Texas Instruments TPL5111EVM User manual

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
powered by either an on board battery holder (coin battery) or by an external voltage source.
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Normal
operation
I_SEL
TPL5111 Current
measurement
I_SEL
www.ti.com 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
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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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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
}
}
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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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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)
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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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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.
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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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