UCS2113 datasheet(50/62 Pages) MICROCHIP

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UCS2113

DS20005680B-page 50

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8.8

Current Limit Behavior Registers

The Current Limit Behavior register stores the values

used by the applied current limiting mode (Trip or CC).

The contents of this register are not retained in Sleep.

PORT 1 CURRENT LIMIT BEHAVIOR REGISTER (ADDRESS 23H)

R/W-1

R/W-0

R/W-1

R/W-0

R/W-1

R/W-0

SEL_VBUS1_MIN<1:0>

DISCHG_LOAD1

SEL_R2_IMIN1<2:0>

Reserved

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 7-6

SEL_VBUS1_MIN<1:0>: Define the VBUS_MIN voltage for Port 1 as follows:

00 = 1.50V

01 =1.75V

10 =2.0V

11 =2.25V

bit 5

DISCHG_LOAD1: Connects the internal 100Ω load to discharge VBUS1 (Note 1). The SMBus host must

set this bit to discharge VBUS1 if the EN_VBUS_DISCHG bit from the General Configuration 2 register

12h is '0'. This functionality doesn't use any timer. The discharge time is controlled by the SMBus host,

which must clear this bit when its internal timer expires. The difference from DSCHG1 bit from the

General Configuration 1 register 11h is that, when that bit is set, the discharge time is controlled by the

UCS2113 internal timer.

The state of this bit is ignored when the EN_VBUS_DISCHG bit from the General Configuration 2

bit 4-2

SEL_R2_IMIN1<2:0>: Defines the IBUS_R2MIN current

000 =100 mA

001 =530 mA

010 =960 mA

011 =1280 mA

100 =1600 mA

101 =2130 mA

bit 1-0

Reserved: Do not change

Note 1: If the corresponding power switch is still turned on (PWR_EN1 control is active) while DISCHG_LOAD1 bit

is set, the internal 100Ω load will be connected in parallel with the load on the VBUS1 pins.

PORT 2 CURRENT LIMIT BEHAVIOR REGISTER (ADDRESS 24H)

R/W-1

R/W-0

R/W-1

R/W-0

R/W-1

R/W-0

SEL_VBUS2_MIN<1:0>

DISCHG_LOAD2

SEL_R2_IMIN2_MIN<2:0>

Reserved

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 7-6

SEL_VBUS2_MIN<1:0>: Define the VBUS_MIN voltage for Port 2 as follows:

00 = 1.50V

01 =1.75V

10 =2.0V

11 =2.25V

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