FAN5355UC07X Fairchild Semiconductor, FAN5355UC07X Datasheet - Page 23

• Manufacturer Part Number: FAN5355UC07X
• Description: Fan5355 1a / 0.8a, 3mhz Digitally Programmable Tinybucktm Regulator
• Manufacturer: Fairchild Semiconductor

© 2008 Fairchild Semiconductor Corporation
FAN5355 • Rev. 1.0.4
Register Descriptions
Default Values
Each option of the FAN5355 (see Ordering Information on page 2) has different default values for the some of the register bits.
Table 12 defines both the default values and the bit’s type (as defined in Table 13) for each available option.
Table 12. Default Values and Bit Types for VSEL and CONTROL Registers
Table 13. Bit Type Definitions for Table 12.
#
#
#
Option
Active bit.
Disabled.
Read-only .
Option
00
02
03
07
06
00, 02
06, 07
03
7
1
1
1
1
1
Changing this bit changes the behavior of the converter, as described below.
Converter logic ignores changes made to this bit. Bit can be written to and read-back.
Writing to this bit through I
6
1
1
1
1
1
7
1
0
1
CONTROL1
5
0
0
0
0
1
6
0
0
0
VSEL0
4
1
1
1
1
1
5
0
0
0
3
1
1
0
1
0
4
1
1
1
2
0
0
1
0
0
2
3
0
0
0
C does not change the read-back value, nor does it change converter behavior.
1
0
0
0
0
0
2
0
0
0
0
0
0
0
0
1
1
0
0
0
V
1.05
1.05
1.00
1.05
1.80
OUT
0
0
0
0
23
Option
00
02
03
07
06
Option
00, 02
06, 07
03
7
1
1
1
1
1
6
1
1
1
1
1
7
0
0
0
5
1
1
1
1
1
CONTROL2
6
0
0
0
VSEL1
4
1
0
0
1
1
5
0
0
0
3
0
0
0
0
0
4
0
0
0
2
0
1
1
0
0
3
0
0
0
1
0
0
0
0
0
www.fairchildsemi.com
0
0
0
0
0
1
2
1
1
1
1
1
1
1
V
1.35
1.20
1.20
1.35
1.80
OUT
0
1
1
1