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SP7680EB Datasheet(PDF) 11 Page - Sipex Corporation |
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SP7680EB Datasheet(HTML) 11 Page - Sipex Corporation |
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11 / 16 page  June 21-07 revH SP7680: Complete Backlight Solution 2007 Sipex Corporation Page 11 *When WZ=0 and WP=0 all registers are set to zero. Bits B5, B4, B3, B2 and B1 are for read back only. Bit B5 is held high whenever any kind of fault condition exists on the SP7680. Bits B4, B3 and B2 indicate the specific fault condition, over-voltage (B4=1), over-temp (B3=1) or undervoltage lockout (B2=1). B1 communicates the state of the charge pump, (B1=1 for 1.5x mode or B1=0 for 1x mode). B0 of the STATUS register is used to select between automatic charge pump mode selection and forced charge pump mode selection. If B0 is low then the charge pump mode (1X or 1.5X) is automatically selected. If B0 is high then the charge pump is forced into either 1X mode or 1.5X mode depending upon B0 of the CNTRL register. Fault Conditions For all three fault conditions: Under Voltage Lockout Over Temperature Detection Over Voltage Protection Upon entering any of these fault modes, the LED drivers should turn off but the register contents should remain unchanged with the exception of the fault mode readback bits of the status register. The WZ and WP bits of the status register should also remain unchanged. The microprocessor should not have to reset the SP7680 if it goes into fault mode. The chip should continuously monitor its fault indicators and when the fault condition is no longer present, normal operation can resume. CNTRL Register In the CNTRL register B1, B2, B3 and B4 are used to control the four MAIN LEDs, bits B5 and B6 are used for the two SUB LEDs, and B7 is used for the AUX LED. To enable an individual LED the corresponding bit is active high. When B0 of the STATUS register is high, B0 of the CNTRL register is used to force the charge pump into 1X mode (CNTRL B0=low) or 1.5X mode (CNTRL B0=high). When B0 of the STATUS register is low then CNTRL B0 is ignored. WZ WP State Iq LED drivers 0 0 Shutdown and reset registers to 00000000 0uA Off 0 1 Shutdown - keep register contents 0uA Off 1 0 Standby - keep register contents – bandgap and other analog circuits active, Vin shorted to Vout through internal switch 200uA Off 1 1 Active Active Iq On APPLICATIONS INFORMATION |
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