UPD1001 datasheet(13/42 Pages) MICROCHIP

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 2014 Microchip Technology Inc.

DS00001759B-page 13

UPD1001

Source

Voltage

Select 2

VSEL2_N

OD8

This active low signal is one in a series of output pins

(VSEL0_N, VSEL1_N, VSEL2_N, and VSEL3_N) used to

select the correct source voltage from the DC-to-DC solu-

tion. Each VSELx_N pin is dedicated to one voltage,

assigned in order of increasing supported voltage.

Refer to the VSEL0_N definition for additional informa-

tion.

Note:

This function is only available in specific

device configurations.

Source

Voltage

Select 3

VSEL3_N

OD8

This active low signal is one in a series of output pins

(VSEL0_N, VSEL1_N, VSEL2_N, and VSEL3_N) used to

select the correct source voltage from the DC-to-DC solu-

tion. Each VSELx_N pin is dedicated to one voltage,

assigned in order of increasing supported voltage.

Refer to the VSEL0_N definition for additional informa-

tion.

Note:

This function is only available in specific

device configurations.

VBUS

Discharge

VBUS_DISCHARGE

This active high output is used to drive a power NFET to

discharge VBUS during high-to-low voltage transitions in

order to achieve vSafe0V. When asserted, the external

MOSFET should conduct to GND through a current limit-

ing resistor. This signal de-asserts when the VMON sig-

nal voltage reaches a preset value (a percentage of the

destination voltage).

Emulation

Enable

CHG_EMU_EN

This active high output signal can be used to drive the

Emulation Enable pin of a Microchip UCS1001 or similar

device that supports BC 1.2. The device will assert this

signal whenever operating at VSafe5V without a PD con-

tract. Whenever a PD contract is established (even at

5 V), this signal is de-asserted.

Note:

This function is only available in specific

device configurations.

TABLE 2-2:

PIN DESCRIPTIONS (CONTINUED)

Name

Symbol

Buffer

Type

Description

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