The ADM1060 is a programmable supervisory/sequencing device which offers a single chip solution for multiple power supply fault detection and sequencing in communications systems.
In central office, servers and other infrastructure systems, a common backplane dc supply is reduced to multiple board supplies using dc/dc converters. These multiple supplies are used to power different sections of the board (eg) 3.3V Logic circuits, 5V logic circuits, DSP core and I/O circuits etc. There is usually a requirement that certain sections power up before others (eg) a DSP core to power up before the DSP I/O or vice versa. This is in order to avoid damage, miscommunication or latch- up. The ADM1060 facilitates this, providing supply fault detection and sequencing/combinatorial logic for up to 7 independent supplies. The 7 Supply Fault Detectors consist of one high voltage detector (up to +14.4V), two bipolar voltage detectors (up to +6V OR down to -6V) and 4 positive low voltage detectors (up to +6V). All of the detectors can be programmed to detect undervoltage, overvoltage or out- of window (undervoltage OR overvoltage) conditions. The inputs to these Supply Fault Detectors are via the VH pin (High Voltage), VBn pins (positive OR negative) and VPn pins (Positive only) pins respectively. Either the VH supply or one of the VPn supplies is used to power the ADM1060 (whichever is highest). This ensures that, in the event of a supply failure, the ADM1060 is kept alive for as long as possible, thus enabling a reliable fault flag to be asserted and the system to be powered down in an ordered fashion.
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