Texas Instruments BQ25172EVM User manual

User’s Guide
BQ25172EVM Evaluation Module
ABSTRACT
This user’s guide describes the characteristics, operation, and use of the BQ25172EVM evaluation module
(EVM). This EVM is designed to help the user evaluate and test the various operating modes of the BQ25172.
This user’s guide includes setup instructions for the hardware and software, a schematic diagram, a bill of
materials (BOM), and PCB layout drawings for the evaluation module.
Throughout this user's guide, the abbreviations EVM, BQ25172EVM, BMS033, and the term evaluation module
are synonymous with the BMS033 evaluation module, unless otherwise noted.
Table of Contents
1 Introduction.............................................................................................................................................................................2
1.1 Printed Circuit Board Assembly......................................................................................................................................... 2
1.2 I/O Descriptions..................................................................................................................................................................2
2 Test Summary......................................................................................................................................................................... 3
2.1 Equipment.......................................................................................................................................................................... 3
2.2 Cautions............................................................................................................................................................................. 3
2.3 Test Instructions................................................................................................................................................................. 3
3 Board Layout, Schematic, and Bill of Materials...................................................................................................................4
3.1 Board Layout......................................................................................................................................................................4
3.2 Schematic.......................................................................................................................................................................... 7
3.3 Bill of Materials...................................................................................................................................................................8
4 Revision History................................................................................................................................................................... 12
Trademarks
All trademarks are the property of their respective owners.
WARNING
Hot surface! Contact may cause burns. Do not touch!
Some components may reach high temperatures >55°C when the board is powered on. The user must
not touch the board at any point during operation or immediately after operating, as high temperatures
may be present.
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1 Introduction
The Texas Instruments BQ25172EVM is a NiMH chemistry battery charger IC for single and multi cell
applications. Charging voltage can be adjusted using external resistors on VSET. Charging current can be set
from 60mA to 600mA with an external resistor on ISET.
1.1 Printed Circuit Board Assembly
The BQ25172EVM PCB contains the BQ25172 IC, LDO TPS7B8133 and support circuits. This board contains
several jumpers and connectors. S1 (VSET) allows selected output voltages to be programmed. S2 (TMR)
allows the charge timer to be configured. The R9 resistor allows a wide range of adjustment of VSET. R22 can
be used to change ISET value (fast charge current). R19 can be used to adjust TS, the battery temp sensor to
simulate hot and cold fault.
1.2 I/O Descriptions
Table 1-1 lists the input and output connections available on this EVM and their respective descriptions.
Table 1-1. EVM I/O Connections
I/O Connector Description
J1 – VIN / GND Input voltage from external power supply, recommended 5V. Max operating input
voltage is 6.6V, OVP trip point. Max input voltage is 30V while in OVP.
J2 – OUT (BAT+) / GND (BAT-) / GND / TS Battery connection, TS should be 10k NTC but not needed.
JP1 – VSET ADJ Disable R9, default is installed.
JP2 – REG / IN / OUT Source voltage for housekeeping regulator, U2. Default Input voltage IN.
JP3 – TMR Connection to TMR pin
JP4 – ISET Sets Fast Charge Current. Fixed=400mA ADJ= R22 range 60mA to 600mA
JP5 - STAT LED Default setting is ON.
JP6 – TS NTC temp sensor. Fixed=10k (safe) ADJ=R19 range from 0 to 50k ohms. Default Fixed.
JP7 - TMR ADJ Bypasses R18 for TMR connection to S2
JP8 Not used, do not install
JP9 Not used, do not install
Table 1-2 lists the S1 switch positions for VSET and their respective descriptions. Use only one postion ON, do
not combine.
