C8051F960-A-GQ Silicon Labs, C8051F960-A-GQ Datasheet - Page 97
C8051F960-A-GQ
Manufacturer Part Number
C8051F960-A-GQ
Description
8-bit Microcontrollers - MCU 128KB DC-DC LCD AES
Manufacturer
Silicon Labs
Datasheet
1.C8051F960-A-GQ.pdf
(492 pages)
Specifications of C8051F960-A-GQ
Rohs
yes
Core
8051
Processor Series
C8051
Data Bus Width
8 bit
Maximum Clock Frequency
24.5 MHz
Program Memory Size
128 KB
Data Ram Size
8 KB
On-chip Adc
Yes
Operating Supply Voltage
1.8 V to 3.8 V
Operating Temperature Range
- 40 C to + 85 C
Package / Case
QFP-80
Mounting Style
SMD/SMT
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5.8. Temperature Sensor
An on-chip temperature sensor is included on the C8051F96x which can be directly accessed via the ADC
multiplexer in single-ended configuration. To use the ADC to measure the temperature sensor, the ADC
mux channel should select the temperature sensor. The temperature sensor transfer function is shown in
Figure 5.8. The output voltage (V
The TEMPE bit in register REF0CN enables/disables the temperature sensor, as described in SFR
Definition 5.15. REF0CN: Voltage Reference Control. While disabled, the temperature sensor defaults to a
high impedance state and any ADC measurements performed on the sensor will result in meaningless
data. Refer to Table 4.12 for the slope and offset parameters of the temperature sensor.
5.8.1. Calibration
The uncalibrated temperature sensor output is extremely linear and suitable for relative temperature mea-
surements (see Table 4.13 for linearity specifications). For absolute temperature measurements, offset
and/or gain calibration is recommended. Typically a 1-point (offset) calibration includes the following steps:
1. Control/measure the ambient temperature (this temperature must be known).
2. Power the device, and delay for a few seconds to allow for self-heating.
3. Perform an ADC conversion with the temperature sensor selected as the positive input and GND
4. Calculate the offset characteristics, and store this value in non-volatile memory for use with
selected as the negative input.
subsequent temperature sensor measurements.
Figure 5.8. Temperature Sensor Transfer Function
Temp
V
TEMP
TEMP
C
=
= 25 + (
) is the positive ADC input when the ADC multiplexer is set correctly.
Slope
V
x (Temp
TEMP
Rev. 0.5
Temperature
- Offset) /
C
Offset
- 25) +
( V at 25 Celsius)
Slope
Offset
Slope
( V / deg C)
C8051F96x
97
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