Data Sheet

Rev 0 6
Output (OUT1, OUT2, OUT3, OUT4)
Output pull-down
current
I
PULL
INx＞1.3V，OUTx＝0.3V 10 uA
Output Leakage Current ILKG INx＜1.18V 1 uA
Logic input (CHRG，BLINK，HYS1，HYS2)
Input low level VINL Logic input voltage drops 0.6 V
Input high level VCEH Logic input voltage rises 0.7×VDD V
IINL
Logic input is grounded,
VDD=6V
－1
Input current
I
INH
Logic input is connected to
VDD, VDD=6V
＋1
uA
Detailed Description
CN1185 is a low-power four-channel voltage monitoring circuit chip. It has a start-up circuit, voltage
reference, four voltage comparator, the comparator output hysteresis setting unit and control unit. CN1185
operating current is only 7.3 microamps (typical), which is very suit for battery powered applications.
Comparator hysteresis by two logic inputs HYS1 and HYS2 programming control, allows the user to set a
different delay depending on the application, and effectively inhibited the noise and the load of the output
error caused by mutations. In addition, CN1185 also have comparator threshold control input CHRG,
which is suitable for battery voltage monitoring applications. When the battery is charging, CHRG is set
low, the comparator drops threshold will be increased by 3% to offset the connection resistance of the
battery internal resistance or the battery connection terminal voltage due to the rise, this comparator is
responsible for the actual battery voltage. Because the user can set the comparator threshold and hysteresis ,
that making CN1185 is suitable for roughly monitoring battery voltage applications.
When the CN1185 power, start-up circuit work in order to avoid voltage instability on the impact of the
electric moment, start-up circuit to ensure that the 7.5 ms after power on (minimum), regardless of more the
input voltage is greater than or less than the threshold comparator flip, CN1185 output are high impedance
state. When after t he start-up time, CN1185 output comparison results.due to the actual comparator input
voltage.
Applications Information
The comparator drops threshold set
CN1185 comparator flip down threshold is when the comparator's negative input voltage drops, the
comparator output from low to high resistance state corresponds to the negative input voltage. Comparator
threshold can flip down the threshold by turning the control input of the CHRG to set, as shown below.
The threshold of flipping down
CHRG Level
Min Typical Max
Explain
Low 1.22V 1.256V 1.29V
The negative comparator
input voltage drops
High 1.189V 1.22V 1.251V
The negative comparator
input voltage drops
Comparator set flipping down the battery voltage threshold value is mainly used in the monitoring. When
the battery is charging, the battery internal resistance and connection resistance exists, may make the
detection point of the actual voltage higher than the battery voltage, in this case, in order to reflect the