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SP805LCN Datasheet(PDF) 4 Page - Exar Corporation |
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SP805LCN Datasheet(HTML) 4 Page - Exar Corporation |
4 / 16 page Date: 11/29/04 SP690A/692A Low Power Microprocessor Supervisory with Battery Switch-Over © Copyright 2004 Sipex Corporation 4 PIN ASSIGNMENTS Pin 1 —V OUT — Output Supply Voltage. VOUT connects to V CC when VCC is greater than V BATT and VCC is above the reset thresh- old. When V CC falls below VBATT and V CC is below the reset threshold, VOUT connects to V BATT. Connect a 0.1µF capacitor from V OUT to GND. Pin 2 — V CC — +5V Supply Input Pin3 — GND — Ground reference for all signals Pin 4 — PFI — Power-Fail Input. This is the noninverting input to the power-fail com- parator. When PFI is less than 1.25V, PFO goes low. Connect PFI to GND or V OUT when not used. Pin 5 — PFO — Power-Fail Output. Pin 6 — WDI — Watchdog Input. WDI is a three level input. If WDI remains high or low for 1.6sec, the internal watchdog timer triggers a reset. If WDI is left floating or connected to a high-impedance tri-state buffer, the watchdog feature is disabled. The internal watchdog timer clears when- ever reset is asserted. Pin 7 for SP690A/692A/802 only — RESET (Active Low)– Reset Output. RESET Out- put goes low whenever V CC falls below the reset threshold or whenever WDI remains high or low longer than 1.6 seconds. RESET remains low for 200ms after V CC crosses the reset threshold voltage on power-up or after being trig- gered by WDI. Pin 7 for SP805 only — RESET (Active High)– Reset Output is the inverse of RESET; when RESET is asserted, the RESET output voltage = V CC or V BATT , whichever is higher. Pin 8 — V BATT — Backup-Battery Input. When V CC falls below the reset threshold, VBATT will be switched to V OUT if VBATT is 20mV greater than V CC. When VCC rises 20mV above V BATT, VOUT will be reconnected to V CC. The 40mV hysteresis prevents repeated switching if V CC falls slowly. Figure 10. Pinout Figure 11. Internal Block Diagram VOUT VCC GND PFI VBATT RESET (RESET)* WDI PFO 1 2 3 4 5 6 7 8 *( ) SP805 only 1.25V 0.8V 3.5V 1.25V BATTERY-SWITCHOVER CIRCUITRY PFI WDI VCC VBATT RESET GENERATOR VOUT RESET (RESET)* PFO WATCHDOG TIMER *( ) SP805 only |
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