STM32L021D4 datasheet(112/114 Pages) STMICROELECTRONICS

112 / 114 page

Revision history

STM32L021x4

112/114

DocID027982 Rev 5

20-Jun-2016

Updated:

– Features in cover page: Stop mode values, number of

DMA channels, number of I/Os, number of

communication peripherals.

– Table 26: Current consumption in Low-power Run

mode, Table 27: Current consumption in Low-power

Sleep mode, Table 33: Low-power mode wakeup

timings, Table 35: Low-speed external user clock

characteristics

12-Sep-2017

Removed I/O operation from Table 2: Functionalities

depending on the operating power supply range.

Updated Section 3.4.4: Boot modes and added Note 7.

in Table 12: Pin definitions.

Changed USARTx_RTS and LPUARTx_RTS into

USARTx_RTS_DE and LPUARTx_RTS_DE,

respectively in Section 4: Pin descriptions.

In Section 5: Memory mapping, replaced memory

mapping schematic by reference to the reference

manual.

Updated introduction text in Section 6.2: Absolute

maximum ratings to mention device mission profile and

extended mission profiles.

Added note in Table 48: I/O current injection

susceptibility.

Updated minimum and maximum values of I/O weak

pull-up equivalent resistor (RPU) and weak pull-down

equivalent resistor (RPD) in Table 49: I/O static

characteristics.

Updated minimum and maximum values of NRST weak

pull-up equivalent resistor (RPU) in Table 52: NRST pin

characteristics. Added note 2 related to the position of

the external capacitor below Figure 25: Recommended

NRST pin protection.

Updated Section : I2C interface characteristics.

Removed section USART/LPUART characteristics.

Updated Figure 28: SPI timing diagram - slave mode

and CPHA = 0, Figure 29: SPI timing diagram - slave

mode and CPHA = 1(1) and Figure 30: SPI timing

diagram - master mode(1).

Table 75. Document revision history

Date

Revision

Changes

STM32L021D4 Datasheet(PDF) 112 Page - STMicroelectronics

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