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UM-WI-006
DA16200 H/W Design Guide
The recommended C value is 470 nF or 1 uF (not to exceed 1 uF) and R value should have enough
delay between VBAT power-on time and RTC_PWR_KEY turn-on time. For example, R and C value
will be 82 kΩ and 1 uF when the VBAT power-on time is 10 msec.
See section 6. Power Management of [1]for more details and check it carefully.
2.7.2
RTC Wakeup Key (RTC_WAKE_UP and RTC_WAKE_UP2)
This pin is an input pin for receiving an external event signal from an external device like a sensor.
The RTC block detects an external event signal via this pin and wakes up the DA16200 from Sleep
mode 2 or Sleep mode 3.
2.7.2.1
Input High/Low Voltage of RTC Block
RTC_WAKE_UP1/2 are also RTC block, so the input high/low voltage of RTC_WAKE_UP1/2 is
varied by VBAT same as RTC_PWR_KEY. See
check the voltage level of external device.
2.7.2.2
Pull-Down Resistor
4.7 kΩ pull-down resistor on RTC_WAKE_UP and RTC_WAKE_UP2 pins to avoid the leakage
current. In fact, both pull-up and pull-down are available, but pull-down is better for layout.
When this pin is not used, it can be connected to GND directly without pull-down resistor. See
Figure
16.
2.7.2.3
GPIO Wakeup Pin
The normal GPIO of the DA16200 can support wakeup function when RTC_WAKE_UP1/2 can't be
used as the voltage level are different. See section 7.4.1 Wake-up Controller of
User Manual
CFR0012
Figure 15: RTC_PWR_KEY Circuit
Table 10
Figure 16: RTC_WAKE_UP Circuit
Revision 1.5
24 of 44
and
Table 11
for references and carefully
[1]
© 2022 Renesas Electronics
NDA Confidential
for details.
11-Apr-2022
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