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LTC4255 Datasheet(PDF) 7 Page - Linear Technology |
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LTC4255 Datasheet(HTML) 7 Page - Linear Technology |
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7 / 16 page  LTC4255 7 4255f B4: Current Limit Timer Select Bit 0. The current limit timer select bits configure tCL, the time a current limit must be sustained before a short-circuit fault occurs. (See tCL in AC Characteristics.) B5: Current Limit Timer Select Bit 1. The current limit timer select bits configure tCL, the time a current limit must be sustained before a short-circuit fault occurs. (See tCL in AC Characteristics.) B6: Open-Circuit Enable Delay Timer Select Bit 0. The open-circuit enable delay timer select bits configure tOCD, the time following a Power_OK condition when no open- circuit faults will be generated. ( See tOCD, in AC Charac- teristics.) B7: Open-Circuit Enable Delay Timer Select Bit 1. The open-circuit enable delay timer select bits configure tOCD, the time following a Power_OK condition when no open- circuit faults will be generated. ( See tOCD, in AC Charac- teristics.) The default setting is all bits set low. Register 3: Status Register 1 (Read Only) C0: Power_OK for Port 1. Logic high indicates switch 1 is on. C1: Power_OK for Port 2. Logic high indicates switch 2 is on. C2: Power_OK for Port 3. Logic high indicates switch 3 is on. C3: Power_OK for Port 4. Logic high indicates switch 4 is on. C4: Reserved. Logic high. C5: Reserved. Logic low. C6: Reserved. Logic low. C7: Reserved. Logic low. Register 1: Control Register ( Write Only) A0: Switch 1 Enable. Logic high turns on Port 1 switch, logic low turns off the Port 1 switch. A1: Switch 2 Enable. Logic high turns on Port 2 switch, logic low turns off Port 2 switch. A2: Switch 3 Enable. Logic high turns on Port 3 switch, logic low turns off Port 3 switch. A3: Switch 4 Enable. Logic high turns on Port 4 switch, logic low turns off Port 4 switch. A4: Relay 1 Enable. Logic high turns on Port 1 relay, logic low turns off Port 1 relay. A5: Relay 2 Enable. Logic high turns on Port 2 relay, logic low turns off Port 2 relay. A6: Relay 3 Enable. Logic high turns on Port 3 relay, logic low turns off Port 3 relay. A7: Relay 4 Enable. Logic high turns on Port 4 relay, logic low turns off Port 4 relay. The default setting is all bits set low. Register 2: Setup Register (Write Only) B0: Fault Clear Bit. Logic high clears any fault bits that are set. B1: Autoretry Enable Bit. Logic high enables autoretry following short-circuit faults. Logic low disables autoretry. B2: Open-Circuit Detect Enable Bit. Logic high enables and logic low disables open-circuit fault detection. B3: Retry Duty Cycle Select Bit. Logic high sets the autoretry duty cycle to 6%. Logic low sets the autoretry duty cycle to 0.83%. When autoretry is not enabled (B1 = low), the switch turn-on after A0 to A3 are set to high will be delayed to enforce the selected retry duty cycle. REGISTER DEFI ITIO S |
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