UCS1002-2 datasheet(97/114 Pages) MICROCHIP

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Programmable USB Port Power Controller with Charger Emulation

Datasheet

SMSC UCS1002

Revision 1.4 (07-16-13)

DATASHEET

10.12.5

Emulation Stimulus X - Config 3 - 33h, 37h, 3Bh

The contents of this register are retained in Sleep.

APPLICATION NOTE: The Legacy charger emulation profiles do not use these settings. Whenever a Legacy

charger emulation profile is applied within the DCE Cycle, these controls will not be updated

and should be ignored. These settings are only used by the BC1.2 CDP and DCP charger

emulation profiles.

Bits 5 - 4 - SX_PUPD[1:0] - Determines the magnitude of the pull-down current applied on the DPOUT

and DMOUT pins when the stimulus response is to apply a voltage and the voltage magnitude is set

at pull-down (0000b). The bit decode is given in Table 10.34.

Bits 3 - 0 - SX_TH[3:0] - Defines the threshold value, as shown in Table 10.35, for the specified

stimulus. If the stimulus is VBUS voltage is ready to be applied or applied (i.e., STIMX[2:0] = 000b or

111b), the threshold value is ignored.

0111

700 mV

1000

800 mV

1001

900 mV

1010

1400 mV

1011

1600 mV

1100

1800 mV

1101

2000 mV

1110

2200 mV

1111

Do not use

Table 10.34 Pull-Down Magnitude

SX_PUPD

PULL-DOWN CURRENT

μA

100

μA

150

μA

Table 10.33 Stimulus Response Voltage Options (continued)

SX_RXMAG[3:0] SETTING

VOLTAGE ON DPOUT / DMOUT

3210

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