Table 1-2. VSET S1 Switch Positions
Position / RX / Value NiMH Configuration
#1 / R1 / 27k ohm 2-Cell + Intermittent
#2 / R2 / 24k ohm 3-Cell
#3 / R3 / 18k ohm 3-Cell + Intermittent
#4 / R4 / 11k ohm 4-Cell + Intermittent
#5 / R5 / 6.2k ohm 5-Cell + Intermittent
#6 / R6 / 4.7k ohm 6-Cell
#7 / R7 / 3.6k ohm 6-Cell + Intermittent
#8 / R8 / 0 ohm Short Circuit – No Charge
Table 1-3. TMR S2 Switch Positions
Position / RX / Value Charge Timer (HR)
#11 / R11 / 36k ohm 4hr
#12 / R12 / 18.2k ohm 10hr
#13 / R13 / 6.2k ohm 18hr
#14 / R14 / 0 ohm 0hr (Short-Circuit)
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2 Test Summary
This section describes the jumpers and connectors on the EVM as well as how to properly connect, setup, and
use the BQ25172EVM.
2.1 Equipment
This section includes a list of supplies required to perform tests on this EVM.
1. Battery simulator such as Keithley 2400 or equilvalent. A real NiMH battery may also be used.
2. Power supply, 5V 1A input. Note that unit can operate up to 6.6V input.
3. Voltage meter and current meter.
2.2 Cautions
To prevent possible damage to battery under test verify that charging conditions of the cell are not exceeded.
Check max charge voltage and current.
Power dissipation of the device can be exceeded with too high an input to output voltage drop and current.
Thermal regulation begins reducing current at 125 °C, at 150 °C device will shut off.
Device can get hot during high input-to-output voltage drop and high current conditions. Use caution when
handling the board.
2.3 Test Instructions
In order for this EVM to operate properly, the following components must be connected and properly configured.
1. Set input power supply to 5V and Battery Simulator to 2.2V with compliance to support 800mA. Turn off
Supply and Battery Simulator.
2. Connect input voltages to J1 and Battery Simulator to J2 on the EVM.
3. Configure all EVM jumpers to factory setting, refer to table below.
4. Turn on all supplies and loads
a. 5V Input supply current limit should be greater than 500mA
b. Out voltage should be 2.2V and charge current 400mA
5. Simulate battery completing charge by increasing Battery Simulator voltage to 2.4V
a. Current will decrease to 0mA
Table 2-1. Jumper Factory Setting
I/O Connector Factory Setting
JP1 Installed
JP2 IN
JP3 Installed
JP4 Fixed
JP5 Installed
JP6 Fixed
JP7 N/A
JP8 N/A
JP9 N/A
S1 Position 1
S2 N/A
Note: IN, ON, Fixed are positions of a 3 pin header. If it is a 2 pin header then it is installed or not installed.
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3 Board Layout, Schematic, and Bill of Materials
3.1 Board Layout
The board layout is shown in Figure 3-1 to Figure 3-6.
Figure 3-1. Top Overlay
Figure 3-2. Top Solder
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Figure 3-3. Top Layer
Figure 3-4. Bottom Layer
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Figure 3-5. Bottom Solder
Figure 3-6. Bottom Overlay
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3.2 Schematic
The BQ25172EVM schematic is shown in Figure 3-7.
Figure 3-7. BQ25172EVM Schematic
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3.3 Bill of Materials
The bill of materials is shown in the following table.
