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ST7DALIF2

Electrical characteristics

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20.8

I/O port pin characteristics

20.8.1

General characteristics

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

Figure 70.

Two typical applications with unused I/O pin

Caution:

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.

Note:

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 85.

General characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VIL

Input low level voltage

VSS - 0.3

0.3xVDD

VIH

Input high level voltage

0.7xVDD

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

120

250

VDD=3 V

160

CIO

I/O pin capacitance

tf(IO)out

Output high to low level fall time (1) C

L=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 characterization results, not tested in production.

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 70). 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 (corresponding IPU current characteristics described in Figure 71).

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

UNUSED I/O PORT

ST7XXX

10k

UNUSED I/O PORT

ST7XXX

VDD

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