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PDF DS1780 Data sheet ( Hoja de datos )
| Número de pieza | DS1780 | |
| Descripción | CPU Peripheral Monitor | |
| Fabricantes | Dallas | |
| Logotipo |  |
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DS1780
CPU Peripheral Monitor
FEATURES
Direct-to-digital temperature sensor requires
no external components or user calibration
Two fan speed sensors
Monitors 6 power supply voltages
8-bit DAC for fan speed control
Intrusion detect for security (detects when
chassis lid has been removed, even if power is
off)
Remote system reset
System interrupt availability on all monitored
functions (temperature, voltages, fan speed,
chassis intrusion)
2-wire interface with 2-bit addressability
Integrated NAND TREE for board level
testability
Wide power supply range (2.8V ≤ VDD ≤
5.75V)
High integration in a small 24-pin 173-mil
TSSOP
Applications include monitoring of personal
computers or any microprocessor-based
system
PIN ASSIGNMENT
A0/NTOUT
A1
SDA
SCL
FAN1
FAN2
CHS
GNDD
VDD
INT
VOUT/NTIN
RST
1
2
3
4
5
6
7
8
9
10
11
12
24 VID0
23 VID
22 VID2
21 VID3
20 VID4
19 +VCCP1
18 +2.5 VIN
17 +3.3 VIN
16 +5 VIN
15 +12 VIN
14 +2.5 VS/+VCCP2
13 GNDA
DS1780E
24-Pin TSSOP (173-mil)
PIN DESCRIPTION
A0/NTOUT
TREE
- Address Input / NAND
Output
A1 - Address Input
SDA
- 2-Wire Serial Data
Input/Output
SCL - 2-Wire Serial Clock
FANx
- Tachometer Inputs
CHS - Chassis Intrusion Detector
Input
GNDD
- Digital Ground
VDD - Power Supply Voltage (2.8V
to 5.75V)
INT - Hardware Interrupt output
VOUT/NTIN
- DAC output / NAND TREE
Input
RST - Remote System Reset
GNDA
- Analog Ground
+xxVIN
+2.5VS/+VCCP2
- Positive Voltage Inputs
- Positive/negative Voltage
Input
VIDx
- Processor Voltage Supply
Readout Inputs
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111999
1 page  
INTERNAL ADDRESS REGISTER MAP Table 2
REGISTER
Configuration Register
DS1780 INTERNAL
HEX ADDRESS
40h
POWER ON VALUE
0000 1000
Interrupt (INT) Status
Register 1
41h
0000 0000
Interrupt (INT) Status
Register 2
Interrupt (INT) Mask
Register 1
Interrupt (INT) Mask
Register 2
42h
43h
44h
0000 0000
0000 0000
0000 0000
Chassis Intrusion Clear
Register
46h
0000 0000
VID Register
Serial Address Register
VID4 Register
Temperature
Configuration
Register
Test Register
Analog output
Value RAM
Company ID
Stepping
47h
48h
49h
4Bh
15h
19h
20h-3Dh
3Eh
3Fh
0101 XXXX
0010 11XY
1000 000X
0000 0001
0000 0000
1111 1111
1101 1010
0000 0001
DS1780
NOTES
Bit 7 of this register
clears Chassis Intrusion.
The other bits are
reserved.
The lower 4 bits reflect
the state of
VID0-VID3 pins.
X Reflects state of A1
and Y Reflects A0 state
Bit 0 = VID 4. The rest
are reserved.
Do not alter the
contents of the register.
Full on
Read only
Read only
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5 Page 
DS1780
maximum possible input up to VDD for best noise immunity. Alternatively, use a shunt reference or Zener
diode to clamp the input level.
Tables 7 and 8 describe the format of the data stored in the FAN reading registers (Internal Address
Registers 28h and 29h).
FAN TACHOMETER INPUT OPTIONS Figure 3
VOLTAGE/DATA RELATIONSHIPS FOR FAN INPUTS (FAN1, FAN2) UNDER
DEFAULT (÷2) MODE Table 7
RPM
4400
3080
2640
Timer Per Revolution
13.64 ms
19.48 ms
22.73 ms
Counts for “Divide by 2” (default mode) in decimal
153
219
255 (maximum)
Comments
Typical RPM
70% RPM
60% RPM
VOLTAGE/DATA RELATIONSHIPS FOR FAN INPUTS (FAN1, FAN 2) Table 8
MODE
SELECT
Divide by 1
Divide by 2
Divide by 4
Divide by 8
NOMINAL
RPM
8800
4400
2200
1100
TIME PER
REVOLUTION
6.82 ms
13.64 ms
27.27 ms
54.54 ms
COUNTS FOR THE
NOMINAL
SPEED IN DECIMAL
153
153
153
153
70% RPM
6160
3080
1540
770
TIME PER
REVOLUTION FOR
70% RPM
9.74 ms
19.48 ms
38.96 ms
77.92 ms
In general, the value stored in the FAN registers (in decimal) follows the equation:
Count (RPM, Divisor) ≅
1.35 x 106
RPM Divisor
If fans can be powered while the power to the DS1780 is off, the DS1780 inputs will provide diode
clamping. Limit input current to the Input Current at Any Pin specification shown in the ABSOLUTE
MAXIMUM RATINGS section. In most cases, open collector outputs with pullup resistors inherently
limit this current. If this maximum current could be exceeded, either a larger pullup resistor should be
used or resistors connected in series with the fan inputs.
The Fan Inputs gate an internal 22.5 kHz oscillator for one period of the Fan signal into an 8-bit counter
(maximum count = 255). The default divisor, located in the Fan Divisor/RST_Register, is set to 2
(choices are 1, 2, 4, and 8) providing a nominal count of 153 for a 4400 rpm fan with two pulses per
revolution. Typical practice is to consider 70% of normal RPM a fan failure, at which point the count will
be 219.
11 of 28
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| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet DS1780.PDF ] | |
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