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MAX1660 Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX1660 Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 20 page Overcurrent Detection The MAX1660’s precision analog interface continuously monitors the input current to detect an overcurrent con- dition. Figure 7 shows the functional diagram of the overcurrent comparator section. An overcurrent condition occurs whenever the voltage on CS exceeds the voltage on OCI (for charging cur- rents), or when ODI falls below ground (for discharging currents). When an overcurrent condition occurs, the overcurrent comparators generate an interrupt (INT goes low) and set the OD (discharging) or OC (charg- ing) latch, which remains set until either the configura- tion word’s CLRINT bit is set, the MAX1660 enters soft- shutdown mode, or the MAX1660 initiates a power-on reset. The host defines any action taken upon receipt of this interrupt. A logic block follows the latch, which sets the gate-driver output’s appropriate state, as defined in Table 4, and drives the N-channel MOSFET open-drain gate drivers. Although the host has complete control over the MAX1660’s response to an overcurrent condition, take care to ensure adequate overcurrent protection. In gen- eral, the configuration word’s OCLO and ODLO bits should always remain cleared. This ensures that either the MAX1660 will be in overcurrent auto-detect mode (the power-on-reset state), or the external FETs are forced off (the load is disconnected). Regardless of the OCLO and ODLO bit settings, the MAX1660 interrupts the host (INT goes low) if the current flow exceeds the overcurrent threshold. When OCHI = OCLO = 1 or ODHI = ODLO = 1, the cor- responding overcurrent comparator operates in free- running mode, driving OCO and ODO directly. When the current exceeds the overcurrent threshold, the appropriate MOSFET turns off, and when the current is below the overcurrent threshold, it turns on. Forcing the MOSFET off prevents current from flowing, which in turn decreases the current flow to below the over- current threshold. A persistent overcurrent condition, therefore, produces a pulsed output as the current flow repeatedly crosses the overcurrent threshold. In free- running mode, INT pulls low when the first overcurrent condition occurs, and stays low until the interrupt is cleared, as described in the INT Output section. Operation in this mode requires that OCO and ODO be buffered to ensure fast MOSFET turn-off and slow MOSFET turn-on times. The relatively slow turn-off response of the OCO and ODO open-drain outputs alone is unsuitable for driving MOSFETs directly in this mode. Digitally Controlled Fuel-Gauge Interface ______________________________________________________________________________________ 11 + - ODI S R Q ODO LOGIC ODO ODSTATUS ODICMP POWER-ON RESET ODLO CLRINT ODHI + - OCI CS S R Q OCO LOGIC OD OC OCO OCSTATUS OCICMP a) DISCHARGING DIRECTION b) CHARGING DIRECTION POWER-ON RESET OCLO CLRINT OCHI Figure 7. Overcurrent Comparator Section Functional Diagram * Patent pending |
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