DS1633 High-Speed Battery Recharger ASSIGNMENT TO-220 Rechar

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DS1633 High-Speed Battery Recharger ASSIGNMENT TO-220 Rechar

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DS1633
DS1633 High-Speed Battery Recharger
ASSIGNMENT TO-220
Recharges Lithium, NiCad, NiMH Lead acid batteries
Retains battery power supply limits onboard
memory
Serial 1-wire interface used program operating
limits
3-pin TO-220 package Operating range 70°C Applications include consumer electronics, portable/
cellular phones, pagers, medical instruments, backup memory systems, security systems
Configurable operate with supplies
DESCRIPTION
VBAT Supply Voltage Battery Output Ground
DESCRIPTION
DS1633 Battery Recharger designed complete battery charging system standard charge trickle charge applications. configured used with either supplies battery voltages high 4.7V (3.7V supplies). device flexible enough used with variety battery chemistries celI capacities. provides timer termination standard charge automatically shifts into trickle charge. Battery voltage monitored charging terminated exceeds preset maximum safety feature. output load line specified usual constant current recharge with voltage limit configured approximate practical load line. parameters, such power supply range, charge current load line, trickle charge rate, timer setting, programmed into nonvolatile memory using battery 1-wire communication port. ease task configuring device specific application needs, Dallas Semiconductor makes available programming kit, DS1633K, containing easy-to-use software hardware personal computers.
ECopyright 1995 Dallas Semiconductor Corporation. Rights Reserved. important information regarding patents other intellectual property rights, please refer Dallas Semiconductor databooks.
052694 1/11
DS1633
DS1633 able offer this flexibility unique architecture (see Figure device monitors battery voltage adjusts values output impedance (RTH) open circuit voltage (VOC) presents battery. These values adjusted user definable points (breakpoints) that occur roughly every 37mV. This allows device approximate wide range charging lines; limited constant current even monotonically decreasing functions.
select system power supply level 6V), timer option, time limit hours 2-hour increments).
BREAKPOINT REGISTER STRUCTURE Break Point Voltage Field
break point voltage field specifies range battery voltage over which RTH, pulse frequency information contained that register valid. This information valid when battery voltage meets exceeds breakpoint value, less than next breakpoint value: VBPX VBAT VBP(x+1) breakpoint voltage (VBPX) determined according following formula: VBPX(n) (n/127)(4.699V) value entered field 7-bit binary value, first. reliable operation first (x=0) breakpoint should programmed such that VBP0 Successive breakpoints should programmed with increasing values, that VBPX VBP(x+1) available breakpoints used, unused points should assigned maximum value (n=127) 4.699V with their maximum values (5060 5.5V) duty cycle field minimum zero value.
OPERATION Normal Mode
Upon application power, DS1633 will perform initialization cycle requiring eight seconds. During this period will determine battery connected battery input applying voltage through output impedance looking non-zero current flow pin. battery connected, value battery voltage will determined using 7-bit convertor. This value will used determine which user-defined breakpoints should used VOC. Generally, battery charges battery voltage will increase. When battery voltage reaches exceeds each user-defined breakpoint, values will modified accordingly. battery voltage measured adjustments made every eight seconds. battery detection performed one-second intervals. amount time battery been charging exceeds preset limit, device will apply before, only fraction eight-second cycle time. This duty cycle 1/64 high this trickle charge accomplished time averaging short pulse over longer period. Refer Figure detailed flow diagram normal operation.
OPEN CIRCUIT VOLTAGE FIELD
open circuit voltage field specifies value applied battery. values between 1.3V 5.5V. This field entered 7-bit binary value, first. value VOC(n) determined follows: VOC(n) 1.3V n(5.5V 1.3V)/127 reliable operation battery detection circuitry, minimum value should greater than maximum battery voltage.
PROGRAMMING MODE Register Structure
configure DS1633 operate with unique load line user must program 25-bit internal registers (Table first (0-31) these registers contain information needed locate each breakpoint what that breakpoint, well duty cycle used after optional timer expired. last (32) register contains bits which
052694 2/11
DS1633
THEVENIN RESISTANCE FIELD
Thevenin resistance field specifies value output resistance between impedance source battery pin. This resistance have values ranging from 5060 with difference successive values. This field entered 7-bit binary value, first. value RTH(n) determined follows: RTH(n) 7.5(0.95n-127)
indicates system charging will begin when exceeds 4.75V.
