|Category||Analog & Mixed-Signal Processing => Switches & Multiplexers => Power Low Side Switches|
|Title||Power Low Side Switches|
|Description||MC33291L Eight Output Switch With Serial Peripheral Interface Smartmos|
|Company||Motorola Semiconductor Products|
|Datasheet||Download MC33291LDW datasheet
33291L Eight Output Switch with Serial Peripheral Interface I/O
The 33291L device is an eight output, low side power switch with 8-bit serial input control. The is a versatile circuit designed for automotive applications, but is well suited for other environments. The 33291L incorporates SMARTMOS technology, with CMOS logic, bipolar/MOS analog circuitry, and DMOS power MOSFETs. The 33291L interfaces directly with a microcontroller to control various inductive or incandescent loads. The circuit's innovative monitoring and protection features include: Very Low Standby Current, SPI Cascade Fault Reporting Capability, Internal 53 V Clamp on Each Output, Output Specific Diagnostics, Independent Shutdown of Outputs. The device is parametrically specified over an ambient temperature range TA 125°C and 9.0 V VPWR 16 V supply. Features: Designed to Operate Over Wide Supply Voltages 26.5 V Interfaces to Microprocessor Using 8-Bit SPI I/O Protocol to 3.0 MHz 1.0 A Peak Current Outputs with Maximum RDS(on) - 150°C Outputs Current Limited to Accommodate In-rush Currents Associated with Switching Incandescent Loads Output Voltages Clamped 53 V During Inductive Switching Maximum Sleep Current (IPWR) of 25 µA Maximum 4.0 mA IDD During OperationSFPD CS Microcontroller SCLK SI RST CMOS Serial Shift Registers and Latches
Updrain DMOS Output 3 Output Switches and Output 4 Sense Circuits
Voltage Regulator GE OVD OT VDD RB OF SFPD SFL CS SPI SCLK Interface SI Logic SO CSI CSBI
Open Load Detect Short Circuit Detect
FAULT OPERATION Serial Output (SO) Pin Reports
Over Voltage Over Temperature Over Current Output ON, Open Load Fault Over voltage condition reported Fault reported by Serial Output (SO) pin SO pin reports short to battery/supply or over current condition Not reportedOutput OFF, Open Load Fault SO pin reports output OFF open load condition
Over Voltage Over Temperature Over Current Total device shutdown at VPWR 36 V. All outputs are latched off while the SPI register is reset (cleared). Outputs can be turned back on with a new SPI command after VPWR has decayed below 26.5 V. Only the output experiencing an over temperature condition turns OFF. Only the output experiencing an over current shuts down 3.0 A after 250 µs delay, with SFPD pin grounded. All other outputs will continue to operate in a current limit mode, with no shutdown, if the SFPD pin 5.0 V (so long as the individual outputs are not experiencing thermal limit conditions).MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
Pin Name OP7 OP6 SCLK SI GND OP3 OP2 SFPD VDD GND VPWR RST OP1 OP0 Description Output 7. This pin provides connection to drain of output MOSFET number seven. Output 6. This pin provides connection to drain of output MOSFET number six. System Clock. This pin clocks the internal Shift registers of the 33291L. Serial Input. This pin is for the input of serial instruction data. SI information is read on the falling edge of SCLK. Ground. This pin provides connection to IC Power Ground and functions as part of heat sinking path. Ground. This pin provides connection to IC Power Ground and functions as part of heat sinking path. Ground. This pin provides connection to IC Power Ground and functions as part of heat sinking path. Ground. This pin provides connection to IC Power Ground and functions as part of heat sinking path. Serial Output. This pin is the tri-stateable output from the Shift register. Chip Select. Whenever this pin in a logic low state, data can be transferred from the MCU to the 33291L through the SI pin and from the 33291L to the MCU through the SO pin. Output 5. This pin provides connection to drain of output MOSFET number five. Output 4. This pin provides connection to drain of output MOSFET number four. Output 3. This pin provides connection to drain of output MOSFET number three. Output 2. This pin provides connection to drain of output MOSFET number two. Short Fault Protect Disable. This pin is used to prevent the outputs from latching-OFF because of an over current condition. Logic Supply. Ground. This pin provides connection to IC Power Ground and functions as part of heat sinking path. Ground. This pin provides connection to IC Power Ground and functions as part of heat sinking path. Ground. This pin provides connection to IC Power Ground and functions as part of heat sinking path. Ground. This pin provides connection to IC Power Ground and functions as part of heat sinking path. Output MOSFET Gate Drive Supply. RESET. This pin is active low. It is used to clear the SPI Shift register, thereby setting all output switches OFF. Output 1. This pin provides connection to drain of output MOSFET number one. Output 0. This pin provides connection to drain of output MOSFET number zero.
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