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MAX16021 Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX16021 Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 21 page Low-Power µP Supervisory Circuits with Battery-Backup Circuit and Chip-Enable Gating _______________________________________________________________________________________ 9 Pin Description—MAX16016 PIN NAME FUNCTION 1VCC Supply Voltage Input. Bypass VCC to GND with a 0.1µF capacitor. 2 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. 3 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 VCC or leave unconnected if not used. MR is internally connected to VCC through a 30k Ω pullup resistor. 4 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 VPFT threshold. A VPFT-HYS internal hysteresis provides noise immunity. The power-fail comparator is powered from OUT. 5 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 a reset pulse is triggered for the reset timeout period. 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. 6 BATTON Active-High Battery-On Output. BATTON goes high when in battery-backup mode. 7 PFO Active-Low Power-Fail Comparator Output. PFO goes low when VPFI falls below the internal VPFT threshold and goes high when VPFI rises above VPFT + VPFT-HYS hysteresis. 8 GND Ground 9 RESET Active-Low Reset Output. RESET asserts when VCC falls below the reset threshold or MR is pulled low. RESET remains low for the duration of the reset timeout period after VCC rises above the reset threshold and MR goes high. RESET also asserts low when the internal watchdog timer runs out. 10 OUT Switched Output. OUT is connected to VCC when the reset output is not asserted or when VCC is greater than VBATT. OUT connects to BATT when RESET is asserted and VBATT is greater than VCC. Bypass OUT to GND with a 0.1µF (min) capacitor. |
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