TIMER STATUS FIELD
This field which indicates timer used. this field indicates that timer used, zero that not.
TIMER VALUE FIELD
This field specifies maximum time (TMAX) standard non-pulsed charging. During period when timer expired, will applied battery input charge one. When elapsed charge time exceeds value this register, will applied duty cycle determined field each breakpoint. field entered 4-bit binary value, first. timer have values from hours, determined following: TMAX(n)
PULSE WIDTH FIELD
pulse width field specifies amount time (PW) during each eight second charging evaluation cycle that will applied after optional timer expired. have values ranging from seconds field entered 3-bit binary value, first. value determined follows: PW(n) 2n/16 PW(n)
PROGRAMMING OPERATION
data registers stored nonvolatile memory written only once. registers must programmed before read. Note that although configuration register contains only bits, bits required entered; therefore, fill with 0's. registers programmed sequentially, starting register each register programmed, internal pointer moves next register until have been programmed. enter program/read mode, must taken minimum returned VBAT configured operate single wire line. hardware interface shown Figure
CHARGE FIELD
This field which specifies this breakpoint applied case unexpired timer. usefulness permitting certain breakpoints turned battery voltage exceeds maximum during standard charge. timer expired used, this accomplished those breakpoints using pulse width bits 000). this field means that applied when breakpoint current one.
CONFIGURATION REGISTER STRUCTURE VTRIP Field
This one-bit field which specifies valid supply voltage device. this field indicates system being used part will begin charging until applied exceeds 5.7V. Conversely, zero
RESET TIMING
issue reset device VBAT must brought held minimum after which released will return high level through internal pullup resistor. After line allowed return high must pulled least Refer Figure
052694 3/11
DS1633
WRITE TIMING
logic written bringing VBAT least more than logic written bringing VBAT least more than After line allowed return high must pulled least Refer Figure
READ TIMING
read performed bringing VBAT least more than then releasing logic indicated returning high. state VBAT should sampled most after VBAT pulled low. high level indicates read `1', level indicates read `0'.
according write cycle timing detailed above, from MSB. commit data nonvolatile memory VBAT brought 12V, with least When VBAT released returns reset cycle issued device ready next register. careful issue multiple resets this will move pointer. This sequence repeated until registers programmed. When registers have been programmed, DS1633 disables serial interface begins normal operation.
VERIFICATION
verify data contained registers single line must enabled bringing least Unlike programming operation, read operation allows random access registers. read cycle preceded logic ones, 6-bit register address, entered first, logic ones. device will output contents register, first, next read cycles. read another register, issue reset repeat sequence.
