Freescale Semiconductor Errata (or Chip Errata) Document order number: MC33689ER Rev 2.0, 11/2005 MC33689D Introduction This errata sheet applies to the following device: • MC33689D SBCLIN (System Basis Chip with LIN Transceiver) Device Identification All standard devices are marked with a device identification and build information code. The first line written on the package indicates the Part Number and the second line the Date Code. • MC33689DDWB is the part marking for this device Device Build Information / Date Code Device markings indicate build information containing the week and year of manufacture. The date is coded with the last four characters of the seven character build information code (e.g. “AWL0529”). The date is coded as four numerical digits where the first two digits indicate the year and the last two digits indicate the week. For instance, the date code “0529” indicates the 29th week of the year 2005. Device Part Number Prefixes Some device samples are marked with a PC prefix. A PC prefix indicates a prototype device which has undergone basic testing only. After full characterization and qualification, devices will be marked with the MC prefix. MC33689D Errata - LIN Dominant Issue PC33689DDWB or MC33689DDWB are the part numbers for the device errata, regardless of the date code. Description The LIN Physical Layer Specification which is part of the LIN Specification Package 2.0 defines the VSUP supply voltage range between 7V and 18V (VBAT range 8V to 18V). On this device, the LIN bus output can get stuck in dominant state if both conditions are present: The supply voltage VSUP is below 5.5V and above 4.7V (5.5V > VSUP > 4.7V). The device is in Normal Mode and the transceiver is forcing the LIN to dominant state (TXD=0V). If VSUP drops further below 4.7V (Reset threshold typical value), the device will reset and the LIN bus goes in recessive state or if the VSUP is increasing above 5.5V the LIN bus goes also in recessive state (Normal Operation). 1. 2. Workaround Avoid stuck condition To avoid the transceiver to transmit data in the critical VSUP area (5.5V to 4.7V), the Low Voltage Interrupt of the Micro Controller can be used to detect the critical VSUP area and to disable (by software) the transmission. To reenable the transmission, the Low Voltage Flag can be used to detect that the supply voltage is back high enough. Remove a stuck condition To avoid having the stuck condition present for a longer period of time, it’s possible to detect the dominant state by monitoring the RXD signal. The stuck dominant can be removed by entering the device in Sleep or Stop Mode or by preventing the TXD communication transmission (TXD stays in Recessive State) during the VSUP critical voltage range. MC33689D Errata - Low Voltage Reset Weakness © Freescale Semiconductor, Inc., 2005. All rights reserved. PC33689DDWB or MC33689DDWB are the part numbers for device errata. The date code to consider starts the “0428” that means all devices manufactured the week 28 of the year 2004 and after are impacted by this errata. Description Sometimes, during a power up sequence, VS1/VS2 increase from 0V to nominal value and as soon as Vdd reaches 3.2V, the Reset terminal rises to 3.2V and then returns low again after few a mV. The same behavior can be observed for a power down: when Vs1/Vs2 reaches the reset threshold (4.7V typically), the Reset pin goes low and when Vdd reaches 3.2V, the Reset pin goes to 3.2V and goes low again after few a mV. Workaround Enable the microcontroller LVI (Low Voltage Inhibit). The microcontroller should be configured to work with the 3V parameters specification until 5V LVI trippoint is enabled. The behavior described above is dependent on some dynamic conditions like power up/down slew rate on Vbat line. Therefore, the following recommendations could suppress these erroneous reset pulses: 1. 2. 2 Use a filtering capacitor value on the regulator output up to 10µF Do not add external pull up resistor on the reset line Freescale Semiconductor This document contains information on a new product. Specifications and information herein are subject to change without notice. How to Reach Us: Home Page: www.freescale.com E-mail: [email protected] USA/Europe or Locations Not Listed: Freescale Semiconductor Technical Information Center, CH370 1300 N. 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