ST7FOXU0 datasheet(103/123 Pages) STMICROELECTRONICS

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ST7FOXU0

Electrical characteristics

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12.8

I/O port pin characteristics

12.8.1

General characteristics

Subject to general operating conditions for VDD, fOSC, and TA unless otherwise specified.

Figure 38.

Two typical applications with unused I/O pin

During normal operation the ICCCLK pin must be pulled-up, internally or externally (external pull-up of 10k

mandatory in noisy environment). This is to avoid entering ICC mode unexpectedly during a reset.

I/O can be left unconnected if it is configured as output (0 or 1) by the software. This has the advantage of

greater EMC robustness and lower cost.

Table 55.

General characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VIL

Input low level voltage

VSS - 0.3

0.3VDD

VIH

Input high level voltage

0.7VDD

VDD+0.3

Vhys

Schmitt trigger voltage

hysteresis(1)

400

Input leakage current

VSS ≤ VIN ≤ VDD

±1

µA

Static current consumption

induced by each floating

input pin(2)

Floating input mode

400

RPU

Weak pull-up equivalent

resistor(3)

VIN=VSS

VDD=5 V

100

120

140

Ω

CIO

I/O pin capacitance

tf(IO)out

Output high to low level fall

time(1)

CL= 50 pF

Between 10% and 90%

tr(IO)out

Output low to high level rise

time(1)

tw(IT)in

External interrupt pulse

time(4)

1tCPU

Data based on validation/design results.

Configuration not recommended, all unused pins must be kept at a fixed voltage: using the output mode of the I/O for

example or an external pull-up or pull-down resistor (see Figure 38). Static peak current value taken at a fixed VIN value,

based on design simulation and technology characteristics, not tested in production. This value depends on VDD and

temperature values.

The RPU pull-up equivalent resistor is based on a resistive transistor.

To generate an external interrupt, a minimum pulse width has to be applied on an I/O port pin configured as an external

interrupt source.

10k

Ω

UNUSED I/O PORT

ST7XXX

10k

Ω

UNUSED I/O PORT

ST7XXX

VDD

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