Datasheet

EVM Setup

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2.4.2 Mode 2 Automatic Switching (TPS2113A Only)

In Mode 2 automatic switching, OUT connects to IN1 if the voltage at IN1 is sufficiently high; otherwise,

OUT connects to the higher of IN1 and IN2. The threshold at which IN1 is selected corresponds to

approximately 0.8 V at test point TP3. The corresponding value of the IN1 voltage depends upon the

setting of potentiometer R2. Adjusting R2 clockwise increases the IN1 selection threshold voltage.

Table 2. EVM Shorting Jumper Placement for Mode 2 Automatic Switching

HEADER

EVM DEVICE

J1 J2 J3 J4

HPA581-002 OUT IN OUT IN

A manufacturer can provide a secondary battery pack option to extend the product run time with Mode 2

automatic switching. The TPS2110A-TPS2113A drains the primary battery at IN1 and automatically

switches to the secondary battery at IN2.

2.5 Output Voltage Holdup

Headers J5-J8 select the output holdup capacitance.

The output voltage drops out for 60 ms (max) whenever the TPS211xA switches between the IN1 and IN2

supplies. Some capacitance at the TPS211xA output is necessary to prevent the output voltage from

dropping too much during the supply switchover. Excessive voltage drop can cause a system to reset or

lose data.

2.6 Switch Status

The switch status output can be monitored at the positive terminal of header J1. A switch status output

equal to logic 1 corresponds to an IN2 switch that is on.

TPS211xADRB EVM, Power Multiplexer Evaluation Module SLUU409–February 2010

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