DS1780
CPU Peripheral Monitor
www.dalsemi.com
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
鈮?/div>
V
DD
鈮?/div>
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/NT
OUT
A1
SDA
SCL
FAN1
FAN2
CHS
GNDD
V
DD
INT
V
OUT
/NT
IN
RST
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
VID0
VID
VID2
VID3
VID4
+V
CCP1
+2.5 V
IN
+3.3 V
IN
+5 V
IN
+12 V
IN
+2.5 V
S
/+V
CCP2
GNDA
DS1780E
24-Pin TSSOP (173-mil)
PIN DESCRIPTION
A0/NT
OUT
TREE
A1
SDA
SCL
FANx
CHS
GNDD
V
DD
INT
V
OUT
/NT
IN
RST
GNDA
+xxV
IN
+2.5V
S
/+V
CCP2
VIDx
- Address Input / NAND
Output
- Address Input
- 2-Wire Serial Data
Input/Output
- 2-Wire Serial Clock
- Tachometer Inputs
- Chassis Intrusion Detector
Input
- Digital Ground
- Power Supply Voltage (2.8V
to 5.75V)
- Hardware Interrupt output
- DAC output / NAND TREE
Input
- Remote System Reset
- Analog Ground
- Positive Voltage Inputs
- Positive/negative Voltage
Input
- Processor Voltage Supply
Readout Inputs
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