S6E2C2 Datasheet, PDF (99/207 Pages) Cypress Semiconductor – 32-bit ARM® Cortex®-M4F FM4 Microcontroller

S6E2C2 Series
Calculation Method of Power Dissipation (Pd)
The power dissipation is shown in the following formula.
Pd = VCC × ICC + Σ (IOL × VOL) + Σ ((VCC-VOH) × (-IOH))
IOL: L level output current
IOH: H level output current
VOL: L level output voltage
VOH: H level output voltage
ICC is the current drawn by the device.
It can be analyzed as follows.
ICC = ICC (INT) + ΣICC (IO)
ICC (INT): Current drawn by internal logic and memory, etc. through the regulator
ΣICC (IO): Sum of current (I/O switching current) drawn by the output pin
For ICC (INT), it can be anticipated by (1) Current Rating in 12.3. DC Characteristics (This rating value does not include ICC (IO) for a
value at pin fixed).
For ICC (IO), it depends on system used by customers.
The calculation formula is shown below.
ICC (IO) =
(CINT + CEXT) × VCC × fSW
CINT: Pin internal load capacitance
CEXT: External load capacitance of output pin
fSW: Pin switching frequency
Parameter
Pin internal load
capacitance
Symbol
CINT
Conditions
4 mA type
8 mA type
12 mA type
Capacitance Value
1.93 pF
3.45 pF
3.42 pF
Calculate ICC (Max) as follows when the power dissipation can be evaluated by yourself:
Measure current value ICC (Typ) at normal temperature (+25°C).
Add maximum leakage current value ICC (leak_max) at operating on a value in (1).
ICC(Max) = ICC (Typ) + ICC (leak_max)
Parameter
Maximum leakage
current at operating
Symbol
ICC (leak_max)
Conditions
TJ = +125°C
TJ = +105°C
TJ = +85°C
Current Value
79.2 mA
39.4 mA
26.5 mA
Document Number: 002-05030 Rev.*A
Page 99 of 207