External Control Pins; Rtc Power Key (Rtc_Pwr_Key); Input High/Low Voltage Of Rtc Block; Power On Sequence - Renesas DA16200 H/W User Manual

UM-WI-006
DA16200 H/W Design Guide

External Control Pins

2.7
2.7.1

RTC Power Key (RTC_PWR_KEY)

The RTC_PWR_KEY represents a power key for the RTC block. When this pin is enabled, the RTC
starts to work by following a predefined power-up sequence and eventually all the necessary power
is supplied to all the sub-blocks including the main digital block in the DA16200. When disabled, all
blocks are powered off and this mode is defined as Sleep mode 1. The DA16200 consumes
minimum leakage current in Sleep mode 1.
2.7.1.1

Input High/Low Voltage of RTC Block

The VDD of RTC blocks is VBAT, so DC parameters for RTC block is varied by VBAT. See
and Table 11 below for references.

Table 10: DC Parameters for RTC Block, 3.3 V VBAT

Parameter Symbol
Input Low Voltage V
Input High Voltage V
Note 1 RTC block: RTC_PWR_KEY, RTC_WAKE_UP, RTC_WAKE_UP2.

Table 11: DC Parameters for RTC Block, 2.1 V VBAT

Parameter Symbol
Input Low Voltage V
Input High Voltage V
Note 1 RTC block: RTC_PWR_KEY, RTC_WAKE_UP, RTC_WAKE_UP2.
When MCU controls this pin, the voltage level of control pin from MCU should be checked.
For example, when the VBAT of the DA16200 is 3.3 V and the voltage level of control signal from
MCU is 1.8 V, the RTC_PWR_KEY can't be operated normally. In this case, the RTC_PWR_KEY
can be controlled by VBAT with RC delay circuit. See
2.7.1.2

Power On Sequence

RTC_PWR_KEY should be enabled after VBAT power is supplied.
When external MCU controls this pin, some delay time is needed between VBAT power-on time and
RTC_PWR_KEY turn-on time.
When external MCU can't control this pin or MCU is not used, RC delay circuit on RTC_PWR_KEY
should be applied. See
User Manual
CFR0012
Condition
Guaranteed logic Low
IL
level
Guaranteed logic High
IH
level
Condition
Guaranteed logic Low
IL
level
Guaranteed logic High
IH
level
Figure 15 below.
Revision 1.5
23 of 44
Min Typ
VSS
2.2
Min Typ
VSS
1.6
Figure 15 below.
NDA Confidential
Table 10
Max Units
0.6 V
VBAT V
Max Units
0.3 V
VBAT V
11-Apr-2022
© 2022 Renesas Electronics