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MAX16020 Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX16020 Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 21 page Low-Power µP Supervisory Circuits with Battery-Backup Circuit and Chip-Enable Gating 10 ______________________________________________________________________________________ Pin Description—MAX16020/MAX16021 PIN MAX16020 MAX16021 NAME FUNCTION 1 1 BATT Backup Battery Input. If VCC falls below its reset threshold, and if VBATT > VCC, OUT connects to BATT. If VCC rises above 1.01 x VBATT, OUT connects to VCC. Bypass BATT to GND with a 0.1µF capacitor. 22 MR Active-Low Manual Reset Input. RESET asserts when MR is pulled low. RESET remains low for the duration of reset timeout period after MR transitions from low to high. Connect MR to OUT or leave unconnected if not used. MR is internally connected to OUT through a 30k Ω pullup resistor. 3 3 PFI Power-Fail Comparator Input. Connect PFI to a resistive divider to set the desired PFI threshold. The PFI input is referenced to an internal threshold VPFT, VPFT-HYS internal hysteresis provides noise immunity. The power-fail comparator is powered from OUT. 4 4 WDI Watchdog Timer Input. If WDI remains high or low for longer than the watchdog timeout period (tWD), the internal watchdog timer runs out and asserts WDO. The internal watchdog clears when reset asserts or whenever WDI sees a rising or falling edge. To disable the watchdog feature, leave WDI unconnected or three-state the driver connected to WDI. 55 LL Active-Low Low-Line Output. LL goes low when VCC falls to 2.5% above the reset threshold (Table 2). LL provides an early warning of VCC failure before reset asserts. Use this output to generate a nonmaskable interrupt (NMI) to initiate an orderly shutdown routine when VCC is falling. 6 — BATT_TEST Open-Drain Battery-Test Output. Pulses low for 1.3s every 24 hours during the battery voltage test. If VBATT < 2.6V, BATTOK deasserts low. See Figure 6 for providing additional load during the battery test. — 6 RESET Active-High Reset Output. RESET asserts when VCC falls below the reset threshold or when MR asserts and stays asserted for the reset timeout period after VCC rises above the reset threshold and MR deasserts. 7 7 BATTOK Battery-OK Output. BATTOK goes low when the battery voltage falls below the BATTOK threshold (BATTOK is low when in battery-backup mode). 8 8 BATTON Active-High Battery-On Output. BATTON goes high when in battery-backup mode. |
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