Datasheet

LPC82x All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet Rev. 1 — 1 October 2014 23 of 81
NXP Semiconductors
LPC82x
32-bit ARM Cortex-M0+ microcontroller
• Voltage ladder source voltage is selectable from an external pin or the main 3.3 V
supply voltage rail.
• Voltage ladder can be separately powered down for applications only requiring the
comparator function.
• Interrupt output is connected to NVIC.
• Comparator level output is connected to output pin ACMP_O.
• One comparator output is internally collected to the ADC trigger input multiplexer.
8.21 Analog-to-Digital Converter (ADC)
The ADC supports a resolution of 12 bit and fast conversion rates of up to
1.2 MSamples/s. Sequences of analog-to-digital conversions can be triggered by multiple
sources. Possible trigger sources are the pin triggers, the SCT output SCT_OUT3, the
analog comparator output, and the ARM TXEV.
The ADC includes a hardware threshold compare function with zero-crossing detection.
Remark: For best performance, select VREFP and VREFN at the same voltage levels as
V
DD
and V
SS
. When selecting VREFP and VREFN different from VDD and VSS, ensure
that the voltage midpoints are the same:
(VREFP-VREFN)/2 + VREFN = V
DD
/2
8.21.1 Features
• 12-bit successive approximation analog to digital converter.
• 12-bit conversion rate of up to 1.2 MSamples/s.
• Two configurable conversion sequences with independent triggers.
• Optional automatic high/low threshold comparison and zero-crossing detection.
• Power-down mode and low-power operating mode.
• Measurement range VREFN to VREFP (not to exceed V
DD
voltage level).
• Burst conversion mode for single or multiple inputs.
• Hardware calibration mode.