STM8AL3136 datasheet(16/124 Pages) STMICROELECTRONICS

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Functional overview

STM8AL313x/4x/6x STM8AL3L4x/6x

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DocID18474 Rev 7

3.3

Reset and supply management

3.3.1

Power supply scheme

The STM8AL313x/4x/6x and STM8AL3L4x/6x require a 1.65 V to 3.6 V operating supply

voltage (VDD). The external power supply pins must be connected as follows:

•

VSS1; VDD1 = 1.8 to 3.6 V, down to 1.65 V at power down: external power supply for

I/Os and for the internal regulator. Provided externally through VDD1 pins, the

corresponding ground pin is VSS1.

•

VSSA; VDDA = 1.8 V to 3.6 V, down to 1.65 V at power down: external power supplies for

analog peripherals (minimum voltage to be applied to VDDA is 1.8 V when the ADC1 is

used). VDDA and VSSA must be connected to VDD1 and VSS1, respectively.

•

VSS2; VDD2 = 1.8 V to 3.6 V, down to 1.65 V at power down: external power supplies for

I/Os. VDD2 and VSS2 must be connected to VDD1 and VSS1, respectively.

•

VREF+; VREF- (for ADC1): external reference voltage for ADC1. Must be provided

externally through VREF+ and VREF- pin.

•

VREF+ (for DAC): external voltage reference for DAC must be provided externally

through VREF+.

3.3.2

Power supply supervisor

The STM8AL313x/4x/6x and STM8AL3L4x/6x have an integrated ZEROPOWER power-on

reset (POR)/power-down reset (PDR), coupled with a brownout reset (BOR) circuitry. At

power-on, BOR is always active, and ensures proper operation starting from 1.8 V. After the

1.8 V BOR threshold is reached, the option byte loading process starts, either to confirm or

modify default thresholds, or to disable BOR permanently (in which case, the VDD min value

at power down is 1.65 V).

Five BOR thresholds are available through option bytes, starting from 1.8 V to 3 V. To

reduce the power consumption in Halt mode, it is possible to automatically switch off the

internal reference voltage (and consequently the BOR) in Halt mode. The device remains

under reset when VDD is below a specified threshold, VPOR/PDR or VBOR, without the need

for any external reset circuit.

The STM8AL313x/4x/6x and STM8AL3L4x/6x feature an embedded programmable voltage

detector (PVD) that monitors the VDD/VDDA power supply and compares it to the VPVD

threshold. This PVD offers 7 different levels between 1.85 V and 3.05 V, chosen by

software, with a step around 200 mV. An interrupt can be generated when VDD/VDDA drops

below the VPVD threshold and/or when VDD/VDDA is higher than the VPVD threshold. The

interrupt service routine can then generate a warning message and/or put the MCU into a

safe state. The PVD is enabled by software.

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