STM32L071KB datasheet(121/136 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	136 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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121 / 136 page

DocID027101 Rev 3

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STM32L071xx

Package information

133

Device marking for WLCSP49

The following figure gives an example of topside marking versus ball A 1 position identifier

location.

Figure 52. WLCSP49 marking example (package top view)

1. Parts marked as “ES”, “E” or accompanied by an Engineering Sample notification letter, are not yet

qualified and therefore not yet ready to be used in production and any consequences deriving from such

usage will not be at ST charge. In no event, ST will be liable for any customer usage of these engineering

samples in production. ST Quality has to be contacted prior to any decision to use these Engineering

samples to run qualification activity.

Table 83. WLCSP49 recommended PCB design rules (0.4 mm pitch)

Dimension

Recommended values

Pitch

0.4

Dpad

260 µm max. (circular)

220 µm recommended

Dsm

300 µm min. (for 260 µm diameter pad)

PCB pad design

Non-solder mask defined via underbump allowed.

STM32L071KB Datasheet(PDF) 121 Page - STMicroelectronics