Texas Instruments TPL5111EVM Manuel utilisateur

TPL5111EVM User 's Guide

User's Guide

Literature Number: SNAU183

July 2015

User's Guide

SNAU183–July 2015

TPL5111EVM User 's Guide

1 Introduction

Figure 1. Top View of TPL5111EVM

The Texas Instruments TPL5111EVM evaluation module (EVM) allows a system designer to:

• Configure the timer interval of the TPL5111, using resistors REXT_1 and REXT_2.

• Observe the DRVn, DONE signals

• Measure current consumption

• Exercise the TIMER and ONE_SHOT modes

• Stimulate the DONE input.

The DRVn output of the TPL5111 is connected to the EN (enable) pin of a TI TPS61029 boost converter.

The periodic DRVn signal enables/disables the boost converter, demonstrating a power gating

implementation. The output of the TPS61029 drives a green LED, indicating when the output voltage is

active. The TPL5111EVM may be connected to the MSP430F5529 Launchpad in order to test its

watchdog and timer features in a microprocessor system. The output bus of the boost converter is

connected to the Launchpad connector to provide gated power to the Launchpad. The EVM may be

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Normal

operation

I_SEL

TPL5111 Current

measurement

I_SEL

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Setup

The EVM contains one TPL5111 timer and one TPS61029 boost converter (See Table 1).

Table 1. Device and Package Configurations

DEVICE IC PACKAGE

U1 TPL5111DDC SOT23-6

U2 TPS61029 VSON(10)

2 Setup

This section describes the jumpers and connectors on the EVM as well and how to properly connect, set

up and use the TPL5111EVM.

Input/Output Connector Descriptions

Name Layer Description

J1/J3 Bottom 2 x 10 pin receptacle to plug the TPL5111EVM into MSP430F5529 Launchpad.

J4/J2 Bottom 2 x 10 pin receptacle to plug the TPL5111EVM into MSP430F5529 Launchpad.

RST Bottom 2 pin receptacle to plug the TPL5111EVM into MSP430F5529 Launchpad.

VCC Bottom 2 pin receptacle to plug the TPL5111EVM into MSP430F5529 Launchpad.

IO Top 4-pin header connector to bring out VDD_uC, DRVn, DONE and GND signals.

Jumper Description

Name Layer Description

I_SEL Top The jumper should be installed for normal operation. Remove the jumper and connect

a DMM to the terminal pins to measure current.

Figure 2. I_SEL Jumper Setting

Table 2. Switch Descriptions

Name Layer Description

S_ON_OFF Bottom The S_ON_OFF switch ensures that only one voltage source is driving the internal

power buses. The common pin (Pin 2) of the switch is directly connected to the input

of the TPS61029. V_BATT position selects an installed battery as the voltage source

for the board functions. The AUX_VDD position selects the source attached to the

AUX_VDD terminal as the voltage source for the board functions.

MODE_SW Bottom TIMER position (VDD) selects the TIMER mode of operation for the TPL5111. The

ONE_SHOT position (GND) selects the ONE SHOT mode of operation for the

TPL5111.

DONE Top SPST switch. Generates a DONE pulse when pressed.

M_DRV Top SPST switch. When pressed, connects VDD to the DELAY/M_DRV pin to simulate a

manual Power ON input to the TPL5111.

Test Point Descriptions

Name Layer Description

GND Layer 2 Ground (GND) test point.

V_BATT Layer 3 Battery voltage test point

AUX_VDD Layer 3 Connection for external voltage source

SNAU183–July 2015 TPL5111EVM User 's Guide

Setup

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2.1 EVM Configuration

As shipped, the EVM is configured to provide a 2 second timer interval, based on the parallel combination

of REXT_1 and REXT_2. The evaluation board can operate as standalone or plugged into the

MSP430F5529 Launchpad. For either option, the only configuration that is required is the selection of the

voltage source supplied to the board. Use the S_ON_OFF switch to select the voltage source (see

Table 2).

2.1.1 Using a Battery as the Voltage Source

1. Place the S_ON_OFF switch to the AUX_VDD position.

2. Insert a CR2032 coin cell battery in the battery holder (BATT)

3. Place the S_ON_OFF switch in the V_BATT position. This selects the battery as the source for the on-

board VDD bus, which powers the TPL5111. The I_SEL jumper must be in place to energize the VDD

bus.

2.1.2 Using an External Source as the Voltage Source

1. Place the S_ON_OFF switch in the V_BATT position

2. Connect an external 3 volt source between the AUX_VDD and GND pins.

3. Place the S_ON_OFF switch in the AUX_VDD position.

2.1.3 EVM with Micro Controller

1. Disable power to the TPL5111EVM.

2. Connect a microcontroller system to the EVM using the IO header pins (VDD_uC, DRVn, DONE and

GND).

3. Connect a voltage source as described in either Section 2.1.1 or Section 2.1.2 and place the

S_ON_OFF switch in the appropriate position.

WARNING

Do NOT use the DONE switch in this configuration. The DONE

signal should be supplied by the microcontroller.

2.1.4 EVM with Launchpad

Load the code presented in this section into the MSP430 of the Launchpad. Refer to the MSP430

Launchpad documentation (MSP430 Launchpad (MSP-EXP430F5529) Wiki) for more details.

