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MCZ33399EF Datasheet(PDF) 13 Page - Freescale Semiconductor, Inc |
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MCZ33399EF Datasheet(HTML) 13 Page - Freescale Semiconductor, Inc |
13 / 19 page Analog Integrated Circuit Device Data Freescale Semiconductor 13 33399 FUNCTIONAL DEVICE OPERATION PROTECTION AND DIAGNOSIS FEATURES PROTECTION AND DIAGNOSIS FEATURES ELECTROSTATIC DISCHARGE (ESD) The 33399 has two Human Body Model ESD values. All pins can handle ±4.0 kV. The LIN bus pin, with respect to ground, can handle ±5.0 kV. ELECTROMAGNETIC COMPATIBILITY RADIATED EMISSION ON LIN BUS OUTPUT LINE Radiated emission level on the LIN bus output line is internally limited and reduced by active slew rate control of the output bus driver. Figure 11 shows the results in the frequency range 100 kHz to 2.0 MHz. ELECTROMAGNETIC IMMUNITY (EMI) On the LIN bus pin, the 33399 offers high EMI level from external disturbance occurring at the LIN bus pin in order to guarantee communication during external disturbance. On the WAKE input pin, an internal filter is implemented to reduce false wake-up during external disturbance. NOISE FILTERING Noise filtering is used to protect the electronic module against illegal wake-up spikes on the bus. Integrated receiver filters suppress any high-frequency (HF) noise induced into the bus wires. The cut-off frequency of these filters is a compromise between propagation delay and HF suppression. Figure 11. Radiated Emission in Normal Mode Table 5. Explanation of Operational and Transitional Modes State Diagram Operational/ Transitional LIN INH EN TXD RXD Sleep Mode Recessive state, driver off. 20 µA pullup current source. LOW LOW X High impedance. Awake Recessive state, driver off. HIGH LOW X LOW. Normal Mode Driver active. 30 k Ω pullup active. HIGH HIGH LOW to drive LIN bus in dominant. HIGH to drive LIN bus in recessive. Report LIN bus level: • LOW LIN bus dominant • HIGH LIN bus recessive X = Don’t care. |
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