PROGRAMMING
program DS1633 single line must enabled bringing least then back first register written. register data must preceded consecutive logic write cycles. register data entered
052694 4/11
DS1633
SIMPLIFIED BLOCK DIAGRAM Figure
OPEN CIRCUIT VOLTAGE (VOC) BANDGAP REFERENCE BATTERY OUTPUT RESISTANCE (RTH)
NONVOLATILE MEMORY
7-BIT CONVERTOR
DS1633 REGISTER STRUCTURE Table
REGISTER CO31 PW31 RTH31 VOC31
TIMER VALUE
DS1633 MEMORY ARRAY CHARGE PULSE WIDTH THEVENIN RESISTANCE FIELD RTH0 OPEN CIRCUIT VOLTAGE VOC0 BREAKPOINT VOLTAGE VBP0
VBP31
TIMER STATUS VTRIP
MUST FILL UNUSED BITS WITH
052694 5/11
DS1633
DS1633 OPERATION FLOW CHART Figure
POWER DOWN CHARGING BATTERY BACKUP
POWER
FIRST PASS SECOND SETUP FIND INITIAL CHARGING POINT CHARGE CURRENT 1/SEC
1/SEC
CHARGE
FORCE CHARGE
TIMER EXPIRED
TIMER MODE
RESET TIMER
SAMPLES OVER MSEC
CHARGE WITH PULSE FREQ CHARGE DUTY CYCLE WITH PULSE FREQ (2:0)
SAMPLES INDICATE BATTERY
WITH CURRENT LOAD LINE DATA LAST MSEC SECONDS READ EPROM DATA
STILL FIRST PASS
LATCH DATA
VBAT>VBP
DECREMENT ADDRESS
ADDRESS
052694 6/11
DS1633
HARDWARE INTERFACE PROGRAMMING Figure
PROGRAM REGISTER
VBAT
DS1633
INTERFACE PROGRAMMING CIRCUITRY
SIGNAL TIMING Figure
CYCLE
tREC tREC
CYCLE
WRITE
VBAT
tREC tREC
WRITE
tREC tREC
READ
VBAT tREAD
tSAMPLE
RESET
VBAT
DATA VALID tREC 052694 7/11
DS1633
REGISTER VALUE CROSS REFERENCE Table
5.060E+03 4.807E+03 4.567E+03 4.338E+03 4.122E+03 3.915E+03 3.720E+03 3.534E+03 3.357E+03 3.189E+03 3.030E+03 2.878E+03 2.734E+03 2.598E+03 2.468E+03 2.344E+03 2.227E+03 2.116E+03 2.010E+03 1.909E+03 1.814E+03 1.723E+03 1.637E+03 1.555E+03 1.478E+03 1.404E+03 1.333E+03 1.267E+03 1.203E+03 1.143E+03 1.086E+03 1.032E+03 9.802E+02 9.312E+02 8.846E+02 8.404E+02 7.984E+02 7.585E+02 1.30 1.33 1.37 1.40 1.43 1.47 1.50 1.53 1.56 1.60 1.63 1.66 1.70 1.73 1.76 1.80 1.83 1.86 1.90 1.93 1.96 1.99 2.03 2.06 2.09 2.13 2.16 2.19 2.23 2.26 2.29 2.33 2.36 2.39 2.42 2.46 2.49 2.52 0.000 0.037 0.074 0.111 0.148 0.185 0.222 0.259 0.296 0.333 0.370 0.407 0.444 0.481 0.518 0.555 0.592 0.629 0.666 0.703 0.740 0.777 0.814 0.851 0.888 0.925 0.962 0.999 1.036 1.073 1.110 1.147 1.184 1.221 1.258 1.295 1.332 1.369 7.205E+02 6.845E+02 6.503E+02 6.178E+02 5.869E+02 5.575E+02 5.297E+02 5.032E+02 4.780E+02 4.541E+02 4.314E+02 4.098E+02 3.894E+02 3.699E+02 3.514E+02 3.338E+02 3.171E+02 3.013E+02 2.862E+02 2.719E+02 2.583E+02 2.454E+02 2.331E+02 2.215E+02 2.104E+02 1.999E+02 1.899E+02 1.804E+02 1.714E+02 1.628E+02 1.547E+02 1.469E+02 1.396E+02 1.326E+02 1.260E+02 1.197E+02 1.137E+02 1.080E+02 2.56 2.59 2.62 2.66 2.69 2.72 2.76 2.79 2.82 2.85 2.89 2.92 2.95 2.99 3.02 3.05 3.09 3.12 2.15 3.19 3.22 3.25 3.28 3.32 3.35 3.38 3.42 3.45 3.48 3.52 3.55 3.58 3.61 3.65 3.68 3.71 3.75 3.78 1.406 1.443 1.480 1.517 1.554 1.591 1.628 1.665 1.702 1.739 1.776 1.813 1.850 1.887 1.924 1.961 1.998 2.035 2.072 2.109 2.146 2.183 2.220 2.257 2.294 2.331 2.368 2.405 2.442 2.479 2.516 2.553 2.590 2.627 2.664 2.701 2.738 2.775
052694 8/11
DS1633
