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SCL Datasheet(PDF) 20 Page - Exar Corporation |
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SCL Datasheet(HTML) 20 Page - Exar Corporation |
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20 / 29 page  X XR RP P7 77 72 24 4 Q Qu ua ad d C Ch ha an nn ne ell D Diig giitta all P PW WM M/ /P PF FM M P Prro og grra am mm ma ab blle e P Po ow we err M Ma an na ag ge em me en ntt S Sy ys stte em m © 2012 Exar Corporation 20/29 Rev. 1.0.1 HW Flags – these are hardware monitoring functions forwarded to GPIO0 only. The functions include Under-Voltage Warning, Over- Temperature Warning, Over-Voltage Fault, Over-Current Fault and Over -Current Warning for every channel. Multiple selection is available in which case the resulting signal is the OR logic function External Clock-in – enables the controller to lock to an external clock including one from another XRP7724 applied to the GPIO0 pin. There are two ranges of clock frequencies the controller accepts, selectable by a user HW Power Good – the Power Good hardware monitoring function. It can only be forwarded to GPIO1. It is an output voltage monitoring function that is a hardware comparison of channel output voltage against its user defined Power Good threshold limits (Power Good minimum and maximum levels). . It has no hysteresis. Multiple channel selection is available in which case the resulting signal is the AND logic function of all channels selected. The Power Good minimum and maximum levels are expressed as percentages of the target voltage. “PGood Max” is the upper window and “PGood Min” is the lower window. The minimum and maximum for each of these values can be calculated by the following equation: Where N =1 to 63 for the PGOOD Max value and N=1 to 62 for the PGOOD Min value. For example, with the target voltage of 1.5V and set point resolution of 2.5mV (LSB), the Power Good min and max values can range from 0.17% to 10.3% and 0.17% to 10.5% respectively. A user can effectively double the values by changing to the next higher output voltage range setting, but at the expense of reduced set point resolution. External Clock-out – clock sent out through GPIO1 for synchronizing with another XRP7724 (see the clock out section for more information). FAULT HANDLING There are seven different types of fault handling: Under Voltage Lockout (UVLO) monitors voltage supplied to the Vcc pin and will cause the controller to shutdown all channels if the supply drops to critical levels. Over Temperature Protection (OTP) monitors temperature of the chip and will cause the controller to shutdown all channels if temperature rises to critical levels. Over Voltage Protection (OVP) monitors regulated voltage of a channel and will cause the controller to react in a user specified way if the regulated voltage surpasses threshold level. Over Current Protection (OCP) monitors current of a channel and will cause the controller to react in a user |
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