Texas Instruments TPS382-Q1EVM User manual

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TPS382-Q1EVM (MSA011) Voltage Supervisor with Watchdog Timer User
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User's Guide
SGLU009–November 2016
TPS382-Q1EVM (MSA011) Voltage Supervisor with
Watchdog Timer User Guide
This user’s guide describes the TPS382-Q1EVM evaluation module (EVM). This guide contains the EVM
schematic, bill of materials (BOM), assembly drawing, and top and bottom board layouts.
Contents
1 Introduction ................................................................................................................... 2
2 Schematic, Bill of Materials, and Layout ................................................................................. 2
3 EVM Connectors............................................................................................................. 6
4 EVM Setup and Operation ................................................................................................. 8
List of Figures
1 TPS382-Q1EVM Board..................................................................................................... 2
2 TPS382-Q1EVM Schematic................................................................................................ 3
3 Component Placement—Top Assembly.................................................................................. 5
4 Component Placement—Bottom Assembly.............................................................................. 5
5 Layout—Top.................................................................................................................. 5
6 Layout—Bottom.............................................................................................................. 5
7 Top Layer..................................................................................................................... 5
8 Bottom Layer................................................................................................................. 5
9 Top Solder Mask............................................................................................................. 6
10 Bottom Solder Mask......................................................................................................... 6
11 TPS3820-33-Q1 RESET Asserted Due to Falling VCC ................................................................ 8
12 TPS3820-33-Q1 RESET De-Asserted Due to Rising VCC, With Delay td........................................... 8
13 TPS3828-33-Q1 RESET De-Asserted Due to Rising VCC, With Delay td........................................... 8
14 TPS3820-33-Q1 RESET Asserted Due to MR Being Pulled Low..................................................... 9
15 TPS3820-33-Q1 RESET De-Asserted to MR Being Pulled High, With Delay td.................................... 9
16 TPS3823-25-Q1 RESET De-Asserted to MR Being Pulled High, With Delay td.................................... 9
17 TPS3820-33-Q1 Watchdog Timeout ttout, From WDI Falling to RESET Falling...................................... 9
18 TPS3824-30-Q1 Watchdog Timeout ttout, From WDI Falling to RESET Falling...................................... 9
List of Tables
1 BOM .......................................................................................................................... 4
2 Test Points.................................................................................................................... 6
3 List of Onboard Jumpers ................................................................................................... 7
4 List of Input and Output Connectors ...................................................................................... 7
5 Nominal Supply and Typical Threshold Voltages........................................................................ 8

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Trademarks
All trademarks are the property of their respective owners.
1 Introduction
The TPS382-Q1EVM is an evaluation module (EVM) for the TPS382x-Q1 family of voltage supervisors.
The EVM has an operating voltage range of 1.1 V to 5.5 V, and offers input connections for all device
input and output pins. All of the devices have separate supply connections, separate input and output
lines, and all devices share a common ground. This allows the user to test multiple devices simultaneously
with different supply voltages and different input conditions. Test points are provided to give the user
access to multiple ground points.
Figure 1. TPS382-Q1EVM Board
1.1 Related Documentation
TPS382x-xx-Q1 Voltage Monitor With Watchdog Timer data sheet, SGLS143
1.2 TPS382x-Q1 Applications
• Automotive DSP’s, Microcontrollers, or Microprocessors
• Safety-Critical Systems
• Automotive Systems
2 Schematic, Bill of Materials, and Layout
This section provides a detailed description of the TPS382-Q1EVM Schematic, bill of materials (BOM),
and layout.

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2.1 TPS382-Q1EVM Schematic
Figure 2. TPS382-Q1EVM Schematic

