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SN65HVDA195-Q1 Datasheet(PDF) 3 Page - Texas Instruments |
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SN65HVDA195-Q1 Datasheet(HTML) 3 Page - Texas Instruments |
3 / 21 page SN65HVDA195-Q1 www.ti.com SLLS961A – JULY 2009 – REVISED OCTOBER 2009 Local Interconnect Network (LIN) Bus This I/O pin is the single-wire LIN bus transmitter and receiver. Transmitter Characteristics The driver is a low-side transistor with internal current limitation and thermal shutdown. There is an internal 30-k Ω pullup resistor with a serial diode structure to VSUP, so no external pullup components are required for LIN slave mode applications. An external pullup resistor of 1 k Ω, plus a series diode to VSUP must be added when the device is used for master node applications. Voltage on LIN can go from –40-V to 40-V dc without any currents other than through the pullup resistance. There are no reverse currents from the LIN bus to supply (VSUP), even in the event of a ground shift or loss of supply (VSUP). The LIN thresholds and ac parameters are LIN Protocol Specification Revision 2.0 compliant. During a thermal shut down condition, the driver is disabled. Receiver Characteristics The receiver’s characteristic thresholds are ratio-metric with the device supply pin. Typical thresholds are 50%, with a hysteresis between 5% and 17.5% of supply. The receiver is capable of receiving higher data rates (>100 kbps) than supported by LIN or SAEJ2602 specifications. This allows the SN65HVDA195 to be used for high-speed downloads at end-of-line production or other applications. The actual data rates achievable depend on system time constants (bus capacitance and pullup resistance) and driver characteristics used in the system. Transmit Input (TXD) TXD is the interface to the MCU’s LIN protocol controller or SCI/UART used to control the state of the LIN output. When TXD is low, the LIN output is dominant (near ground). When TXD is high, the LIN output is recessive (near battery). The TXD input structure is compatible with microcontrollers with 3.3-V and 5-V I/O. TXD has an internal pulldown resistor. This device does not have a TXD dominant time out protection circuit so that low data rates may be used. Receive Output (RXD) RXD is the interface to the MCU’s LIN protocol controller or SCI/UART, which reports the state of the LIN bus voltage. LIN recessive (near battery) is represented by a high level on RXD and LIN dominant (near ground) is represented by a low level on RXD. The RXD output structure is an open-drain output stage. This allows the SN65HVDA195 to be used with 3.3-V and 5-V I/O microcontrollers. If the microcontroller’s RXD pin does not have an integrated pullup, an external pullup resistor to the microcontroller I/O supply voltage is required. RXD Wake-up Request When the SN65HVDA195 has been in low-power mode and encounters a wake-up event from the LIN bus or NWake pin, RXD goes low, while the device enters and remains in standby mode (until EN is reasserted high and the device enters normal mode). Supply Voltage (VSUP) VSUP is the SN65HVDA195 device power supply pin. VSUP is connected to the battery through an external reverse battery blocking diode. The characterized operating voltage range for the SN65HVDA195 is from 7 V to 27 V. VSUP is protected for harsh automotive conditions up to 40 V. The device contains a reset circuit to avoid false bus messages during undervoltage conditions when VSUP is less than VSUP_UNDER. Ground (GND) GND is the SN65HVDA195 device ground connection. The SN65HVDA195 can operate with a ground shift as long as the ground shift does not reduce VSUP below the minimum operating voltage. If there is a loss of ground at the ECU level, the SN65HVDA195 does not have a significant current consumption on LIN bus. Copyright © 2009, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Link(s): SN65HVDA195-Q1 |
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