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MCZ33399EFR2 Folha de dados(PDF) 11 Page - Freescale Semiconductor, Inc |
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MCZ33399EFR2 Folha de dados(HTML) 11 Page - Freescale Semiconductor, Inc |
11 / 19 page Analog Integrated Circuit Device Data Freescale Semiconductor 11 33399 FUNCTIONAL DESCRIPTION TIMING DIAGRAMS INHIBIT OUTPUT PIN (INH) The INH pin controls an external switchable voltage regulator having an inhibit input. This pin is a high-side switch structure to VSUP. When the device is in the Normal mode, the inhibit high-side switch is turned ON and the external voltage regulator is activated. When the device is in Sleep mode, the inhibit switch is turned OFF and disables the voltage regulator (if this feature is used). A wake-up event on the LIN bus line will switch the INH pin to VSUP level. Wake-up output current capability is limited to 280 µA. INH can also drive an external MOSFET connected to an MCU IRQ or XIRQ input to generate an interrupt. See the typical application illustrated in Figure 13, page 15. WAKE INPUT PIN (WAKE) The WAKE pin is a high-voltage input used to wake up the device from Sleep mode. WAKE is usually connected to an external switch in the application. The typical WAKE thresholds are VSUP/2. The WAKE pin has a special design structure and allows wake-up from both HIGH-to-LOW or LOW-to-HIGH transitions. When entering the Sleep mode, the LIN monitors the state of the WAKE pin and stores it as a reference state. The opposite state of this reference state will be the wake-up event used by the device to re-enter Normal mode. An internal filter is implemented (50 µs typical filtering time delay). The WAKE pin input structure exhibits a high impedance with extremely low input current when voltage at this pin is below 14 V. When voltage at the WAKE pin exceeds 14 V, input current starts to sink into the device. A series resistor should be inserted in order to limit the input current, mainly during transient pulses. Recommended resistor value is 33 k Ω. Important The WAKE pin should not be left open. If the wake-up function is not used, WAKE should be connected to GND to avoid false wake-up. |
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