Operating Mode Setup
FEATURE
Data rate
setup
NAME
CKM [0:2]
INPUT/
OUTPUT
INPUT
DESCRIPTION
Terminal to setup the data rate of TMC2005.
CKM2 CKM1 CKM0 DIVISOR
0
0
0
16
0
0
1
8
0
1
0
4
0
1
1
2
1
0
0
1
1
0
1
1
1
1
0 Reserved
1
1
1
1
External clock is 20MHz.
Refer to “VARIOUS SETUP”
MULTIPLIER SPEED
x1
156.25 Kbps
x1
312.5 Kbps
x1
625 Kbps
x1
1.25 Mbps
x1
2.5 Mbps
x2
5 Mbps
Reserved
Reserved
x4
10 Mbps
Noise cut
mode
nMBA
nMBB
nMBE
nBJA
nBJB
nBJE
INPUT
0: Cut off noise from received data
1: Don’t cut off noise
Setup “0” normally.
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)
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.
Big jitter
mode
INPUT
Open drain
mode
nEXTOD
INPUT
PLL
FEATURE
NAME
LP
INPUT/
OUTPUT
OUTPUT
DESCRIPTION
Using PLL: Connect to an external condenser “C1”
for loop filter.
Using no PLL: must be open.
VCO output
Using PLL: Connect to an external resistor “R0” for
loop filter.
Using no PLL: must be open.
Analog sense input.
Using PLL: Connect to loop filter.
Using no PLL: Connect to ground.
Test pin for PLL.
Must always connect to VDD.
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.
Analog ground
Using PLL: Analog ground. There are some limits on
PCB pattern.
Using no PLL: Use a ground same as VSS1~8.
RO
OUTPUT
AGS
INPUT
nPLLTST
AVDD
INPUT
AVSS
SMSC DS – TMC2005
Page 9
Rev. 10/24/2000
SMSC [ SMSC CORPORATION ]
