SLAS986D November 2014 – February 2018 AMC7836
The AMC7836 device includes a power-on reset (POR) function. After all supplies have been established, a POR event is issued. The POR causes all registers to initialize to the default values, and communication with the device is valid only after a 250 µs power-on reset delay.
The default operation is power-down mode (register 0x02) in which the device is non-operational except for the communication interface as determined by the power-down registers. Before enabling normal operation, a hardware reset should be issued.
A power failure on DVDD, AVDD, AVCC or IOVDD has the potential to initiate a power-on-reset event. As long as DVDD, AVDD, AVCC, and IOVDD remain above the minimum recommended operating conditions a power failure event will not occur. When any of these supplies drops below the minimum recommended operating condition the device may or may not imitate a POR. In this case, issuing a hardware reset or proper POR is recommended to resume proper operation. To ensure a proper POR event, the DVDD supply must fall below 750 mV. If the DVDD supply falls below 2.7 V a hardware reset or proper POR must be issued.