DS1780 Datasheet, PDF (1/28 Pages) Dallas Semiconductor – CPU Peripheral Monitor

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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 ≤ V_DD ≤
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
1
A1 2
SDA 3
SCL 4
FAN1 5
FAN2 6
CHS 7
GNDD 8
VDD
9
INT 10
VOUT/NTIN
11
RST 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/NT_OUT
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
V_DD
- Power Supply Voltage (2.8V
to 5.75V)
INT
- Hardware Interrupt output
V_OUT/NT_IN
- DAC output / NAND TREE
Input
RST
- Remote System Reset
GNDA
- Analog Ground
+xxV_IN
+2.5V_S/+V_CCP2
- Positive Voltage Inputs
- Positive/negative Voltage
Input
VIDx
- Processor Voltage Supply
Readout Inputs
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