UCS81003 datasheet(95/108 Pages) MICROCHIP

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 2014 Microchip Technology Inc.

DS20005334A-page 95

UCS81003

11.0

COMMUNICATIONS

11.1

Operating Mode

The UCS81003 can operate in SMBus mode (see

Section 11.2 “SMBus Operating Mode”) or Stand-

Alone

mode

(see

Section 11.3

“Stand-Alone

Operating

Mode”).

The

resistor

the

COMM_SEL/ILIM pin determines the operating mode

and the hardware-set ILIM setting, as shown in

Table 11-1. Unless connected to GND or VDD, the

resistors in Table 11-1 are pull-down resistors.

11.2

SMBus Operating Mode

When the COMM_SEL/ILIM pin is connected directly to

ground or though a pull-down resistor with a value of

33 k

 or below as listed in Table 11-1, the UCS81003

communicates via the SMBus or I2C communications

protocols.

Note:

necessary

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:

UCS81003 COMMUNICATION MODE AND ILIM SELECTION (Note 1)

SELECTION Resistor ±5%

ILIM Setting

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 table are the typical ILIM in Table 1-2.

Note 1: Upon power-up, the UCS81003 will not

respond to any SMBus communications

for

5.5 ms.

After

this

time,

full

functionality is available.

2: When in the Sleep state, the first SMBus

read command sent to the UCS81003

device address will wake it. Any data sent

to the UCS81003 will be ignored and any

data read from the UCS81003 should be

considered invalid. The UCS81003 will

be fully functional 3 ms after this first read

command is sent. See Section 5.1.2

“Sleep State Operation”.

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