EM773 datasheet(29/51 Pages) PHILIPS

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EM773

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Product data sheet

Rev. 2 — 3 January 2012

29 of 51

NXP Semiconductors

EM773

Energy metering IC

9.3 Peripheral power consumption

The supply current per peripheral is measured as the difference in supply current between

the peripheral block enabled and the peripheral block disabled in the SYSAHBCLKCFG

and PDRUNCFG (for analog blocks) registers. All other blocks are disabled in both

registers and no code is executed. Measured on a typical sample at Tamb =25 C. Unless

noted otherwise, the system oscillator and PLL are running in both measurements.

The supply currents are shown for system clock frequencies of 12 MHz and 48 MHz.

Table 6.

Power consumption for individual analog and digital blocks

Peripheral

Typical supply current in

Notes

n/a

12 MHz

48 MHz

IRC

0.27

System oscillator running; PLL off; independent

of main clock frequency.

System oscillator

at 12 MHz

0.22

IRC running; PLL off; independent of main clock

frequency.

Watchdog

oscillator at

500 kHz/2

0.004

System oscillator running; PLL off; independent

of main clock frequency.

BOD

0.051

Independent of main clock frequency.

Main PLL

0.21

CLKOUT

0.12

0.47

Main clock divided by 4 in the CLKOUTDIV

CT16B0

0.02

0.06

CT16B1

0.02

0.06

CT32B0

0.02

0.07

CT32B1

0.02

0.06

GPIO

0.23

0.88

GPIO pins configured as outputs and set to

LOW. Direction and pin state are maintained if

the GPIO is disabled in the SYSAHBCLKCFG

IOCONFIG

0.03

0.10

I2C

0.04

0.13

ROM

0.04

0.15

SPI0

0.12

0.45

UART

0.22

0.82

WDT

0.02

0.06

Main clock selected as clock source for the

WDT.

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