STM32L151C6U6 datasheet(86/131 Pages) STMICROELECTRONICS

Part #	STM32L151C6U6

Description	Ultra-low-power 32-bit MCU ARM-based Cortex-M3, 128KB Flash, 16KB SRAM, 4KB EEPROM, LCD, USB, ADC, DAC

PDF	131 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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86 / 131 page

Electrical characteristics

STM32L151x6/8/B, STM32L152x6/8/B

86/131

DocID17659 Rev 9

Figure 20. Recommended NRST pin protection

1. The reset network protects the device against parasitic resets.

2. The user must ensure that the level on the NRST pin can go below the VIL(NRST) max level specified in

Table 45. Otherwise the reset will not be taken into account by the device.

Table 45. NRST pin characteristics

Symbol

Parameter

Conditions

Min

Typ

Max Unit

VIL(NRST)(1)

1. Guaranteed by design, not tested in production.

NRST input low level voltage

0.8

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

1.4

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

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

ai17854

STM32Lxx

RPU

NRST(2)

VDD

Filter

Internal reset

0.1 μF

External

reset circuit(1)

STM32L151C6U6 Datasheet(PDF) 86 Page - STMicroelectronics

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