1.026E+02 9.747E+01 9.260E+01 8.797E+01 8.357E+01 7.939E+01 7.542E+01 7.165E+01 6.807E+01 6.467E+01 6.143E+01 5.836E+01 5.544E+01 5.267E+01 5.004E+01 4.753E+01 4.516E+01 4.290E+01 4.076E+01 3.873E+01 3.678E+01 3.494E+01 3.320E+01 3.154E+01 2.996E+01 2.846E+01
3.81 3.85 3.88 3.91 3.95 3.98 4.01 4.04 4.08 4.11 4.14 4.18 4.21 4.24 4.28 4.31 4.34 4.38 4.41 4.44 4.47 4.51 4.54 4.57 4.61 4.64
2.812 2.849 2.886 2.923 2.960 2.997 3.034 3.071 3.108 3.145 3.182 3.219 3.256 3.293 3.330 3.367 3.404 3.441 3.478 3.515 3.552 3.589 3.626 3.663 3.700 3.737
2.704E+01 2.569E+01 2.440E+01 2.318E+01 2.202E+01 2.092E+01 1.988E+01 1.888E+01 1.794E+01 1.704E+01 1.619E+01 1.538E+01 1.461E+01 1.388E+01 1.319E+01 1.253E+01 1.190E+01 1.131E+01 1.074E+01 1.020E+01 9.693E+00 9.208E+00 8.748E+00 8.310E+00 7.895E+00 7.500E+00
4.67 4.71 4.74 4.77 4.81 4.84 4.87 4.90 4.94 4.97 5.00 5.04 5.07 5.10 5.14 5.17 5.20 5.24 5.27 5.30 5.33 5.37 5.40 5.43 5.47 5.50
3.774 3.811 3.848 3.885 3.922 3.959 3.996 4.033 4.070 4.107 4.144 4.181 4.218 4.255 4.292 4.329 4.366 4.403 4.440 4.477 4.514 4.551 4.588 4.625 4.662 4.699
052694 9/11
DS1633
ABSOLUTE MAXIMUM RATINGS*
Voltage Relative Ground Operating Temperature Storage Temperature Soldering Temperature -1.0V +7.0V 70°C -55°C +125°C 260°C seconds
This stress rating only functional operation device these other conditions above those indicated operation sections this specification implied. Exposure absolute maximum rating conditions extended periods time affect reliability.
RECOMMENDED OPERATING CONDITIONS
PARAMETER Mode Supply Voltage, Operation Mode Supply Voltage, Operation Supply Voltage, VBAT, Programming IBAT, Programming Supply Voltage, Programming Logic Input Logic Input SYMBOL VCC1 VCC2 VBATP IBATP VCC3 -0.3 4.75 VCC+0.3 +0.8
(0°C 70°C)
UNITS NOTES 1,3,4
ELECTRICAL CHARACTERISTICS
PARAMETER Supply Current, Operation Mode Supply Current, Programming Mode Output Low, Voltage Output Low, Current VBAT Leakage Current with Pullup resistance Breakpoint Voltage (n=0) Breakpoint Voltage (n=127) Open Circuit Voltage (n=0) Open Circuit Voltage (n=127) Thevenin Resistance (n=0) Thevenin Resistance (n=127) Timer Value (n=0) Timer Value (n=15) SYMBOL ICC1,2 ICC3 IBAT VBP(0) VBP(127) VOC(0) VOC(127) RTH(0) RTH(127) TMAX(0) TMAX(127) 4933 28.8 5.45 4.649 4.699 5.50 5060
(0°C 70°C; VCC=5.75V)
UNITS NOTES
4.749 5.55 5187 35.2 hours hours
052694 10/11
DS1633
ELECTRICAL CHARACTERISTICS: DATA TRANSMISSION PARAMETERS
PARAMETER Reset Active Logic Active Logic Active Read Enable Time Time from Read Enable Line Sampling Data Transfer Window Active Signal Pulse Width, Data Recovery Time Between Windows Programming Pulse Width, VBAT SYMBOL tREAD tSAMPLE tREC tPRG UNITS NOTES
NOTES:
voltages referenced ground. operation conditions. operation conditions. VOCMAX 4.5V, VTRIP 5.7V operation) must used. High impedance isolation between VBAT with VCC=0 45G. Does include current supplied battery pin. 25°C, positive temperature coefficient approximately ppm/°C.
052694 11/11

DS1633 High-Speed Battery Recharger ASSIGNMENT TO-220 Rechar

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