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2.2 TPS382-Q1EVM Bill of Materials
Table 1. BOM
DESIGNATOR QUANTITY VALUE DESCRIPTION PACKAGE REFERENCE PART NUMBER MANUFACTURER
!PCB 1 Printed Circuit Board MSA011 Any
C1, C2, C3, C4, C5 5 0.1uF CAP, CERM, 0.1 µF, 16 V, ± 10%,
X7R, AEC-Q200 Grade 1, 0603 0603 GCM188R71C104KA37J MuRata
J1, J3, J4, J5, J7, J8, J9,
J10, J11, J12, J13, J15,
J16, J17, J20, J21
16 Header, 2.54 mm, 2x1, Gold, R/A,
SMT Header, 2.54 mm, 2x1, R/A, SMT 87898-0204 Molex
J2, J6, J14, J18 4 Header, 100mil, 3x1, Tin, TH Header, 3 PIN, 100mil, Tin PEC03SAAN Sullins Connector
Solutions
J19 1 Header, 2.54mm, 1x2, Tin, Black, TH Header, 2.54mm, 2x1, TH PEC01DAAN Sullins Connector
Solutions
R1 1 10k RES, 10 k, 5%, 0.1 W, 0603 0603 CRCW060310K0JNEA Vishay-Dale
SH-J1, SH-J2, SH-J3, SH-
J4, SH-J5 5 1x2 Shunt, 100mil, Gold plated, Black Shunt 969102-0000-DA 3M
TP1, TP2, TP3, TP4, TP5 5 Test Point, Compact, SMT Testpoint_Keystone_Comp
act 5016 Keystone
U1 1 Voltage Monitor With Watchdog Timer,
DBV0005A DBV0005A TPS3823-25QDBVRQ1 Texas Instruments
U2 1 Voltage Monitor With Watchdog Timer,
DBV0005A DBV0005A TPS3820-33QDBVRQ1 Texas Instruments
U3 1 Voltage Monitor With Watchdog Timer,
DBV0005A DBV0005A TPS3825-50QDBVRQ1 Texas Instruments
U4 1 Voltage Monitor With Watchdog Timer,
DBV0005A DBV0005A TPS3824-30QDBVRQ1 Texas Instruments
U5 1 Voltage Monitor With Watchdog Timer,
DBV0005A DBV0005A TPS3828-33QDBVRQ1 Texas Instruments
FID1, FID2, FID3 0 Fiducial mark. There is nothing to buy
or mount. Fiducial N/A N/A

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2.3 Layout and Component Placement
Figure 3 and Figure 4 top and bottom assemblies of the printed circuit board (PCB) show the component
placement on the EVM.
Figure 5 and Figure 6 show the top and bottom layouts, Figure 7 and Figure 8 show the top and bottom
layers, and Figure 9 and Figure 10 show the top and bottom solder masks of the EVM.
Figure 3. Component Placement—Top Assembly Figure 4. Component Placement—Bottom Assembly
Figure 5. Layout—Top Figure 6. Layout—Bottom

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Figure 7. Top Layer Figure 8. Bottom Layer
Figure 9. Top Solder Mask Figure 10. Bottom Solder Mask
3 EVM Connectors
This section describes the connectors, jumpers, and test points on the EVM as well as how to connect, set
up, and properly use the EVM. Each device has an independent supply connection, but all grounds are
connected on the board.
3.1 EVM Test Points
Table 2 lists the test points and functional descriptions.
Table 2. Test Points
Test Point Function Description
Number Silkscreen Label
TP1 – TP5 GND Ground Common ground connection

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3.2 EVM Jumpers
Table 3 lists the jumpers onboard the TPS382-Q1EVM. As ordered, the TPS382-Q1EVM will have five
jumpers installed.
Table 3. List of Onboard Jumpers
Jumper Device Default Connection Description
J2 TPS3820-33-Q1 VDD to MR Connect MR to GND to force the device into
reset. Otherwise, connect MR to VDD or leave
MR floating.
J6 TPS3823-25-Q1 VDD to MR Connect MR to GND to force the device into
reset. Otherwise, connect MR to VDD or leave
MR floating.
J14 TPS3825-50-Q1 VDD to MR Connect MR to GND to force the device into
reset. Otherwise, connect MR to VDD or leave
MR floating.
J18 TPS3828-33-Q1 VDD to MR Connect MR to GND to force the device into
reset. Otherwise, connect MR to VDD or leave
MR floating.
J19 TPS3828-33-Q2 Shorted Enables the pullup to VDD for the open-drain
reset output. To use a different pullup voltage,
remove the shunt from J19 and supply a
different voltage to J19 pin 2.
3.3 EVM Input and Output Connectors
The following 2-pin headers are input and output connecters for each device.
Table 4. List of Input and Output Connectors
Jumper Device Description
J1 TPS3820-33-Q1 Supply voltage for TPS3820-33-Q1 and common ground.
J3 WDI pin for watchdog input. Leave floating if unused.
J4 Active low reset output.
J5 TPS3823-25-Q1 Supply voltage for TPS3823-25-Q1 and common ground.
J7 Active low reset output.
J8 WDI pin for watchdog. Leave floating if unused.
J9 TPS3824-30-Q1 Supply voltage for TPS3824-30-Q1 and common ground.
J10 WDI pin for watchdog. Leave floating if unused.
J11 Active low reset output.
J12 Active high reset output.
J13 TPS3825-50-Q1 Supply voltage for TPS3825-50-Q1 and common ground.
J15 Active low reset output.
J16 Active high reset output.
J17 TPS3828-33-Q1 Supply voltage for TPS3828-33-Q1 and common ground.
J20 WDI pin for watchdog input. Leave floating if unused.
J21 Active low reset output.

