DEMO MANUAL DC101
SMART BATTERY CHARGER
LT1511 Level 2, Smart
Battery Charger Demo Board
with SMBus Interface
U
DESCRIPTIO
The DC101 board is a standalone Smart Battery charger
that receives Charging Voltage(), Charging Current() and
AlarmWarning() commands from the Smart Battery via
the System Management Bus (SMBus) and sets charging
current and voltage accordingly. The charger continu-
ously monitors the built-in thermistor in the battery. The
thermistor information is used by the software to inhibit
charging at temperature extremes and to set charging
strategy for different battery chemistries.
, LTC and LT are registered trademarks of Linear Technology Corporation.
W U
WW
PERFOR A CE SU ARY
PARAMETER
CONDITIONS
MIN
TYP
MAX
27
UNIT
Input Voltage
16
24
V
A
A
V
Input Current
Hardware Limited
Software Limited
Software Limited
2
Output Current
Output Voltage
Thermistor Resistance
0
4
2.5
20
Ni-MH Battery
Li-Ion Battery
3
0.5
30
1.5
kΩ
kΩ
1
W U
BLOCK DIAGRA A D BOARD PHOTO
DC101 Smart Battery Charger
R10
SYSTEM CURRENT
+
–
DC OUT
GND
Component Side
5V
FROM
WALL
CUBE
5V
LT1129
SMB
µP
+
LT®1511
CHARGER
26
14
15
2
C SMBus
CLOCK (SCL)
PIC16C73
SHUTDOWN
D SMBus
DATA (SDA)
11
Q1
T THERMISTOR
VOLTAGE PWM
CURRENT PWM
13
12
–
Q2
BATTERY
CONNECTOR
Q3
DC101 BD
1
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DEMO MANUAL DC101
SMART BATTERY CHARGER
W
PACKAGE DIAGRA
TOP VIEW
GND
SW
1
2
3
4
5
6
7
8
9
24 GND
23 GND
BOOST
GND
GND
UV
22
21
20
V
CC1
V
CC2
V
CC3
19 PROG
18
17 UV
LT1511CSW
GND
OVP
V
C
OUT
CLP
16 GND
CLN 10
COMP1 11
SENSE 12
15 COMP2
14 BAT
13 SPIN
SW PACKAGE
24-LEAD PLASTIC SO WIDE
PARTS LIST
REFERENCE
DESIGNATOR
QUANTITY PART NUMBER
DESCRIPTION
VENDOR
AVX
TELEPHONE
(803) 946-0362
(207) 282-5111
(803) 946-0362
(803) 946-0362
(803) 946-0362
(803) 946-0362
(803) 946-0362
(847) 696-2000 x374
(803) 946-0362
(203) 268-6261
(800) 421-6815
(800) 421-6815
(602) 244-3576
(602) 244-3576
(717) 780-4409
(503) 643-4899
(818) 301-4200
(407) 241-7876
(602) 244-3576
(602) 244-4342
(803) 946-0524
(803) 946-0524
(803) 946-0524
C1, C8, C17, C19
4
2
1
2
1
1
1
4
2
1
1
1
2
2
1
1
1
1
3
1
3
1
2
12065C104KATMA
TAJB106M010
12063G334ZAT2
12063G105ZATMA
12065C473KAT
12063C153KAT2
12063G474ZAT2
THCS50E1E106Z
1206A330KAT2
VJ1206A101KXA
SF1-BR
0.1µF 50V Chip Capacitor
10µF 10V Tantalum Capacitor
0.33µF 25V Chip Capacitor
1µF 25V Chip Capacitor
0.047µF 50V 10% Chip Capacitor
0.015µF 25V 5% Chip Capacitor
0.47µF 25V Chip Capacitor
10µF 25V Ceramic Capacitor
33pF 50V Chip Capacitor
100pF 50V Chip Capacitor
Red LED
C2, C18
AVX
C3
AVX
C4, C5
AVX
C6
AVX
C7
AVX
C9
AVX
C10, C11, C12, C20
Marcon
AVX
C14, C15
C16
Vitramon
Data Display Product
Data Display Product
Motorola
Motorola
AMP
D1
D2
SF1-G
Green LED
D3, D5
D4, D6
J1
MBRS340T3
Diode
BAS16LT1
Diode
AMP-787441-1
CUI-PJ-002A
3801S-12-G1
CTX20-4
Connector
J2
Connector
Cui-Stack
Comm Con Conn.
