MIC2755

The MIC2755 is composed of multiple comparators, a reset pulse generator, and logic. It is designed for monitoring the battery supply of portable digital systems, including PDAs and pagers.

The MIC2755 detects three different battery states: battery OK, low battery, and dead battery. The reset (/RST) output is asserted for at least 700ms when a fresh battery is inserted. The nonmaskable interrupt output (/NMI) is asserted when the battery voltage is below the NTH threshold, indicating that high-power system operations should not occur. If and when battery voltage falls below the power-off threshold (PTH), the reset output is asserted and latched, inhibiting system operation until the battery is replaced or recharged.

All three voltage thresholds are set using external resistors. A manual reset function can be implemented by connecting a switch directly to the power on reset/manual reset [RTH(/MR)] input. Internal circuitry detects switch activation and generates a minimum 175ms debounced reset signal. The MIC2755's power supply input is separate from the detector inputs to allow it to be powered from a down-stream voltage, such as the output of a boost converter.

Inputs and outputs can be pulled above VDD (up to 7V absolute maximum) without adverse effects or excessive current draw.

Supply current is typically a low 2µA. Hysteresis is included on all voltage detectors to prevent chattering due to noise. The MIC2755 is available in the tiny 8-pin micro-small-outline package (MSOP).

Features
  • Optimized for PDAs, pagers and other hand-held devices.
  • Detects multiple battery states: Battery OK, Low battery, Dead battery.
  • Adjustable voltage thresholds
  • High accuracy ±2% voltage thresholds
  • Reset generation at power-on (700ms min.)
  • Debounced manual reset function
  • Internal logic prevents chatter if battery voltage fluctuates
  • Extremely low 2µA typical supply current
  • I/Os can be pulled above VDD (7V absolute maximum)
  • Immune to brief power supply transients
  • Low cost
  • 8-pin MSOP
Parameter
Parameter Name Value Value
Manual Reset Yes Yes
Typical Reset Pulse Width (ms) 700 700
Reset Type Active-Low/Open-Drain Active-Low/Open-Drain
Typical Supply Current (uA) 2 2
Nominal Reset Voltage (V) 1.24 1.24
Product Type Single Voltage Monitor Single Voltage Monitor
Documents
MIC2755 - Battery Operated SupervisorData Sheets11/05/2015638KB
RoHS Information
PartNumberDeviceWeightShippingWeightLeadCountPackageTypePackageWidthSolderCompositionJEDECIndicatorRoHSChinaEFUP
MIC2755YMM0.0251000.1246008MSOP3x3x1.0mmNiPdAue4
MIC2755 - Battery Operated Supervisor MIC2755