參數(shù)資料
型號： ASC7512
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)： 17/35頁
文件大?。?/td> 337K
代理商： ASC7512
- 17 -
Andigilog, Inc. 2006
www.andigilog.com
August 2006 - 70A05003
aSC7512
Bit
Name
R/W
Default
Description
0:1
RES
R
0
Reserved
2
FAN STALLED
R
0
The aSC7512 automatically sets this bit to 1 when the TACH1 input reading is
above the count value set in the Tach1 Minimum MSB and LSB registers.
5:3
RES
R
0
Reserved
6
Remote Diode
Fault
R
0
The aSC7512 automatically sets this bit to 1 when there is an open circuit fault
on the Remote1+ or Remote1- thermal diode input pins. A diode fault will also
set bit 4 Diode 1 Zone Limit bit, of Interrupt Status Register 1.
7
RES
R
0
Reserved
Table 7 Interrupt Status Register 2
Tachometer Measurement and Configuration
Register 28-29h: Fan Tachometer Reading
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
28h
29h
R
R
Tach LSB
Tach MSB
7
15
6
14
5
13
4
12
3
11
2
10
1
9
0
8
N/A
N/A
The Fan Tachometer Reading registers contains the number of 11.111
μ
s periods (90 kHz) between full fan revolutions. The
results are based on the time interval of two tachometer pulses, since most fans produce two tachometer pulses per full
revolution. These registers will be updated at least once every second.
The value, for each fan, is represented by a 16-bit unsigned number.
The Fan Tachometer Reading registers will always return an accurate fan tachometer measurement, even when a fan is
disabled or non-functional, however, if PWM command (register 30h) is zero, tach measurements are suspended and the
last reading may remain in the register.
FF FFh indicates that the fan is not spinning, or that the tachometer input is not connected to a valid signal. These registers
are read-only – a write to these registers has no effect.
When the LSByte of the aSC7512 16-bit register is read, the other byte (MSByte) is latched at the current value until it is
read. At the end of the MSByte read the Fan Tachometer Reading registers are updated. During spin-up, the PWM duty
cycle reported is 0%.
Register 3Ah: Fan Tachometer Measurement Configuration
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
3Ah
R/W
Tach1
Configuration
Tach1
Disable
3-Wire
Enable
Meas
Blank 1
Meas
Blank 0
Meas
Dwell 1
Meas
Dwell 0
Meas
Duration
1
Meas
Duration
0
36
The Fan Tachometer Configuration registers contain the settings that define the modes of measurement of the Tachometer
input signal. The user is allowed to disable a tachometer measurement or to request PWM stretching, in the case of a 3-wire
fan. Also, the rate, start-up and period of measurements within a fan rotation cycle may be selected. The table below
describes the controls.
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