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L6260 Datasheet(PDF) 9 Page - STMicroelectronics |
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L6260 Datasheet(HTML) 9 Page - STMicroelectronics |
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9 / 30 page  INTERNAL REGISTER DEFINITION System Status Register (Reg 0) Reg: 0 Name: System Status Register Type: Read only. BIT LABEL DESCRIPTION @POR 0 THERMAL Thermal shutdown = 1, normal = 0. One signifies that the chip temperature has exceeded the 180 °C. The bit will reset when the temperature falls from 180 °C to 140°C (the hysteresis prevents rapid changing of this bit). When this bit is activated, the spindle logic will tristate both high and low side drivers to allow the disk to coast and cool down the chip. 0 1 UV Under Voltage=0, good voltage =1. This signals whether the under voltage circuit has been activated or not. NOTE: When UV=0, the POR is activated and all serial port control logic is reset. This means that writes are impossible, however, the user can still poll the status of this register provided the logic voltage is sufficient for the logic to function. 0 2 FLL_UP Providing mainly for testing. When the FLL is sourcing current into the charge pump capacitor this is set to 1. A 0 means that the sourcing current is disabled. 0 3 FLL_DOWN Providing mainly for testing. When the FLL is sinking current from the charge pump capacitor this is set to 1. A 0 means that the sourcing current is disabled. 0 4 BEMF_SENSE Toggles with BEMF. 0 5 MASK_TIME Mask time currently in use = 1. When 1 this means the BEMF comparator will not sense the zero crossing at this time. A 0 means zero crossing sensing will occur. 0 6 DELAY Delay time currently in use = 1. e.g. A commutation delay is active and at the end of this delay the next commutation is executed. 0 7 AT_SPEED 1=spindle is at speed (set by the first ”down pulse” of the FLL. It is reset at POR. 0 8 UNUSED 0 9 UNUSED 0 10 UNUSED 0 11 UNUSED 0 L6260 9/30 |
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