Table 3-1. Bill of Materials
Designator Quantity Manufacturer Value Description Package
Reference Part Number Manufacturer Alternate Part Number1
Alternate
Manufacturer1
!PCB? 1 Any Printed Circuit Board BMS033 Any
C1, C3 2 MuRata 1uF CAP, CERM, 1 µF, 50
V,+/- 20%, X5R, AEC-
Q200 Grade 3, 0603
0603 GRT188R61H105ME13D MuRata
C2, C4 2 MuRata 1uF CAP, CERM, 1 uF, 16
V, +/- 10%, X7R, AEC-
Q200 Grade 1, 0603
0603 GCM188R71C105KA64D MuRata
D2 1 Lite-On Green LED, Green, SMD Body1.6x0.8mm LTST-C193TGKT-5A Lite-On
H1, H2, H3,
H4
4 3M Bumpon, Hemisphere,
0.44 X 0.20, Clear
Transparent
Bumpon
SJ-5303 (CLEAR) 3M
J1 1 On-Shore
Technology
Terminal Block, 3.5mm
Pitch, 2x1, TH
7.0x8.2x6.5mm ED555/2DS On-Shore
Technology
J2 1 On-Shore
Technology
Terminal Block, 3.5mm
Pitch, 4x1, TH
14x8.2x6.5mm ED555/4DS On-Shore
Technology
JP1, JP3,
JP5, JP7
4 Sullins Connector
Solutions
Header, 100mil, 2x1,
Tin, TH
Header, 2 PIN,
100mil, Tin
PEC02SAAN Sullins Connector
Solutions
JP2, JP4, JP6 3 Sullins Connector
Solutions
Header, 100mil, 3x1,
Tin, TH
Header, 3 PIN,
100mil, Tin
PEC03SAAN Sullins Connector
Solutions
LBL1 1 Brady Thermal Transfer
Printable Labels,
0.650" W x 0.200" H -
10,000 per roll
PCB Label 0.650 x
0.200 inch
THT-14-423-10 Brady
R1 1 Yageo 27.0k RES, 27.0 k, 1%, 0.1
W, 0603
0603 RC0603FR-0727KL Yageo
R2 1 Yageo 24.0k RES, 24.0 k, 1%, 0.1
W, 0603
0603 RC0603FR-0724KL Yageo
R3 1 Yageo 18.0k RES, 18.0 k, 1%, 0.1
W, 0603
0603 RC0603FR-0718KL Yageo
R4 1 Yageo 11.0k RES, 11.0 k, 1%, 0.1
W, 0603
0603 RC0603FR-0711KL Yageo
R5, R13 2 Yageo 6.20k RES, 6.20 k, 1%, 0.1
W, 0603
0603 RC0603FR-076K2L Yageo
R6 1 Yageo 4.70k RES, 4.70 k, 1%, 0.1
W, 0603
0603 RC0603FR-074K7L Yageo
R7 1 Yageo 3.60k RES, 3.60 k, 1%, 0.1
W, 0603
0603 RC0603FR-073K6L Yageo
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Table 3-1. Bill of Materials (continued)
Designator Quantity Manufacturer Value Description Package
Reference Part Number Manufacturer Alternate Part Number1
Alternate
Manufacturer1
R8, R14 2 Yageo 0 RES, 0, 5%, 0.1 W,
0603
0603 RC0603JR-070RL Yageo
R9, R18 2 Bourns 50k Ohm Trimmer
Potentiometer, Lead
Sealed Type Multiturn
PV37 Series, TH
6.71x4.5mm PV37W503C01B00 Bourns
R10 1 Yageo 750 RES, 750, 1%, 0.1 W,
0603
0603 RC0603FR-07750RL Yageo
R11 1 Yageo 36.0k RES, 36.0 k, 1%, 0.1
W, 0603
0603 RC0603FR-0736KL Yageo
R12 1 Yageo 18.2k RES, 18.2 k, 1%, 0.1
W, 0603
0603 RC0603FR-0718K2L Yageo
R19, R22 2 Bourns 20k Trimmer, 20k ohm,
0.25W, TH
4.5x8x6.7mm 3266W-1-203LF Bourns
R20 1 Vishay-Dale 10.0k RES, 10.0 k, 1%, 0.1
W, AEC-Q200 Grade
