參數(shù)資料
型號(hào)： FMS2704LT1C
廠商： FAIRCHILD SEMICONDUCTOR CORP
元件分類： 模擬信號(hào)調(diào)理
英文描述： SPECIALTY ANALOG CIRCUIT, PDSO24
封裝： TSSOP-24
文件頁數(shù)： 35/39頁
文件大?。?/td> 173K
代理商： FMS2704LT1C
FMS2704/FMS2704L
PRODUCT SPECIFICATION
REV. 1.01 12/2/99
5
Addressable Memory
Serial Port (3)
SDA
5
Bi-directional
Data. Serial Bus data to/from FMS2704
SCL
6
Input
Clock. Serial Bus clock into FMS2704
ADD
9
3-level
Address Select Pins. Serial Port address select corresponding to
H, L and Z levels.
Digital Inputs/Outputs (6)
TACHB2,
TACHA2,
TACHB1,
TACHA1
20, 21,
22, 23
Input
Fan Tachometer 4-1 Inputs. One,two, four or eight pulses per
revolution. Three tachometers inputs per bank of fans, A or B.
10K
pull-up.
THERM
4
I/O (Open drain) Thermal Overload. Output THERM = L indicates that a temperature
trip point has been exceeded. Input THERM = L sets the THERM bit
in the Interrupt Status Register.
INT
8
Open drain
Interrupt Output. INT = L when a voltage, temperature limit or
temperature trip point is violated and bit 1 of the Configuration
Register is set H.
Reset (3)
RST
3
Output
Reset. Output from Main Reset Generator, which is tripped by
STANDBY = L or VCC < 2.9/4.4 volt.
STANDBY
24
Input
Standby Mode. Forces the Standby Mode with interrupts disabled
and register read backs frozen. Initiates a master reset cycle.
Current is minimized by powering down: D/A converters, A/D
converters, serial bus ADD detection. The STANDBY pin should
biased to VCC through a 20K
pull-up resistor.
Power and Ground (2)
VCCD
7
+3.3/5V
Digital Supply Voltage.
VCCA
19
+3.3/5V
Analog Supply Voltage.
GND
12
0 V
Ground. Return for VCC supply.
FMS2704 Memory Map
Name
Address (hex)
POR[7:0] (hex)
Thermometer
PTL7-0
0x13
0x46
70°C
PTR7-0
0x14
0x64
100°C
SPEEDA7-0
0x16
0x00
FTL7-0
0x17
0x46
70°C
FTR7-0
0x18
0x64
100°C
SPEEDB7-0
0x19
0x00
TR27-0
0x20
0x16
22°C
TR17-0
0x21
0x15
21°C
TL7-0
0x22
0x14
20°C
TR2HI7-0
0x23
0x20
32°C
TR2LO7-0
0x24
0x02
02°C
Pin Descriptions (continued)
Pin Name
Pin No.
Type/Value
Pin Function Description
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