STM8L15x系列8位超低功耗微控制器数据手册

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"STM8L15x系列是STMicroelectronics生产的8位超低功耗微控制器，适用于需要高效能和节能特性的应用。这款微控制器具有多种版本，包括STM8L151x4、STM8L151x6、STM8L152x4和STM8L152x6。它配备有高达32KB的Flash存储器，1KB的数据EEPROM，实时时钟(RTC)，液晶显示(LCD)控制器，多个定时器，串行通信接口如USART，I2C，SPI，模拟数字转换器(ADC)，数模转换器(DAC)以及比较器。数据手册提供了生产和使用该芯片所需的关键信息。" STM8L15x微控制器的特性包括： 1. **操作条件**：支持1.8V到3.6V的工作电源范围，甚至在电源关闭时可低至1.65V。工作温度范围分为-40°C到85°C，105°C或125°C，以适应不同的环境条件。 2. **低功耗特性**：拥有5种低功耗模式，包括等待、低功率运行（5.1µA）、低功率等待（3µA）、带RTC的活动停止模式（1.3µA）和停止模式（350nA）。总体功耗为195µA/MHz + 440µA，每个I/O口的漏电流极低，仅为50nA。快速唤醒时间从停止模式到运行只需4.7µs。 3. **先进的STM8核心**：采用哈佛架构和3级流水线，最大工作频率可达16MHz，提供16CISC MIPS每秒的性能。最多有40个外部中断源，确保了高效处理中断事件。 4. **复位和电源管理**：内置低功耗、高安全性的BOR复位，具有5个可选择的阈值。还配备了超低功耗的POR/PDR（上电复位/掉电复位）和可编程电压检测器(PVD)。 5. **时钟管理**：支持1到16MHz的晶体振荡器，32kHz晶体振荡器，16MHz的工厂校准内部RC振荡器，以及38kHz低功耗内部RC振荡器。此外，还有时钟安全功能，确保系统稳定运行。这些特性使得STM8L15x系列微控制器非常适合在电池供电设备、物联网(IoT)节点、便携式电子设备以及对功耗有严格要求的其他应用中使用。通过灵活的电源管理、高效的内核和丰富的外设接口，设计者能够构建出既经济又可靠的低功耗解决方案。

Functional overview STM8L151xx, STM8L152xx

16/131 DocID15962 Rev 13

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 (V

). The external power

supply pins must be connected as follows:

 V

SS1

; V

DD1

= 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 V

DD1

pins, the

corresponding ground pin is V

SS1

 V

SSA ;

DDA

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

analog peripherals (minimum voltage to be applied to V

DDA

is 1.8 V when the ADC1 is

used). V

DDA

and V

SSA

must be connected to V

DD1

and V

SS1

, respectively.

 V

SS2

; V

DD2

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

I/Os. V

DD2

and V

SS2

must be connected to V

DD1

and V

SS1

, respectively.

 V

REF+

; V

REF-

(for ADC1): external reference voltage for ADC1. Must be provided

externally through V

REF+

and V

REF-

pin.

 V

REF+

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

through V

REF+

3.3.2 Power supply supervisor

The device has 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 V

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 V

is below a specified threshold, V

POR/PDR

or V

BOR

, without the need

for any external reset circuit.

The device features an embedded programmable voltage detector (PVD) that monitors the

DDA

power supply and compares it to the V

PVD

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 V

DDA

drops below the V

PVD

threshold and/or when

DDA

is higher than the V

PVD

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.

3.3.3 Voltage regulator

The medium density STM8L15x embeds an internal voltage regulator for generating the 1.8

V power supply for the core and peripherals.

This regulator has two different modes:

 Main voltage regulator mode (MVR) for Run, Wait for interrupt (WFI) and Wait for event

(WFE) modes.

 Low power voltage regulator mode (LPVR) for Halt, Active-halt, Low power run and

Low power wait modes.

When entering Halt or Active-halt modes, the system automatically switches from the MVR

to the LPVR in order to reduce current consumption.

Functional overview STM8L151xx, STM8L152xx

20/131 DocID15962 Rev 13

3.10 Digital-to-analog converter (DAC)

 12-bit DAC with output buffer

 Synchronized update capability using TIM4

 DMA capability

 External triggers for conversion

 Input reference voltage V

REF+

for better resolution

Note: DAC can be served by DMA1.

3.11 Ultra-low-power comparators

The medium-density STM8L15x embeds two comparators (COMP1 and COMP2) sharing

the same current bias and voltage reference. The voltage reference can be internal or

external (coming from an I/O).

 One comparator with fixed threshold (COMP1).

 One comparator rail to rail with fast or slow mode (COMP2). The threshold can be one

of the following:

– DAC output

– External I/O

– Internal reference voltage or internal reference voltage submultiple (1/4, 1/2, 3/4)

The two comparators can be used together to offer a window function. They can wake up

from Halt mode.

3.12 System configuration controller and routing interface

The system configuration controller provides the capability to remap some alternate

functions on different I/O ports. TIM4 and ADC1 DMA channels can also be remapped.

The highly flexible routing interface allows application software to control the routing of

different I/Os to the TIM1 timer input captures. It also controls the routing of internal analog

signals to ADC1, COMP1, COMP2, DAC and the internal reference voltage V

REFINT

. It also

provides a set of registers for efficiently managing the charge transfer acquisition sequence

(Section 3.13: Touchsensing).

3.13 Touchsensing

Medium density STM8L15xxx devices provide a simple solution for adding capacitive

sensing functionality to any application. Capacitive sensing technology is able to detect

finger presence near an electrode which is protected from direct touch by a dielectric

(example, glass, plastic). The capacitive variation introduced by a finger (or any conductive

object) is measured using a proven implementation based on a surface charge transfer

acquisition principle. It consists of charging the electrode capacitance and then transferring

a part of the accumulated charges into a sampling capacitor until the voltage across this

capacitor has reached a specific threshold. In Medium density STM8L15xxx devices, the

acquisition sequence is managed by software and it involves analog I/O groups and the

routing interface.

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