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4-Channel Serial And Parallel Low-Side Pre-FET Driver (Rev. B)
Texas Instruments

Description
The TPIC44L01, TPIC44L02, and TPIC44L03 are low-side predrivers that provide serial and parallel input interfaces to control four external FET power switches such as offered in the TI TPIC family of power arrays. These devices are designed primarily for low-frequency switching, inductive load applications such as solenoids and relays. Fault status for each channel is available in a serial-data format. Each driver channel has independent off-state open-load detection and on-state shorted-load/short-to-battery detection. Battery overvoltage and undervoltage detection and shutdown is provided on the TPIC44L01/L02. On the TPIC44L03 driver, only over-battery voltage shutdown is provided. Each channel also provides inductive-voltage-transient protection for the external FET. These devices provide control of output channels through a serial input interface or a parallel input interface. A command to enable the output from either interface enables the respective channels gate output to the external FET. The serial interface is recommended when the number of signals between the control device and the predriver must be minimized and the speed of operation is not critical. In applications where the predriver must respond very quickly or asynchronously, the parallel input interface is recommended. For serial operation, the control device must transition CS\ from high to low to activate the serial input interface. When this occurs, SDO is enabled, fault data is latched into the serial interface, and the fault flag is refreshed. Data is clocked into the serial registers on low-to-high transitions of SCLK through SDI. Each string of data must consist of at least four bits of data. In applications where multiple devices are cascaded together, the string of data must consist of four bits for each device. A high data bit turns the respective output channel on and a low data bit turns it off. Fault data for the device is clocked out of SDO as serial input data is clocked into the device. Fault data consists of fault flags for shorted-load and open-load flags (bits 0?3) for each of the four output channels. A high bit in the fault data indicates a fault and a low bit indicates that no fault is present for that channel. Fault register bits are set or cleared asynchronously to reflect the current state of the hardware. A fault must be present when CS\ is transitioned from high to low to be captured and reported in the serial fault data. New faults cannot be captured in the serial register when CS\ is low. CS\ must be transitioned high after all of the serial data has been clocked into the device. A low-to-high transition of CS\ transfers the last four bits of serial data to the output buffer puts SDO in a high-impedance state and clears and reenables the fault register. The TPIC44L01/L02/L03 was designed to allow the serial input interfaces of multiple devices to be cascaded together to simplify the serial interface to the controller. Serial input data flows through ......
Features
4-Channel Serial-In Parallel-In Low-Side Pre-FET Driver Devices Are Cascadable Internal 55-V Inductive Load Clamp and VGS Protection Clamp for External Power FETs Independent Shorted-Load/Short-to-Battery Fault Detection on All Drain Terminals Independent OFF-State Open-Load Fault Sense Over-Battery-Voltage Lockout Protection and Fault Reporting Under-Battery Voltage Lockout Protection for the TPIC44L01 and TPIC44L02 Asynchronous Open-Drain Fault Flag Device Output Can Be Wire-ORed With Multiple Devices Fault Status Returned Through Serial Output Terminal Internal Global Power-On Reset of Device and External RESET Terminal High-Impedance CMOS-Compatible Inputs With Hysteresis TPIC44L01 and TPIC44L03 Disables the Gate Output When a Shorted-Load Fault Occurs TPIC44L02 Transitions the Gate Output to a Low-Duty Cycle PWM Mode When a Shorted-Load Fault Occurs

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