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UCS81003 Datasheet(PDF) 60 Page - Microchip Technology |
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UCS81003 Datasheet(HTML) 60 Page - Microchip Technology |
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60 / 108 page  UCS81003 DS20005334A-page 60 2014 Microchip Technology Inc. 10.5 Current Limit Register The Current Limit register controls the ILIM used by the port power switch. The default setting is based on the resistor on the COMM_SEL/ILIM pin and this value cannot be changed to be higher than hardware set value. The contents of this register are retained in Sleep. 10.6 Charge Rationing Threshold Registers The Charge Rationing Threshold registers set the maximum allowed charge that will be delivered to a portable device. Every time the Total Accumulated Charge registers are updated, the value is checked against this limit. If the value meets or exceeds this limit, the RATION bit is set (see Section 10.4.1 “General Configuration Register”) and action taken according to the RATION_BEH<1:0> bits (see Section 10.4.1 “General Configuration Register”). The units are in mAh, with a range from 0 to ~218429. The contents of this register are retained in Sleep. Name Bits Address Cof Default Current Limit 8 19h R/W 00h REGISTER 10-13: CURRENT LIMIT REGISTER (ADDRESS 19H) U-x U-x U-x U-x U-x R/W-0 R/W-0 R/W-0 — — — — —ILIM_SW<2:0> bit 7 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown bit 7-3 Unimplemented bit 2-0 ILIM_SW<2:0>: Sets the ILIM value as follows: 000 = 0.57A 001 = 1.00A 010 = 1.13A 011 = 1.35A 100 = 1.68A 101 = 2.05A 110 = 2.28A 111 = 2.85A (3.0A maximum) Note 1: Unless otherwise indicated, the values specified above are the typical ILIM in the Table 1-2. Name Bits Address Cof Default Charge Rationing Threshold High Byte 81Ah R/W FFh Charge Rationing Threshold Low Byte 81Bh R/W FFh REGISTER 10-14: CHARGE RATIONING THRESHOLD (ADDRESS 1AH - 1BH) R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 CHTHR<15> CHTHR<14> CHTHR<13> CHTHR<12> CHTHR<11> CHTHR<10> CHTHR<9> CHTHR<8> bit 15 bit 8 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 CHTHR<7> CHTHR<6> CHTHR<5> CHTHR<4> CHTHR<3> CHTHR<2> CHTHR<1> CHTHR<0> bit 7 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown bit 15-0 CHTHR<15:1>: Charge Rationing Threshold LSB = 3.333 mAh |
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