LPC18S50 datasheet(79/151 Pages) NXP

79 / 151 page

LPC18S50_S30_S10

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Product data sheet

Rev. 1 — 23 February 2015

79 of 151

NXP Semiconductors

LPC18S50/S30/S10

32-bit ARM Cortex-M3 microcontroller

• Selectable time period from (Tcy(WDCLK)  256  4) to (Tcy(WDCLK)  224  4) in

multiples of Tcy(WDCLK)  4.

• The Watchdog Clock (WDCLK) uses the IRC as the clock source.

7.16 Analog peripherals

7.16.1 Analog-to-Digital Converter

Remark: The LPC18S50/S30/S10 contain two 10-bit ADCs.

7.16.1.1

Features

• 10-bit successive approximation analog to digital converter.

• Input multiplexing among 8 pins.

• Power-down mode.

• Measurement range 0 to VDDA.

• Sampling frequency up to 400 kSamples/s.

• Burst conversion mode for single or multiple inputs.

• Optional conversion on transition on ADCTRIG0 or ADCTRIG1 pins, combined timer

outputs 8 or 15, or the PWM output MCOA2.

• Individual result registers for each A/D channel to reduce interrupt overhead.

• DMA support.

7.16.2 Digital-to-Analog Converter (DAC)

7.16.2.1

Features

• 10-bit resolution

• Monotonic by design (resistor string architecture)

• Controllable conversion speed

• Low-power consumption

7.17 Peripherals in the RTC power domain

7.17.1 RTC

The Real-Time Clock (RTC) is a set of counters for measuring time when system power is

on, and optionally when it is off. It uses little power when the CPU does not access its

registers, especially in the reduced power modes. A separate 32 kHz oscillator clocks the

RTC. The oscillator produces a 1 Hz internal time reference and is powered by its own

power supply pin, VBAT.

7.17.1.1

Features

• Measures the passage of time to maintain a calendar and clock. Provides seconds,

minutes, hours, day of month, month, year, day of week, and day of year.

• Ultra-low power design to support battery powered systems. Uses power from the

CPU power supply when it is present.

• Dedicated battery power supply pin.

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