ST7LITEU05 datasheet(90/115 Pages) STMICROELECTRONICS

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13.8 I/O PORT PIN CHARACTERISTICS

13.8.1 General Characteristics

Subject to general operating conditions for VDD,

fOSC, and TA unless otherwise specified.

Notes:

1. Data based on characterization results, not tested in production.

2. 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 57). 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 tem-

perature values.

3. The RPU pull-up equivalent resistor is based on a resistive transistor (corresponding IPU current characteristics de-

scribed in Figure 54).

4. 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.

5. RPU not applicable on PA3 because it is multiplexed on RESET pin

Figure 52. Two typical Applications with unused I/O Pin

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VIL

Input low level voltage

-40°C to125°C

0.3xVDD

VIH

Input high level voltage

0.7 x VDD

VHYS

Schmitt trigger voltage

hysteresis 1)

400

Input leakage current

VSS≤VIN≤VDD

±1

µA

Static current consumption in-

duced by each floating input

pin2)

Floating input mode

400

RPU

Weak pull-up equivalent

resistor 3) 5)

VIN=VSS

VDD=5V

110

200

Ω

VDD=3V

2001)

CIO

I/O pin capacitance

tf(IO)out

Output high to low level fall

time 1)

CL=50pF

Between 10% and 90%

tr(IO)out

Output low to high level rise

time 1)

tw(IT)in

External interrupt pulse time 4)

1tCPU

10k

Ω

UNUSED I/O PORT

ST7XXX

10k

Ω

UNUSED I/O PORT

ST7XXX

VDD

Caution: During normal operation the ICCCLK pin must be pulled- up, internally or externally

(external pull-up of 10k mandatory in

This is to avoid entering ICC mode unexpectedly during a reset.

noisy environment).

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.

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