Datasheet
LPC81XM All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet Rev. 4.3 — 22 April 2014 42 of 76
NXP Semiconductors
LPC81xM
32-bit ARM Cortex-M0+ microcontroller
11.3 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 T
amb
=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 30 MHz.
Table 10. Power consumption for individual analog and digital blocks
Peripheral Typical supply current in mA Notes
n/a 12 MHz 30 MHz
IRC 0.21 - - System oscillator running; PLL off; independent
of main clock frequency.
System oscillator at 12 MHz 0.28 - - IRC running; PLL off; independent of main clock
frequency.
Watchdog oscillator at
500 kHz/2
0.002 - - System oscillator running; PLL off; independent
of main clock frequency.
BOD 0.05 - - Independent of main clock frequency.
Main PLL - 0.31 - -
CLKOUT - 0.06 0.09 Main clock divided by 4 in the CLKOUTDIV
register.
ROM - 0.08 0.19 -
I2C - 0.06 0.15 -
GPIO + pin interrupt/pattern
match
- 0.09 0.23 GPIO pins configured as outputs and set to
LOW. Direction and pin state are maintained if
the GPIO is disabled in the SYSAHBCLKCFG
register.
SWM - 0.03 0.07 -
SCT - 0.17 0.42 -
WKT - 0.01 0.03 -
MRT - 0.09 0.21 -
SPI0 - 0.05 0.13 -
SPI1 - 0.06 0.14 -
CRC - 0.03 0.07 -
USART0 - 0.04 0.10 -
USART1 - 0.04 0.11 -
USART2 - 0.04 0.10 -
WWDT - 0.04 0.10 Main clock selected as clock source for the
WDT.
IOCON - 0.03 0.08 -
Comparator - 0.04 0.09 -