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MAX13020 Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX13020 Datasheet(HTML) 10 Page - Maxim Integrated Products |
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10 / 16 page  MAX13020/MAX13021 ±60V Fault-Protected LIN Transceivers 10 Maxim Integrated Sleep Mode Sleep mode is the lowest power operating mode and is the default state after power is applied to BAT. In sleep mode, the MAX13020/MAX13021 disable the LIN trans- mitter and receiver to reduce power consumption. RXD and INH are high impedance. The internal slave termi- nation resistor between LIN and BAT is disabled, and only a weak pullup from LIN to BAT is enabled. While in sleep mode, the MAX13020/MAX13021 transition to standby mode when a local or remote wake-up event is detected. For applications with a continuously powered microprocessor, drive NSLP logic-high for longer than tGOTONORM to force the MAX13020/MAX13021 directly into normal slope mode if TXD is logic-high, and low slope mode if TXD is logic-low. From normal slope or low slope mode, drive NSLP logic-low for longer than tGOTOSLEEP to force the MAX13020/MAX13021 into sleep mode. Standby Mode In standby mode, the LIN transmitter and receiver are disabled, the internal slave termination resistor between LIN and BAT is enabled, and the INH output is pulled high. The MAX13020/MAX13021 transition to standby mode from sleep mode when a wake-up event is detected. From standby mode, drive TXD logic-high or logic-low, then drive NSLP logic-high for longer than tGOTONORM to transition to normal slope or low slope mode. In standby mode, RXD is driven logic-low to transmit the wake-up interrupt flag to a microcontroller. The wake-up source flag is presented on TXD as a strong pulldown in the case of a local wake-up. In the case of a remote wake-up, TXD is pulled low by the internal 330k Ω resistor only. The wake-up interrupt and wake-up source flag are cleared when the MAX13020/MAX13021 transition to normal slope mode or low slope mode. Normal Slope Mode In normal slope mode, the MAX13020/MAX13021 pro- vide the physical layer interface to a LIN bus through RXD and TXD. INH is pulled high and the internal slave termination resistance from LIN to BAT is enabled. Data presented on TXD is transmitted on the LIN bus with a controlled slew rate to limit EME. Drive TXD logic-low to assert a dominant state on LIN. The LIN bus state is presented on the open-drain output RXD. A dominant LIN state produces a logic-low on RXD. From standby or sleep mode, drive TXD logic-high, then drive NSLP logic-high for longer than tGOTONORM to enter normal slope mode. Drive NSLP logic-low for longer than tGOTOSLEEP to force the device into sleep mode from normal slope mode. NORMAL SLOPE MODE FAULT MODE LOW SLOPE MODE SLEEP MODE t(NSLP = 1 AFTER 0 TO 1) > tGOTONORM TXD = 1 t(LIN = DOMINANT) > tLIN(DOM)(DET) t(NSLP = 0 AFTER 1 TO 0) > tGOTOSLEEP t(NSLP = 0 AFTER 1 TO 0) > tGOTOSLEEP t(NSLP = 1 AFTER 0 TO 1) > tGOTONORM TXD = 0 INITIAL POWER-ON STATE STANDBY MODE t(NSLP = 1 AFTER 0 TO 1) > tGOTONORM TXD = 1 t(NSLP = 1 AFTER 0 TO 1) > tGOTONORM TXD = 0 (tNWAKE = 0 AFTER 1 TO 0) > tNWAKE OR t(LIN = 0 AFTER 1 TO 0) >tBUS t(LIN = RECESSIVE) > tLIN(DOM)(REC) DISABLE MODE t(NWAKE = 0 AFTER 1 TO 0) > tNWAKE t(NSLP = 0 AFTER 1 TO 0) > tGOTOSLEEP t(NSLP = 1 AFTER 0 TO 1) > tGOTONORM t(LIN = DOMINANT) > tLIN(DOM)(DET) t(LIN = RECESSIVE) > tLIN(DOM)(REC) Figure 2. MAX13021 Operating Modes |
Similar Part No. - MAX13020_12 |
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Similar Description - MAX13020_12 |
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