STM8TL53X4 datasheet(14/84 Pages) STMICROELECTRONICS

14 / 84 page

Product overview

STM8TL52x4 STM8TL53x4

14/84

DocID022344 Rev 7

3.6

Low power modes

To minimize power consumption, the product features three MCU low power modes:



Wait mode: CPU clock stopped, selected peripherals at full clock speed.



Active-halt mode:

–

When wakeup time is programmed in the AWU unit, the CPU and peripheral

clocks are stopped. The RAM content is preserved.

–

When a ProxSense acquisition is ongoing, the wakeup is on ProxSense interrupts;

the CPU and the other peripheral clocks are stopped.



Halt mode: CPU and peripheral clocks are stopped, the device remains powered on.

Wakeup is triggered by an external interrupt.

The ProxSense peripheral can return to low power mode between each conversion.



The ProxSense acquisition can be operated in Run, Wait and Active-halt modes.

3.7

Voltage regulators

The STM8TL5xx4 devices embed an internal voltage regulator for generating the 1.8 V

power supply for the core and peripherals and a second internal voltage regulator providing

a stable power supply (around 1.45V) for the ProxSense peripheral.

3.7.1

Dual-mode voltage regulator

This regulator has two different modes: main voltage regulator mode (MVR) and low power

voltage regulator mode (LPVR). When in Active-halt mode, the regulator remains in MVR if

ProxSense is active. When entering Halt or Active-halt modes, the system automatically

switches from the MVR to the LPVR in order to reduce current consumption unless

ProxSense is enabled.

3.7.2

ProxSense voltage regulator

This regulator provides a very stable voltage to power the ProxSense peripheral including

ProxSense pins in order to be independent of any power supply variations. This regulator is

switched on while the ProxSense peripheral is enabled (bit PXSEN = 1) and bit

LOW_POWER is set to ‘0’ in register PXS_CR1. Otherwise, when LOW_POWER is set to

‘1’, this regulator is only enabled during conversions (while CIPF = 1 and SYNCPF = 0).

3.8

Clock control

The STM8TL5xx4 embeds a robust clock controller. It is used to distribute the system clock

(SYSCLK) to the core and the peripherals and to manage clock gating for low power modes.

This system clock is a 16-MHz High Speed Internal RC oscillator (HSI RC), followed by a

programmable prescaler.

In addition, a 38 kHz low speed internal RC oscillator is used by the Independent watchdog

(IWDG) and Auto-wakeup unit (AWU).

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