STM32L552CCT3PTR datasheet(143/340 Pages) STMICROELECTRONICS

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DS12737 Rev 6

143/340

STM32L552xx

Electrical characteristics

307

VREF+ - VDDA Allowed voltage difference for VREF+ > VDDA

-0.4

|∆VDDx|

Variations between different VDDX power

pins of the same domain

-50

|VSSx-VSS|

Variations between all the different ground

pins(5)

-50

1. All main power (VDD, VDDA, VDDIO2, VDDUSB, VBAT) and ground (VSS, VSSA) pins must always be

connected to the external power supply, in the permitted range.

2. VIN maximum must always be respected. Refer to Table 25: Current characteristics for the maximum

allowed injected current values.

3. This formula has to be applied only on the power supplies related to the IO structure described in the pin

definition table.

4. To sustain a voltage higher than 4 V the internal pull-up/pull-down resistors must be disabled.

5. Include VREF- pin.

Table 25. Current characteristics

Symbol

Ratings

Max

Unit

∑IVDD

Total current into sum of all VDD power lines (source)(1) (2)

1. All main power (VDD, VDDA, VDDIO2, VDDUSB, VBAT) and ground (VSS, VSSA) pins must always be

connected to the external power supplies, in the permitted range.

2. Valid also for VDD12 on SMPS package.

160

∑IVSS

Total current out of sum of all VSS ground lines (sink)(1) (2)

160

IVDD(PIN)

Maximum current into each VDD power pin (source)(1)

100

IVSS(PIN)

Maximum current out of each VSS ground pin (sink)(1)

100

IIO(PIN)

Output current sunk by any I/O and control pin except FT_f

Output current sunk by any FT_f pin

Output current sourced by any I/O and control pin

∑IIO(PIN)

Total output current sunk by sum of all I/Os and control pins(3)

3. This current consumption must be correctly distributed over all I/Os and control pins. The total output

current must not be sunk/sourced between two consecutive power supply pins referring to high pin count

QFP packages.

100

Total output current sourced by sum of all I/Os and control pins(3)

100

IINJ(PIN)(4)

4. Positive injection (when VIN > VDDIOx) is not possible on these I/Os and does not occur for input voltages

lower than the specified maximum value.

Injected current on FT_xxx, TT_xx, RST and B pins, except PA4, PA5 -5/+0(5)

5. A negative injection is induced by VIN < VSS. IINJ(PIN) must never be exceeded. Refer also to Table 24:

Voltage characteristics for the minimum allowed input voltage values.

Injected current on PA4, PA5

-5/0

∑|IINJ(PIN)| Total injected current (sum of all I/Os and control pins)(6)

6. When several inputs are submitted to a current injection, the maximum ∑|IINJ(PIN)| is the absolute sum of

the negative injected currents (instantaneous values).

+/-25

Table 24. Voltage characteristics(1) (continued)

Symbol

Ratings

Min

Max

Unit

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