MCF5253VM140J Freescale Semiconductor, MCF5253VM140J Datasheet - Page 197
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MCF5253VM140J
Manufacturer Part Number
MCF5253VM140J
Description
IC MCU 2.1MIPS 140MHZ 225MAPBGA
Manufacturer
Freescale Semiconductor
Series
MCF525xr
Datasheets
1.MCF5253VM140J.pdf
(34 pages)
2.MCF5253VM140J.pdf
(8 pages)
3.MCF5253VM140J.pdf
(648 pages)
4.MCF5253VM140J.pdf
(2 pages)
Specifications of MCF5253VM140J
Core Processor
Coldfire V2
Core Size
32-Bit
Speed
140MHz
Connectivity
CAN, EBI/EMI, I²C, QSPI, UART/USART, USB OTG
Peripherals
DMA, WDT
Program Memory Type
ROMless
Ram Size
128K x 8
Voltage - Supply (vcc/vdd)
1.08 V ~ 1.32 V
Data Converters
A/D 6x12b
Oscillator Type
External
Operating Temperature
-20°C ~ 70°C
Package / Case
225-MAPBGA
Processor Series
MCF525x
Core
ColdFire V2
3rd Party Development Tools
JLINK-CF-BDM26, EWCF
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Number Of I /o
-
Eeprom Size
-
Program Memory Size
-
Lead Free Status / Rohs Status
Details
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MCF5253VM140J
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
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the comparator will have difficulty determining if the result is negative or positive. The circuit becomes
sensitive to noise. Therefore, we recommend to set K between 20 and 50.
The ADCCLOCK should be such that the comparator can take the decision whether its output needs to be
positive or negative in time t.
When K is high it means that RC is high relative to the clock period of the ADC and the voltage step over
C per clock cycle becomes small. Therefore, the ADC becomes slow in responding to changes of the input
voltage and this affects the accuracy of the measurement.
For a correct measurement, the voltage over C should be equal to the input voltage during the entire
measurement cycle (1024 ADC clocks). Therefore for the first conversion or when switching channels,
two consecutive measurements should be made and the first one ignored. This then allows the capacitor
(C) to charge to the average value of the channel. If voltages between the channels are significantly
different, the first measurement will be inaccurate because the capacitor may not have charged to the new
level in time. When reading the same channel, it is not necessary to ignore every other measurement.
We therefore recommend to use R = 33kΩ, C = 10nF with ADCLK = BUSCLK/256. This should produce
good results for typical system clock frequencies between 30 MHz and 70 MHz.
Freescale Semiconductor
MCF5253 Reference Manual, Rev. 1
t
=
---------------------------------- -
ADCCLOCK
1
Analog to Digital Converter (ADC)
Eqn. 12-2
12-5
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