Texas Instruments bq2014HEVM-001 User manual

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May 2001 Advanced Analog Products
User’s Guide
SLUU105

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Running Title—Attribute Reference
iii
Chapter Title—Attribute Reference
Contents
1 Introduction 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1 Features 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Kit Contents 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 Ordering Information 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 DM2014H—bq2014H-Based Circuit Module 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 Pin Descriptions 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Programming 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.1 Full Capacity 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.2 Self-Discharge Settings for Chemistry 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.3 Pack Voltage 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.4 Programming Hardware Changes 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 DM2014H Schematic 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 Schematic 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 DM2014H Physical Layouts 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1 Board Layout 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 DM2014H Bill of Materials 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1 Bill of Materials 5-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6 DM2014H Performance Specification Summary 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7 EVM Hardware and Software Setup 7-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.1 Software Installation 7-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.2 Hardware Connection 7-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.2.1 Connecting the DM2014H to a Battery Pack 7-2. . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.2.2 PC Interface Connection 7-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8 Operation 8-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.1 Starting the Program 8-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.2 Initialization 8-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.2.1 Device Program Settings 8-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.2.2 HDQ Port 8-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.2.3 Setup Parameters 8-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.3 Data Screen 8-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.4 Status Screen 8-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.5 Pro Screen 8-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.6 Data Logging 8-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Running Title—Attribute Reference
iv
Figures
3–1 DM2014H Schematic 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4–1 DM2014H Layout 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7–1 DM2014H Connection to Cells, Sense Resistor, and System Load/Charger 7-2. . . . . . . . . . .
8–1 Initial Data Screen 8-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8–2 Setup Screen 8-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8–3 bq2014H Data Screen 8-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8–4 Status Screen 8-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8–5 Pro Screen 8-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tables
1–1 Ordering Information 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–1 Full Capacity Programming 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–2 Self-Discharge Programming 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–3 Pack Voltage Programming 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5–1 Bill of Materials 5-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6–1 Performance Specification Summary 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7–1 DM2014H-to-EV2200 Connection 7-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8–1 Resistor Designations for Setup Screen Input 8-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1
Introduction
Introduction
The bq2014H EVM is a complete evaluation system for the bq2014H
gas-gauge IC for NiCd and NiMH. The EVM includes a DM2014H circuit
module, an EV2200 PC interface board for gas-gauge vvaluation, a PC serial
cable, and Windows-based PC software. The DM2014H circuit module
includes one bq2014H IC, five LEDs to display remaining capacity, and all
other components onboard necessary to monitor capacity and other critical
parameters in NiCd or NiMH battery packs. The DM2014H connects directly
across the cells in a battery. With the EV2200 interface board and software,
theusercanreadthebq2014Hdataregistersandevaluatethefunctionsofthe
bq2014H under different charge and discharge conditions.
Topic Page
1.1 Features 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Kit Contents 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 Ordering Information 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 1

Features
1-2
1.1 Features
-Complete evaluation system for the bq2014H gas-gauge IC
-Preprogrammed DM2014H module for quick setup
-PC software and interface board for easy evaluation
-Software that allows data logging for system analysis
1.2 Kit Contents
-DM2014H preconfigured circuit module with sense resistor
-EV2200 PC interface board
-Set of evaluation software disks entitled EV2200-HDQ
-PC serial cable
-Set of support documentation
1.3 Ordering Information
Table 1–1.Ordering Information
EVM Part Number Chemistry Pack Voltage Capacity
bq2014HEVM–001 NiCd/NiMH†12.0 V†650 mAh†
†Can be changed by reprogramming through resistor replacements.

2-1
DM2014H—bq2014H-Based Circuit Module
DM2014H—bq2014H-Based Circuit Module
The DM2014H circuit module is a complete and compact example solution of
a bq2014H circuit for capacity monitoring of NiCd or NiMH packs. The
DM2014H incorporates a bq2014H gas-gauge IC and all other components
necessary to accurately monitor and display the capacity of up to 14 nickel
cells.
TheDM2014H includes five LEDsto display remaining capacityin 20% incre-
ments of the programmed capacity. The LEDs are activated with the onboard
pushbutton switch.
Contacts on the DM2014H provide direct connection to the battery stack
(BAT+, BAT–) and the serial communications port (HDQ). The system load
and charger connect across BAT+ and PACK–.
Topic Page
2.1 Pin Descriptions 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Programming 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 2

Pin Descriptions
2-2
2.1 Pin Descriptions
P1 HDQ/Serial communications port
P2 NC/No connect
P3 BAT+/Battery positive/pack positive
P4 NC/No connect
P5 RBI/Register backup input
P6 GND/Ground
P7 PACK–/Pack negative
P8 BAT–/Battery negative
2.2 Programming
The DM2014H circuit module is preconfigured for battery-pack chemistry,
voltage,andpackcapacity.Thecircuitmodulecanbereprogrammed forpack
chemistry, voltage, capacity, and other operating parameters via the
programming resistors on the board. The resistors set the programming pins
to a high (H), low (L), or float (Z) state on initialization. A high (H) state for a
programming pin requires the pullup resistor, a low (L) state requires the
pulldown resistor, and the float (Z) requires no resistors on the programming
pin. The shaded area of the tables indicates the bq2014HEVM-001
configuration. See the bq2014H data sheet for a complete description of how
the bq2014H is programmed.
2.2.1 Full Capacity
Pins2–5 of the bq2014H determine the full capacity or programmed full count
(PFC)oftheDM2014H.ResistorsR12–R15andR17–20setthepinstoahigh
(H), low (L), or float (Z) state during board initialization.
Table 2–1.Full Capacity Programming
PFC Input Settings
Pin 4 Pin 5 Sense Resistor mΩCapacity (mAh)
H Z 50 1300
Z Z 50 650
L L 50 2600
2.2.2 Self-Discharge Settings for Chemistry
Battery chemistries have different self-discharge rates. Pin 6 of the bq2014H
determines the self-discharge factors of the DM2014H. Resistors R23 and
R24setthepintoahigh(H),low(L),orfloat(Z)stateduringboardinitialization.

Programming
2-3
DM2014H—bq2014H-Based Circuit Module
Table 2–2.Self-Discharge Programming
Self-Discharge Setting
Pin 6 Chemistry
HSelf-discharge disabled
Z NiCd
L NiMH
Note: Select the self-discharge setting that most closely models the battery pack to be used.
2.2.3 Pack Voltage
TheDM2014Hispreconfiguredforpackvoltage(numberofcells).R2,R6,and
R7configurethisasshownintheschematicandaresetasshowninTable2–3.
Table 2–3.Pack Voltage Programming
EVM Part Number R2 R18 R19 End-of-Discharge
Level 1 End-of-Discharge Level 2
bq2014HEVM-001 1.2 MΩ1.2 MΩ100 K 10 V 9.5 V
2.2.4 Programming Hardware Changes
The following procedure changes the configuration of DM2014H to other
(unshaded) options listed in the tables above:
1) Ensure that the DM2014H is disconnected from the battery.
2) Determine the resistors required to achieve the high (H), low (L), or float
(Z) states on the program pin inputs.
3) Remove the 200k resistors as necessary.
4) Place required 200k resistors where needed.
5) If required, change the voltage programming resistors as outlined on the
schematic.
6) Reconnect the DM2014H to the battery pack.
TheEV2200andthePCsoftwarecanconfirmthenewsettingsbyreadingthe
PPU and PPD data registers and the Setup screen.

2-4