mitsumi remaining battery power display mm1251, 1252, 1253 remaining battery power display monolithic ic mm1251, 1252, 1253 this ic detects battery voltage and displays the power remaining in the battery. display of the battery's remaining power is an indispensable function for portable equipment. the use of this ic makes this display easily achievable. the usual method of display of remaining battery power, as in the mm1206, is three marks lighting up in sequence on an led or other display. this ic, however, uses only one light to display the remaining battery power, resulting in lower cost. outline features 1. adjustable flashing speed 2. adjustable detection voltage supports all settings 3. adjustable hysteresis voltage enables response to large ripple settings 4. high precision voltage detection (mm1253) enables support of sets using nickel cadmium and other batteries 5. the led can be lit up by the voltage from one battery (type of special built-in step-up circuit : rank b) package sop-8d (mm1251af, MM1251BF, mm1252af, mm1252bf, mm1253af) series description display pattern normal low power detection precision mm1251 light off flashing ?0mv mm1252 light on flashing ?0mv mm1253 light off flashing ?mv absolute maximum ratings (ta=25 c) item rating unit storage temperature - 40~+125 c operating temperature - 20~+70 c input voltage - 0.3~+3 v output terminal applied voltage - 0.3~+7 v allowable loss 300 mw products to be discontinued
mitsumi remaining battery power display mm1251, 1252, 1253 electrical characteristics (unless otherwise specified ta=25 c, vc=1.5v, vs=0.8v) (applicable to all models when the model name is left blank.) item symbol measurement conditions min. typ. max. unit v s =1.0v mm1251 25 40 ? current consumption 1 i cc 1 mm1253a v ct =0.4v mm1252a 0.15 0.25 ma mm1252b 0.75 0.1 ma mm1251a 0.15 0.25 ma current consumption 2 i cc 2v s =0.8v, v ct =0.4v mm1253a mm1251b 25 40 ? v s =1v 0.5v mm1251 0.82 0.85 0.88 v detection voltage vd v hys < = 0.1v mm1252 mm1253 0.841 0.85 0.859 v detection voltage temperature factor v/ t ?00 ppm/ c hys pin saturation voltage 1 v hys 1i hys =5? 25 50 mv hys pin saturation voltage 2 v hys 2i hys =25? 50 100 mv c t pin charge current i cts v ct =0.1v - 60 - 40 - 20 na c t pin discharge current i cto v ct =0.4v 20 40 60 na c t pin threshold value h v cth v ct =0.1 0.4, v o < = 0.1v 0.2 0.3 0.4 v c t pin threshold value l v ctl v ct =0.4 0.1, v o > = 0.1v 0.1 0.2 0.3 v output sink current i out v cr =0.4v 5 10 ma output saturation voltage i out lv ct =0.4, i out =1ma 100 150 mv output leak current i le v s =1v, v out =5v 1 ? operating limit voltage v opr v s =0.8 v cc v out > 0.4v rank a 0.65 0.75 v v s =0.8 v cc step-up operation limit voltage v opl v cc =0.1v 0.5v rank b 0.85 0.95 v voltage limit for maintaining led flashing products to be discontinued
mitsumi remaining battery power display mm1251, 1252, 1253 mm1251a /mm1253a application circuit timing chart unsettled v cc ct out vd note: the flashing region varies according to the vf value of the led. we recommend using leds with a low vf value. or, if necessary, insert a current limiting resistor. products to be discontinued
mitsumi remaining battery power display mm1251, 1252, 1253 mm1251b application circuit timing chart unsettled v cc c t vd out products to be discontinued
mitsumi remaining battery power display mm1251, 1252, 1253 mm1252a application circuit timing chart unsettled v cc ct vd out products to be discontinued
mitsumi remaining battery power display mm1251, 1252, 1253 step-up (rank b) type inductor values this circuit allows step-up for led lighting even when low only. the led repeats on/off at high frequency, but to the human eye it appears as if the led is lit. therefore, we do not recommend the use of this step-up circuit in other circuits. flash cycle oscillation frequency off interval flashing interval v cc 100 200 300 500 700 1000 inductor value (h) v cc =0.90v v cc =0.95v v cc =1.00v 10 20 30 50 70 100 200 300 500 oscillation frequency (khz) inductor value-oscillation frequency characteristics (reference data) note : the above data are reference values. please set constants using a 50% variance. products to be discontinued
|
