1425A—09/02/09

ICS9UMS9633BW

ULTRA MOBILE PC CLOCK FOR AUTOMOTIVE USE

8

Datasheet

Table 1: CPU Frequency Select Table

1

1

CPU

MHz

SRC

MHz

DOT

MHz

LCD

MHz

REF

MHz

0

0

133.33

0

1

166.67

1

0

100.00

11

66.67

1. FS

the Input/Supply/Common Output Parameters Table for correct values.

Also refer to the Test Clarification Table.

100.00

96.00

100.00

14.318

Table 2: LCD Spread Select Table (Pin 20/21)

B1b5

B1b4

B1b3

Spread

%

Comment

0

0

0

-0.5%

LCD100

0

0

1

-1%

LCD100

0

1

0

-2%

LCD100

0

1

1

-2.5%

LCD100

1

0

0

+/- 0.25%

LCD100

1

0

1

+/-0.5%

LCD100

1

1

0

+/-1%

LCD100

1

1

1

+/-1.25%

LCD100

0

1

Enable

Running Running

1

X

Enable

Low/20K

Low

0

0

Enable

High

Low

0X

Disable

Low/20K

Low

0

0

Enable

Running Running

Running

Running

1

X

X

Low/20K

Low

Low/20K

Low

0

1

Enable

Low/20K

Low

Running

Running

0X

Disable

Low/20K

Low

Low/20K

Low

REF Power Management Table

0

Enable

Running

1

X

Low

0

Disable

Low

REF

PD

SMBus Register

OE

DOT/LCD DOT#/LCD#

PD

CR_x#

SMBus Register

OE

SRC

SRC#

SRC, LCD, DOT Power Management Table

CPU Power Management Table

PD

CPU_STOP#

SMBus Register

OE

CPU

CPU#

Table 3: CPU N-step Programming

CPU

(MHz)

P

Default N

(hex)

133.33

3

64

166.67

3

7D

100.00

4

64

200.00

2

64

= 4MHz x N/P

= 4MHz x N/P

Fcpu

= 4MHz x N/P

= 4MHz x N/P