Rainbow-electronics MAX6678 Manual de usuario descargar pdf (Pagina 12)

MAX6678

OOTT

Status (05h)

Read the OT status register to determine which channel

recorded an overtemperature condition. Bit D7 is high if

the fault reading occurred from channel 1. Bit D6 is

high if the fault reading occurred in channel 2. The OT

status register is cleared only by reading its contents.

After reading the OT status register, a temperature reg-

ister read must be done. Reading the contents of the

the fault is still present on the next temperature mea-

surement cycle, the corresponding bits and the OT out-

put are set again. The POR state of the OT status regis-

ter is 00h.

OOTT

Mask (06h)

Set bit D7 to 1 in the OT mask register to prevent the

OT output from asserting on faults in channel 1. Set bit

D6 to 1 to prevent the OT output from asserting on

faults in channel 2. The POR state of the OT mask reg-

ister is 00h.

2-Channel Temperature Monitor with Dual Automatic

PWM Fan-Speed Controller and Five GPIOs

12 ______________________________________________________________________________________

Table 2. Register Map (continued)

READ/

WRITE

NO.

/ADDRESS

POR

STATE

FUNCTION D7 D6 D5 D4 D3 D2 D1 D0

R 0Eh 0000 000x

PWMOUT2

instantaneous

duty cycle

MSB

(128/240)

—————

LSB

(2/240)

—

R/W 0Fh 0000 0000

Temperature

channel 1 fan-

start temperature

MSB — — ————LSB

R/W 10h 0000 0000

Temperature

channel 2 fan-

start temperature

MSB — — ————LSB

R/W 11h 0000 000x

Fan

configuration

Hys ter esi s:

0 = 5°C,

1 = 10°C

Temp

step: 0 =

1°C,

1 = 2°C

PWMOUT

1 control:

1 =

channel1

PWMOUT

1 control:

1 =

channel 2

PWMOUT

2 control:

1 =

channel 1

PWMOUT

2 control:

1 =

channel 2

——

R/W 12h 1011 01xx

Duty-cycle rate

of change

PWMOUT

1 MSB

—

PWMOUT

1 LSB

PWMOUT

2 MSB

—

PWMOUT

2 LSB

——

R/W 13h 0101 0101

Duty-cycle step

size

PWMOUT

1 MSB

——

PWMOUT

1 LSB

PWMOUT

2 MSB

——

PWMOUT

2 LSB

R/W 14h 010x xxxx

PWM frequency

select

Select A Select B Select C — — — — —

R/W 15h xxx0 0000 GPIO function — — —

GPIO4: 0

= output,

1 = input

GPIO3: 0

= output,

1 = input

GPIO2: 0

= output,

1 = input

GPIO1: 0

= output,

1 = input

GPIO0: 0

= output,

1 = input

R/W 16h xxx*** GPIO value — — — GPIO4 GPIO3 GPIO2 GPIO1 GPIO0

R FDh 0000 0001

Read device

revision

00000001

R FEh 1000 0110 Read device ID 1 0 0 0 0 1 1 0

R FFh 0100 1101

Read

manufacturer ID

01001101

***GPIO0 through GPIO4 POR values set by Preset0 through Preset4.

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 18 19

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Rainbow-electronics MAX6678 Manual de usuario Pagina 12

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