LPC81XM datasheet(59/78 Pages) NXP

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LPC81XM

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Product data sheet

Rev. 4.6 — 4 April 2018

59 of 78

NXP Semiconductors

LPC81xM

32-bit ARM Cortex-M0+ microcontroller

14. Application information

14.1 Typical wake-up times

[1]

The wake-up time measured is the time between when a GPIO input pin is triggered to wake the device up

from the low power modes and from when a GPIO output pin is set in the interrupt service routine (ISR)

wake-up handler.

[2]

IRC enabled, all peripherals off.

[3]

Watchdog oscillator disabled, Brown-Out Detect (BOD) disabled.

[4]

Self wakeup-timer disabled. Wake-up from deep power-down causes the LPC800 to go through entire reset

process. The wake-up time measured is the time between when a wake-up pin is triggered to wake the

device up from the low power modes and from when a GPIO output pin is set in the reset handler.

14.2 XTAL input

The input voltage to the on-chip oscillators is limited to 1.8 V. If the oscillator is driven by a

clock in slave mode, it is recommended that the input be coupled through a capacitor with

Ci = 100 pF. To limit the input voltage to the specified range, choose an additional

capacitor to ground Cg which attenuates the input voltage by a factor Ci/(Ci + Cg). In slave

mode, a minimum of 200 mV(RMS) is needed.

In slave mode the input clock signal should be coupled by means of a capacitor of 100 pF

(Figure 36), with an amplitude between 200 mV (RMS) and 1000 mV (RMS). This

corresponds to a square wave signal with a signal swing of between 280 mV and 1.4 V.

The XTALOUT pin in this configuration can be left unconnected.

External components and models used in oscillation mode are shown in Figure 37 and in

Table 26 and Table 27. Since the feedback resistance is integrated on chip, only a crystal

and the capacitances CX1 and CX2 need to be connected externally in case of

fundamental mode oscillation (the fundamental frequency is represented by L, CL and

Table 25.

Typical wake-up times (3.3 V, Temp = 25 °C)

Power modes

VDD current

Wake-up time

Sleep mode (12 MHz)[1][2]

0.7 mA

2.6

s

Deep-sleep mode[1][3]

150

A4 s

Power-down mode[1][3]

0.9

A

s

Deep Power-down mode[4]

170 nA

215

s

Fig 36. Slave mode operation of the on-chip oscillator

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