Rainbow-electronics DS1780 Bedienungsanleitung

1 of 28 111999FEATURES Direct-to-digital temperature sensor requiresno external components or user calibration Two fan speed sensors Monitors 6

DS178010 of 28VMIN (VREF, R1, R2) ≅ - 12RR VREFVMAX (VREF, R1, R2) ≅ VREF-(VREF-3.6) úùêëé+121RRRIf the +2.5VS/+VCCP2 is to be used to monitor a secon

DS178011 of 28maximum possible input up to VDD for best noise immunity. Alternatively, use a shunt reference or Zenerdiode to clamp the input level.Ta

DS178012 of 28OPERATION - InterruptsAn external interrupt can come from the following sources. While the label suggests a specific type orsource of in

DS178013 of 281. One-time Interrupt mode: Exceeding hot temperature limit causes an SMI that will remain activeindefinitely until reset by reading In

DS178014 of 28TEMPERATURE INTERRUPT MODE ILLUSTRATION Figure 4SAMPLE CHASSIS INTRUSION DETECTOR/LATCH Figure 5

DS178015 of 28OPERATION - Analog OutputThe DS1780 has a single analog output from a unsigned 8-bit D/A which produces 0-1.25 volts; this isamplified a

DS178016 of 28Note: To properly implement the NAND TREE test on the PCB, no pins listed in the tree should beconnected directly to power or ground; if

DS178017 of 28CONFIGURATION REGISTER (ADDRESS 0X40; POWER-UP DEFAULT = 08h)Table 10.2BIT NAME R/W DESCRIPTION0 START R/WLogic 1 enables startup of mea

DS178018 of 28INTERRUPT INT STATUS REGISTER 2 (ADDRESS 0X42; POWER-UPDEFAULT=00h) Table 10.4BIT NAME R/W DESCRIPTION0 +12V_Error R A 1 indicates a Hig

DS178019 of 28RESERVED REGISTER (ADDRESS 0X45; POWER-UP DEFAULT=00h)Table 10.7BIT NAME R/W DESCRIPTION<7:0>RESERVED R/W Undefined (Power On = 00

DS17802 of 28DESCRIPTIONThe DS1780 is a highly integrated system instrumentation monitor ideal for use in personal computers, orany microprocessor-bas

DS178020 of 28TEMPERATURE CONFIGURATION REGISTER (ADDRESS Ox4B; POWER-UPDEFAULT = 01h) Table 10.12BIT NAME R/W DESCRIPTION0HotTemperatureInterruptmode

DS178021 of 28VALUE RAM (ADDRESS 0x15h - 0x3Dh) Table 10.15ADDRESS <A7:A0>h R/W DESCRIPTION20h R +2.5V Input Reading.21h R VCCP1 Input Reading.2

DS178022 of 284. This register will latch an 8-bit value into an R-2R D/A to provide a range of 0-1.25 volts; accuracycan be ±5% or more.5. This loc

DS178023 of 28DC ELECTRICAL CHARACTERISTICSPower Supply (-40°C to +125°C, 2.8V ≤ VDD ≤ 5.75V)PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS NOTESActive

DS178024 of 28DC ELECTRICAL CHARACTERISTICS:Fan RPM-to-Digital Converter (-40°C to +125°C, 2.8V ≤ VDD ≤ 5.75V)PARAMETER SYMBOL CONDITION MIN TYP MAX U

DS178025 of 28DC ELECTRICAL CHARACTERISTICS:Open-drain Digital Outputs: RST, CHS, INT(-40°C to +125°C, 2.8V ≤ VDD ≤ 5.75V)PARAMETER SYMBOL CONDITION M

DS178026 of 28DC ELECTRICAL CHARACTERISTICS:All Digital Inputs (-40°C to +125°C, 2.8V ≤ VDD ≤ 5.75V)PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS NOTES

DS178027 of 282-WIRE BUS TIMING DIAGRAM Figure 8NOTES:1. All voltages are referenced to ground, unless otherwise specified.2. When the input voltage

DS178028 of 28DS1780 24 LD. TSSOPDIM MIN MAXA- 1.10A10.05 -A20.75 1.05c0.09 0.18phi0° 8°L0.50 0.70e10.65 BSCB0.18 0.30D7.55 8.00E4.40 NOMG0.25 REFH6.2

DS17803 of 28OVERVIEWA block diagram of the DS1780 is shown in Figure 1.The DS1780 provides six analog inputs, an analog output, five digital inputs,

DS17804 of 28A CHS (Chassis Intrusion) digital input is provided. The Chassis Intrusion input is designed to accept anactive high signal from an exter

DS17805 of 28INTERNAL ADDRESS REGISTER MAP Table 2REGISTERDS1780 INTERNALHEX ADDRESSPOWER ON VALUE NOTESConfiguration Register 40h 0000 1000Interrupt

DS17806 of 282-WIRE SERIAL COMMUNICATION WITH THE DS1780 Figure 2OPERATION - Power-onApplying power to the DS1780 causes a reset of several of the reg

DS17807 of 28Software Reset - This condition is generated by writing a 1 to bit 4 of the configuration register. It has noeffect on DS1780 register co

DS17808 of 28DS1780 MONITORING ORDER Table 3TEMPERATURE READINGANALOG +2.5 VS/VCCP2ANALOG +12VANALOG +5VANALOG +3.3VANALOG +2.5VANALOG +VCCP1FAN1FAN2I

DS17809 of 28The worse such accident would be connecting -12V to +12V; a total of 24V difference, with the seriesresistors this would draw a maximum o