f75363 Feature Integration Technology Inc., f75363 Datasheet - Page 20

• Manufacturer Part Number: f75363
• Description: ?1o C Accuracy Temperature Sensor Ic With Fan Speed Control
• Manufacturer: Feature Integration Technology Inc.

F75363
8. PCB Layout Guide
PCB can be electrically noisy environments, and the F75363 is measuring very small voltage from the
remote sensor, so care must be taken to minimize noise which is occurred at the sensor inputs. The
following guideline should be taken to reduce the measurement error of the temperature sensors:
1. Place the F75363 as close as practical to the remote sensing diode. In noisy environments, such as a
2. Route the D+ and D- tracks close together, in parallel, with grounded guard tracks on each side.
computer main-board, the distance can be 4 to 8 inches. (typ). This length can be increased if the
worst noise sources are avoided. Noise sources generally include switching power plane, clock
generators, CRTs, memory buses and PCI/ISA bus etc.
Provide a ground plane under the tracks if possible. Do not route D+ & D- lines next to the deflection
coil of the CRT. And also don’t route the trace across fast digital signals which can easily induce
bigger error.
The value in quota is its power-on default value.
Description
T1 reading
T2 reading
T1 High Limit
T1 Low Limit
T2 High Limit
T2 Low Limit
T1 thermal limit
T1 thermal Hysteresis
T2 thermal limit
T2 thermal Hysteresis
FAN Tachometer Count
FAN Tachometer Limit
Attribute
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
RO
RO
RO
Address(High Byte)
-16-
05h/0Bh
06h/0Ch
07h/0Dh
08h/0Eh
23h
21h
47h
49h
20h
19h
00h
01h
(0Ah)
(0Ah)
(FFh)
(FFh)
(55h)
(64h)
(46h)
(00h)
(55h)
(00h)
Address (Low Byte)
46h
48h
1Ch
1Bh
13h
14h
1Ah
10h
(FFh)
(FFh)
(00h)
(00h)
(00h)
(00h)
F75363
July, 2007
V0.27P