UCS1003-3 datasheet(130/138 Pages) MICROCHIP

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UCS1003-1/2/3

DS20005346B-page 130

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11.3

Stand-Alone Operating Mode

Stand-Alone mode allows the UCS1003-1 to operate

without active SMBus/I2C communications. Stand-Alone

mode can be enabled by connecting a pull-down resistor,

greater or equal to 47 k

 on the COMM_SEL/ILIM pin, as

shown in Table 11-1.

When the device is configured to operate in Stand-

Alone mode, the Fault handling and Attach Detection

controls are determined via the LATCH and S0 pins, as

shown in Table 11-10.

Note:

If it is necessary to connect the S0 or

LATCH pins to VDD via a pull-up resistor,

the pull-up resistor value should be

100 k

 in order to ensure the VIH

specification. Similarly, if it is necessary to

connect the S0 or LATCH pins to GND via

a pull-down resistor, the pull-down resistor

value should be 100 k

 in order to ensure

the VIL specification.

TABLE 11-10: STAND-ALONE FAULT AND ATTACH DETECTION SELECTION

LATCH Pin

S0 Pin

Command

Low

No Attach Detection. Auto-recovery upon Error Detection.

Low

High

Attach Detection in the Detect power state. Auto-recovery upon Error Detection.

High

Low

No Attach Detection. Error states are latched and require host to change the

PWR_EN control to recover from the Error state.

High

Attach Detection in the Detect power state. Error states are latched and

require host to change the PWR_EN control to recover from the Error state.

Note:

In the Stand-Alone operating mode, communications from and to the UCS1003-1 are limited to the

PWR_EN, EM_EN, M2, M1, ALERT# and A_DET# pins.

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