UCS1003-2 datasheet(125/138 Pages) MICROCHIP

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DS20005346B-page 125

UCS1003-1/2/3

11.0

UCS1003-1 COMMUNICATIONS

11.1

Operating Mode

The UCS1003-1 can operate in SMBus mode (see

Section 11.2

“SMBus

Operating

Mode”

)

Stand-Alone mode (see Section 11.3 “Stand-Alone

Operating Mode”

). The resistor on the COMM_SEL/ILIM

pin determines the operating mode and the hardware

ILIM setting, as shown in Table 11-1. Unless connected to

GND or VDD, the resistors in Table 11-1 are pull-down

resistors.

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

.

TABLE 11-1:

UCS1003-1 COMMUNICATION MODE AND ILIM SELECTION

Selection Resistor ±5%

ILIM Setting

(1)

Communications Mode

GND

570 mA

SMBus – see Section 11.2.1.2

10 k

 pull-down

1000 mA

SMBus – see Section 11.2.1.2

12 k

 pull-down

1130 mA

SMBus – see Section 11.2.1.2

15 k

 pull-down

1350 mA

SMBus – see Section 11.2.1.2

18 k

 pull-down

1680 mA

SMBus – see Section 11.2.1.2

22 k

 pull-down

2050 mA

SMBus – see Section 11.2.1.2

27 k

pull-down

2280 mA

SMBus – see Section 11.2.1.2

33 k

 pull-down

2850 mA (3000 mA maximum)

SMBus – see Section 11.2.1.2

47 k

 pull-down

570 mA

Stand-Alone mode

56 k

 pull-down

1000 mA

Stand-Alone mode

68 k

 pull-down

1130 mA

Stand-Alone mode

82 k

 pull-down

1350 mA

Stand-Alone mode

100 k

 pull-down

1680 mA

Stand-Alone mode

120 k

 pull-down

2050 mA

Stand-Alone mode

150 k

 pull-down

2280 mA

Stand-Alone mode

VDD (If a pull-up resistor is used, its

value must not exceed 100 k

.)

2850 mA (3000 mA maximum)

Stand-Alone mode

Note 1:

Unless otherwise indicated, the values specified in this column are the typical ILIM in the Table 1-2.

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