Data Sheet

ManualsBrandsSeeedStudio ManualsMisc. AccessoriesBAT Detector LiPo Battery Monitor v1.0

如韵电子 CONSONANCE

www.consonance-elec.com Rev 0 1

Low-Power Four Channel Voltage Monitoring Circuit

CN1185

General Description

CN1185 is a low-power four-channel voltage

monitoring chip, it consumes only 7.3 microamps

current, very suitable for monitoring the battery

voltage. The divice contains four voltage

comparators, each comparator's positive input

received on-chip voltage reference. It can be used

to monitor four different voltage source or a

voltage source for monitoring different grades.

Users can choose the logic input to select the

comparator threshold and set the comparator

hysteresis. The existence hysteresis of comparator

is to eliminate the power due to interference or

noise caused by the comparator output instability.

Because the user can set the comparator threshold

and hysteresis, making CN1185 is suitable for

rough monitoring battery applications. In order to

facilitate work on the same system with different

voltage chip applications, CN1185 open-drain

output. In order to ensure an instant system

power-on work, CN1185 internal design of the 7.5

ms (minimum) start time, the comparator output

high impedance state in the start time.

The device is available in 16 pin TSSOP package

Features

 Operating supply voltage range：2.7V-6V

 7.3µA Supply Current @V

=4V

 Guaranteed Output Valid to V

= 1.2V

 Four-channel voltage comparator

 Open-drain output

 Start time: 15 ms (typical)

 Output can drive LED or connected with the

microprocessor

 Precise Reset Threshold: 2.5%

 Comparator hysteresis can be set by two

logical ports

 60ms typical Delay to Filter out the noise

 Blink output control function

 Operating Temperature Range

-40°C to +85°C

 Available in TSSOP16

Pin Assignment

Applications

 Battery-powered Systems

 Mobile and cordless phones

 Portable devices and equipment

 Micro-controller system

 Monitoring and alarm applications

Summary of content (12 pages)

PAGE 1
如韵电子 CONSONANCE Low-Power Four Channel Voltage Monitoring Circuit CN1185 General Description Features CN1185 is a low-power four-channel voltage monitoring chip, it consumes only 7.3 microamps current, very suitable for monitoring the battery voltage. The divice contains four voltage comparators, each comparator's positive input received on-chip voltage reference. It can be used to monitor four different voltage source or a voltage source for monitoring different grades.
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Typical Application Circuit Figure 1 Typical Application Circuit Note: CN1185 the comparator output can be pulled up to VDD through the resistor side directly Ordering Information: Part No.
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Block Diagram Figure 2 Block Diagram Rev 0 3
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Pin Description Pin No. 1 2 3 Symbol Description IN1 The first negative input way of comparator. It can be monitored directly connected or through an external resistor voltage divider network to set the flip threshold voltage. OUT1 IN2 The first way output of comparator. Open-drain output. When IN1 rise, and exceed the comparator threshold, the device from OUT1 to GND NMOSFET on, OUT1 output low.
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12 HYS2 Input of Comparator hysteresis (Hysteresis) to set. Logic inputs, HYS1 and HYS2 set the comparator hysteresis . 13 GND Negative Terminal of Power Supply(Ground) 14 BLINK 15 NC 16 VDD Input of flash output control. Logic input, when the comparator output is low, the comparator flip CHRG threshold control input is low, and BLINK pin is high, the comparator output is about 500 ms conversion time at intervals , the duration of high and low the same. No Connection.
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Output (OUT1, OUT2, OUT3, OUT4) Output current pull-down Output Leakage Current IPULL ILKG INx＞1.3V，OUTx＝0.3V 10 uA INx＜1.18V 1 uA Logic input (CHRG，BLINK，HYS1，HYS2) Input low level VINL Input high level VCEH Logic input voltage rises 0.7×VDD IINL Logic input is grounded, VDD=6V －1 Input current Logic input voltage drops 0.6 V uA Logic input is connected to VDD, VDD=6V IINH V ＋1 Detailed Description CN1185 is a low-power four-channel voltage monitoring circuit chip.
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actual battery voltage, the CHRG pin can set low, making the comparator threshold from 1.22V flip up to 1.256V (that is, increase 3% turning down threshold), To some extent to achieve a connection to the battery's internal resistance and the resistance of the compensation.
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CHRG 1 0 HYS2 HYS1 the comparator drops threshold (typical value) the comparator rising threshold (typical value) 0 0 1.22V 1.22×(1＋1%) 0 1 1.22V 1.22×(1＋3%) 1 0 1.22V 1.22×(1＋6%) 1 1 1.22V 1.22×(1＋10%) 0 0 1.256V 1.256×(1＋1%) 0 1 1.256V 1.256×(1＋3%) 1 0 1.256V 1.256×(1＋6%) 1 1 1.256V 1.
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1 1 1.256V 1.256×(1＋10%) Resistor divider network design example Suppose you want to monitor a single lithium battery voltage, battery voltage drops, four in ascending order of the voltage detection points were Vth1 = 3.19V, Vth2 = 3.47V, Vth3 = 3.69V and Vth4 = 3.99V. Set R1 + R2 + R3 + R4 + R5 = 720KΩ, so the battery voltage is 3.6V, the resistor divider network consumes battery current 5uA, general portable products can be tolerated. R5＝(1.22／3.99)×720＝220KΩ R4＝(1.22／3.69)×720－220＝18KΩ R3＝(1.22／3.
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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.
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red LED off, green LED light.
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Package Information Consonance does not assume any responsibility for use of any circuitry described. Consonance reserves the right to change the circuitry and specifications without notice at any time.