Remaining Battery Power Display MM1305 MITSUMI Remaining Battery Power Display Monolithic IC MM1305 Outline This IC detects battery voltage and displays the power remaining in the battery. Portable equipment is becoming more and more popular, and one standard function of this type of equipment is remaining battery power display. This IC has four threshold voltages built in. Since their respective detection circuits share the reference voltage on one chip, the detection voltage for each lags in the same direction. Thus, there is much smaller error as compared to the reciprocal error resulting from combining single circuits. Also, the stepped display of remaining battery power as in nickel cadmium, nickel hydrogen and lithium ion batteries is enabled through super high precision voltage detection of ±1%. Features 1. A separate line-up of detection voltages for alkaline magnesium and nickel cadmium and nickel hydrogen batteries. Alkaline magnesium : 1.350V /1.285V /1.200V /1.100V Nickel cadmium, nickel hydrogen : 1.275V /1.245V /1.205V /1.100V 2. Super high precision detection voltage : ±1% typ. 3. Low current consumption : Waiting : 1.5µA Detection : 12µA 4. Ripple absorption pin Enables continuous ripple absorption and suppresses detection errors. 5. Built-in hysteresis voltage Package VSOP-8A (MM1305XW, MM1305AW, MM1305BW) Absolute Maximum Ratings Item Specification Unit Storage temperature -40~+125 °C Operating temperature -20~+70 °C Input voltage 5 V Output pin voltage 5 V Allowable loss 300 mW Remaining Battery Power Display MM1305 MITSUMI Electrical Characteristics (Unless otherwise specified Ta=25°C, VCC=1.5V) Item Measurement Conditions Min. Typ. Max. Unit 12.0 8.0 µA 1.5 2.5 µA 1.330 1.350 1.370 1.270 1.285 1.300 1.185 1.200 1.215 4 1.089 1.100 1.111 1 1.262 1.275 1.288 1.232 1.245 1.258 1.193 1.205 1.217 1.089 1.100 1.111 VTH1=VTH1-VTH4 230 250 270 VTH2=VTH2-VTH4 160 185 200 3 VTH3=VTH3-VTH4 85 100 115 1 VTH1=VTH1-VTH2 20 30 40 VTH2=VTH2-VTH3 30 40 50 VTH3=VTH2-VTH4 135 145 155 Current consumption VCC=1.3V, CE pin=L Current consumption during waiting Detection voltage 1 2 Rank A 3 2 Rank X 3 VCC=H L VCC=H L 4 Detection voltage Difference 1 2 2 3 Rank A Rank X ±200 Detection voltage temperature factor 10 Hysteresis voltage VCC=1.3V, Output saturation voltage=0.3V Output sink current 3 ISINK=30µA 4 3 250 150 250 150 250 150 250 1 VCC=1.0V, Output saturation voltage=1.5V mV mV 1 µA 1 Input H voltage CE pin=0V L voltage Ripple absorption resistance mV 1 0.70 0.75 V VCC-0.3 VCC VCC-0.3 V 100 300 500 nA -0.3 0 -0.3 V 70 100 130 kΩ Power supply voltage operating limit L voltage 35 150 4 CEpin mV µA Output leak voltage 1 2 V ppm/°C 40 Output saturation voltage 1 2 20 V measure resistance between pins 8pin-6pin Remaining Battery Power Display MM1305 MITSUMI Block Diagram, Example of Application Circuit Timing Chart Hysteresis Hysteresis Hysteresis VCC Hysteresis Output VCC VTH1 VTH2 VTH3 VTH4 OUT1 VCC VTH1 TH2 TH3 TH4 OUT 1 L H H H H OUT 2 L L H H H OUT 3 L L L H H OUT 4 L L L L H OUT2 CE pin H Operation L Waiting OUT3 Note : Please connect the CE pin to Vcc when not using. OUT4 VCC CE GND