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EVM Setup

2.2 Current-Limit Adjustment

Potentiometer R4 controls the resistance RILIM that sets the TPS211xA current limit threshold. Adjusting

R4 clockwise increases the current limit threshold by decreasing RILIM. The current limit threshold is

500/RILIM for the TPS2113A and TPS2115A.

To measure the resistance RILIM, connect an ohmmeter between test points TP4 and GND. The

measurement should be made with the IN1 and IN2 supplies off. To ensure accurate in-circuit resistance

measurements, the ohmmeter must apply no more than 0.5 V across the resistor.

2.3 Manual Switching Mode (TPS2115A Only)

Potentiometer R2 and header J4 do not affect the operation of the manual switching mode.

Some products like digital cameras and hand-held devices that receive power from an internal battery or

from a docking station can take advantage of the manual-switching feature. The TPS2115A digital control

input, D1, can directly sense the presence of the docking station and connect the load to the appropriate

power source.

2.3.1 Configuring the TPS2115A for Manual Switching

To place the device into manual switching mode, short header J2. The logic level on the D1 pin

determines which input is selected. On the EVM, header J3 controls the D1 pin. If J3 is left open, then D1

is internally pulled high and IN1 is selected. If J3 is shorted, then D1 is pulled low and IN2 is selected.

2.4 Automatic Switching Modes

All EVMs support Mode 1 automatic switching. Mode 2 automatic switching is supported by the TPS2113A

EVM only.

2.4.1 Mode 1 Automatic Switching

OUT connects to the higher of IN1 and IN1 in Mode 1 automatic switching. Refer to Table 2-1 to configure

the EVM for Mode 1 automatic switching.

Table 1. EVM Shorting Jumper Placement for Mode 1 Automatic Switching

HEADER

EVM DEVICE

J1 J2 J3 J4

HPA581-001 TPS2113A OUT IN OUT OUT

HPA581-002 TPS2115A OUT OUT IN OUT

A manufacturer can provide a secondary battery pack option to extend the product run time with Mode 1

automatic switching. The TPS211xA cycles between the primary and secondary batteries until both

batteries are drained.

SLUU409–February 2010 TPS211xADRB EVM, Power Multiplexer Evaluation Module

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