STM32L071KB datasheet(101/148 Pages) STMICROELECTRONICS

Part #	STM32L071KB

Description	Access line ultra-low-power 32-bit MCU Arm®-based Cortex®-M0, up to 192KB Flash, 20KB SRAM, 6KB EEPROM, ADC

PDF	148 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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101 / 148 page

DS10690 Rev 7

101/148

STM32L071xx

Electrical characteristics

112

Figure 31. Typical connection diagram using the ADC

1. Refer to Table 62: ADC characteristics for the values of RAIN, RADC and CADC.

2. Cparasitic represents the capacitance of the PCB (dependent on soldering and PCB layout quality) plus the

pad capacitance (roughly 7 pF). A high Cparasitic value will downgrade conversion accuracy. To remedy

this, fADC should be reduced.

General PCB design guidelines

Power supply decoupling should be performed as shown in Figure 32 or Figure 33,

depending on whether VREF+ is connected to VDDA or not. The 10 nF capacitors should be

ceramic (good quality). They should be placed as close as possible to the chip.

Figure 32. Power supply and reference decoupling (VREF+ not connected to VDDA)

MSv34712V1

VDDA

AINx

IL±50nA

RAIN(1)

Cparasitic

VAIN

RADC

12-bit

converter

CADC

Sample and hold ADC

converter

MS39601V1

VREF+

STM32Lxx

VDDA

VSSA / VREF–

1 μF // 100 nF

STM32L071KB Datasheet(PDF) 101 Page - STMicroelectronics