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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 ￡ 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/NT OUT 1 24 VID0
A1 2 23 VID
SDA 3 22 VID2
SCL 4 21 VID3
FAN1 5 20 VID4
FAN2 6 19 +V CCP1
CHS 7 18 +2.5 V IN
GNDD 8 17 +3.3 V IN
V DD 9 16 +5 V IN
INT 10 15 +12 V IN
V OUT /NT IN 11 14 +2.5 V S /+V CCP2
RST 12 13 GNDA
DS1780E+
24-Pin TSSOP (173-mil)
PIN DESCRIPTION
A0/NT OUT - Address Input / NAND
TREE 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
V DD
INT
V OUT /NT IN
RST
GNDA
+xxV IN
+2.5V S /+V CCP2
VIDx
- 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
See Table 11 on page 27 for Ordering Information
1 of 28
032305
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