参数资料
型号: MCIMX257CJM4A
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 400 MHz, MICROPROCESSOR, PBGA400
封装: 17 X 17 MM, 0.80 MM PITCH, ROHS COMPLIANT, PLASTIC, MAPBGA-400
文件页数: 16/154页
文件大小: 1498K
代理商: MCIMX257CJM4A
i.MX25 Applications Processor for Consumer and Industrial 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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MCIMX257CJM4A 制造商:Freescale Semiconductor 功能描述:IC
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