Product Info

5G Module Series

RM505Q-AE Hardware Design

RM505Q-AE_Hardware_Design 26 / 79

It is recommended to use a host GPIO to control FULL_CARD_POWER_OFF# to turn on the module. A

simple reference circuit is illustrated as the following figure.

Host Module

FULL_CARD_POWER_OFF#

PMU

GPIO

1.8 V or 3.3 V

Note: The voltage of pin 6 should be no less than 1.19 V when it is at HIGH level.

100k

Figure 7: Turn on the Module with a Host GPIO

1. t

power-on

is the interval between VCC and RESET_N high voltage level. It is measured when

RESET_N is not pulled down by the host device.

2. t

turn-on

is the interval between FULL_CARD_POWER_OFF# high voltage level and RFFE_VIO_1V8

(an internal LDO output) high voltage level, which is typically 68 ms.

3. t

is the interval between VCC and FULL_CARD_POWER_OFF# high voltage level.

FULL_CARD_POWER_OFF# could be pulled up at any time decided by the host, as shown in figure

above.

4. t

booting

is the interval between RFFE_VIO_1V8 high voltage level and the USIM_VDD power-on.

3.5.2. Turn off the Module

3.5.2.1. Turn off the Module through FULL_CARD_POWER_OFF#

For the design that turns on the module with a host GPIO, when the power is supplied to VCC, pulling

down the FULL_CARD_POWER_OFF# pin will turn off the module.

The timing of turning-off scenario is illustrated in the following figure.

NOTES