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參數(shù)資料
| 型號(hào)： | ATA8743-PXQW |
| 廠商： | Atmel |
| 文件頁(yè)數(shù)： | 165/238頁(yè) |
| 文件大小： | 3971K |
| 描述： | MCU W/TRANSMITTER ASK/FSK 24QFN |
| 產(chǎn)品培訓(xùn)模塊： | MCU Product Line Introduction |
| 標(biāo)準(zhǔn)包裝： | 6,000 |
| 頻率： | 868MHz ~ 928MHz |
| 應(yīng)用： | 家庭自動(dòng)化，遙感，RKE |
| 調(diào)制或協(xié)議： | ASK，F(xiàn)SK |
| 數(shù)據(jù)傳輸率 - 最大： | 32 kBit/s |
| 功率 - 輸出： | 3.5dBm ~ 8dBm |
| 電流 - 傳輸： | 9.3mA |
| 數(shù)據(jù)接口： | PCB，表面貼裝 |
| 天線連接器： | PCB，表面貼裝 |
| 存儲(chǔ)容量： | 4kB 閃存，256B EEPROM，256B SRAM |
| 電源電壓： | 1.8 V ~ 3.6 V |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 24-VQFN 裸露焊盤 |
| 包裝： | 帶卷 (TR) |
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165
9152BINDCO02/10
ATA8743
than the voltage of the negative pin or otherwise the voltage difference is saturated to zero. The
result is presented in one-sided form, from 0x000 (0d) through 0x3FF (+1023d). The GAIN is
either 1x or 20x.
25.8.3
Bipolar Differential Conversion
If differential channels and a bipolar input mode are used, the result is
where VPOS is the voltage on the positive input pin, VNEG the voltage on the negative input pin,
and VREF the selected voltage reference. The result is presented in twos complement form, from
0x200 (-512d) through 0x1FF (+511d). The GAIN is either 1x or 20x. Note that if the user wants
to perform a quick polarity check of the result, it is sufficient to read the MSB of the result (ADC9
in ADCH). If the bit is one, the result is negative, and if this bit is zero, the result is positive.
As default the ADC converter operates in the unipolar input mode, but the bipolar input mode
can be selected by writing the BIN bit in the ADCSRB to one. In the bipolar input mode two-sided
voltage differences are allowed and thus the voltage on the negative input pin can also be larger
than the voltage on the positive input pin.
25.9 Temperature Measurement
The temperature measurement is based on an on-chip temperature sensor that is coupled to a
single ended ADC8 channel. Selecting the ADC8 channel by writing the MUX5:0 bits in ADMUX
register to 100010 enables the temperature sensor. The internal 1.1V reference must also be
selected for the ADC reference source in the temperature sensor measurement. When the tem-
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 relation-
ship to the temperature as described in Table 51. The voltage sensitivity is approximately 1 mV /
?SPAN class="pst ATA8743-PXQW_2172479_3">C and the accuracy of the temperature measurement is +/- 10?SPAN class="pst ATA8743-PXQW_2172479_3">C after offset calibration. Band-
gap is always calibrated and its accuracy is only guaranteed between 1.0V and 1.2V
The values described in Table 25-2 on page 165 are typical values. However, due to the 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 appli-
cation software. The software calibration requires that a calibration value is measured and
stored in a register or EEPROM for each chip, as a part of the production test. The software cal-
ibration can be done utilizing the formula:
T = {[(ADCH << 8) | ADCL] - TOS} / k
where ADCn are the ADC data registers, k is a fixed coefficient and T
OS
is the temperature sen-
sor offset value determined and stored into EEPROM as a part of the production test.To obtain
best accuracy the coefficient k should be measured using two temperature calibrations. Using
offset calibration, set k = 1.0, where k = (1024*1.07mV/癈)/1.1V~1.0 [1/癈].
ADC
V
POS
V
NEG
(
) 512
?/DIV>
V
REF
------------------------------------------------------- GAIN
?/DIV>
=
Table 25-2. Temperature vs. Sensor Output Voltage (Typical Case)
Temperature / 癈
-40癈
+25癈
+85癈
+125癈
Voltage / mV
243 mV
314 mv
380 mV
424 mV
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