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MAX16035PLB31+ Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX16035PLB31+ Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 21 page Low-Power Battery Backup Circuits in Small µDFN Packages _______________________________________________________________________________________ 7 Pin Description PIN MAX16033– MAX16036 (10-pin µDFN) MAX16037– MAX16040 (8-pin µDFN) NAME FUNCTION 11 RESET Active-Low Reset Output. RESET remains low when VCC is below the reset threshold (VTH), the manual-reset input is low, or RESETIN is low. It asserts low in pulses when the internal watchdog times out. RESET remains low for the reset timeout period (tRP) after VCC rises above the reset threshold, after the manual-reset input goes from low to high, after RESETIN goes high, or after the watchdog triggers a reset event. The MAX160_ _L is an active-low push-pull output, while the MAX160_ _P is an active-low open-drain output. 2— CEIN Chip-Enable Input. The input to the chip-enable gating circuit. Connect to GND or OUT if not used. 3 2 PFI Power-Fail Input. PFO goes low when VPFI falls below 1.235V. 4 3 GND Ground MR Manual-Reset Input (MAX16033/MAX16037). Driving MR low asserts RESET. RESET remains asserted as long as MR is low and for the reset timeout period (tRP) after MR transitions from low to high. Leave unconnected, or connect to VCC if not used. MR has an internal 20k Ω pullup to VCC. WDI Watchdog Input (MAX16034/MAX16038). 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 (tRP). The internal watchdog clears whenever RESET asserts or whenever WDI sees a rising or falling edge (Figure 2). BATTON Battery-On Output (MAX16035/MAX16039). BATTON goes high during battery backup mode. 54 RESETIN Reset Input (MAX16036/MAX16040). When RESETIN falls below 1.235V, RESET asserts. RESET remains asserted as long as RESETIN is low and for at least tRP after RESETIN goes high. 65 PFO Active-Low Power-Fail Output. PFO goes low when VPFI falls below 1.235V. PFO stays low until VPFI goes above 1.235V. PFO also goes low when VCC falls below the reset threshold voltage. 76 VCC Supply Voltage, 1.2V to 5.5V 8 7 OUT Output. OUT sources from VCC when RESET is not asserted and from the greater of VCC or BATT when VCC is below the reset threshold voltage. 9 8 BATT Backup Battery Input. When VCC falls below the reset threshold, OUT switches to BATT if VBATT is 40mV greater than VCC. When VCC rises above VBATT, OUT switches to VCC. The 40mV hysteresis prevents repeated switching if VCC falls slowly. 10 — CEOUT Chip-Enable Output. CEOUT goes low only when CEIN is low and reset is not asserted. When CEOUT is disconnected from CEIN, CEOUT is actively pulled up to OUT. |
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Similar Description - MAX16035PLB31+ |
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