ST72411R datasheet(58/71 Pages) STMICROELECTRONICS

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ST72411R

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RECOMMENDED OPERATING CONDITIONS (Cont’d)

(Operating conditions TA = 0 to +70

°C unless otherwise specified)

Note 1: Positive injection

The IINJ+ is done through protection diodes insulated from the substrate of the die.

Note 2: For SC I/Os, VSC_PWR has to be considered.

Note 3: Negative injection

– The IINJ- is done through protection diodes NOT INSULATED from the substrate of the die. The draw-

back is a small leakage (few

µA) induced inside the die when a negative injection is performed. This leak-

age is tolerated by the digital structure, but it acts on the analog line according to the impedance versus

a leakage current of few

µA (if the MCU has an AD converter). The effect depends on the pin which is

submitted to the injection. Of course, external digital signals applied to the component must have a max-

imum impedance close to 50K

Ω.

Location of the negative current injection:

– Pure digital pins can tolerate 1.6mA. In addition, the best choice is to inject the current as far as possible

from the analog input pins.

General Note: When several inputs are submitted to a current injection, the maximum IINJ is the sum of

the positive (resp. negative) currrents (instantaneous values).

CURRENT INJECTION ON I/O PORT AND CONTROL PINS

Symbol

Parameter

Conditi ons

Min

Typ

Max

Unit

IINJ+

Total positive injected current (1)

VEXTERNAL >VDD

(Standard I/Os)

VEXTERNAL >VSC_PWR

(Smart card I/Os)

IINJ-

Total negative injected current (2)

VEXTERNAL <VSS

Digital pins

Analog pins

1.6

0.8

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