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MCIMX253CVM4 Datasheet(PDF) 9 Page - Freescale Semiconductor, Inc |
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MCIMX253CVM4 Datasheet(HTML) 9 Page - Freescale Semiconductor, Inc |
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9 / 132 page  i.MX25 Applications Processor for Consumer and Industrial Products, Rev. 1 Freescale Semiconductor 9 NVCC_DRYICE DryIce power supply output. Source can be SoC supply or backup supply. This pin can be used to power external components (external tamper detect, wire-mesh tamper detect). OSC_BYP The 32 kHz oscillator bypass-control pin. If this signal is pulled down, then OSC32K_EXTAL and OSC32K_XTAL analog pins should be tied to the external 32.768 kHz crystal circuit. If on the other hand the signal is pulled up, then the external 32 kHz oscillator output clock must be connected to OSC32K_EXTAL analog pin, and OSC32K_XTAL can be no connect (NC). OSC32K_EXTAL OSC32K_XTAL These analog pins are connected to an external 32 kHz CLK circuit depending on the state of OSC_BYP pin (see the description of OSC_BYP under the preceding bullet). The 32 kHz reference CLK is required for normal operation. POWER_FAIL An interrupt from PMIC, which should be connected to a low-battery detection circuit. This signal is internally connected to an on-chip 100 k Ω pull-down device. If there is no low-battery detection, then users can tie this pin to GND via a pull-down resistor, or leave the signal as NC. This pin can also be configured to work as a normal GPIO. REF External ADC reference voltage. REF may be tied to GND if the user plans to only use the internally generated 2.5 V reference supply. SJC_MOD Must be externally connected to GND for normal operation. Termination to GND through an external pull-down resistor (such as 1 k Ω) is allowed, but the value should be much smaller than the on-chip 100-k Ω pull-up. TAMPER_A, TAMPER _B DryIce external tamper detect pins, active high. If either TAMPER_A or TAMPER_B asserted, then external tampering is detected. These pins can be left unconnected if the DryIce security features are not being used. TEST_MODE For Freescale factory use only. This signal is internally connected to an on-chip pull-down device. Users must either float this signal or tie it to GND. UPLL_BYPCLK Primarily for Freescale factory use. There is no internal on-chip pull-up/down on this pin, so it must be externally connected to GND or VDD. Aside from factory use, this pin can also be configured (via muxing) to work as a normal GPIO. USBPHY1_RREF Determines the reference current for the USB PHY1 bandgap reference. An external 10 k Ω 1% resistor to GND is required. USBPHY2_DM USBPHY2_DP The output impedance of these signals is expected at 10 Ω. It is recommended to also have on-board 33 Ω series resistors (close to the pins). Table 3. Signal Considerations (continued) Signal Description |
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Similar Description - MCIMX253CVM4 |
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