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MAX16068 Datasheet(PDF) 14 Page - Maxim Integrated Products |
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MAX16068 Datasheet(HTML) 14 Page - Maxim Integrated Products |
14 / 40 page ![]() 14 _____________________________________________________________________________________ 6-Channel, Flash-Configurable System Manager with Nonvolatile Fault Registers ALERT GPIO1 is configurable as the SMBus alert signal, ALERT. ALERT asserts when any fault condition occurs. When the SMBus host sends the ARA (Alert Response Address), the MAX16068 responds with its slave address and deasserts ALERT. ALERT is an open-drain output. Set the ARAEN bit in r40h[4] to ‘1’ to disable the ARA feature. Under these conditions, the device does not respond to an ARA on the SMBus line. FAULT GPIO2 is configurable as a dedicated fault output, FAULT. FAULT asserts when an overvoltage or under- voltage condition occurs on the selected inputs. FAULT dependencies are set using registers r36h and r37h (see Table 8). When FAULT depends on more than one MON_, the fault output asserts when one or more MON_ exceeds a programmed threshold voltage. FAULT acts independently of the critical fault system, described in the Critical Faults section. Use r37h[7] to set the polarity of FAULT. Manual Reset (MR) GPIO3 is configurable to act as an active-low manual reset input, MR. Drive MR low to assert RESET. RESET remains asserted for the selected reset timeout period after MR transitions from low to high. When connecting MR to a push- button, use a pullup resistor. See the Reset Output section for more information on selecting a reset timeout period. Watchdog Input (WDI) and Output (WDO) GPIO4 and GPIO5 are configurable as the watchdog timer input (WDI) and output, WDO, respectively. See Table 16 for configuration details. WDO is an open-drain, active-low output. See the Watchdog Timer section for more information about the operation of the watchdog timer. External Fault (EXTFAULT) GPIO6 is configurable as the external fault input/output, EXTFAULT. EXTFAULT asserts if any monitored volt- age exceeds an overvoltage or undervoltage threshold. EXTFAULT also asserts if a power-up or power-down sequencing fault occurs. This signal can be used to cascade multiple MAX16068s. For the MAX16068, if register bit r6Dh[2] is set in addi- tion to r72h[5], EXTFAULT going low triggers a nonvola- tile fault log operation. Table 8. FAULT Dependencies REGISTER ADDRESS FLASH ADDRESS BIT RANGE DESCRIPTION 36h 236h [0] FAULT depends on MON1 undervoltage threshold [1] FAULT depends on MON2 undervoltage threshold [2] FAULT depends on MON3 undervoltage threshold [3] FAULT depends on MON4 undervoltage threshold [4] FAULT depends on MON5 undervoltage threshold [5] FAULT depends on MON6 undervoltage threshold [7:6] Not used 37h 237h [0] FAULT depends on MON1 overvoltage threshold [1] FAULT depends on MON2 overvoltage threshold [2] FAULT depends on MON3 overvoltage threshold [3] FAULT depends on MON4 overvoltage threshold [4] FAULT depends on MON5 overvoltage threshold [5] FAULT depends on MON6 overvoltage threshold [6] Not used [7] 0 = FAULT is an active-low digital output 1 = FAULT is an active-high digital output |
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