X-On Electronics has gained recognition as a prominent supplier of DS1831+ Supervisory Circuits across the USA, India, Europe, Australia, and various other global locations. DS1831+ Supervisory Circuits are a product manufactured by Analog Devices. We provide cost-effective solutions for Supervisory Circuits, ensuring timely deliveries around the world.
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DS1831/A/B Multisupply Micromonitor www.maxim-ic.com FEATURES PIN ASSIGNMENT 5V power-on reset DS1831 3.3V power-on reset Two referenced comparators with separate IN 1 16 IN 5V 3.3V outputs for monitoring additional supplies RST 2 15 RST 5V 3.3V Internal power is drawn from higher of either TOL 3 14 TOL 5V 3.3V the IN input or the IN input 5V 3.3V TD 4 13 TD Excellent for systems designed to operate 5V 3.3V with multiple power supplies PBRST 5 12 PBRST 5V 3.3V Asserts resets during power transients IN1 6 11 NMI1 Pushbutton reset input for system override IN2 7 10 NMI2 Maintains reset for user configurable times of 10ms, 100ms, or 1s GND 8 9 MPBRST Watchdog timer for software monitoring 16-Pin (300mil) DIP (DS1831A) & 16-Pin (150mil) SO Precision temperature-compensated voltage reference and voltage sensor 16 pin DIP and 16 pin 150mil SO available Operating Temperature of -40C to +85C DS1831A DS1831B IN 1 16 IN IN 1 16 IN 5V 3.3V 5V 3.3V RST 2 15 RST RST 2 15 RST 5V 3.3V 5V 3.3V TOL 3 14 TOL TOL 3 14 TOL 5V 3.3V 5V 3.3V TD 4 13 TD TD 4 13 TD 5V 3.3V 5V 3.3V PBRST 5 12 PBST PBRST 5 12 PBRST 5V 3.3V 5V IN1 6 11 NMI1 IN1 6 11 NMI1 WDS ST 7 10 IN2 7 10 NMI2 GND 8 9 TD GND 8 9 MPBRST WD 16-Pin (300mil) DIP 16-Pin (300mil) DIP & & 16-Pin (150mil) SO 16-Pin (150mil) SO DESCRIPTION The DS1831 multisupply monitor and reset monitors up to four system voltages: 5V supply, 3.3V (or 3V) supply, and two additional user configurable voltage monitors. DS1831 power for internal operation comes from the higher voltage level of the 3.3V input or the 5V input. One of these inputs must be greater than 1V for device operation. Pushbutton (manual reset) functionality is provided for the 5V reset, the 1 of 14 060303DS1831/A/B 3.3V reset or for all reset outputs by the master pushbutton. The DS1831A replaces one reference comparator and the master pushbutton with watchdog and the DS1831B replaces the 3.3V PBRST with a last reset status output. TOL and TD inputs allow user configuration of the DS1831 for multiple applications. The TOL inputs configure the tolerance for the specified output and the TD inputs configure the reset time delays. PIN DESCRIPTION IN 5V Power Supply Input MPBRST Master Pushbutton (DS1831) 5V TD Watchdog Time Delay Select (DS1831A) WD 5V Reset Open Drain Output Non-maskable Interrupt 2 (DS1831) RST NMI2 5V Watchdog Status Output (DS1831A) WDS TOL Selects 5V Input Tolerance Non-maskable Interrupt 1 5V NMI1 TD Selects 5V Reset Time Delay 3.3V Reset Pushbutton 5V PBRST 3.3V Pushbutton Status Output (DS1831B) PBST 5V Reset Pushbutton TD Select 3.3V Reset Time Delay 3.3V PBRST 5V IN1 Sense Input 1 TOL Selects 3.3V Input Tolerance 3.3V IN2 Sense Input 2 (DS1831) 3.3V Reset Open Drain Output RST 3.3V Watchdog Strobe Inputs ST (DS1831A) GND Ground IN 3.3V Power Supply Input 3.3V DS1831 BLOCK DIAGRAM Figure 1 IN 5V 100k PBRST 5V TD 5V V CC TOL 5V TOLERANCE + BIAS RST 5V TIME DELAY - 1.25V T.C. REFERENCE 100k Level MPBRST Sense & IN 3.3V 100k PBRST 3.3V TD 3.3V V CC TOL 3.3V TOLERANCE RST 3.3V BIAS TIME + DELAY - NMI1 - + IN1 - NMI2 IN2 + GROUND 2 of 14
