UCS1003-2 datasheet(11/138 Pages) MICROCHIP

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DS20005346B-page 11

UCS1003-1/2/3

Short-Circuit Response Time

tSHORT_LIM

—

1.5

—

µs

Time from detection of short to

current limit applied; no CBUS

applied

Short-Circuit Detection Time

tSHORT

—

Time from detection of short to

port power switch disconnect

and ALERT# pin assertion

Latched Mode Cycle Time

tUL

—

From PWR_EN edge transition

from inactive to active to begin

error recovery

Auto-Recovery Mode

Cycle Time

tCYCLE

—

Time delay before error

condition check, programmable

(UCS1003-1 only)

10-25 ms,

default listed

Auto-Recovery Delay

tRST

—

Portable device attached, VBUS

must be

 VTEST after this time,

programmable (UCS1003-1

only)

10-25 ms, default listed

Discharge Time

tDISCHARGE

—

200

—

Amount of time discharge

resistor applied, programmable

(UCS1003-1 only)

100-400 ms,

default listed

Port Power Switch Operation with Trip Mode Current Limiting

Region 2 Current Keep-out

IBUS_R2MIN

—0.12

—

Minimum VBUS Allowed at

Output

VBUS_MIN

1.5

2.0

2.25

Port Power Switch Operation with Constant-Current Limiting (Variable Slope)

Region 2 Current Keep-out

IBUS_R2MIN

—1.68

—

Minimum VBUS Allowed at

Output

VBUS_MIN

1.5

2.0

2.25

Current Measurement (UCS1003-1 only) – DC

Current Measurement Range

IBUS_M

—

2988.6

Range 0-255 LSB (Note 4)

Reported Current

Measurement Resolution

DIBUS_M

—

11.72

—

1 LSB

Current Measurement

Accuracy

—±2

—

180 mA < IBUS < ILIM

—±2

—

LSB

IBUS < 180 mA

Current Measurement (UCS1003-1 only) – AC

Sampling Rate

—

500

—

µs

TABLE 1-2:

ELECTRICAL CHARACTERISTICS (CONTINUED)

Electrical Characteristics:

Unless otherwise specified, VDD = 4.5V to 5.5V, VS = 2.9V to 5.5V, VPULLUP = 3V to 5.5V,

TA = -40°C to +85°C; all Typical values at VDD = VS = 5V, TA = +27°C.

Characteristic

Sym.

Min.

Typ.

Max.

Unit

Conditions

Note 1:

For split supply systems using the Attach Detection feature, VS must not exceed VDD +150 mV.

This parameter is ensured by design and not 100% tested.

This parameter is characterized, but not 100% production tested.

The current measurement full-scale range maximum value is 3.0A. However, the UCS1003-1 cannot report

values above ILIM (if IBUS_R2MIN  ILIM) or above IBUS_R2MIN (if IBUS_R2MIN > ILIM and ILIM 1.68A).

The Min and Max values represent the boundaries of a programmable range for UCS1003-1 only. Each value

in the range is typical.

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