LPC11A14FBD48/301, NXP Semiconductors, LPC11A14FBD48/301, Datasheet - Page 30

• Manufacturer Part Number: LPC11A14FBD48/301,
• Description: ARM Microcontrollers - MCU CortexM0 32bit 32KB
• Manufacturer: NXP Semiconductors

Specifications of LPC11A14FBD48/301,

• Rohs: yes
• Core: ARM Cortex M0
• Processor Series: LPC11A
• Data Bus Width: 32 bit
• Maximum Clock Frequency: 50 MHz
• Program Memory Size: 32 KB
• Data Ram Size: 8 KB
• On-chip Adc: Yes
• Operating Supply Voltage: 2.6 V to 3.6 V
• Package / Case: LQFP-48
• Mounting Style: SMD/SMT
• Factory Pack Quantity: 250

NXP Semiconductors
LPC11AXX
Product data sheet
7.16 Temperature sensor
7.17 10-bit DAC
After power-up and after switching the input channels of the ADC or the comparator, the
internal voltage reference must be allowed to settle to its stable value before it can be
used as an ADC reference voltage input. Settling times are given in
For an accurate measurement of the internal voltage reference 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.
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 3 C
over the full temperature range (40 C to +85 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. See
For a voltage to temperature conversion, the temperature for a given voltage is calculated
using the parameters of the linear-least-square line (see
After power-up and after switching the input channels of the ADC or the comparator, the
temperature sensor output must be allowed to settle to its stable value before it can be
used as an accurate ADC input. Settling times are given in
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.
The DAC allows generation of a variable, rail-to-rail analog output.
•
•
When the supply voltage V
can be used to reduce the offset error E
correction then increases the accuracy of temperature sensor voltage output
measurements.
When the ADC is accurately calibrated, the internal voltage reference can be used to
measure the power supply voltage. This requires calibration by recording the ADC
code of the internal voltage reference at different power supply levels yielding a
different ADC code value for each supply voltage level. In a particular application, the
internal voltage reference can be measured and the actual power supply voltage can
be determined from the stored calibration values. The calibration values can be stored
in the EEPROM for easy access.
All information provided in this document is subject to legal disclaimers.
Rev. 4 — 30 October 2012
DD(3V3)
is known accurately, the internal voltage reference
O
of the ADC code output. The ADC error
32-bit ARM Cortex-M0 microcontroller
Table
Table
23).
Table 23
22.
LPC11Axx
Table
© NXP B.V. 2012. All rights reserved.
21.
and
Figure
30 of 84
28.