MCIMX286CVM4B Freescale Semiconductor, MCIMX286CVM4B Datasheet - Page 2262

• Manufacturer Part Number: MCIMX286CVM4B
• Description: IC MPU I.MX286 289MAPBGA
• Manufacturer: Freescale Semiconductor
• Series: i.MX28r

Specifications of MCIMX286CVM4B

• Core Processor: ARM9
• Core Size: 32-Bit
• Speed: 454MHz
• Connectivity: CAN, EBI/EMI, Ethernet, I²C, MMC, SmartCard, SPI, SSI, UART/USART, USB OTG
• Peripherals: DMA, I²S, LCD, POR, PWM, WDT
• Program Memory Size: 128KB (32K x 32)
• Program Memory Type: Mask ROM
• Ram Size: 32K x 32
• Voltage - Supply (vcc/vdd): 1.25 V ~ 5.25 V
• Data Converters: A/D 17x12b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 289-LFBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of I /o: -
• Eeprom Size: -
• Lead Free Status / Rohs Status: Compliant

LRADC Overview
The LRADC has 12 bit of resolution and an absolute accuracy of 1.3% limited primarily
by the accuracy of the bandgap voltage reference. If the bandgap voltage reference is
calibrated with the fuses, the LRADC absolute accuracy might be improved to better than
0.5%. All channels sample on the same divided clock rate from the 24.0 MHz crystal clock.
The LRADC controller includes an integrated 4-wire/5-wire touch-screen controller with
drive voltage generation for touch-screen coordinate measurement, as well as a
touch-detection interrupt circuit. The keypad (button) detect and button-detection interrupt
circuit are implemented in the controller. It contains four delay-control channels that can
be used to automatically time and schedule control events within the LRADC. The controller
also implements a threshold-detection function that can signal an interrupt when a
programmed value is crossed on a virtual LRADC channel.
2262
12
13
14
15
Channel
Number
Figure 38-1. Low-Resolution ADC and Touch-Screen Interface Block Diagram
Dedicated to measuring the voltage on the VDDA.
Dedicated to measuring the voltage on the VDDD.
Dedicated to measuring the bandgap reference voltage and can be used to calibrate out a portion of
LRADC error, and this calibration is not helpful. But if the bandgap reference is calibrated using the
fuses, then it is possible that LRADC accuracy is limited by these other sources and that using the
VBG input for calibration of the LRADC can further improve accuracy.
Dedicated to measure the voltage on the VDD5V pin and can be used to detect possible issues with 5 V rail
dropping.
the LRADC measurement error (comparator offset, buffer amp offset, and digital-to-analog converter
(DAC) offset). In most cases, the bandgap reference error (specified to ±1%) dominates the total
i.MX28 Applications Processor Reference Manual, Rev. 1, 2010
APBX Master
AHB Slave
ARM Core
XTAL/4 Clock Domain State Machines and Logic
APBX Clock Domain State Machines and Logic
Touch -Screen Controller
Temp -Sensor Controller
16-Channel LRADC
LRADC Programmable Registers
Shared DMA
AHB
Assignment
AHB-to-APBX Bridge
AHB Master
LRADC
SRAM
Freescale Semiconductor, Inc.