STM32L052C6 datasheet(90/136 Pages) STMICROELECTRONICS

Part #	STM32L052C6

Description	Ultra-low-power 32-bit MCU ARM-based Cortex-M0, up to 64 KB Flash memory, 8 KB SRAM, 2 KB EEPROM, USB, ADC, DAC

PDF	136 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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Electrical characteristics

STM32L052x6 STM32L052x8



90/136

DocID025936 Rev 6

Figure 26. I/O AC characteristics definition

6.3.14

NRST pin characteristics

The NRST pin input driver uses CMOS technology. It is connected to a permanent pull-up

resistor, RPU , except when it is internally driven low (see Table 62).

Unless otherwise specified, the parameters given in Table 62 are derived from tests

performed under ambient temperature and VDD supply voltage conditions summarized in

Table 25.

Table 62. NRST pin characteristics

Symbol

Parameter

Conditions

Min

Typ

Max Unit

VIL(NRST)(1)

1. Guaranteed by design.

NRST input low level voltage

VSS

-0.8

VIH(NRST)(1) NRST input high level voltage

1.4

VDD

VOL(NRST)(1)

NRST output low level

voltage

IOL = 2 mA

2.7 V < VDD < 3.6 V

0.4

IOL = 1.5 mA

1.65 V < VDD < 2.7 V

Vhys(NRST)(1)

NRST Schmitt trigger voltage

hysteresis

10%VDD(2)

2. 200 mV minimum value

-mV

RPU

Weak pull-up equivalent

resistor(3)

3. The pull-up is designed with a true resistance in series with a switchable PMOS. This PMOS contribution to

the series resistance is around 10%.

VIN VSS



VF(NRST)(1) NRST input filtered pulse

VNF(NRST)(1) NRST input not filtered pulse

350

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