Coiltronics
Motorola
Motorola
AVX
JPR1
L1
12-Pin Header Jumper
20µH Inductor
Q1,Q2, Q3
Q4
2N7002LT
N-Channel MOSFET
NPN Transistor
MMBT3904LT1
CR32-3321F-T
CR32-3010F-T
CR32-1001F-T
R1, R4, R16
R2
3.32k 1/8W 1% Resistor
301Ω 1/8W 1% Resistor
1k 1/8W 1% Resistor
AVX
R3, R18
AVX
3
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DEMO MANUAL DC101
SMART BATTERY CHARGER
PARTS LIST
REFERENCE
DESIGNATOR
QUANTITY PART NUMBER
DESCRIPTION
VENDOR
AVX
TELEPHONE
(803) 946-0524
(714) 447-2345
(512) 992-7900
(803) 946-0524
(512) 992-7900
(803) 946-0524
(512) 992-7900
(512) 992-7900
(512) 992-7900
(803) 946-0524
(803) 946-0524
(803) 946-0524
(803) 946-0524
(605) 665-9301
(617) 246-1007
(718) 956-8900
(602) 786-7200
(408) 432-1900
(408) 432-1900
(818) 301-4200
(310) 787-6300
R5, R6, R14
3
1
1
1
1
1
1
1
1
1
2
3
1
2
1
12
1
1
1
1
1
CR32-331J-T
330Ω 1/8W 5% Resistor
33.2k 1/8W 1% Resistor
0.033Ω 1/2W 5% Resistor
100k 1/8W 5% Resistor
0.05Ω 1/2W 5% Resistor
510Ω 1/8W 5% Resistor
100k 1/8W 0.1% Resistor
143k 1/10W 0.1% Resistor
21.5k 1/10W 0.1% Resistor
1.05k 1/8W 1% Resistor
200Ω 1/8W 1% Resistor
22k 1/10W 5% Resistor
22Ω 1/10W 5% Resistor
10k 1/8W 5% Resistor
PB Switch
R7
BCR1/8-3322F-T
LR2010-01-R033-J
CR32-104J-T
Beckman
IRC
R8
R9
AVX
R10
LR2010-01-R050-J
CR32-511J-T
IRC
R11
AVX
R12
W1206R-03-1003-B
W1206R-03-1433-B
W1206R-03-2152-B
CR32-1051F-T
CR32-2000F-T
CR32-223J-T
IRC
R13
IRC
R15
IRC
R17
AVX
R19, R20
AVX
R21, R22, R25
AVX
R23
CR32-220J-T
AVX
R24, R26
CR1206-103J
MJTP1230
Dale
S1
MORS-ASC
Keystone
Microchip
LTC
TP1 to TP5, E1 to E7
1502-2
Turret Testpoint
U1
U2
U3
XU1
Y1
PIC16C73-20SP
LT1511
Microcontroller IC
Battery Charger IC
LT1129IST-5
Voltage Regulator IC
Sockets IC
LTC
7167-14-G2
Comm Con
Epson (USA)
MA-505-4.00M-C2
4MHz Crystal
U
OPERATIO
Input Voltage: The nominal input voltage of the board is
24V DC. The input voltage must be higher than the battery
voltage by a minimum of 3V. The minimum input voltage
is 16V, limited by the undervoltage lockout circuit in the
LT1511 and set by resistors R16, R17 and R18. The
highest input voltage is 27.4V, limited by the maximum
input voltage of the LT1511. The input is protected against
reverse polarity up to 30V.
Red LED: A red LED indicates SMBus activity. It lights up
for about 1 second when the charger recognizes its own
address (12 hex) on the SMBus.
Green LED: A flashing green LED indicates microproces-
sor activity and charger status. Fast blinking (approxi-
mately 8Hz) indicates normal microprocessor activity and
either trickle charge or shutdown charger status. After
valid voltage and current data have been received, the
blinking speed of the LED slows down to about 2Hz,
indicating normal charging.
Input Current: The sum of the system current and the
chargerinputcurrentislimitedbytheLT1511to2A. When
both the system current and the charger input current
requirements are high, the charger reduces the charging
current to meet the 2A current limit.
4
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DEMO MANUAL DC101
SMART BATTERY CHARGER
U
OPERATIO
Battery Removal, Thermistor Measurements: The
charger periodically checks the thermistor in the battery
through the T-terminal. When the thermistor is out of
normaloperatingtemperaturerange,thechargerswitches
to trickle charge mode and increases the flashing fre-
quency of the green LED to indicate an abnormal charg-
ing condition. When the resistance of the thermistor is in
the 500Ω < RTH < 1.5k range, the charger assumes a Li-
Ion battery is at the output. Instead of trickle charging the
battery it shuts down the charger until a valid voltage and
current request arrives from the battery. An open ther-
mistor forces the charger into trickle charge mode and
the charger disregards data on the SMBus.
