Rainbow-electronics ATtiny43U Manual de usuario Pagina 126
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126
8048B–AVR–03/09
ATtiny43U
perature sensor is enabled, the ADC converter can be used in single conversion mode to
measure the voltage over the temperature sensor.
The measured voltage has a linear relationship to the temperature as described in Table 16-2
The sensitivity is approximately 1 LSB /
°C and the accuracy depends on the method of user cal-
ibration. Typically, the measurement accuracy after a single temperature calibration is ±
10°C,
assuming calibration at room temperature. Better accuracies are achieved by using two
temperature points for calibration.
The values described in Table 16-2 are typical values. However, due to process variation the
temperature sensor output voltage varies from one chip to another. To be capable of achieving
more accurate results the temperature measurement can be calibrated in the application soft-
ware. The sofware calibration can be done using the formula:
T = k * [(ADCH << 8) | ADCL] + T
OS
where ADCH and ADCL are the ADC data registers, k is the fixed slope coefficient and T
OS
is the
temperature sensor offset. Typically, k is very close to 1.0 and in single-point calibration the
coefficient may be omitted. Where higher accuracy is required the slope coefficient should be
evaluated based on measurements at two temperatures.
16.13 Register Description
16.13.1 ADMUX – ADC Multiplexer Selection Register
• Bit 7 – Res: Reserved Bit
This bit is reserved and must always be written zero.
• Bit 6 – REFS: Reference Selection Bit
This bit selects the voltage reference for the ADC, as shown in Table 16-3 on page 126. If this bit
is changed during a conversion, the change will not go in effect until this conversion is complete
(ADIF in ADCSR is set).
• Bits 5:3 – Res: Reserved Bits
These bits are reserved and will always read zero.
Table 16-2. Temperature vs. Sensor Output Voltage (Typical Case)
Temperature -40 °C+25 °C+85 °C
ADC 230 LSB 300 LSB 370 LSB
Bit 76543210
0x07 (0x27)
–
REFS
–––
MUX2 MUX1 MUX0 ADMUX
Read/Write R/W R/W R R R R/W R/W R/W
Initial Value 0 0 0 0 0 0 0 0
Table 16-3. Voltage Reference Selections for ADC
REFS Voltage Reference Selection
0V
CC
used as analog reference.
1 Internal 1.1V Voltage Reference.
- Features 1
- 4. AVR CPU Core 7
- Initial Value00000000 9
- ATtiny43U 10
- 4.6 Stack Pointer 11
- 5. Memories 15
- 6.3 System Clock Prescaler 27
- 7.1 Sleep Modes 31
- 0 1 ADC Noise Reduction 35
- 1 0 Power-down 35
- 11Reserved 35
- SM1 SM0 Sleep Mode 35
- START MODE 41
- 8.6 Component Selection 43
- 8.11 Register Description 47
- 9.2 Reset Sources 49
- 9.3 Power-on Reset 49
- 9.6 Watchdog Reset 51
- 9.8 Watchdog Timer 51
- 10. Interrupts 57
- 10.3 Register Description 59
- DATA B U S 63
- INSTRUCTIONS 65
- SYNC LATCH 65
- SYSTEM CLK 65
- 11.3 Alternate Port Functions 67
- 12.1 Features 79
- 12.2 Overview 79
- 12.5 Output Compare Unit 81
- DATA BU S 83
- (Toggle) 85
- MAX - 1 MAX BOTTOM BOTTOM + 1 89
- 13.3 Register Description 99
- 14.3 Functional Descriptions 101
- 8048B–AVR–03/09 103
- A B D EC F 105
- 14.4 Alternative USI Usage 107
- 14.5 Register Descriptions 107
- Initial Value 0 0 0 0 0 0 0 0 109
- Bit 7 6 5 4 3 2 1 0 109
- 0x0E (0x2E) 109
- 0x10 (0x30) MSB LSB USIBR 111
- Read/Write R R R R R R R R 111
- 15.2 Register Description 113
- 16.1 Features 115
- 16.2 Overview 115
- 16.7 ADC Noise Canceler 121
- Output Code 123
- 16.11 ADC Conversion Result 125
- 16.12 Temperature Measurement 125
- 17.1 Features 131
- 17.2 Overview 131
- 17.3 Physical Interface 131
- Bit 76543210 135
- Rd ––––––LB2LB1 135
- 18.9 Register Description 137
- 19. Memory Programming 139
- 19.7 Serial Programming 151
- 20.2 DC Characteristics 155
- 20.4 Clock Characteristics 157
- Gain Calibration) 161
- = 5V ± 10% 163
- 21.1 Boost Converter 165
- 22. Register Summary 167
- 23. Instruction Set Summary 169
- 24. Ordering Information 171
- 25.2 20S2 173
- 27.1 Rev. 8048B-03/09 175
- 27.2 Rev. 8048A-02/09 175
- Table of Contents 177
- Headquarters International 182
- Product Contact 182
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