10.1.1 Electrical Parameters Usage

Tables in sections I/O Characteristics, Digital Peripheral Characteristics, Analog Peripheral Characteristics, Power Consumption in Active Mode and Operation and Power Consumption in Low-Power Modes define the limiting values for several electrical parameters.

Unless otherwise noted, these values are valid over the junction temperature range T_J= [-40°C; +125°C].
Parameters annotated as "simulation data" are not production-tested. Their limiting values come from simulations run in corner-case conditions and were verified by electrical characterization over a limited number of samples. Additionally, specifications in the section Digital Peripheral Characteristics are simulation data, even though they are not annotated as such.
These limits may be affected by the board on which the device is mounted. Noisy supply and ground conditions must be avoided, and care must be taken to provide:
- a PCB with a low-impedance ground plane. A single unbroken ground plane is a minimum requirement.
- low-impedance decoupling of the device power supply inputs. A 10 nF to 220 nF Ceramic X7R (or X5R) capacitor placed very close to each power supply input is a minimum requirement. See specific recommendations regarding analog pins or functions in the corresponding sections. To reduce any potential electromagnetic compatibility (EMC) related issues, it is good practice to double this decoupling capacitor whenever possible with a high frequency one, for example one 100 pF (C0G or NP0) per power supply input.
- low-impedance power supply decoupling of external components. This recommendation aims at avoiding large current spikes flowing into the PCB ground and power planes.
In addition, although the device is specified with wide operating supply ranges on most of its supply inputs (for example 1.7V to 3.6V), large and fast supply variations may lead to unpredictable device behavior including, but not limited to, out-of-specification operation. Therefore, in addition to maintaining the power supply inputs within their specified ranges, it is mandatory to keep the power supply variations within the limits shown in the following table during the device operation.

Table 10-1. Maximum Power Supply Variations⁽¹⁾
Power Input	Parameters	Conditions	Min	Max	Unit
V_N	Peak-to-peak ripple and noise voltage⁽²⁾	VDDCORE, VDDBU, VDDIOP0, VDDIOP1, VDDIOP2, VDDQSPI, VDDNF, VDDIOM	─	3	% V_DC
V_N	Peak-to-peak ripple and noise voltage⁽²⁾	VDDIN33, VDDANA, VDDLVDS⁽³⁾	─	1	% V_DC
SR	Slewrate of power supply variations⁽⁴⁾⁽⁵⁾	ΔV < 5% V_{DC_MIN}	─	±50	V/ms
		ΔV < 10% V_{DC_MIN}	─	±10	V/ms
		ΔV ≥ 10% V_{DC_MIN}	─	±1	V/ms

VDDMIPI is not mentioned in this table, as it must be connected to the VDDOUT25 regulator output that fulfills the electrical requirements of this power input.
V_DC is the power supply DC value.
The peak-to-peak ripple and noise voltage for VDDLVDS can be relaxed to 3% V_DC when this segment is not used with the LVDS PHY.
V_{DC_MIN} is the minimum operating voltage of the supply input as described in Table 10-3.
ΔV is the variation amplitude. The slewrate specification applies when ΔV ≥ V_N. The following examples and figure illustrate the above table.
- When working with VDDIOP0 = 3.3V, a maximum power supply ripple and noise voltage of 99 mV peak-to-peak (3% of 3.3V) must be maintained.
- When working with VDDIN33 = 3.3V, a maximum power supply ripple and noise voltage of 33 mV peak-to-peak (1% of 3.3V) must be maintained.

Figure 10-1. Maximum Power Supply Variation