UCS2112 datasheet(45/64 Pages) MICROCHIP

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 2015 Microchip Technology Inc.

DS20005424B-page 45

UCS2112

9.3

Configuration Registers

The Configuration registers control basic device

functionality. The contents of these registers are

retained in Sleep.

GENERAL CONFIGURATION 1 REGISTER (ADDRESS 11H)

R/W-0

R/W-1

R/W-0

ALERT1_MASK ALERT1_LINK

DSCHG1

PWR_EN1S

DISCHG_TIME<1:0>

ATT_TH1<1:0>

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit

C = Clear on Read

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 7

ALERT1_MASK:

Mask errors for all interrupts in Register 9-3 except OV_LIM1 and TSD.

= The ALERT#1 pin will only assert if a OV_LIM1 or TSD is detected.

= The ALERT#1 pin will be asserted if an error condition or indicator event is detected.

bit 6

ALERT1_LINK:

Links the ALERT#1 pin to be asserted when the LOW_CUR1 bit is set.

= The ALERT#1 pin will be asserted if the LOW_CUR1 indicator bit is set.

= The ALERT#1 pin will not be asserted if the LOW_CUR1 indicator bit is set.

bit 5

DSCHG1:

Forces the VBUS1 to be reset and discharged when the UCS2112 is in the Active state.

Writing this bit to a logic ‘1’ will cause the port power switch to be opened and the discharge circuitry

to activate and discharge VBUS. Actual discharge time is controlled by DISCHG_TIME<1:0>. This

bit is self-clearing.

=VBUS1 discharge initiated.

= Port 1 not in discharge

bit 4

PWR_EN1S:

Power Enable Port 1 override - This bit is OR’ed with the PWR_EN1 pin. Thus, if the

polarity is set to active-high, either the PWR_EN1 pin or this bit must be ‘1’ to enable the port power

switch.

bit 3-2

DISCHG_TIME<1:0>:

Discharge time Port 1 - sets tDISCHARGE. The discharge time value is the

same for both ports.

= 100 ms

= 200 ms

= 300 ms

= 400 ms

bit 1-0

ATT_TH1<1:0>:

Attach Detection Threshold Port 1 - determines the current draw needed to deter-

mine an Attach event has occurred. Also controls the Removal Detection current level (Note 1).

= 200 µA Attach/100 µA Removal

= 400 µA Attach/300 µA Removal

= 800 µA Attach/700 µA Removal

= 1000 µA Attach/900 µA Removal

Note 1:

The removal threshold is different when operating in the Active power state versus when operating in the

Detect power state.

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