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TPIC1021DR 데이터시트(PDF) 2 Page - Texas Instruments |
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TPIC1021DR 데이터시트(HTML) 2 Page - Texas Instruments |
2 / 18 page www.ti.com TERMINAL FUNCTIONS LIN Bus Pin Transmit Input Pin (TXD) Receive Output Pin (RXD) TPIC1021 LIN Physical Interface SLIS113C – OCTOBER 2004 – REVISED JULY 2005 Terminal Assignments PIN NAME PIN NO. PIN TYPE DESCRIPTION RXD 1 O RXD output (open drain) pin interface reporting state of LIN bus voltage EN 2 I Enable input pin NWake 3 I High voltage input pin for device wake up TXD 4 I TXD input pin interface to control state of LIN output GND 5 I Ground connection LIN 6 I/O LIN bus pin single wire transmitter and receiver VSUP 7 Supply Device supply pin (connected to battery in series with external reverse blocking diode) INH 8 O Inhibit pin controls external voltage regulator with inhibit input 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 pull-up resistor with a serial diode structure to V sup so no external pull-up components are required for LIN slave mode applications. An external pull-up resistor of 1 k Ω plus a series diode to V sup must be added when the device is used for master node applications. Voltage on the LIN pin can go from -40 V to +40 V DC without any currents other than through the pull-up 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 compatible LIN Protocol Specification Revision 2.0. 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. This pin 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, LIN output is dominant (near ground). When TXD is high, LIN output is recessive (near battery). TXD input structure is compatible with microcontrollers with 3.3 V and 5.0 V I/O. This pin has an internal pull-down resistor. TXD Dominant State Timeout If the TXD pin is inadvertently driven permanently low by a hardware or software application failure, the LIN bus is protected by TPIC1021’s Dominant State Timeout Timer. This timer is triggered by a falling edge on the TXD pin. If the low signal remains on the TXD pin for longer than tDST, the transmitter is disabled thus allowing the LIN bus to return to the recessive state and communication to resume on the bus. The timer is reset by a rising edge on TXD pin. This pin 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 TPIC1021 to be used with 3.3 V and 5 V I/O microcontrollers. If the microcontroller’s RXD pin does not have an integrated pull-up, an external pull-up resistor to the microcontroller I/O supply voltage is required. 2 |
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