Maxim's new EEPROM-programmable, hex/quad power-supply sequencers/supervisors with an integrated 10-bit ADC are system-management devices that combine voltage monitoring, supervisory functions, margining control, and sequencing control. The MAX6870/1 devices are programmed through an I²C interface that selects monitored voltage thresholds, sequence and reset-timing specifications, and sets output configurations. Internal configuration EEPROM is used to store and update changes as necessary.
The MAX6870 features six voltage-detector inputs and eight programmable outputs, while the MAX6871 features four voltage-detector inputs and five programmable outputs. All voltage detectors offer dual voltage thresholds in 10 mV increments for undervoltage, overvoltage, or dual undervoltage detection. These detectors can be configured to assert any of the outputs when any voltage is out of regulation.
The programmable outputs can be used to sequence supplies or provide system resets and interrupts with active-high or active-low logic. These outputs can be configured with open-drain, push-pull, and a charge-pump option (for driving external n-channel MOSFETs). There are eight available timeout periods ranging from 25 μs to 1600 ms. A margining enable input is available to set the outputs into a default (or disable) state.
An internal 8-channel, 10-bit ADC reads back the all the monitored voltages and two external inputs into its ADC registers. The ADC can be used to monitor voltage during margining or when trimming a power supply. Other features include four general-purpose inputs, two watchdog timers, and a manual reset input. The devices are available in a 7 mm x 7 mm QFN package and specified for -40 to +85°C.
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