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LTC4150 Datasheet(PDF) 10 Page - Linear Technology |
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LTC4150 Datasheet(HTML) 10 Page - Linear Technology |
10 / 14 page LTC4150 10 4150fc APPLICATIONS INFORMATION AUTOMATIC CHARGE COUNT INTERRUPT AND CLEAR In applications where a CLR pulse is unavailable, it’s easy to make the LTC4150 run autonomously, as shown in Figures 5 and 6. If the microcontroller VCC is less than or equal to the battery VDD, INT may be directly connected to CLR, as in Figure 5. The only requirement is that the microcontroller should be able to provide a high logic level of 1.9V to SHDN. If the microcontroller VCC is greater than the battery VDD, use Figure 6. The resistor dividers on CLR and SHDN keep the voltages at these pins within the LTC4150’s VDD range. Choose an RL value using Equation 11 and R1-R4 values using Equation 13. In either application, the LTC4150 will capture the first assertion of INT and wait at least 1μs before resetting it. This insures that INT pulses low for at least 1μs but gives automatic INT reset. INT SENSE+ SENSE– SHDN CLR POL LTC4150 μP C2 4.7μF RL 10 9 8 7 6 1 2 5 4150 F05 VDD GND RL PROCESSOR VCC POWER-DOWN SWITCH CL 47μF LOAD + CF + CF – 3 4 CF 4.7μF 2.7V TO 8.5V BATTERY RSENSE INT SENSE+ SENSE– SHDN SHUTDOWN R4 R3 CLR POL LTC4150 μP C2 4.7μF RL 10 9 8 7 6 1 2 5 4150 F06 VDD GND RL PROCESSOR VCC POWER-DOWN SWITCH CL 47μF LOAD + CF + CF – 3 4 CF 4.7μF BATTERY VBATTERY < VCC RSENSE R2 R1 Figure 5. Application with INT Direct Drive or CLR and Separate Microprocessor Supply VCC ≤ VDD Figure 6. Application with INT Driving CLR and Separate Microprocessor Supply VCC > VDD |
Similar Part No. - LTC4150_1 |
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Similar Description - LTC4150_1 |
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