USB82640 datasheet(14/64 Pages) MICROCHIP

14 / 64 page

USB82640

DS60001312A-page 14

 2010-2015 Microchip Technology Inc.

REG_EN

IPU

Regulator Enable

This pin is internally pulled up to enable the

internal 1.8 V regulators. In order to disable the

regulators, this pin will need to be externally

connected to ground.

When the internal regulator is enabled, the

1.8 V power pins must be left unconnected,

except for the required bypass capacitors.

N/A

RESET_N

RESET input

This active low signal is used by the system to

reset the chip. The active low pulse should be at

least 1 µs wide.

N/A

TEST[2:0]

IPD

TEST Input

Tie these test pins to ground for normal opera-

tion.

Connect to

ground.

Digital/Power/Ground

VDD18

1.8 V Digital Core Power Bypass

This pin requires an external bypass capacitor

of 1.0 µF.

If REG_EN is low, this pin serves as a power

supply (1.8 V) for the device.

VDD33

3.3 V Power and Regulator Input

Pin 16 requires an external bypass capacitor of

4.7 µF minimum.

VDD33 (OTP)

3.3 V Power

VSS

ePad

Ground Pad

The ground pad is the only VSS for the device

and must be tied to ground with multiple vias.

NC(2)

No Connects

No trace or signal should be routed/attached to

these pins.

Leave open

TABLE 5-1:

USB82640 PIN DESCRIPTIONS (CONTINUED)

Symbol

48-Pin

VQFN

Buffer

Type

Description

If Pins not Used

Connection

USB82640 数据表(PDF) 14 Page - Microchip Technology

USB82640 数据表(HTML) 14 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64

数据表下载