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AN2476 Datasheet(PDF) 6 Page - STMicroelectronics

Part # AN2476
Description  STR75x low power modes
PDF  49 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2476 Datasheet(HTML) 6 Page - STMicroelectronics

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Power supply and clocks
AN2476
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In STANDBY mode (see Section 1.8.6: STANDBY mode on page 22):
●
the Main Voltage Regulator is disabled (output VCORE is hi-Z), the kernel is powered-off
●
the Low Power Voltage Regulator powers the backup circuitry.
Figure 2.
STANDBY mode in power supply scheme 1
In STOP mode (where all clocks are disabled), it is possible to disable the Main Voltage
Regulator and to power both the backup circuitry and the kernel logic with the Low Power
Voltage Regulator (see Section 1.8.5: STOP mode on page 18)
Figure 3.
Stop mode in power supply scheme 1 when MVREG is off
MAIN
VOLTAGE
KERNEL LOGIC
BACKUP
V18_BKP
VCORE = HI-Z
(CPU &
DIGITAL &
VDD_IO
(OSC32K, RTC
REGULATOR
MEMORIES)
CIRCUITRY
WAKEUP LOGIC,
BACKUP REGISTERS)
IN STANDBY MODE THIS BLOCK IS KEPT POWERED ON
STANDBY
POWER
SWITCH
VBACKUP
MODE
OFF
~1.6V
UNPOWERED
LOW POWER
VOLTAGE
REGULATOR
VMVREG = HI-Z
V18
VLPVREG ~1.4V
MAIN
VOLTAGE
KERNEL LOGIC
BACKUP
VCORE
(CPU &
DIGITAL &
(OSC32K, RTC
REGULATOR
MEMORIES)
CIRCUITRY
WAKEUP LOGIC,
BACKUP REGISTERS)
STOP
POWER
SWITCH
VBACKUP
MODE
OFF
DISABLED (NO CLOCKS)
LOW POWER
VOLTAGE
REGULATOR
V18_BKP
VDD_IO
V18
VMVREG = HI-Z
VLPVREG



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