S6E2H Datasheet, PDF (72/163 Pages) Cypress Semiconductor – 32-bit ARM ® Cortex ® -M4F FM4 Microcontroller

S6E2H 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 a current consumed in device.
It can be analyzed as follows.
ICC = ICC(INT) + ΣICC(IO)
ICC(INT): Current consumed in internal logic and memory, etc. through regulator
ΣICC(IO): Sum of current (I/O switching current) consumed in output pin
For ICC (INT), it can be anticipated by (1) Current Rating in 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:
............................................................... CEXT:
..................................................................fSW:
Pin internal load capacitance
External load capacitance of output pin
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.
1. Measure current value ICC (Typ) at normal temperature (+25°C).
2. Add maximum leak current value ICC (leak_max) at operating on a value in (1).
ICC(Max) = ICC(Typ) + ICC(leak_max)
Parameter
Maximum leak current at operating
Symbol
ICC(leak_max)
Conditions
TJ = +125°C
TJ = +105°C
TJ = +85°C
Current Value
16.8 mA
8.6 mA
5.8 mA
Document Number: 001-98943 Rev *C
Page 72 of 163