LPC5411x All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2018. All rights reserved.
Product data sheet Rev. 2.1 — 9 May 2018 44 of 105
NXP Semiconductors
LPC5411x
32-bit ARM Cortex-M4/M0+ microcontroller
7.20.6 Micro-tick timer (UTICK)
The ultra-low power Micro-tick Timer, running from the Watchdog oscillator, can be used
to wake up the device from low power modes.
7.20.6.1 Features
• Ultra simple timer.
• Write once to start.
• Interrupt or software polling.
• Four capture registers that can be triggered by external pin transitions.
7.21 12-bit Analog-to-Digital Converter (ADC)
The ADC supports a resolution of 12-bit and fast conversion rates of up to 5.0
Msamples/s. Sequences of analog-to-digital conversions can be triggered by multiple
sources. Possible trigger sources are the SCTimer/PWM, external pins, and the ARM
TXEV interrupt.
The ADC supports a variable clocking scheme with clocking synchronous to the system
clock or independent, asynchronous clocking for high-speed conversions
The ADC includes a hardware threshold compare function with zero-crossing detection.
The threshold crossing interrupt is connected internally to the SCTimer/PWM inputs for
tight timing control between the ADC and the SCTimer/PWM.
7.21.1 Features
• 12-bit successive approximation analog to digital converter.
• Input multiplexing up to 12 pins.
• Two configurable conversion sequences with independent triggers.
• Optional automatic high/low threshold comparison and “zero crossing” detection.
• Measurement range V
REFN
to V
REFP
(not to exceed V
DDA
voltage level).
• 12-bit conversion rate of 5.0 MHz. Options for reduced resolution at higher conversion
rates.
• Burst conversion mode for single or multiple inputs.
• Synchronous or asynchronous operation. Asynchronous operation maximizes
flexibility in choosing the ADC clock frequency, Synchronous mode minimizes trigger
latency and can eliminate uncertainty and jitter in response to a trigger.
• A temperature sensor is connected as an alternative input for ADC channel 0.
7.22 Temperature sensor
The temperature sensor transducer uses an intrinsic pn-junction diode reference and
outputs a Complement To Absolute Temperature (V
CTAT
) voltage. The output voltage
varies inversely with device temperature with an absolute accuracy of better than 3 C
over the full temperature range (-40 C to +105 C). The temperature sensor is only
approximately linear with a slight curvature. The output voltage is measured over different
ranges of temperatures and fit with linear-least-square lines.
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