TMC2005 datasheet(9/32 Pages) SMSC

9 / 32 page

SMSC DS – TMC2005

Page 9

Rev. 10/24/2000

Operating Mode Setup

FEATURE

NAME

INPUT/

OUTPUT

DESCRIPTION

Data rate

setup

CKM [0:2]

INPUT

Terminal to setup the data rate of TMC2005.

CKM2 CKM1 CKM0 DIVISOR MULTIPLIER

SPEED

156.25 Kbps

312.5 Kbps

625 Kbps

1.25 Mbps

2.5 Mbps

5 Mbps

Reserved

10 Mbps

External clock is 20MHz.

Refer to “VARIOUS SETUP”

Noise cut

mode

nMBA

nMBB

nMBE

INPUT

0: Cut off noise from received data

1: Don’t cut off noise

Setup “0” normally.

Big jitter

mode

nBJA

nBJB

nBJE

INPUT

Setup a jitter filter feature.

Select a pulse as reference phase used by DPLL.

0: 2

nd pulse (big jitter mode)

1: 1

st pulse (normal mode)

Open drain

mode

nEXTOD

INPUT

Setup a the use of EXTTX port.

0: Set EXTTX as open drain output and use as Ext.

1: Set EXTTX as normal output and use as 5

th port.

PLL

FEATURE

NAME

INPUT/

OUTPUT

DESCRIPTION

OUTPUT

Using PLL: Connect to an external condenser “C1”

for loop filter.

Using no PLL: must be open.

OUTPUT

VCO output

Using PLL: Connect to an external resistor “R0” for

loop filter.

Using no PLL: must be open.

AGS

INPUT

Analog sense input.

Using PLL: Connect to loop filter.

Using no PLL: Connect to ground.

nPLLTST

INPUT

Test pin for PLL.

Must always connect to VDD.

AVDD

Analog power supply

Using PLL: Analog power supply. There are some

limits on PCB pattern.

Using no PLL: Power supply (+5V) same as VDD1~6.

AVSS

Analog ground

Using PLL: Analog ground. There are some limits on

PCB pattern.

Using no PLL: Use a ground same as VSS1~8.

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