MCIMX253CVM4 Freescale Semiconductor, MCIMX253CVM4 Datasheet - Page 114

• Manufacturer Part Number: MCIMX253CVM4
• Description: IC MPU I.MX25 IND 400MAPBGA
• Manufacturer: Freescale Semiconductor
• Series: i.MX25r

Specifications of MCIMX253CVM4

• Core Processor: ARM9
• Core Size: 32-Bit
• Speed: 400MHz
• Connectivity: 1-Wire, EBI/EMI, Ethernet, I²C, MMC, SmartCard, SPI, SSI, UART/USART, USB OTG
• Peripherals: DMA, I²S, LCD, POR, PWM, WDT
• Number Of I /o: 128
• Program Memory Type: External Program Memory
• Ram Size: 144K x 8
• Voltage - Supply (vcc/vdd): 1.15 V ~ 1.52 V
• Data Converters: A/D 3x12b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 400-LFBGA
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Lead Free Status / Rohs Status: Compliant

Figure 83
shows the timing for ADC normal operation.
Figure 83. Timing for ADC Normal Operation
When the ADC is used so that the idle clock cycles occur between conversions (due to the negation of soc),
the selin inputs must be stable at least 1 clock cycle before the clock's rising edge where the soc signal is
latched. Also, selrefp and selrefn must be stable by the time the soc signal is latched. These conditions are
met if enadc=1 and reset=0 throughout ADC operation, including the idle cycles. If the conditions are not
met, or if power is lost during ADC operation, then a new start-up sequence is required for ADC to become
operational again.
i.MX25 Applications Processor for Consumer and Industrial Products, Rev. 8
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Freescale Semiconductor