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TPIC9202PWPG4 데이터시트(PDF) 4 Page - Texas Instruments |
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TPIC9202PWPG4 데이터시트(HTML) 4 Page - Texas Instruments |
4 / 18 page www.ti.com DETAILED DESCRIPTION TPIC9202 MICROCONTROLLER POWER SUPPLY AND MULTIPLE LOW-SIDE DRIVER SLIS116B – MAY 2005 – REVISED JUNE 2006 The 5-V regulator is powered from VIN, 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 (RDELAY) 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 TPIC9202. 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. 4 Submit Documentation Feedback |
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