C8051T630DK Silicon Laboratories Inc, C8051T630DK Datasheet - Page 45
![KIT DEV FOR C8051T630 FAMILY](/photos/9/23/92351/c8051t630dk_sml.jpg)
C8051T630DK
Manufacturer Part Number
C8051T630DK
Description
KIT DEV FOR C8051T630 FAMILY
Manufacturer
Silicon Laboratories Inc
Type
MCUr
Specifications of C8051T630DK
Contents
Board, daughter boards, power adapter, cables, documentation and software
Processor To Be Evaluated
C8051T63x
Interface Type
USB
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With/related Products
C8051T630, T631, T632, T633, T634 and T635 MCUs
For Use With
336-1465 - BOARD SOCKET DAUGHTER 20-QFN
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1464
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7. Temperature Sensor (C8051T630/2/4 only)
An on-chip temperature sensor is included on the C8051T630/2/4 which can be directly accessed via the
ADC multiplexer. To use the ADC to measure the temperature sensor, the ADC mux channel should be
configured to connect to the temperature sensor. The temperature sensor transfer function is shown in
Figure 7.1. The output voltage (V
The TEMPE bit in register REF0CN enables/disables the temperature sensor, as described in SFR Defini-
tion 9.1. While disabled, the temperature sensor defaults to a high impedance state and any ADC mea-
surements performed on the sensor will result in meaningless data. Refer to Table 5.10 for the slope and
offset parameters of the temperature sensor.
7.1. Calibration
The uncalibrated temperature sensor output is extremely linear and suitable for relative temperature mea-
surements (see Table 5.10 on page 29 for specifications). For absolute temperature measurements, offset
and/or gain calibration is recommended. A single-point offset measurement of the temperature sensor is
performed on each device during production test. The registers TOFFH and TOFFL, shown in SFR Defini-
tion 7.1 and SFR Definition 7.2 represent the output of the ADC when reading the temperature sensor at 0
degrees Celsius, and using the internal regulator as a voltage reference.
Figure 7.2 shows the typical temperature sensor error assuming a 1-point calibration at 0 °C. Parameters
that affect ADC measurement, in particular the voltage reference value, will also affect temperature
measurement.
Figure 7.1. Temperature Sensor Transfer Function
V
Temp
TEMP
TEMP
C
=
= (V
) is the positive ADC input when the ADC multiplexer is set correctly.
(Slope
TEMP
x Temp
- Offset) /
Temperature
Rev. 1.0
C
) +
Offset
Slope
Offset
C8051T630/1/2/3/4/5
(V at 0 Celsius)
Slope
(V / deg C)
45
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