing Control
After the software shutdown, the FULL_CARD_POWER_OFF # pin will remain high which prevents the
module from restarting again. To enable the next restart, the FULL_CARD_POWER_OFF# pin should be
pulled low after shutting down.
Note:
The VSD2_1V8 signal is the internal PMU 1.8V output voltage which is not connected to the M.2
interface. The above timing of VSD2_1V8 is only for reference.
3.3.2.2 Hardware Shutdown
By pulling down the FULL_CARD_POWER_OFF# pin for more than 50ms (100ms is recommended), the
power management unit (PMU) of the module loses its power, and then the module will shut down by the
hardware. Because the PMU will lose its power by pulling down the FULL_CARD_POWER_OFF# pin, to
avoid damaging the module with power on/off procedures, it’s necessary to pull down RESET_N pin for
≧100ms before pulling down the FULL_CARD_POWER_OFF# pin. The hardware control timing is
shown in Figure 3-8:
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