MCIMX286CVM4B Freescale Semiconductor, MCIMX286CVM4B Datasheet - Page 905

• 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

digital logic also includes most of the registers that control the analog portions of the chip.
The persistent bits within the RTC block and the power module control bits are not reset
using this method. To reset the analog as well as the digital logic, set the
HW_CLKCTRL_RESET_CHIP bit. The DC-DC converter and/or linear regulators continue
to maintain the power supply rails during the reset.
11.4 PSWITCH Pin Functions
The PSWITCH pin has several functions whose operation is determined by the i.MX28-based
product's hardware and software design.
11.4.1 Power On
When the PSWITCH pin voltage is higher than approximately the minimum MID level (as
specified in
is the primary method of starting the system through PSWITCH. All products based on the
i.MX28 must have a mechanism of bringing PSWITCH high to power up through an
always-present supply (for example, battery or VDDXTAL).
1. Consult the reference schematics for recommended PSWITCH button circuitry.
2. A MID LEVEL PSWITCH state can be generated by connecting the VDDXTAL output of the SOC to PSWITCH through a
switch.
3. PSWITCH acts like a high impedance input (>300 k ) when the voltage applied to it is less than 1.5 V. However, above 1.5
V it becomes lower impedance. To simplify design, it is recommended that a 10 k resistor to VDDIO be applied to PSWITCH
to set the HIGH LEVEL state (the PSWITCH input can tolerate voltages greater than 2.45 V as long as there is a 10 k resistor
in series to limit the current).
11.4.2 Power Down
If the PSWITCH pin voltage has a falling edge faster than 15 ns, then this sends a
power-down request to the DC-DC converter. The fast-falling-edge power-down may be
blocked by the HW_POWER_RESET_PWD_OFF function. The fast-falling edge can also
be prevented by placing a RC filter on the PSWITCH pin. Most i.MX28-based systems do
not use the PSWITCH fast-falling-edge power-down and include the RC filter to prevent
it from occurring accidentally.
Freescale Semiconductor, Inc.
PSWITCH LOW LEVEL
PSWITCH MID LEVEL & STARTUP
PSWITCH HIGH LEVEL
Table
Parameter
1
11-1) for >100 ms, the DC-DC converter begins its startup routine. This
13
i.MX28 Applications Processor Reference Manual, Rev. 1, 2010
Table 11-1. PSWITCH Input Characteristics
12
HW_PWR_STS_PSWITCH
0x00
0x01
0x11
(1.1* VDDX-
TAL)+ 0.58
0.00
0.65
Min
Max
0.30
1.50
2.45
Chapter 11 Power Supply
Uni t s
V
V
V
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