START
address (12 hex)
Charging Current() command code (14 hex),
current_LSB
current_MSB,
address (12 hex)
Charging Voltage() command code (15 hex)
voltage_LSB
voltage_MSB
STOP
The idealized SMBus waveforms shown in Figure 1 illus-
trate SMBus communication between the battery and the
charger. The first seven bits after the START sequence are
the battery address. The R/W bit tells the charger that the
battery is attempting to write to the charger. During the
acknowledge period (ACK), the charger becomes active
and pulls the data line (SDA) low, indicating reception of
a data word. When reception of the data word is not
acknowledged by the charger, the battery terminates the
communication by sending a STOP sequence to the bus.
The clock pulses for the communication are always gen-
erated by the battery (BUS MASTER).
System Management Bus (SMBus)
When charge in the Smart Battery (SB) drops below 85%
of the nominal capacity, it initiates communication over
the SMBus every 64 seconds. After sending a START
sequence,thebatteryaddressestheSmartBatterycharger
and waits for an acknowledgment (ACK) from it. If the
charger fails to acknowledge the word, the battery termi-
nates further communication by placing a STOP sequence
onto the SMBus. If the charger acknowledges (ACK) the
reception of the first word, the battery continues the
communication sequence and sends six more words to
the charger. The complete current and voltage request
communication sequence is as follows:
“C” Source Code
The latest version of “C” language source code, header
file, code file and hex dump file is provided on a 3.5" disk.
SDA
SCLK
0
0
0
1
0
0
2
1
R/W
ACK
DC101 F01
START
1
0 = WRITE
1 = 1ST NIBBLE
2 = 2ND NIBBLE (TRUNCATED)
THIS EXAMPLE = 12(H)
Figure 1. SMBus Waveforms Indicating Battery Address
5
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DEMO MANUAL DC101
SMART BATTERY CHARGER
U
OPERATIO
INIT VARIABLES
START
INTERRUPT
Y
Y
Y
Y
Y
THERMISTOR OPEN
TURN RED LED ON
FOR 2 SEC
Y
Y
Y
Y
Y
Y
DISABLE INTERRUPTS
12C DATA RECEIVED
RESET 12C POINTER
PUT 12C DATA ON THE
12C STACK INCREMENT
POINTER
THERMISTOR TOO HOT
A/D COUNTER = 0
MEASURE THERMISTOR
ENABLE INTERRUPTS
THERMISTOR
IN RANGE
SET ERROR FLAG
SHUT DOWN CHARGER
ERASE COMMAND
ALARM WARNING
ON STACK
RETURN FROM
INTERRUPT
THERMISTOR
TOO COLD
LOAD IPWM
ERASE COMMAND
ENABLE CHARGER
ERASE ERROR FLAG
CHARGING CURRENT
ON STACK
Li-Ion
LOAD VPWM
ERASE COMMAND
ENABLE CHARGER
ERASE ERROR FLAG
CHARGING VOLTAGE
ON STACK
THERMISTOR
SHORTED
ERROR FLAG
SET FAST BLINKING
SET TRICKLE CHARGE
SET ERROR FLAG
SET SLOW BLINKING
IF NO Li-Ion FLAG:
INIT Li-Ion MODE
ERASE ERROR FLAG
IF Li-Ion FLAG SET:
ERASE Li-Ion FLAG
ERASE ERROR FLAG
INIT Ni-MH MODE
Figure 2. Software Flowchart
6
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DEMO MANUAL DC101
SMART BATTERY CHARGER
U
W
PCB LAYOUT A D FIL
Component Side Silkscreen
Component Side Solder Mask
Component Side
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of circuits as described herein will not infringe on existing patent rights.
7
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DEMO MANUAL DC101
SMART BATTERY CHARGER
U
W
PCB LAYOUT A D FIL
Solder Side Solder Mask
Solder Side
U
PC FAB DRAWI G
NUMBER
OF HOLES
H
A
H
SYMBOL DIAMETER
H
A
B
C
D
E
125
120
100
94
4
2
1
12
14
4
40
55
132
G
G
A
H
E
D
0.150"
H
G
40
H
E
F
39
B
B
H
G
H
37
18
H
3.019"
H
TOTAL HOLES
H
H
C
NOTES
1. MATERIAL: 2 LAYERS, 0.062" THICK.
FR-4 GLASS EPOXY 2 OZ COPPER CLAD
2. ALL HOLES SHALL BE PLATED THROUGH
3. PLATE THROUGH HOLES WITH COPPER
0.0014 MIN THICKNESS. ALL HOLE SIZES
IN HOLE TABLE ARE AFTER PLATING
4. SILKSCREEN: WITH WHITE EPOXY
NONCONDUCTIVE INK
H
D
D
0.150"
0.219"
F
E
A
A
5. FINISH: SMOBC
6. SOLDER MASK: USE FILM PROVIDED, GREEN
DC101 FD
0.150"
0.150"
2.744"
3.900"
LT/GP 0796 500 • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
8
●
●
(408) 432-1900 FAX: (408) 434-0507 TELEX: 499-3977
LINEAR TECHNOLOGY CORPORATION 1996
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