Operation

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3.2

One Shot Mode

In ONE SHOT mode of operation, the TPL5111 asserts the DRVn signal at power on and when M_DRV is

asserted. To observe this mode of operation, use a two channel scope to monitor the DRV_N pin and the

DONE pin. Place the MODE_SW in the ONE SHOT position. Cycle power on the board in order to

reinitiate a power on sequence.

Once the EVM is powered ON, the TPL5111 asserts the DRVn signal, which enables the TPS61029

output, turning on the GREEN LED (D1). If the DONE switch is pushed, a DONE pulse is sent to the

TPL5111. The DRVn output is de-asserted and the TPS61029 is disabled and the green LED is shut off.

At this point only a manual power on signal (press the M_DRV switch) can trigger another cycle. This

mode of operation is useful for on-demand power on.

3.3

Supply Current Measurement

Timer Mode

This procedure is used to only measure the current of the TPL5111 in Timer mode. An external power

supply set to 2.5V should be used for this measurement.

WARNING

The EVM should NOT be connected to the MSP430 Launchpad for

this measurement.

1. Disconnect the power source from the EVM. Set the S_ON_OFF switch to the V_BATT position.

2. Set the MODE_SW to the TIMER position.

3. Remove the I_SEL jumper.

4. Connect the EVM, a power supply and a digital multi-meter (DMM) as shown in Figure 6. The output of

the power supply should be OFF. The DMM should support 6 digits of resolution.

8

TPL5111EVM User 's Guide

SNAU183 – July 2015

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