Datasheet

DA16200MOD
Ultra Low Power Wi-Fi Module
Datasheet
Revision 3.1
03-Feb-2021
CFR0011-120-00
20 of 60
© 2021 Dialog Semiconductor
6 Power Management
DA16200MOD has an RTC block which provides power management and function control for low
power operation. In normal operation, the RTC block is always powered on when RTC_PWR_KEY is
enabled.
6.1 Power On Sequence
The sequence after the initial switching from power-off to power-on is shown in Figure 7.
The RTC_PWR_KEY of DA16200 is a pin that enables the RTC block. Once RTC_PWR_KEY is
enabled after VBAT power is supplied, all the internal regulators are switched on automatically in the
sequence pre-defined by the RTC block.
Once RTC_PWR_KEY is switched on, LDOs for both XTAL and digital I/O are switched on shortly
and then the DC-DC regulator is switched on according to the pre-defined interval. The enabling
intervals can also be modified in the register settings after initial power-up.
CLK_32K
VBAT
POWER_KEY
T2
T3
IO Voltage
T1
50% VBAT
50% IO
T0
50% VBAT
Figure 7: Power on Sequence
Table 16: Power on Sequence Timing Requirements
Name
Description
Min
Typ
Max
Unit
T0
VBAT power-on time from 10 % to 90% of VBAT
ms
T1
IO voltage and VCC supply
0
ms
T2
RTC_PWR_KEY switch-on time from 50 % VBAT to 50 %
POWER_KEY * Note 1
5*T0
ms
T3
Internal RC oscillator wake-up time
217
µs
Note 1 If the T0 = 10 ms to switch on VBAT, the recommended T2 is 50 ms for the safe booting operation. It
would be externally controlled by MCU or it would be implemented using RC filter at the input of
RTC_PWR_KEY. The recommended C is 470 nF or 1uF (not to exceed 1 uF) and R value is chosen
to have T2 delay. For example, R and C values will be 82 kΩ and 1 uF when T0 = 10 ms.
6.2 Low Power Operation Mode
DA16200MOD provides three Sleep modes as low power operation modes.
6.2.1 Sleep Mode 1
Sleep mode 1 is an operational mode in which the RTC_PWR_KEY is not switched to high yet. The
RTC_PWR_KEY is in the low state and the DA16200MOD is only supplied with VBAT power. With all
the internal blocks off in Sleep mode 1, only the leakage current from a minimal number of internal
blocks connected to VBAT remains.