• No external components
• Monitors input voltage for undervoltage condition
• Separate inputs for supply (VDD) and monitor (VIN)
• ±1.5% VIN threshold voltage accuracy
• Valid /RST state with VIN down to 0.0V
• Valid /RST state with VDD down to 1.20V
• Factory-programmed 1.62V reference
• Manual reset input (/MR)
• Active low RESET (/RST) output
• Ultra-low input current - 5µA total (VIN and VDD)
• Rejects brief input transients
• -40°C to 85°C operating temperature range
• RoHS lead-free compliant
• Available in tiny 6-pin 1.2mm x 1.2mm Thin QFN package

The MIC2785 is a micropower voltage monitor that provides undervoltage monitoring and manual reset capability in a tiny 1.2mm x 1.2mm QFN package. The MIC2785 provides a monitored voltage input (VIN) separate from the supply input (VDD). This ensures that the reset (/RST) output maintains a valid output state when the voltage being monitored ramps up or down. The device also includes a manual reset input (/MR). The /RST output is an active low push-pull output.

The undervoltage detector compares the VIN pin voltage against the factory-programmed threshold of 1.62V. The reset output is asserted any time the input voltage drops below the programmed threshold voltage. A reset can be generated at any time by asserting the manual reset input, /MR. This reset output will remain active until the release of /MR. The /MR input can also be used to daisy-chain the MIC2785 onto existing power monitoring circuitry or other supervisors. Hysteresis is included to prevent chattering due to noise.

The MIC2785 consumes a minimum of quiescent current, only 5µA, 1.5µA from the main supply pin and 3.5µA from the input pin. Offered in a tiny space saving 6-pin QFN 1.2mm x 1.2mm package.