參數(shù)資料
型號: MCIMX255AJM4
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 400 MHz, MICROPROCESSOR, PBGA400
封裝: 17 X 17 MM, 0.80 MM PITCH, ROHS COMPLIANT, PLASTIC, MAPBGA-400
文件頁數(shù): 16/140頁
文件大?。?/td> 1416K
代理商: MCIMX255AJM4
i.MX25 Applications Processor for Automotive Products, Rev. 8
112
Freescale Semiconductor
3.7.18.2
ADC Timing Diagrams
Figure 82 represents the synchronization between the signals clk, soc, eoc, and the output bits in the usage
of the internal ADC. After a conversion cycle eoc is asserted, a new conversion begins only when the
Power Supply Requirements
Current consumption2
NVCC_ADC
QVDD
——
2.1
0.5
mA
Power-down current
NVCC_ADC
QVDD
——
1
10
uA
Touchscreen Interface
Expected plate resistance
100
1500
Ω
Switch drivers on
resistance
GND and VDD switches
10
Ω
Conversion Characteristics3
DNL4
fin = 1 kHz
+/–0.75
LSB
INL4
fin = 1 kHz
+/–2.0
LSB
Gain + Offset Error
+/–2
%FS
1 This comprises only the required initial dummy conversion cycle. Additional power-up time depends on the enadc, reset and
soc
signals applied to the touchscreen controller.
2 This value only includes the ADC and the driver switches, but it does not take into account the current consumption in the
touchscreen plate. For example, if the plate resistance is 100 W, the total current consumption is about 33 mA.
3 At avdd = 3.3 V, dvdd = 1.2 V, Tjunction = 50 °C, fclk = 1.75 MHz, any process corner, unless otherwise noted.
4 Value measured with a –0.5 dBFS sinusoidal input signal and computed with the code density test.
Table 85. Touchscreen ADC Electrical Specifications (continued)
Parameter
Conditions
Min.
Typ.
Max.
Unit
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