TI TPL9202PWP

The power supply provides regulated 5-V output to power the system microcontroller and drive eight low-side switches. The brown-out detection output (BO_OUTZ) warns the system if there is a temporary drop in the supply voltage, so the system can prevent potentially hazardous situations. A serial communications interface controls the eight low-side outputs; each output has an internal snubber circuit to absorb the inductive load at turn OFF. Alternatively, the system can use a fly-back diode to V_IN to help recirculate the energy in an inductive load at turn OFF. The 5-V regulator is powered from V_IN, and the regulated output is within 5 V ±5% over the operating conditions. The open-drain power-on reset (RST) pin remains low until the regulator exceeds the set threshold, and the timer value set by the capacitor on the reset delay (R_DELAY) pin expires. If both of these conditions are satisfied, RST is asserted high. This signifies to the microcontroller that serial communications can be initiated to the TPL9202. The serial communications is an 8-bit format, with data transfer synchronized using a serial clock from the microcontroller. A single register controls all the outputs (one bit per output). The default value is zero (OFF). If an output requires pulse width modulation (PWM) function, the register must be updated at a rate faster than the desired PWM frequency. OUT1 can be controlled by serial input from the microcontroller or with the dedicated enable (EN1) pin. If EN1 is pulled low or left open, the serial input through the shift register controls OUT1. If EN1 is pulled high, OUT1 always is turned on, and the serial input for OUT1 is ignored. The brown-out (BO) input is a resistor divided from the input supply and is used to determine if the supply voltage drops to undesired levels. If the input drops below the programmed value, BO_OUTZ is pulled low, and all outputs are disabled. Once the input supply line returns to the minimum desired level, the outputs are enabled to the previous programmed states. If RST is asserted, all outputs are turned OFF internally, and the input register is reset to all zeroes. The microcontroller must write to the register to turn the outputs ON again.

• Eight Low-Side Drivers With Internal Clamp for Inductive Loads and Current Limiting for Self Protection
• Seven Outputs Rated at 150 mA and Controlled Through Serial Interface
• One Output Rated at 150 mA and Controlled Through Serial Interface and Dedicated Enable Pin
• 50 × ±5% Regulated Power Supply With 200-mA Load Capability at V_IN Max of 18 V
• Internal Voltage Supervisory for Regulated Output
• Serial Communications for Control of Eight Low-Side Drivers
• Enable/Disable Input for OUT1
• 5-V or 3.3-V I/O Tolerant for Interface to Microcontroller
• Programmable Power-On Reset Delay Before RST Asserted High, Once 5 V Is Within Specified Range (6 ms Typ)
• Programmable Deglitch Timer Before RST Asserted Low (40 μs Typ)
• Programmable Brown-Out Feature
• Thermal Shutoff for Self Protection

• Electrical Applicances
• Air Conditioning Units
• Ranges
• Dishwashers
• Refrigerators
• Microwaves
• Washing Machines
• General-Purpose Interface Circuit Allowing Microcontroller Interface to Relays, Electric Motors, LEDs, and Buzzers