TPS22985

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SLVSBA9B – MARCH 2012 – REVISED JUNE 2012

DEVICE INFORMATION

PIN FUNCTIONS

PIN NAME

TYPE

DESCRIPTION

VDD1

Supply

Device Supply 1. 0V to 19.8-V Input.

VDD2

Supply

Device Supply 2. 0V to 19.8-V Input.

OUTA

Output

Output A. 10-mA capable output. Refer to the Supply Selection section for more information.

OUTB

Output

Output B. 500-mA capable output. Refer to the Normal Mode and Control Mode sections for more information.

CPO

Output

Charge Pump Output. This pin is the output of the internal charge pump. It drives the gates of the internal FET

switches. Connect a capacitor of at least 2nF to this pin.

CFG/OE

Input

Mode Configuration/Output Enable. When CFG is floating, the device is in Normal Mode. When CFG is

ground, the device is in Control Mode (see the APPLICATION INFORMATION section for more information).

The mode is latched at power-up. When the device enters Control Mode, this pin becomes an output enable for

the UART TXH output. See the UART RX and TX section for more information. A pull-down resistance between

this pin and GND is recommended when Control Mode is desired.

RXH

Input

UART RX Input. Monitored Input for data activity to enable outputs. In Control Mode, this pin is monitored for a

high to low transition to enable the outputs. This input is level shifted and driven on RXC. See the UART RX

and TX section for more information.

RXC

Output

UART RX Output. This output is a level shifted version of RXH. RXC is referenced to OUTA. See the UART

RX and TX section for more information.

TXC

Input

UART TX Input. This input is buffered and level shifted on TXH. See the UART RX and TX section for more

information.

TXH

Output

UART TX Output. This output is a buffered and level shifted version of TXC. TXH is referenced to OUTA. See

the UART RX and TX section for more information.

RESETZ

Output

Microcontroller Reset. This pin is a delayed reset signal indicating OUTB is connected to a valid VDD.

RESETZ in an open-drain pull-down. RESETZ is low when OUTB is high impedance.

ENB

Input

OUTB Enable. In Normal Mode, this pin is the active high OUTB enable. In Control Mode, this pin opens OUTB

when asserted high and resets the device until a new transition on RX occurs.

GND

Supply

Device ground.

Copyright © 2012, Texas Instruments Incorporated

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Product Folder Link(s): TPS22985