STM8L151X6 datasheet(17/147 Pages) STMICROELECTRONICS

17 / 147 page

DS6948 Rev 11

17/147

STM8L151x6/8 STM8L152x6/8

Functional overview

3.3

Reset and supply management

3.3.1

Power supply scheme

The device requires a 1.65 V to 3.6 V operating supply voltage (VDD). The external power

supply pins must be connected as follows:

•

VSS1, VDD1, VSS2, VDD2, VSS3, VDD3, VSS4, VDD4= 1.65 to 3.6 V: external power supply

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

corresponding ground pin is VSS. VSS1/VSS2/VSS3/VSS4 and VDD1/VDD2/VDD3/VDD4

must not be left unconnected.

•

VSSA, VDDA = 1.65 to 3.6 V: 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 VDD and VSS, respectively.

•

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

externally through VREF+ and VREF- pin.

•

VREF+ (for DAC1/2): external voltage reference for DAC1 and DAC2 must be provided

externally through VREF+.

3.3.2

Power supply supervisor

The device has an integrated ZEROPOWER power-on reset (POR)/power-down reset

(PDR). For the device sales types without the “D” option (see Section 11: Ordering

information), it is coupled with a brownout reset (BOR) circuitry. It that case the device

operates between 1.8 and 3.6 V, 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 in

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

any external reset circuit.

Note:

For device sales types with the “D” option (see Section 11: Ordering information) BOR is

permanently disabled and the device operates between 1.65 and 3.6 V. In this case it is not

possible to enable BOR through the option bytes.

The device features 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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