0, 0603
0603 CRCW060310K0FKEA Vishay-Dale
R21 1 Vishay-Dale 301 RES, 301, 1%, 0.1 W,
AEC-Q200 Grade 0,
0603
0603 CRCW0603301RFKEA Vishay-Dale
R24 1 Yageo 1.00k RES, 1.00 k, 1%, 0.1
W, 0603
0603 RC0603FR-071KL Yageo
S1 1 Grayhill Switch, SPST 8Pos,
Rocker, TH
9.65X8X22.4mm 76SB08ST Grayhill
S2 1 Grayhill DIP Switch, SPST
4Pos, Slide, TH
DIP Switch, 4 Pos 78B04ST Grayhill
SH-JP1, SH-
JP2, SH-JP3,
SH-JP4, SH-
JP5, SH-JP6,
SH-JP7
7 Samtec 1x2 Shunt, 100mil, Gold
plated, Black
Shunt SNT-100-BK-G Samtec 969102-0000-
DA
3M
TP1, TP2,
TP3, TP4,
TP5, TP6,
TP7, TP8,
TP9, TP10,
TP12, TP13,
TP14
13 Harwin Test Lead clips and
hooks, SMT
Test Point, Body
3.25x1.65mm
S1751-46 Harwin
U1 1 Texas Instruments BQ25172DSG WSON8 BQ25172DSG Texas
Instruments
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Table 3-1. Bill of Materials (continued)
Designator Quantity Manufacturer Value Description Package
Reference Part Number Manufacturer Alternate Part Number1
Alternate
Manufacturer1
U2 1 Texas Instruments Automotive 150-mA
high-voltage ultra-low-
IQ low-dropout (LDO)
linear regulator,
DRV0006A (WSON-6)
DRV0006A TPS7B8133QDRVRQ1 Texas
Instruments
Texas
Instruments
C5 0 AVX 100pF CAP, CERM, 100 pF,
50 V, +/- 1%, C0G/
NP0, 0402
0402 04025A101FAT2A AVX
C6 0 MuRata 1uF CAP, CERM, 1 µF, 50
V,+/- 20%, X5R, AEC-
Q200 Grade 3, 0603
0603 GRT188R61H105ME13D MuRata
C7 0 MuRata 1uF CAP, CERM, 1 uF, 16
V, +/- 10%, X7R, AEC-
Q200 Grade 1, 0603
0603 GCM188R71C105KA64D MuRata
C8 0 MuRata 4700pF CAP, CERM, 4700 pF,
50 V, +/- 10%, X5R,
0603
0603 GRM188R61H472KA01D MuRata
D1 0 Lite-On Green LED, Green, SMD Body1.6x0.8mm LTST-C193TGKT-5A Lite-On
FID1, FID2,
FID3
0 N/A Fiducial mark. There
is nothing to buy or
mount.
N/A N/A N/A
JP8, JP9 0 Sullins Connector
Solutions
Header, 100mil, 3x1,
Tin, TH
Header, 3 PIN,
100mil, Tin
PEC03SAAN Sullins Connector
Solutions
R15, R17 0 Yageo America 604k RES, 604 k, 0.1%,
0.125 W, 0805
0805 RT0805BRD07604KL Yageo America
R16 0 Bourns 500 kOhms 0.25W,
1/4W PC Pins
Through Hole Trimmer
Potentiometer Cermet
12 Turn Top
Adjustment
PTH_3 PV37W504C01B00 Bourns
R23 0 Yageo 1.00k RES, 1.00 k, 1%, 0.1
W, 0603
0603 RC0603FR-071KL Yageo
R25 0 Vishay-Dale 10.0k RES, 10.0 k, 1%, 0.1
W, AEC-Q200 Grade
0, 0603
0603 CRCW060310K0FKEA Vishay-Dale
R26 0 Vishay-Dale 2.00k RES, 2.00 k, 1%, 0.1
W, AEC-Q200 Grade
0, 0603
0603 CRCW06032K00FKEA Vishay-Dale
SH-JP8, SH-
JP9
0 Samtec 1x2 Shunt, 100mil, Gold
plated, Black
Shunt SNT-100-BK-G Samtec 969102-0000-
DA
3M
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