Data Sheet

Rev 0 10
Figure 3 CN1185 to achieve three-color LED indicates
For example the lithium battery to illustrate the working principle.
Technical Requirements:
(1) The battery voltage is greater than 3.63V, the bright green LED, that battery power sufficient;
(2) The battery voltage is between 3.4V and 3.63V, the red LED and green LED is lit (shown in yellow),
indicating that the battery energy is generally;
(3) The battery voltage is less than 3.4V, the red LED is lit, that battery power shortage, need for battery
charging.
Using CN1185 three comparators, Vth1, Vth2 and Vth3 were set to 2.5V, 3.4V and 3.63V, which is based
on lithium battery 2.5V minimum voltage setting. Resistors R6 and R7 is the LED current limiting resistor,
the LED brightness levels according to resistance; R8 is OUT3 pull-up resistor, the resistors according to
the value of allowable power.
 When the battery voltage is 2.5V-3.4V, IN1 voltage is higher than the first comparator flip threshold,
IN2 and IN3 respectively is lower than the second and third comparator flip threshold, at this time,
CN1185 OUT1 output low, OUT2 and OUT3 output high, NMOS MOSFET is on, the red LED lights,
green LED off.
 When the battery voltage is 3.4V-3.63V , IN1 and IN2 voltage is higher than the first and second
comparator flip threshold, IN3 below the threshold of the third comparator flip , at this time, CN1185
OUT1 and OUT2 output low, OUT3 output high, NMOS MOSFET is on, while the red and green
LED lights to show the effect of yellow.
 When the battery voltage is above 3.63V, IN1, IN2 and IN3 voltage respectively is higher than the first,
second and third comparator flip threshold, OUT1, OUT2 and OUT3 output low, NMOS is shut off,