ASC7512 ETC2 [List of Unclassifed Manufacturers], ASC7512 Datasheet - Page 18

• Manufacturer Part Number: ASC7512
• Description: DIGITAL TEMPERATURE SENSOR WITH INTEGRATED FAN CONTROL
• Manufacturer: ETC2 [List of Unclassifed Manufacturers]

© Andigilog, Inc. 2006
1:0
3:2
5:4
Bit
6
7
Measurement
Duration
Measurement
Dwell
Measurement
Blank
3-Wire
Enable
Tach Disable
Name
Table 8 Tachometer Configuration Register
R/W
R/W
R/W
R/W
R/W
R/W
Default
10
01
11
0
0
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The amount of fan rotation used for the tach measurement.
Assumes 2 pulse periods per rotation of fan.
00: ¼ Rotation – Tach Count x4 = Reported Value
01: ½ Rotation – Tach Count x2 = Reported Value
10: 1 Rotation – Tach Count x1 = Reported Value (default)
11: 2 Rotation – Tach Count x1 = Reported Value
Delay between Tach Measurements
00: 100 ms
01: 300 ms (default)
10: 500 ms
11: 728 ms
In 3-wire fan mode, a delay is needed to assure that the
tach input has stabilized after the PWM has been set to
100%
00: 11.1 µs
01: 22.2 µs
10: 33.3 µs
11: 44.4 µs (default)
When high, forces the PWM to stay high for the duration of
a tach measurement for a 3-wire fan. This will result in
increasing the PWM on-time percentage vs. the value in
the PWM register.
Suspends the 90KHz clock for power savings when high.
- 18 -
Description
August 2006 - 70A05003
aSC7512