MITSUMI

Control of Lithium Ion Battery Charging and Discharging MM1248

Pin no.

Pin name

Equivalent circuit

Function

8

CDC

Pin for connection to a capacitor to set the dead

time for discharge on/off switching

During discharge : approx. 5V; when discharge

stops : GND level

Dead time is set when discharge is turned off and

discharge stopped

Dead time is approx. 1S for an 0.1µF capacitance

11

BATL

Pin for input of L cell+terminal voltage (in a battery

module with three cells in series, cells are defined,

starting from the high side, as the H cell, M cell

and L cell)

10

FET (G)

Pin for connection to P-ch FET gate for battery

module voltage level input

During discharge "L" is output; when discharge is

stopped switches to "H"

12

OV2

Pin for overvoltage signal output; NPN open

collector output

High-impedance output during normal operation;

switches to "L" on overcharge

The high-potential side of the pull-up resistance

should be 10 V max

14

FET (D)

Pin for connection to drain of P-ch FET for battery

module voltage level input

13

BATM

Pin for input of M cell+terminal voltage

16

Power supply input pin for overcharge detection,

discharge control, battery module voltage

monitoring units

15

Pin for input of H cell+terminal voltage

9

GND

GND pin for this IC