Rainbow-electronics LM85 Instrukcja Użytkownika Pobierz pdf (Strona 10)

Functional Description (Continued)

Address

Read/

Write

Name

Bit 7

(MSB)

Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

(LSB)

Default

Value

Lock?

6Fh R/W XOR Test Tree Enable RES RES RES RES RES RES RES XEN 00h U

74h R/W Tach Monitor Mode RES RES T3/4-1 T3/4-0 T2-1 T2-0 T1-1 T1-0 00h

75h R/W Fan Spin-up Mode RES RES RES RES RES PWM3

PWM2

PWM1

7h U

Note: Reserved bits will always return 0 when read.

4.1 Register 20-24h: Voltage Reading

Address

Read/

Write

Name

Bit 7

(MSB)

Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

(LSB)

Default

Value

20h R 2.5V 7 6543210 N/A

21h R V

CCP

7 6543210 N/A

22h R 3.3V 7 6543210 N/A

23h R 5V 7 6543210 N/A

24h R 12V 7 6543210 N/A

The Register Names difine the typical input voltage at which the reading is

⁄

full scale or C0h.

The Voltage Reading registers are updated automatically by the LM85 at a minimum frequency of 4 Hz. These registers are read

only — a write to these registers has no effect.

4.2 Register 25-27h: Temperature Reading

Address

Read/

Write

Name

Bit 7

(MSB)

Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

(LSB)

Default

Value

25h R Processor (Zone1) Temp 7 6543210 N/A

26h R Internal (Zone2) Temp 7 6543210 N/A

27h R Remote (Zone3) Temp 7 6543210 N/A

The Temperature Reading registers reflect the current temperatures of the internal and remote diodes. Processor (Zone1) Temp

(Zone3) Temp register reports the temperature measured by the thermal diode connected to the the Remote2− and Remote2+

pins, and the Internal (Zone2) Temp register reports the temperature measured by the internal (junction) temperature sensor.

Temperatures are represented as 8 bit, 2’s complement, signed numbers, in Celsius, as shown below in Table 1. The Temperature

Reading register will return a value of 80h if the remote diode pins are not used by the board designer or are not functioning

properly. This reading will cause the zone limit bit(s) (bits 6 and 4) in the Interrupt Status Register (41h) and the remote diode fault

status bit(s) (bit 6 or 7) in the Interrupt Status Register 2 (42h) to be set. The Temperature Reading registers are updated

automatically by the LM85 at a minimum frequency of 4 Hz. These registers are read only — a write to these registers has no

effect.

TABLE 1. Temperature vs Register Reading

Temperature Reading (Dec) Reading (Hex)

−127˚C −127 81h

−50˚C −50 CEh

0˚C 0 00h

127˚C 127 7Fh

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