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4 EVM Setup and Operation
This section describes the functionality and operation of the TPS382-Q1EVM. The user should read the
TPS382x-Q1 datasheet for electrical characteristics of the device.
4.1 Input Power (VDD)
All VDD supplies are isolated from each other on the EVM, so all devices can be simultaneously powered
at different voltages. Table 5 lists the nominal supply voltage and typical reset threshold voltage for each
device. The supply voltage on any device should not exceed 5.5V.
Table 5. Nominal Supply and Typical Threshold Voltages
Device Nominal Supply Voltage (V) Typical Threshold Voltage (V)
TPS3820-33-Q1 3.3 2.93
TPS3828-33-Q1
TPS3823-25-Q1 2.5 2.25
TPS3824-30-Q1 3.0 2.63
TPS3825-50-Q1 5.0 4.55
Figure 11. TPS3820-33-Q1 RESET Asserted Due to
Falling VCC Figure 12. TPS3820-33-Q1 RESET De-Asserted Due to Rising VCC, With Delay td
Figure 13. TPS3828-33-Q1 RESET De-Asserted Due to Rising VCC, With Delay td

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4.2 Manual Reset (MR)
The TPS3820-Q1, TPS3823-Q1, TPS3825-Q1, and TPS3828-Q1 devices offer a manual reset pin. The
EVM uses a 3-pin header for the MR pin of each device, and a jumper to connect the MR pin to VDD or
GND. When MR is pulled low, the RESET output will be asserted (low for RESET pins and high for
RESET pins). When this pin is pulled high or left floating, the reset output will be dependent on the supply
voltage and WDI inputs on devices with WDI pin.
Figure 14. TPS3820-33-Q1 RESET Asserted Due to MR
Being Pulled Low Figure 15. TPS3820-33-Q1 RESET De-Asserted to MR Being Pulled High, With Delay td
Figure 16. TPS3823-25-Q1 RESET De-Asserted to MR Being Pulled High, With Delay td
4.3 Watchdog Input (WDI)
The TPS3820-Q1, TPS3823-Q1, TPS3824-Q1, and TPS3828-Q1 have a watchdog to monitor a
microcontroller. The EVM offers a 2-pin header for the WDI pin for each of these devices, and both header
pins are connected to the device WDI pin. The device requires a positive or negative transition on the WDI
pin within the ttout time to avoid asserting the reset. If the device does not receive a transition on WDI, it will
assert the reset output. When using the watchdog, the WDI pin should not exceed VDD by more than
0.3 V. When unused, the WDI pin can be left floating.

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Revision History
Figure 17. TPS3820-33-Q1 Watchdog Timeout ttout, From
WDI Falling to RESET Falling Figure 18. TPS3824-30-Q1 Watchdog Timeout ttout, From WDI Falling to RESET Falling
4.4 Reset Outputs (RESET and RESET)
All TPS382x-Q1 devices offer an active-low RESET signal, while TPS3824-Q1 and TPS3825-Q1 offer an
additional active-high RESET signal. The EVM has a 2-pin header for each RESET and RESET pin, with
both header pins shorted together. The reset signal will be asserted (low for RESET pins and high for
RESET pins) when the supply voltage drops below the threshold voltage, when MR is pulled low, or when
a trigger is not detected on the WDI pin for time ttout. When VDD is higher than the threshold voltage, the
MR pin is pulled high or floating, and WDI is triggered or left floating, then the reset pins will remain
de-asserted
Revision History
DATE REVISION NOTES
November 2016 * Initial Release