features bq2002/t fast-charge control evaluation and development charge current sourced from an on-board linear regulator (up to 1.5a) fast charge of 4, 5, 6, 8, and 10 nicd or nimh cells (contact benchmarq for other cell counts) fast-charge termination by negative delta voltage (-?v) or peak voltage detect (bq2002) or ?t/?t (bq2002t) maximum temperature and maximum time safety terminations -? v/peak voltage detect, hold-off, top-off, maximum time, and number of cells are jumper-configurable inhibit fast charge by a logic-level input general description the dv2002l2/tl2 development system provides a de- velopment environment for the bq2002 and bq2002t fast-charge ics. the dv2002l2/tl2 incorporates a bq2002/t and a linear regulator to provide fast charge control for 4 to 10 nicd or nimh cells. the fast charge is terminated by any of the following: ? t/ ? t, maximum temperature, maximum time, or an in - hibit command for the bq2002t; or - ? v/peak voltage, maximum temperature, maximum time, and inhibit command for the bq2002. jumper settings select the top-off and maximum time limits. the user provides a power supply and batteries. the user configures the dv2002l2/tl2 for the number of cells and maximum charge time (with or without top- off). please review the bq2002t or bq2002 data sheet before using the dv2002l2/tl2 board. connection descriptions jp4 therm thermistor connection bat? battery ground bat+ positive battery terminal gnd ground from charger supply dc dc input from charger supply jp3 noc select number of cells jp2 inh inhibit input jp1 tm timer, etc. setting 1 dv2002l2/tl2 3/98 rev. c board fast charge development system control of lm317 linear regulator
fixed configuration the dv2002l2/tl2 board has the following fixed char - acteristics: v cc (4.75?5.25v) is regulated on-board from the supply at connector jp4 (dc:gnd). led indicates charge status. charge initiates on the later application of the battery or dc, which provides v cc to the bq2002/t. as shipped from benchmarq, the dv2002l2/tl2 linear regulator is configured to a charging current of 1.25a. this current level is controlled by the value of sense re- sistor r 7 by the relationship: i= 1.25v r chg 7 the value of r 7 at shipment is 1 ? . this resistor can be changed depending on the application. the suggested maximum i chg for the dv2002l2/tl2 board is 1.5a. u2 must be mounted to an appropri - ate heat sink. the maximum cell voltage (mcv) is scaled to 2v/cell. with the provided ntc thermistor connected between therm and bat?, tco = 50c. the thermistor is identified by the serial number suffix as follows: jumper-selectable configuration the dv2002l2/tl2 must be configured as described be - low. inh (jp2) : enables/disables charge inhibit (see bq2002/t data sheet). tm (jp1): selects fast charge safety time/top-off (see bq2002/t data sheet). number of cells (jp3) : a resistor-divider network is provided to select 4 to 10 cells (the resulting resistor value equal sn?1 cells). rb1 is a 100k ? resistor, and rb2 (rb20?rb25) is jumper-selected. temperature disable: connecting a 10k ? resistor be - tween therm and bat? disables temperature control. setup procedure 1. configure tm, inh, and number-of-cells (noc) jumpers. 2. connect the provided thermistor or a 10k ? resistor between therm and bat?. 3. attach the battery pack to bat+ and bat?. for temperature control, the thermistor must contact the cells. 4. attach dc current source to dc (+) and gnd (?) connections in jp4. 2 dv2002l2/tl2 rev. c board jumper setting pin state [ 1 2 ] 3 disabled (high) 1 [ 2 3 ] enabled (low) jumper setting pin state [ 1 2 ] 3 high 1 [ 2 3 ] low 1 2 3 float closed jumper number of cells r13 10 r12 8 r11 6 r10 5 r9 4 input voltage current resistance wattage to 25v 1a 1.25 ? 2w 1.5a 0.83 ? 2w table 1. lookup table for r7 selection identifier thermistor k1 keystone rl0703-5744-103-s1 (blank) philips 2322-640-63103 f1 fenwal type 16, 197-103la6-a01 o1 ozhumi 150-108-00(4) s1 semetic 103at-2
3 dv2002l2/tl2 rev. c board symbol description minimum typical maximum unit i dc maximum input current - - 1.5 a v dc maximum input voltage 4.0 + v bat or 10 - 18 + v bat or 25 v v bat bat input voltage - - 24 v v th therm input voltage 0.5 - 5 v dv2002l2/tl2 board schematic
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