UCS1002-2 datasheet(27/114 Pages) MICROCHIP

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Programmable USB Port Power Controller with Charger Emulation

Datasheet

SMSC UCS1002

Revision 1.4 (07-16-13)

DATASHEET

Chapter 4 Communications

4.1

Operating Mode

The UCS1002 can operate in SMBus mode (see Section 4.2, "SMBus Operating Mode") or Stand-

alone mode (see Section 4.3, "Stand-alone Operating Mode"). The resistor on the COMM_SEL / ILIM

pin determines operating mode and the hardware-set ILIM setting, as shown in Table 4.1. Unless

connected to GND or VDD, the resistors in Table 4.1 are pull-down resistors.

APPLICATION NOTE: If it is necessary to connect the COMM_SEL / ILIM pin to VDD via a pull-up resistor, it is

recommended that this resistor value not exceed 100 k

Ω.

Table 4.1 UCS1002 Communication Mode and ILIM Selection

SELECTION RESISTOR ±5%

ILIM SETTING

COMMUNICATIONS MODE

GND

500 mA

SMBus - see Section 4.2.1.2

10 k

Ω pull-down

900 mA

SMBus - see Section 4.2.1.2

12 k

Ω pull-down

1000 mA

SMBus - see Section 4.2.1.2

15 k

Ω pull-down

1200 mA

SMBus - see Section 4.2.1.2

18 k

Ω pull-down

1500 mA

SMBus - see Section 4.2.1.2

22 k

Ω pull-down

1800 mA

SMBus - see Section 4.2.1.2

27 k

Ω pull-down

2000 mA

SMBus - see Section 4.2.1.2

33 k

Ω pull-down

2500 mA

SMBus - see Section 4.2.1.2

47 k

Ω pull-down

500 mA

Stand-alone mode

56 k

Ω pull-down

900 mA

Stand-alone mode

68 k

Ω pull-down

1000 mA

Stand-alone mode

82 k

Ω pull-down

1200 mA

Stand-alone mode

100 k

Ω pull-down

1500 mA

Stand-alone mode

120 k

Ω pull-down

1800 mA

Stand-alone mode

150 k

Ω pull-down

2000 mA

Stand-alone mode

VDD

(If a pull-up resistor is used, its

value must not exceed 100 k

Ω.)

2500 mA

Stand-alone mode

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