UCS2112 datasheet(6/64 Pages) MICROCHIP

6 / 64 page

UCS2112

DS20005424B-page 6

 2015 Microchip Technology Inc.

Thermal Shutdown

Threshold

TTSD

—

135

—

°C

Die Temperature at which port

power switch will turn off

Thermal Shutdown

Hysteresis

TTSD_HYST

—

°C

After shutdown due to TTSD

being reached, die temperature

drop required before port power

switch can be turned on again

Auto-recovery Test Current

ITEST

—

190

—

Portable device attached,

VBUS= 0 V, Die temp < TTSD

Auto-recovery Test Voltage

VTEST

—

750

—

Portable device attached,

VBUS = 0 V before application,

Die temp < TTSD

Programmable, 250 - 1000 mV,

default listed

Discharge Impedance

RDISCHARGE

—

100

—



Port Power Switch - AC Parameters

Turn-On Delay

tON_PSW

—

200

—

Depends on the VBUS Discharge

setting.

Programmable 100-400 ms,

default listed

Turn-Off Time

tOFF_PSW_INA

—

0.75

—

PWR_EN inactive toggle to

switch off time

CBUS = 120 µF

Turn-Off Time

tOFF_PSW_ERR

—

Over-current Error, VBUS Min

Error, or Discharge Error to

switch off

CBUS = 120 µF

Turn-Off Time

tOFF_PSW_ERR1

—

100

—

TSD or Back-drive Error to

switch off

CBUS = 120 µF

VBUS Output Rise Time

tR_BUS

—

1.1

—

Measured from 10% to 90% of

VBUS, CLOAD = 220 µF

ILIM = 1.0A

Soft Turn-On Rate

IBUS/t

—

100

—

mA/µs

Temperature Update Time

tDC_TEMP

—

200

—

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

TABLE 1-2:

ELECTRICAL SPECIFICATIONS (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 105°C. All typical values at VDD = VS = 5V, TA = 27°C.

Characteristic

Symbol

Min.

Typ.

Max.

Unit

Conditions

Note

This parameter is characterized, not 100% tested.

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

The current measurement full scale range maximum value is 3.4A. However, the UCS2112 cannot report values above

ILIM (if IBUS_R2MIN  ILIM) or above IBUS_R2MIN (if IBUS_R2MIN > ILIM and ILIM  1.6A).

This parameter is characterized, not 100% production tested.

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