1. Remove the jumpers VCC and RST of the Launchpad.

2. Plug the EVM into the Launchpad (MSP430F5529) according to the table below:

TPL5111EVM MSP430 Launchpad

J1/J3 J1/J3

J4/J2 J4/J2

VCC 3V3

RST SBW RST

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Setup

3. Connect a voltage source to the TPL5111EVM as described in either Section 2.1.1 or Section 2.1.2.

4. Place the S_ON_OFF switch of the TPL5111EVM in the appropriate position

WARNING

Do NOT use the DONE switch in this configuration. The DONE

signal should be supplied by the MSP430 on the Launchpad.

Example Code

Once loaded into the MSP430 of the Launchpad, the code below performs the following functions, in

sequence:

• At power on, the green LED present on the Launchpad is turned on.

• Then the red LED present on the Launchpad is turned on

• After that both green and red LEDs are turned off

• The MSP430 sends the DONE signal to the TPL5111

Before launching the code set a timer interval > 5s (REXT_1 || REXT_2 > 8.85KΩ)

#include <msp430.h>

int main(void)

{

WDTCTL = WDTPW+WDTHOLD; // Stop watchdog timer

__delay_cycles(50000); // Set Delay;

P1DIR |= BIT0; // Set P1.0 to output direction

P2DIR |= BIT3; // Set P2.3 to output direction

P4DIR |= BIT7; // Set P4.7 to output direction

P1OUT &= ~BIT0; // Set P1.0 RED LED OFF

P2OUT &= ~BIT3; // Set P2.3 DONE Low

P4OUT &= ~BIT7; // Set P4.7 GREEN LED OFF

while (1)

{

__delay_cycles(10000); // Set Delay;

P4OUT |= BIT7; // Set P4.7 GREEN LED ON

__delay_cycles(1000000); // Set Delay;

P1OUT |= BIT0; // Set P1.0 RED LED ON

__delay_cycles(500000); // Set Delay;

P1OUT &= ~BIT0; // Set P1.0 RED LED OFF

P4OUT &= ~BIT7; // Set P4.7 GREEN LED OFF

__delay_cycles(100000); // Set Delay;

P2OUT |= BIT3; // Done High

__delay_cycles(1000); // Set Delay;

P2OUT &= ~BIT3; // Set P2.3 DONE Low

}

SNAU183–July 2015 TPL5111EVM User 's Guide

Operation

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3 Operation

Once the EVM is powered ON, the TPL5111 starts running. Refer to the datasheet of the TPL5111 for

further details on the timing. The TPL5111 has 2 modes of operation: TIMER mode and ONE SHOT

mode.

3.1 Timer Mode

In TIMER mode, the TPL5111 generates a periodic pulse at the DRVn pin. When a DRVn signal is

asserted by the TPL5111, the output of the TPS61029 is enabled, and the GREEN LED (D1) is turned on.

If the DONE switch is pushed, a DONE pulse is sent to the TPL5111, which de-asserts the DRVn pulse,

disabling the TPS61029, and turning off the GREEN LED. If the DONE switch is not pushed, the DRVn

pulse length is equal to the programmed value set by REXT_1 and REXT_2, minus 50 ms. When the

M_DRV switch is pushed, VDD is connected to the DELAY/M_DRV pin, simulating a manual power on

signal to the TPL5111. The length of the DRVn pulse in this case is equal to the amount of time the

M_DRV switch is pressed, plus the programmed time interval.

The DRVn pulse may be observed by attaching an oscilloscope probe to the DRV_N pin, as indicated in

Figure 3.

Figure 3. Signal Monitoring Points

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Operation

3.1.1 DRVn and DONE Operation

To simultaneously observe the timing of the DRVn pulse along with the DONE signal, use a two channel

scope to probe the DRV_N and the DONE pins. Ensure that the MODE_SW is in the TIMER position.

Immediately after a rising edge of the DRV_N signal, press and release the DONE switch on the board.

When the DONE signal is asserted, the DRVn pulse should de-assert.

Figure 4. DONE and DRVn Signal Behavior in Timer Mode

3.1.2 DRVn and Boost Converter Output

To simultaneously observe the timing of the DRVn pulse along with the output of the boost converter, use

a two channel scope to probe the DRV_N and the VDD_UC pins. Immediately after a rising edge of the

DRV_N signal, the output of the boost converter should turn on, with a delay of approximately 2.5 ms to 5

ms. The output level should be approximately 3.3V.

Figure 5. Boost Converter Input (DRVn) and Output (VDD)

SNAU183–July 2015 TPL5111EVM User 's Guide

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.

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Operation

Figure 6. EVM, DMM and Power Supply Connection for TPL5111 Supply Current Measurements

5. Enable the output of the power supply. Ensure that it is set to 2.5V.

6. Set the S_ON_OFF switch of the EVM to AUX_VDD.

7. The current measured by the DMM should be in the range of 20 nA to 50 nA.

SNAU183–July 2015 TPL5111EVM User 's Guide

Operation

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3.3.1 Resistance Reading Current

This procedure is used to only measure the current of the TPL5111 in startup 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 ONE SHOT position.

3. Remove the I_SEL jumper.

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

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

5. Enable the output of the power supply. Ensure that it is set to 2.5V.

6. Set the S_ON_OFF switch of the EVM to AUX_VDD.

7. Press and hold the M_DRV switch.

8. The current measured by the DMM should be in the range of 330 µA to 400 µA.

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