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Os motores de busca de Datasheet de Componentes eletrônicos |
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Os motores de busca de Datasheet de Componentes eletrônicos |
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SP791EB Folha de dados(PDF) 3 Page - Sipex Corporation |
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SP791EB Folha de dados(HTML) 3 Page - Sipex Corporation |
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3 / 6 page  3 SP791 Evaluation Board Manual SP791EB/04 ©Copyright 2000 Sipex Corporation Pin 10 - LOWLINE - LOWLINE Output goes low when V CC falls to 150mV above the reset threshold. The output can be used to generate a NMI (non-maskable interrupt) if the unregulated supply is inaccessible Pin 11 - WDI - Watchdog Input. WDI is a three- level input. If WDI remains either high or low for longer than the watchdog timeout period, WDO goes low. WDO remains low until the next transition at WDI. Leaving WDI unconnected disables the watchdog function. WDI connects to an internal voltage divider between V OUT and GND, which sets it to 1.8V when left unconnected. For a simple check of watchdog function, connect WDI to either Probe pins GND or V OUT to cause WDO to go to a Logic Low and produce pulses at WDPO every 1.6 seconds. (typically 1.6 seconds unless an external capacitor is used at the SWT pin). Pin 12 - CE OUT - Chip-Enable Output. The Chip-Enable (CE) function CE OUT provides internal gating of chip enable signals to prevent erroneous data from corrupting the CMOS RAM in the event of a power failure. During normal operation, the CE gate is enabled and all CE transitions are passed from CE IN to CE OUT. When Reset is asserted, this path is disabled. Note that CE OUT goes low (active) only when CE IN is low and V CC is above the reset thresh- old. If CE IN is low when reset is asserted, CE OUT will stay low for 15us or until CE IN goes high, whichever occurs first. Pin 13 - CE IN - Chip-Enable Input. The Input to chip-enable gating circuit. Connect to GND or V OUT if not used. Pin 14 - WDO - Watchdog Output. WDO goes low if WDI remains either high or low longer than the watchdog timeout period. WDO returns high on the next transition at WDI. WDO remains high if WDI is unconnected. WDO is also high when RESET is asserted. Pin 15 - RESET - RESET Output goes low whenever V CC falls below the reset threshold. RESET will remain low for 200ms after V CC crosses the reset threshold on power-up. Pin 16 - WDPO - Watchdog-Pulse Output. Upon the absence of a transition at WDI,WDPO will pulse low for 1ms. WDPO precedes WDO by 70ns. Note: To accurately measure the extremely small supply current in Battery Back-up mode, you need to cut split pads SP1 & SP2 (solder side of board) severing connections to C1 & C2 which would have leakage currents in the measurement range. Also, remove charging circuit components C BATT and D1 if they are installed. |
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