Datasheet

LPC11E6X All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet Rev. 1.2 — 21 May 2014 33 of 89
NXP Semiconductors
LPC11E6x
32-bit ARM Cortex-M0+ microcontroller
• Optional automatic high/low threshold comparison and zero-crossing detection.
• Power-down mode and low-power operating mode.
• Measurement range VREFN to VREFP (typically 3 V; not to exceed V
DDA
voltage
level).
• Burst conversion mode for single or multiple inputs.
8.23 Temperature sensor
The temperature sensor transducer uses an intrinsic pn-junction diode reference and
outputs a CTAT voltage (Complement To Absolute Temperature). The output voltage
varies inversely with device temperature with an absolute accuracy of better than ±5 C
over the full temperature range (40 C to +105 C) for typical samples. The temperature
sensor is approximately linear with a slight curvature. The output voltage is measured
over different ranges of temperatures and fit with linear-least-square lines.
After power-up and after switching the input channels of the ADC, the temperature sensor
output must be allowed to settle to its stable value before it can be used as an accurate
ADC input.
For an accurate measurement of the temperature sensor by the ADC, the ADC must be
configured in single-channel burst mode. The last value of a nine-conversion (or more)
burst provides an accurate result.