Rainbow-electronics DS1780 Bedienungsanleitung PDF herunterladen (Seite 8)

DS1780

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DS1780 MONITORING ORDER Table 3

TEMPERATURE READING

ANALOG +2.5 V

CCP2

ANALOG +12V

ANALOG +5V

ANALOG +3.3V

ANALOG +2.5V

ANALOG +V

CCP1

FAN1

FAN2

If conversions are terminated by either of the methods described in the “OPERATION - Configuration

Monitoring will then terminate. When the monitoring again commences, monitoring always starts with

the temperature reading.

OPERATION - Temperature Data Format

The DS1780 internally converts measured temperature data to a two’s complement data format (in °C).

The host can read the last completed temperature conversion at any time by setting the Internal Address

below in Table 4. The MSb of the register represents the sign bit of the temperature reading. For

Fahrenheit usage, a lookup table or conversion routine must be used.

TEMPERATURE/DATA RELATIONSHIPS Table 4

MSb (unit = °C) LSb

TEMPERATURE

DIGITAL OUTPUT

(BINARY)

DIGITAL OUTPUT (HEX)

+125°C 0111 1101 7Dh

+25°C 0001 1001 19h

+1°C 0000 0001 01h

0°C 0000 0000 00h

-1°C 1111 1111 FFh

-25°C 1110 0111 E7h

-40°C 1101 1000 D8h

OPERATION - Voltage Data Format

The DS1780 contains inputs for directly monitoring the power supplies typically found in a PC (+12V, -

12V, +5V, +3.3V, +2.5V, +V

CCP

). These inputs are scaled internally to a reference source, and converted

via an 8-bit Delta-Sigma ADC (Analog-to-Digital Converter), thus allowing for a more accurate means of

measurement since the voltages are referenced to a known value.

Since these inputs can be greater than V

, they are not diode protected to the power rails. In addition,

small external series resistors such as 510Ω should be put into the lines driving the DS1780 to prevent

damaging the traces or power supplies should an accidental short connect two power supplies together.

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