USB5534B datasheet(10/73 Pages) MICROCHIP

10 / 73 page

USB5534B

DS00001681C-page 10

 2012 - 2015 Microchip Technology Inc.

TCK

JTAG Clock

This input is used for JTAG boundary scan and has a weak pull-down.

It can be left floating or grounded when not used. If the JTAG is

connected, then this signal will be detected high, and the software

disables the pull up after reset.

Note:

Only available in test mode.

OCS1

Over-Current Sense 1

Input from external current monitor indicating an over-current condition.

Note:

This pin also provides configuration strap functions.

See Note 3-3.

TMS

JTAG TMS

Used for JTAG boundary scan.

Note:

Only available in test mode.

OCS2

Over-Current Sense 2

Input from external current monitor indicating an over-current condition.

Note:

This pin also provides configuration strap functions.

See Note 3-3.

TDI

JTAG TDI

Used for JTAG boundary scan.

Note:

Only available in test mode.

OCS3

Over-Current Sense 3

Input from external current monitor indicating an over-current condition.

Note:

This pin also provides configuration strap functions.

See Note 3-3.

TDO

O12

JTAG TDO

Used for JTAG boundary scan.

Note:

Only available in test mode.

OCS4

Over-Current Sense 4

Input from external current monitor indicating an over-current condition.

Note:

This pin also provides configuration strap functions.

See Note 3-3.

MISC

RESET_N

Reset Input

The system uses this active low signal to reset the chip. The active low

pulse should be at least 1

s wide.

XTALIN

ICLKx

Crystal Input: 25 MHz crystal.

This pin connects to either one terminal of the crystal or to an external

25 MHz clock when a crystal is not used.

CLK_IN

External Clock Input

This pin connects to either one terminal of the crystal or to an external

25 MHz clock when a crystal is not used.

XTALOUT

OCLKx

Crystal Output

The clock output, providing a crystal 25 MHz. When an external clock

source is used to drive XTALIN/CLK_IN, this pin becomes a no

connect.

TABLE 3-1:

USB5534B PIN DESCRIPTIONS (CONTINUED)

Symbol

Buffer Type

Description

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