參數(shù)資料
型號: FMS2704T1C
廠商: FAIRCHILD SEMICONDUCTOR CORP
元件分類: 模擬信號調(diào)理
英文描述: SPECIALTY ANALOG CIRCUIT, PDSO24
封裝: TSSOP-24
文件頁數(shù): 19/39頁
文件大?。?/td> 173K
代理商: FMS2704T1C
PRODUCT SPECIFICATION
FMS2704/FMS2704L
26
REV. 1.01 12/2/99
Figure 11. Reset Generator Waveforms
tRST
200mS
tDSTBY
200mS
tDIR
VCC3<2.9
STANDBY
RS T
INTRST
In the standby mode power is minimized by stopping all sens-
ing activities and freezing the tachometer, temperature and
voltage register values. When power is initially applied, the
Reset Generator instigates ve events through internal reset,
INTRST:
1.
Conguration, Interrupt and Mask registers are reset to
default values.
2.
THERM Trip Point registers: PTL7-0, PTR7-0, FTL7-0,
FTR7-0 are set to default values.
3.
SPEEDA7-0 and SPEEDB7-0 registers are set to 0x00.
4.
Temperature Processor and Data Processor are reset.
5.
Fan Speed Controller is disengaged with output set to zero.
Fan Speed Controllers
If the FAN_CTRL bit is set H, D/A converter fan drive volt-
ages are established as a function of FMS2704 sensor inputs.
If the FAN_CTRL bit is set L, the Controller does not inu-
ence the D/A register values, which are set through the Serial
Bus. There are two identical channels, A and B that can be set
up independently to control the A and B fan banks. Figure 12
shows both controllers and the details of the A controller.
Figure 12. Fan Speed Controller
DACA
DACB
TR17-0
TR27-0
TL7-0
FAN_SPDA
FAN_SPDB
SPEEDA
REGISTER
SPEEDB
REGISTER
Part of Data Processor
+
Channel B
Controller
PWMA
PWMB
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