參數(shù)資料
型號(hào)： ASC7512M8
廠商： Electronic Theatre Controls, Inc.
元件分類： 溫度/濕度傳感器
英文描述： DIGITAL TEMPERATURE SENSOR WITH INTEGRATED FAN CONTROL
中文描述： 數(shù)字溫度傳感器整合了風(fēng)扇控制
文件頁數(shù)： 25/35頁
文件大?。?/td> 337K
代理商： ASC7512M8
- 25 -
Andigilog, Inc. 2006
www.andigilog.com
August 2006 - 70A05003
aSC7512
Fan Configuration
ZON[2:0]
Fan on Zone 1 auto
000
Fan on Zone 2 auto
Reserved
001
010
Fan always on full
011
Fan disabled
100
Fan on Zone 2 auto
101
Fan controlled by hotter of zones 1 or 2
Fan manually controlled (Test Mode)
110
111
Table 15 Fan Zone Setting
Bit [4] PWM Invert
Bit [4] inverts the PWM output. If set to 0, 100% duty cycle will yield an output that is always high. If set to 1, 100% duty
cycle will yield an output that is always low.
Bit [3] Reserved
Bit [2:0] Spin Up
Bits [2:0] specify the ‘spin up’ time for the fan. When a fan is being started from a stationary state, the PWM output is held at
100% duty cycle for the time specified in the table below before scaling to a lower speed.
Spin Up Time
SPIN[2:0]
0 ms
000
100 ms
001
250 ms
010
400 ms
011
700 ms
100
1000 ms
2000 ms
101
110
4000 ms
111
Table 16 Fan Spin-Up Register
Register 62, 63h: Min/Off, Spike Smoothing
Register
Address
Read/
Write
Register
Name
Bit 7
(MSB)
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
(LSB)
Default
Value
Lock
62h
R/W
Min/Off,
Zone1 Spike
Smoothing
RES
RES
OFF
RES
ZN1E
ZN1-2
ZN1-1
ZN1-0
00
X
63h
R/W
Zone2 Spike
Smoothing
ZN2E
ZN2-2
ZN2-1
ZN2-0
RES
RES
RES
RES
00
X
The Off/Min Bit 5 specifies whether the duty cycle will be 0% or Minimum Fan Duty when the measured temperature falls
below the Temperature LIMIT register setting (see Table 18 below).
If the Remote pins are connected to a processor or chipset, instantaneous temperature spikes may be sampled by the
aSC7512. Fan speed algorithm has two phases of filtering on temperature zone readings. First, a “No-Spike” value is
created from the current temperature and three previous readings. This is an average of the two remaining values when the
high and low values are removed. This is the temperature used to determine PWM and is always running.
The second phase is a user specified filter and coefficient. This filter determines a smoothed temperature value, Smooth T
i
,
by taking the No-Spike T
i
, subtracting the previous smoothed temperature, Smooth T
i-1
, divided by 2^N and adding that to
the previously smoothed temperature. N is a user selectable coefficient, in the range 1 to 8, designated ZN1-2:ZN1-0 for
Zone 1 and ZN2-2:ZN2-0 for Zone 2.
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