STM8L152C6T6：8位超低功耗微控制器详细规格

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"STM8L152C6T6是一款由STMicroelectronics生产的8位超低功耗微控制器，适用于需要高效能与节能特性的应用。该芯片内含最多32KB的闪存（Flash）存储空间，1KB的数据EEPROM，以及一系列外围设备，如实时时钟（RTC）、液晶显示器（LCD）、定时器、串行通信接口（包括USART、I2C和SPI）、模数转换器（ADC）、数模转换器（DAC）和比较器。该文档是产品全生产阶段的技术资料，日期为2012年11月，提供生产数据的datasheet。" STM8L152C6T6的主要特点包括： 1. **操作条件**：支持1.8V至3.6V的工作电源范围，甚至在电源关闭状态下可低至1.65V。工作温度范围涵盖-40°C到85°C，某些型号可扩展到105°C或125°C。 2. **低功耗特性**：设计有5种低功耗模式，包括Wait、Low power run、Low power wait、Active-halt with full RTC和Halt。在这些模式下，功耗极低，例如在Halt模式下仅为350nA。整体功耗在195µA/MHz的基础上加440µA，且每个I/O口的漏电流仅为50nA。从Halt模式快速唤醒只需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，性能达到16CISC MIPS每秒。具有多达40个外部中断源，提供了灵活的系统响应能力。 4. **复位和电源管理**：集成低功耗、超安全的brown-out reset（BOR），具有5个可选阈值。还包含低功耗的POR/PDR（Power-on Reset / Power-down Reset）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，以及内部16MHz的工厂校准RC振荡器和38kHz低功耗RC振荡器。这些时钟源为系统提供了多种选择和灵活性。 6. **丰富的外设**：STM8L152C6T6的外围设备丰富多样，包括RTC、LCD、多个定时器（如通用定时器、基本定时器等）、USART（通用同步异步收发传输器）用于串行通信、I2C（Inter-Integrated Circuit）接口用于短距离数字通信、SPI（Serial Peripheral Interface）用于多设备通信，以及ADC和DAC，适用于模拟信号的转换。此外，集成的比较器使得芯片可以处理模拟比较任务。这款微控制器广泛应用于需要长时间电池寿命、低功耗运行和高性能计算的小型电子设备，如物联网传感器节点、便携式设备、环境监测系统等。其强大的功能集和优化的能源效率使其在低功耗应用领域具有很高的竞争力。

Functional overview STM8L151xx, STM8L152xx

16/129 Doc ID 15962 Rev 12

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

18/129 Doc ID 15962 Rev 12

Figure 2. Medium density STM8L15x clock tree diagram

1. The HSE clock source can be either an external crystal/ceramic resonator or an external source (HSE

bypass). Refer to Section HSE clock in the STM8L15x and STM8L16x reference manual (RM0031).

2. The LSE clock source can be either an external crystal/ceramic resonator or a external source (LSE

bypass). Refer to Section LSE clock in the STM8L15x and STM8L16x reference manual (RM0031).

3.5 Low power real-time clock

The real-time clock (RTC) is an independent binary coded decimal (BCD) timer/counter.

Six byte locations contain the second, minute, hour (12/24 hour), week day, date, month,

year, in BCD (binary coded decimal) format. Correction for 28, 29 (leap year), 30, and 31

day months are made automatically.

It provides a programmable alarm and programmable periodic interrupts with wakeup from

Halt capability.

● Periodic wakeup time using the 32.768 kHz LSE with the lowest resolution (of 61 µs) is

from min. 122 µs to max. 3.9 s. With a different resolution, the wakeup time can reach

36 hours

● Periodic alarms based on the calendar can also be generated from every second to

every year

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Functional overview STM8L151xx, STM8L152xx

20/129 Doc ID 15962 Rev 12

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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