C8051F312 Silicon Laboratories Inc, C8051F312 Datasheet - Page 53
C8051F312
Manufacturer Part Number
C8051F312
Description
IC 8051 MCU 8K FLASH 32LQFP
Manufacturer
Silicon Laboratories Inc
Series
C8051F31xr
Specifications of C8051F312
Core Processor
8051
Core Size
8-Bit
Speed
25MHz
Connectivity
SMBus (2-Wire/I²C), SPI, UART/USART
Peripherals
POR, PWM, Temp Sensor, WDT
Number Of I /o
29
Program Memory Size
8KB (8K x 8)
Program Memory Type
FLASH
Ram Size
1.25K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 3.6 V
Data Converters
A/D 21x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
32-LQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Other names
336-1151
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Quantity:
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C8051F312
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Silicon Laboratories Inc
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The uncalibrated temperature sensor output is extremely linear and suitable for relative temperature mea-
surements (see Table 5.1 for linearity specifications). For absolute temperature measurements, gain and/
or offset calibration is recommended. Typically a 1-point calibration includes the following steps:
Figure 5.3 shows the typical temperature sensor error assuming a 1-point calibration at 25 °C. Note that
parameters which affect ADC measurement, in particular the voltage reference value, will also
affect temperature measurement.
-1.00
-2.00
-3.00
-4.00
-5.00
5.00
4.00
3.00
2.00
1.00
0.00
-40.00
Step 1. Control/measure the ambient temperature (this temperature must be known).
Step 2. Power the device, and delay for a few seconds to allow for self-heating.
Step 3. Perform an ADC conversion with the temperature sensor selected as the positive input
Step 4. Calculate the offset and/or gain characteristics, and store these values in non-volatile
Figure 5.3. Temperature Sensor Error with 1-Point Calibration
and GND selected as the negative input.
memory for use with subsequent temperature sensor measurements.
-20.00
0.00
Temperature (degrees C)
Rev. 1.7
20.00
C8051F310/1/2/3/4/5/6/7
40.00
60.00
80.00
5.00
1.00
4.00
3.00
2.00
0.00
-1.00
-2.00
-3.00
-4.00
-5.00
53
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