User's Manual l TQMa335xL UM 0101 l © 2019, TQ-Systems GmbH
Page 25
3.2.8
Power-Modes
The following modes are supported by the hardware in combination of AM335x with PMIC, RTC and supply.
3.2.8.1
RTC backup
In this mode the controller is switched off. Only the RTC is buffered by the battery. Wakeup features are not available.
Table 35:
PMIC RTC
RTC in PMIC
Remark
PMIC
Is in backup mode
BBCHEN=0
Battery charging has to be deactivated
Supply
VCC_MAIN <2.5 V; VBACKUP = 2.3 V to 3.0 V
VDDS_RTC
When supplied via LDO: Supply off
Current consumption
Approximately 20 µA
3.2.8.2
AM335x DEEP-SLEEP0-2, Standby
In this mode the following wakeup sources of the AM335x are supported.
•
GPIO0
•
Dmtimer1_1ms
•
Both USB
•
Touchscreen and ADC monitor functions
•
UART0
•
I2C0
Table 36:
AM335x DEEP-SLEEP0-2, Standby
Conditions
Remark
PMIC
•
Is in SLEEP MODE
•
Switch on voltages: (SLEEP_KEEP_LDO_ON, SLEEP_KEEP_RES_ON)
•
CLKOUT has to be activated (SLEEP_KEEP_RES:ON)
Supply
VCC_MAIN = 3.3 V
PMIC_POWER_EN
Connected with PWRHOLD
VDDS_RTC
Supplied by PMIC
3.2.8.3
AM335x Active Mode
The default mode of operation is the Active Mode.
Table 37:
AM335x Active Mode
Conditions
Remark
PMIC
Is in Active Mode
Supply
VCC_MAIN = 3.3 V
PMIC_POWER_EN
Connected with PWRHOLD
VDDS_RTC
Supplied by PMIC