C8051F350-TB Silicon Laboratories Inc, C8051F350-TB Datasheet - Page 77
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C8051F350-TB
Manufacturer Part Number
C8051F350-TB
Description
PROTOTYPINGBOARDWITH C8051F350
Manufacturer
Silicon Laboratories Inc
Type
MCUr
Specifications of C8051F350-TB
Contents
Board
Processor To Be Evaluated
C8051F35x
Interface Type
USB
Silicon Manufacturer
Silicon Labs
Core Architecture
8051
Silicon Core Number
C8051F350
Silicon Family Name
C8051F35x
Kit Contents
Board
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
C8051F350
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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8.
The temperature sensor system consists of two diodes with different temperature properties and two con-
stant current sources. The two channels are connected to the ADC inputs internally, using the ADC’s ana-
log multiplexer. The temperature sensor system can be used in single-ended or differential mode to
measure the temperature of the C8051F350/1/2/3. Single channel measurements produce more output
voltage per degree C, but are not as linear as differential measurements. See Table 8.1 for temperature
sensor electrical characteristics.
The temperature sensor channels are automatically enabled when they are selected by the ADC multi-
plexer. To use the temperature sensor for a single-channel measurement, the ADC multiplexer should be
configured with one channel connected to the temperature sensor, and the other connected to AGND. For
a differential measurement, the temperature sensor should be selected for both ADC channels.
The transfer functions for single-channel and differential measurements are shown in Figure 8.2 and
Figure 8.3, respectively. For slope and offset values, refer to Table 8.1.
Table 8.1. Temperature Sensor Electrical Characteristics
V
Linearity
Offset
Offset Error*
Slope
Slope Error*
AV+ Supply Current
*Note: Represents one standard deviation from the mean.
DD
= 3.0 V; –40 to +85 °C unless otherwise specified.
Temperature Sensor
Parameter
Figure 8.1. Temperature Sensor Block Diagram
AIN+ Channel Measurement, Temp = 0 °C
Differential Measurement, Temp = 0 °C
Channel
AIN+
Single Channel Measurement
Single Channel Measurement
AIN+ Channel Measurement
Differential Measurement
Differential Measurement
Differential Measurement
AGND
Conditions
AV+
Rev. 1.1
Channel
AIN-
To AIN+ Mux
To AIN- Mux
C8051F350/1/2/3
Min
—
—
—
—
—
—
±0.01
–1.73
±0.4
54.3
±6.6
Typ
757
205
±1
10
20
Max
—
—
—
—
—
—
mV/°C
uV/°C
µV/°C
Units
mV
mV
mV
µA
µA
°C
°C
77
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