AN3316 datasheet(39/42 Pages) STMICROELECTRONICS

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AN3316

Consumption tables

Doc ID 18232 Rev 2

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3.4

Consumption example

So, to calculate the peripheral consumption refer to the following scenario:

●

Fperiph = PLL at 32 MHz

●

Fcan = XTAL at 8 MHz (to avoid PLL glitches)

Each peripheral is showed in the following table:

Table 15.

Peripherals consumption table

Symbol

Parameter

Conditions

Value

Unit

Type

IDD_BV(CAN)

CC T

CAN

(FlexCAN)

supply current

on VDD_BV

500 Kbps Total (static + dynamic)

consumption:

– FlexCAN in loop-back mode

– XTAL at 8 MHz used as CAN

engine clocksource

– Message sending period is 580s

8 * fperiph + 85

A

125Kbps

8 * fperiph + 27

IDD_BV(eMIOS) CC T

eMIOS supply

current on

VDD_BV

Static consumption:

– eMIOS channel OFF

– Global prescaler enabled

29 * fperiph

Dynamic consumption:

– It does not change by varying the frequency

(0.003 mA)

IDD_BV(SCI)

CC T

SCI(LINFlex)

supply current

on VDD_BV

Total (static + dynamic) consumption:

– LIN mode

– Baudrate: 20 Kbps

5 * fperiph + 31

IDD_BV(SPI)

CC T

SPI(DSPI)

supply current

on VDD_BV

Ballast static condition (only clocked)

Ballast dynamic condition (continuous

communication):

– Baudrate: 2 Mbit

– Transimmisio every 8 s

– Frame: 16 bits

16 * fperiph

IDD_BV(ADC)

CC T

ADC supply

current on

VDD_BV

VDD = 5.5V

Ballast static consumption (no

conservation)

41 * fperiph

µA

VDD = 5.5V

Ballast dynamic consumption

(continuous conservation)

5 * fperiph

IDD_HV_ADC(ADC) CC T

ADC supply

current on

VDD_HV_ADC

VDD = 5.5V

Analog static consumption (no

conservation)

2 * fperiph

VDD = 5.5V

Analog dynamic consumption

(continuous conservation)

75 * fperiph + 32

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